diff --git a/assignment-client/src/Agent.cpp b/assignment-client/src/Agent.cpp
index 300976f81c..fda226b934 100644
--- a/assignment-client/src/Agent.cpp
+++ b/assignment-client/src/Agent.cpp
@@ -41,10 +41,6 @@ Agent::Agent(NLPacket& packet) :
         DEFAULT_WINDOW_STARVE_THRESHOLD, DEFAULT_WINDOW_SECONDS_FOR_DESIRED_CALC_ON_TOO_MANY_STARVES,
         DEFAULT_WINDOW_SECONDS_FOR_DESIRED_REDUCTION, false))
 {
-    // be the parent of the script engine so it gets moved when we do
-    _scriptEngine.setParent(this);
-    _scriptEngine.setIsAgent(true);
-    
     DependencyManager::get<EntityScriptingInterface>()->setPacketSender(&_entityEditSender);
 
     DependencyManager::set<ResourceCacheSharedItems>();
@@ -157,8 +153,11 @@ void Agent::run() {
 
     qDebug() << "Downloaded script:" << scriptContents;
 
+    _scriptEngine = new ScriptEngine(scriptContents, _payload);
+    _scriptEngine->setParent(this); // be the parent of the script engine so it gets moved when we do
+
     // setup an Avatar for the script to use
-    ScriptableAvatar scriptedAvatar(&_scriptEngine);
+    ScriptableAvatar scriptedAvatar(_scriptEngine);
     scriptedAvatar.setForceFaceTrackerConnected(true);
 
     // call model URL setters with empty URLs so our avatar, if user, will have the default models
@@ -166,12 +165,11 @@ void Agent::run() {
     scriptedAvatar.setSkeletonModelURL(QUrl());
 
     // give this AvatarData object to the script engine
-    _scriptEngine.setAvatarData(&scriptedAvatar, "Avatar");
+    setAvatarData(&scriptedAvatar, "Avatar");
     
     auto avatarHashMap = DependencyManager::set<AvatarHashMap>();
-   
-    _scriptEngine.setAvatarHashMap(avatarHashMap.data(), "AvatarList");
-    
+    _scriptEngine->registerGlobalObject("AvatarList", avatarHashMap.data());
+
     auto& packetReceiver = DependencyManager::get<NodeList>()->getPacketReceiver();
     packetReceiver.registerListener(PacketType::BulkAvatarData, avatarHashMap.data(), "processAvatarDataPacket");
     packetReceiver.registerListener(PacketType::KillAvatar, avatarHashMap.data(), "processKillAvatar");
@@ -179,33 +177,188 @@ void Agent::run() {
     packetReceiver.registerListener(PacketType::AvatarBillboard, avatarHashMap.data(), "processAvatarBillboardPacket");
 
     // register ourselves to the script engine
-    _scriptEngine.registerGlobalObject("Agent", this);
+    _scriptEngine->registerGlobalObject("Agent", this);
 
-    if (!_payload.isEmpty()) {
-        _scriptEngine.setParentURL(_payload);
-    }
+    // FIXME -we shouldn't be calling this directly, it's normally called by run(), not sure why 
+    // viewers would need this called.
+    //_scriptEngine->init(); // must be done before we set up the viewers
 
-    _scriptEngine.init(); // must be done before we set up the viewers
+    _scriptEngine->registerGlobalObject("SoundCache", DependencyManager::get<SoundCache>().data());
 
-    _scriptEngine.registerGlobalObject("SoundCache", DependencyManager::get<SoundCache>().data());
-
-    QScriptValue webSocketServerConstructorValue = _scriptEngine.newFunction(WebSocketServerClass::constructor);
-    _scriptEngine.globalObject().setProperty("WebSocketServer", webSocketServerConstructorValue);
+    QScriptValue webSocketServerConstructorValue = _scriptEngine->newFunction(WebSocketServerClass::constructor);
+    _scriptEngine->globalObject().setProperty("WebSocketServer", webSocketServerConstructorValue);
 
     auto entityScriptingInterface = DependencyManager::get<EntityScriptingInterface>();
 
-    _scriptEngine.registerGlobalObject("EntityViewer", &_entityViewer);
+    _scriptEngine->registerGlobalObject("EntityViewer", &_entityViewer);
     _entityViewer.setJurisdictionListener(entityScriptingInterface->getJurisdictionListener());
     _entityViewer.init();
     entityScriptingInterface->setEntityTree(_entityViewer.getTree());
 
-    _scriptEngine.setScriptContents(scriptContents);
-    _scriptEngine.run();
+    // wire up our additional agent related processing to the update signal
+    QObject::connect(_scriptEngine, &ScriptEngine::update, this, &Agent::processAgentAvatarAndAudio);
+
+    _scriptEngine->run();
     setFinished(true);
+
+    // kill the avatar identity timer
+    delete _avatarIdentityTimer;
+
+    // delete the script engine
+    delete _scriptEngine;
+
+}
+
+void Agent::setIsAvatar(bool isAvatar) {
+    _isAvatar = isAvatar;
+
+    if (_isAvatar && !_avatarIdentityTimer) {
+        // set up the avatar timers
+        _avatarIdentityTimer = new QTimer(this);
+        _avatarBillboardTimer = new QTimer(this);
+
+        // connect our slot
+        connect(_avatarIdentityTimer, &QTimer::timeout, this, &Agent::sendAvatarIdentityPacket);
+        connect(_avatarBillboardTimer, &QTimer::timeout, this, &Agent::sendAvatarBillboardPacket);
+
+        // start the timers
+        _avatarIdentityTimer->start(AVATAR_IDENTITY_PACKET_SEND_INTERVAL_MSECS);
+        _avatarBillboardTimer->start(AVATAR_BILLBOARD_PACKET_SEND_INTERVAL_MSECS);
+    }
+
+    if (!_isAvatar) {
+        delete _avatarIdentityTimer;
+        _avatarIdentityTimer = NULL;
+        delete _avatarBillboardTimer;
+        _avatarBillboardTimer = NULL;
+    }
+}
+
+void Agent::setAvatarData(AvatarData* avatarData, const QString& objectName) {
+    _avatarData = avatarData;
+    _scriptEngine->registerGlobalObject(objectName, avatarData);
+}
+
+void Agent::sendAvatarIdentityPacket() {
+    if (_isAvatar && _avatarData) {
+        _avatarData->sendIdentityPacket();
+    }
+}
+
+void Agent::sendAvatarBillboardPacket() {
+    if (_isAvatar && _avatarData) {
+        _avatarData->sendBillboardPacket();
+    }
+}
+
+
+void Agent::processAgentAvatarAndAudio(float deltaTime) {
+    if (!_scriptEngine->isFinished() && _isAvatar && _avatarData) {
+
+        const int SCRIPT_AUDIO_BUFFER_SAMPLES = floor(((SCRIPT_DATA_CALLBACK_USECS * AudioConstants::SAMPLE_RATE)
+            / (1000 * 1000)) + 0.5);
+        const int SCRIPT_AUDIO_BUFFER_BYTES = SCRIPT_AUDIO_BUFFER_SAMPLES * sizeof(int16_t);
+
+        QByteArray avatarByteArray = _avatarData->toByteArray(true, randFloat() < AVATAR_SEND_FULL_UPDATE_RATIO);
+        _avatarData->doneEncoding(true);
+        auto avatarPacket = NLPacket::create(PacketType::AvatarData, avatarByteArray.size());
+
+        avatarPacket->write(avatarByteArray);
+
+        auto nodeList = DependencyManager::get<NodeList>();
+
+        nodeList->broadcastToNodes(std::move(avatarPacket), NodeSet() << NodeType::AvatarMixer);
+
+        if (_isListeningToAudioStream || _avatarSound) {
+            // if we have an avatar audio stream then send it out to our audio-mixer
+            bool silentFrame = true;
+
+            int16_t numAvailableSamples = SCRIPT_AUDIO_BUFFER_SAMPLES;
+            const int16_t* nextSoundOutput = NULL;
+
+            if (_avatarSound) {
+
+                const QByteArray& soundByteArray = _avatarSound->getByteArray();
+                nextSoundOutput = reinterpret_cast<const int16_t*>(soundByteArray.data()
+                    + _numAvatarSoundSentBytes);
+
+                int numAvailableBytes = (soundByteArray.size() - _numAvatarSoundSentBytes) > SCRIPT_AUDIO_BUFFER_BYTES
+                    ? SCRIPT_AUDIO_BUFFER_BYTES
+                    : soundByteArray.size() - _numAvatarSoundSentBytes;
+                numAvailableSamples = numAvailableBytes / sizeof(int16_t);
+
+
+                // check if the all of the _numAvatarAudioBufferSamples to be sent are silence
+                for (int i = 0; i < numAvailableSamples; ++i) {
+                    if (nextSoundOutput[i] != 0) {
+                        silentFrame = false;
+                        break;
+                    }
+                }
+
+                _numAvatarSoundSentBytes += numAvailableBytes;
+                if (_numAvatarSoundSentBytes == soundByteArray.size()) {
+                    // we're done with this sound object - so set our pointer back to NULL
+                    // and our sent bytes back to zero
+                    _avatarSound = NULL;
+                    _numAvatarSoundSentBytes = 0;
+                }
+            }
+
+            auto audioPacket = NLPacket::create(silentFrame
+                ? PacketType::SilentAudioFrame
+                : PacketType::MicrophoneAudioNoEcho);
+
+            // seek past the sequence number, will be packed when destination node is known
+            audioPacket->seek(sizeof(quint16));
+
+            if (silentFrame) {
+                if (!_isListeningToAudioStream) {
+                    // if we have a silent frame and we're not listening then just send nothing and break out of here
+                    return;
+                }
+
+                // write the number of silent samples so the audio-mixer can uphold timing
+                audioPacket->writePrimitive(SCRIPT_AUDIO_BUFFER_SAMPLES);
+
+                // use the orientation and position of this avatar for the source of this audio
+                audioPacket->writePrimitive(_avatarData->getPosition());
+                glm::quat headOrientation = _avatarData->getHeadOrientation();
+                audioPacket->writePrimitive(headOrientation);
+
+            }else if (nextSoundOutput) {
+                // assume scripted avatar audio is mono and set channel flag to zero
+                audioPacket->writePrimitive((quint8)0);
+
+                // use the orientation and position of this avatar for the source of this audio
+                audioPacket->writePrimitive(_avatarData->getPosition());
+                glm::quat headOrientation = _avatarData->getHeadOrientation();
+                audioPacket->writePrimitive(headOrientation);
+
+                // write the raw audio data
+                audioPacket->write(reinterpret_cast<const char*>(nextSoundOutput), numAvailableSamples * sizeof(int16_t));
+            }
+
+            // write audio packet to AudioMixer nodes
+            auto nodeList = DependencyManager::get<NodeList>();
+            nodeList->eachNode([this, &nodeList, &audioPacket](const SharedNodePointer& node){
+                // only send to nodes of type AudioMixer
+                if (node->getType() == NodeType::AudioMixer) {
+                    // pack sequence number
+                    quint16 sequence = _outgoingScriptAudioSequenceNumbers[node->getUUID()]++;
+                    audioPacket->seek(0);
+                    audioPacket->writePrimitive(sequence);
+
+                    // send audio packet
+                    nodeList->sendUnreliablePacket(*audioPacket, *node);
+                }
+            });
+        }
+    }
 }
 
 void Agent::aboutToFinish() {
-    _scriptEngine.stop();
+    _scriptEngine->stop();
 
     _pingTimer->stop();
     delete _pingTimer;
diff --git a/assignment-client/src/Agent.h b/assignment-client/src/Agent.h
index 4c207e59aa..33a8eb58c2 100644
--- a/assignment-client/src/Agent.h
+++ b/assignment-client/src/Agent.h
@@ -37,37 +37,53 @@ class Agent : public ThreadedAssignment {
 public:
     Agent(NLPacket& packet);
     
-    void setIsAvatar(bool isAvatar) { QMetaObject::invokeMethod(&_scriptEngine, "setIsAvatar", Q_ARG(bool, isAvatar)); }
-    bool isAvatar() const { return _scriptEngine.isAvatar(); }
-    
-    bool isPlayingAvatarSound() const  { return _scriptEngine.isPlayingAvatarSound(); }
-    
-    bool isListeningToAudioStream() const { return _scriptEngine.isListeningToAudioStream(); }
-    void setIsListeningToAudioStream(bool isListeningToAudioStream)
-        { _scriptEngine.setIsListeningToAudioStream(isListeningToAudioStream); }
-    
+    void setIsAvatar(bool isAvatar);
+    bool isAvatar() const { return _isAvatar; }
+
+    bool isPlayingAvatarSound() const { return _avatarSound != NULL; }
+
+    bool isListeningToAudioStream() const { return _isListeningToAudioStream; }
+    void setIsListeningToAudioStream(bool isListeningToAudioStream) { _isListeningToAudioStream = isListeningToAudioStream; }
+
     float getLastReceivedAudioLoudness() const { return _lastReceivedAudioLoudness; }
 
     virtual void aboutToFinish();
     
 public slots:
     void run();
-    void playAvatarSound(Sound* avatarSound) { _scriptEngine.setAvatarSound(avatarSound); }
+    void playAvatarSound(Sound* avatarSound) { setAvatarSound(avatarSound); }
 
 private slots:
     void handleAudioPacket(QSharedPointer<NLPacket> packet);
     void handleOctreePacket(QSharedPointer<NLPacket> packet, SharedNodePointer senderNode);
     void handleJurisdictionPacket(QSharedPointer<NLPacket> packet, SharedNodePointer senderNode);
     void sendPingRequests();
+    void processAgentAvatarAndAudio(float deltaTime);
 
 private:
-    ScriptEngine _scriptEngine;
+    ScriptEngine* _scriptEngine;
     EntityEditPacketSender _entityEditSender;
     EntityTreeHeadlessViewer _entityViewer;
     QTimer* _pingTimer;
     
     MixedAudioStream _receivedAudioStream;
     float _lastReceivedAudioLoudness;
+
+    void setAvatarData(AvatarData* avatarData, const QString& objectName);
+    void setAvatarSound(Sound* avatarSound) { _avatarSound = avatarSound; }
+
+    void sendAvatarIdentityPacket();
+    void sendAvatarBillboardPacket();
+
+    AvatarData* _avatarData = nullptr;
+    bool _isListeningToAudioStream = false;
+    Sound* _avatarSound = nullptr;
+    int _numAvatarSoundSentBytes = 0;
+    bool _isAvatar = false;
+    QTimer* _avatarIdentityTimer = nullptr;
+    QTimer* _avatarBillboardTimer = nullptr;
+    QHash<QUuid, quint16> _outgoingScriptAudioSequenceNumbers;
+
 };
 
 #endif // hifi_Agent_h
diff --git a/assignment-client/src/entities/EntityServer.cpp b/assignment-client/src/entities/EntityServer.cpp
index bde53e4a87..bdd5728246 100644
--- a/assignment-client/src/entities/EntityServer.cpp
+++ b/assignment-client/src/entities/EntityServer.cpp
@@ -142,7 +142,7 @@ void EntityServer::pruneDeletedEntities() {
     }
 }
 
-void EntityServer::readAdditionalConfiguration(const QJsonObject& settingsSectionObject) {
+bool EntityServer::readAdditionalConfiguration(const QJsonObject& settingsSectionObject) {
     bool wantEditLogging = false;
     readOptionBool(QString("wantEditLogging"), settingsSectionObject, wantEditLogging);
     qDebug("wantEditLogging=%s", debug::valueOf(wantEditLogging));
@@ -150,4 +150,6 @@ void EntityServer::readAdditionalConfiguration(const QJsonObject& settingsSectio
 
     EntityTreePointer tree = std::static_pointer_cast<EntityTree>(_tree);
     tree->setWantEditLogging(wantEditLogging);
+
+    return true;
 }
diff --git a/assignment-client/src/entities/EntityServer.h b/assignment-client/src/entities/EntityServer.h
index d2be75d05e..114e0e1726 100644
--- a/assignment-client/src/entities/EntityServer.h
+++ b/assignment-client/src/entities/EntityServer.h
@@ -41,7 +41,7 @@ public:
     virtual int sendSpecialPackets(const SharedNodePointer& node, OctreeQueryNode* queryNode, int& packetsSent);
 
     virtual void entityCreated(const EntityItem& newEntity, const SharedNodePointer& senderNode);
-    virtual void readAdditionalConfiguration(const QJsonObject& settingsSectionObject);
+    virtual bool readAdditionalConfiguration(const QJsonObject& settingsSectionObject) override;
 
 public slots:
     void pruneDeletedEntities();
diff --git a/assignment-client/src/octree/OctreeQueryNode.cpp b/assignment-client/src/octree/OctreeQueryNode.cpp
index c68fb4e1b5..f70ff62f91 100644
--- a/assignment-client/src/octree/OctreeQueryNode.cpp
+++ b/assignment-client/src/octree/OctreeQueryNode.cpp
@@ -242,7 +242,8 @@ bool OctreeQueryNode::updateCurrentViewFrustum() {
 
     if (0.0f != getCameraAspectRatio() &&
         0.0f != getCameraNearClip() &&
-        0.0f != getCameraFarClip()) {
+        0.0f != getCameraFarClip() &&
+        getCameraNearClip() != getCameraFarClip()) {
         newestViewFrustum.setProjection(glm::perspective(
             glm::radians(wideFOV), // hack
             getCameraAspectRatio(),
diff --git a/assignment-client/src/octree/OctreeServer.cpp b/assignment-client/src/octree/OctreeServer.cpp
index 0368e8a408..ee0403d57b 100644
--- a/assignment-client/src/octree/OctreeServer.cpp
+++ b/assignment-client/src/octree/OctreeServer.cpp
@@ -887,7 +887,7 @@ bool OctreeServer::readOptionString(const QString& optionName, const QJsonObject
     return optionAvailable;
 }
 
-void OctreeServer::readConfiguration() {
+bool OctreeServer::readConfiguration() {
     // if the assignment had a payload, read and parse that
     if (getPayload().size() > 0) {
         parsePayload();
@@ -907,8 +907,11 @@ void OctreeServer::readConfiguration() {
     loop.exec();
 
     if (domainHandler.getSettingsObject().isEmpty()) {
-        qDebug() << "No settings object from domain-server.";
+        qDebug() << "Failed to retreive settings object from domain-server. Bailing on assignment.";
+        setFinished(true);
+        return false;
     }
+
     const QJsonObject& settingsObject = domainHandler.getSettingsObject();
     QString settingsKey = getMyDomainSettingsKey();
     QJsonObject settingsSectionObject = settingsObject[settingsKey].toObject();
@@ -1017,7 +1020,7 @@ void OctreeServer::readConfiguration() {
                     packetsPerSecondTotalMax, _packetsTotalPerInterval);
 
 
-    readAdditionalConfiguration(settingsSectionObject);
+    return readAdditionalConfiguration(settingsSectionObject);
 }
 
 void OctreeServer::run() {
@@ -1043,7 +1046,9 @@ void OctreeServer::run() {
     commonInit(getMyLoggingServerTargetName(), getMyNodeType());
 
     // read the configuration from either the payload or the domain server configuration
-    readConfiguration();
+    if (!readConfiguration()) {
+        return; // bailing on run, because readConfiguration failed
+    }
 
     beforeRun(); // after payload has been processed
 
@@ -1333,19 +1338,22 @@ void OctreeServer::sendStatsPacket() {
     QJsonObject statsObject2;
     statsObject2["data"] = dataObject1;
     statsObject2["timing"] = timingArray1;
-    
-    // Stats Object 3
+
     QJsonObject dataArray2;
-    dataArray2["1. packetQueue"] = (double)_octreeInboundPacketProcessor->packetsToProcessCount();
-    dataArray2["2. totalPackets"] = (double)_octreeInboundPacketProcessor->getTotalPacketsProcessed();
-    dataArray2["3. totalElements"] = (double)_octreeInboundPacketProcessor->getTotalElementsProcessed();
-    
     QJsonObject timingArray2;
-    timingArray2["1. avgTransitTimePerPacket"] = (double)_octreeInboundPacketProcessor->getAverageTransitTimePerPacket();
-    timingArray2["2. avgProcessTimePerPacket"] = (double)_octreeInboundPacketProcessor->getAverageProcessTimePerPacket();
-    timingArray2["3. avgLockWaitTimePerPacket"] = (double)_octreeInboundPacketProcessor->getAverageLockWaitTimePerPacket();
-    timingArray2["4. avgProcessTimePerElement"] = (double)_octreeInboundPacketProcessor->getAverageProcessTimePerElement();
-    timingArray2["5. avgLockWaitTimePerElement"] = (double)_octreeInboundPacketProcessor->getAverageLockWaitTimePerElement();
+
+    // Stats Object 3
+    if (_octreeInboundPacketProcessor) {
+        dataArray2["1. packetQueue"] = (double)_octreeInboundPacketProcessor->packetsToProcessCount();
+        dataArray2["2. totalPackets"] = (double)_octreeInboundPacketProcessor->getTotalPacketsProcessed();
+        dataArray2["3. totalElements"] = (double)_octreeInboundPacketProcessor->getTotalElementsProcessed();
+
+        timingArray2["1. avgTransitTimePerPacket"] = (double)_octreeInboundPacketProcessor->getAverageTransitTimePerPacket();
+        timingArray2["2. avgProcessTimePerPacket"] = (double)_octreeInboundPacketProcessor->getAverageProcessTimePerPacket();
+        timingArray2["3. avgLockWaitTimePerPacket"] = (double)_octreeInboundPacketProcessor->getAverageLockWaitTimePerPacket();
+        timingArray2["4. avgProcessTimePerElement"] = (double)_octreeInboundPacketProcessor->getAverageProcessTimePerElement();
+        timingArray2["5. avgLockWaitTimePerElement"] = (double)_octreeInboundPacketProcessor->getAverageLockWaitTimePerElement();
+    }
     
     QJsonObject statsObject3;
     statsObject3["data"] = dataArray2;
diff --git a/assignment-client/src/octree/OctreeServer.h b/assignment-client/src/octree/OctreeServer.h
index 64903ee558..b8e4a5c261 100644
--- a/assignment-client/src/octree/OctreeServer.h
+++ b/assignment-client/src/octree/OctreeServer.h
@@ -135,8 +135,8 @@ protected:
     bool readOptionBool(const QString& optionName, const QJsonObject& settingsSectionObject, bool& result);
     bool readOptionInt(const QString& optionName, const QJsonObject& settingsSectionObject, int& result);
     bool readOptionString(const QString& optionName, const QJsonObject& settingsSectionObject, QString& result);
-    void readConfiguration();
-    virtual void readAdditionalConfiguration(const QJsonObject& settingsSectionObject) { };
+    bool readConfiguration();
+    virtual bool readAdditionalConfiguration(const QJsonObject& settingsSectionObject) { return true;  };
     void parsePayload();
     void initHTTPManager(int port);
     void resetSendingStats();
diff --git a/examples/controllers/handControllerGrab.js b/examples/controllers/handControllerGrab.js
index 7d4380d764..82fd847f25 100644
--- a/examples/controllers/handControllerGrab.js
+++ b/examples/controllers/handControllerGrab.js
@@ -4,7 +4,7 @@
 //  Created by Eric Levin on  9/2/15
 //  Copyright 2015 High Fidelity, Inc.
 //
-//  Grab's physically moveable entities with the hydra- works for either near or far objects. User can also grab a far away object and drag it towards them by pressing the "4" button on either the left or ride controller.
+//  Grabs physically moveable entities with hydra-like controllers; it works for either near or far objects.
 //
 //  Distributed under the Apache License, Version 2.0.
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
@@ -13,6 +13,8 @@
 
 Script.include("../libraries/utils.js");
 
+var RADIUS_FACTOR = 4;
+
 var RIGHT_HAND_CLICK = Controller.findAction("RIGHT_HAND_CLICK");
 var rightTriggerAction = RIGHT_HAND_CLICK;
 
@@ -45,7 +47,7 @@ var INTERSECT_COLOR = {
     blue: 10
 };
 
-var GRAB_RADIUS = 1.5;
+var GRAB_RADIUS = 0.3;
 
 var GRAB_COLOR = {
     red: 250,
@@ -58,12 +60,11 @@ var DISTANCE_HOLD_THRESHOLD = 0.8;
 var right4Action = 18;
 var left4Action = 17;
 
-var TRACTOR_BEAM_VELOCITY_THRESHOLD = 0.5;
-
 var RIGHT = 1;
 var LEFT = 0;
 var rightController = new controller(RIGHT, rightTriggerAction, right4Action, "right");
 var leftController = new controller(LEFT, leftTriggerAction, left4Action, "left");
+var startTime = Date.now();
 
 
 //Need to wait before calling these methods for some reason...
@@ -78,56 +79,67 @@ function controller(side, triggerAction, pullAction, hand) {
         this.getHandPosition = MyAvatar.getRightPalmPosition;
         this.getHandRotation = MyAvatar.getRightPalmRotation;
     } else {
-
         this.getHandPosition = MyAvatar.getLeftPalmPosition;
         this.getHandRotation = MyAvatar.getLeftPalmRotation;
     }
     this.triggerAction = triggerAction;
     this.pullAction = pullAction;
     this.actionID = null;
-    this.tractorBeamActive = false;
     this.distanceHolding = false;
     this.closeGrabbing = false;
     this.triggerValue = 0;
     this.prevTriggerValue = 0;
     this.palm = 2 * side;
     this.tip = 2 * side + 1;
-    this.pointer = Entities.addEntity({
-        type: "Line",
-        name: "pointer",
-        color: NO_INTERSECT_COLOR,
-        dimensions: {
-            x: 1000,
-            y: 1000,
-            z: 1000
-        },
-        visible: false,
-        lifetime: LIFETIME
-    });
-
+    this.pointer = null;
 }
 
 
 controller.prototype.updateLine = function() {
-    var handPosition = Controller.getSpatialControlPosition(this.palm);
-    var direction = Controller.getSpatialControlNormal(this.tip);
+    if (this.pointer != null) {
+        if (Entities.getEntityProperties(this.pointer).id != this.poitner) {
+            this.pointer == null;
+        }
+    }
 
-    Entities.editEntity(this.pointer, {
-        position: handPosition,
-        linePoints: [
-            ZERO_VEC,
-            Vec3.multiply(direction, LINE_LENGTH)
-        ]
-    });
+    if (this.pointer == null) {
+        this.lineCreationTime = Date.now();
+        this.pointer = Entities.addEntity({
+            type: "Line",
+            name: "pointer",
+            color: NO_INTERSECT_COLOR,
+            dimensions: {
+                x: 1000,
+                y: 1000,
+                z: 1000
+            },
+            visible: true,
+            lifetime: LIFETIME
+        });
+    }
+
+
+    var handPosition = this.getHandPosition();
+    var direction = Quat.getUp(this.getHandRotation());
 
     //only check if we havent already grabbed an object
     if (this.distanceHolding) {
+        Entities.editEntity(this.pointer, {
+            position: handPosition,
+            linePoints: [ ZERO_VEC, Vec3.subtract(Entities.getEntityProperties(this.grabbedEntity).position, handPosition) ],
+            lifetime: (Date.now() - startTime) / 1000.0 + LIFETIME
+        });
+
         return;
     }
 
-    //move origin a bit away from hand so nothing gets in way
-    var origin = Vec3.sum(handPosition, direction);
-    if (this.checkForIntersections(origin, direction)) {
+    Entities.editEntity(this.pointer, {
+        position: handPosition,
+        linePoints: [ ZERO_VEC, Vec3.multiply(direction, LINE_LENGTH) ],
+        lifetime: (Date.now() - startTime) / 1000.0 + LIFETIME
+    });
+
+    if (this.checkForIntersections(handPosition, direction)) {
         Entities.editEntity(this.pointer, {
             color: INTERSECT_COLOR,
         });
@@ -144,7 +156,7 @@ controller.prototype.checkPointer = function() {
     Script.setTimeout(function() {
         var props = Entities.getEntityProperties(self.pointer);
         Entities.editEntity(self.pointer, {
-            lifetime: props.age + EXTRA_TIME + LIFETIME
+            lifetime: (Date.now() - startTime) / 1000.0 + LIFETIME
         });
         self.checkPointer();
     }, POINTER_CHECK_TIME);
@@ -172,28 +184,54 @@ controller.prototype.checkForIntersections = function(origin, direction) {
     return false;
 }
 
+
 controller.prototype.attemptMove = function() {
-    if (this.tractorBeamActive) {
-        return;
-    }
     if (this.grabbedEntity || this.distanceHolding) {
         var handPosition = Controller.getSpatialControlPosition(this.palm);
-        var direction = Controller.getSpatialControlNormal(this.tip);
+        var handRotation = Quat.multiply(MyAvatar.orientation, Controller.getSpatialControlRawRotation(this.palm));
 
-        var newPosition = Vec3.sum(handPosition, Vec3.multiply(direction, this.distanceToEntity))
         this.distanceHolding = true;
         if (this.actionID === null) {
+            this.currentObjectPosition = Entities.getEntityProperties(this.grabbedEntity).position;
+            this.currentObjectRotation = Entities.getEntityProperties(this.grabbedEntity).rotation;
+
+            this.handPreviousPosition = handPosition;
+            this.handPreviousRotation = handRotation;
+
             this.actionID = Entities.addAction("spring", this.grabbedEntity, {
-                targetPosition: newPosition,
-                linearTimeScale: .1
+                targetPosition: this.currentObjectPosition,
+                linearTimeScale: .1,
+                targetRotation: this.currentObjectRotation,
+                angularTimeScale: .1
             });
         } else {
+            var radius = Math.max(Vec3.distance(this.currentObjectPosition, handPosition) * RADIUS_FACTOR, 1.0);
+
+            var handMoved = Vec3.subtract(handPosition, this.handPreviousPosition);
+            this.handPreviousPosition = handPosition;
+            var superHandMoved = Vec3.multiply(handMoved, radius);
+            this.currentObjectPosition = Vec3.sum(this.currentObjectPosition, superHandMoved);
+
+            // ---------------- this tracks hand rotation
+            // var handChange = Quat.multiply(handRotation, Quat.inverse(this.handPreviousRotation));
+            // this.handPreviousRotation = handRotation;
+            // this.currentObjectRotation = Quat.multiply(handChange, this.currentObjectRotation);
+            // ----------------
+
+            // ---------------- this doubles hand rotation
+            var handChange = Quat.multiply(Quat.slerp(this.handPreviousRotation, handRotation, 2.0),
+                                           Quat.inverse(this.handPreviousRotation));
+            this.handPreviousRotation = handRotation;
+            this.currentObjectRotation = Quat.multiply(handChange, this.currentObjectRotation);
+            // ----------------
+
+
             Entities.updateAction(this.grabbedEntity, this.actionID, {
-                targetPosition: newPosition
+                targetPosition: this.currentObjectPosition, linearTimeScale: .1,
+                targetRotation: this.currentObjectRotation, angularTimeScale: .1
             });
         }
     }
-
 }
 
 controller.prototype.showPointer = function() {
@@ -218,19 +256,10 @@ controller.prototype.letGo = function() {
     this.grabbedEntity = null;
     this.actionID = null;
     this.distanceHolding = false;
-    this.tractorBeamActive = false;
-    this.checkForEntityArrival = false;
     this.closeGrabbing = false;
 }
 
 controller.prototype.update = function() {
-    if (this.tractorBeamActive && this.checkForEntityArrival) {
-        var entityVelocity = Entities.getEntityProperties(this.grabbedEntity).velocity
-        if (Vec3.length(entityVelocity) < TRACTOR_BEAM_VELOCITY_THRESHOLD) {
-            this.letGo();
-        }
-        return;
-    }
     this.triggerValue = Controller.getActionValue(this.triggerAction);
     if (this.triggerValue > SHOW_LINE_THRESHOLD && this.prevTriggerValue < SHOW_LINE_THRESHOLD) {
         //First check if an object is within close range and then run the close grabbing logic
@@ -253,7 +282,6 @@ controller.prototype.update = function() {
         this.attemptMove();
     }
 
-
     this.prevTriggerValue = this.triggerValue;
 }
 
@@ -331,27 +359,6 @@ controller.prototype.deactivateEntity = function(entity) {
     setEntityCustomData(GRAB_USER_DATA_KEY, this.grabbedEntity, data);
 }
 
-controller.prototype.onActionEvent = function(action, state) {
-    if (this.pullAction === action && state === 1) {
-        if (this.actionID !== null) {
-            var self = this;
-            this.tractorBeamActive = true;
-            //We need to wait a bit before checking for entity arrival at target destination (meaning checking for velocity being close to some 
-            //low threshold) because otherwise we'll think the entity has arrived before its even really gotten moving! 
-            Script.setTimeout(function() {
-                self.checkForEntityArrival = true;
-            }, 500);
-            var handPosition = Controller.getSpatialControlPosition(this.palm);
-            var direction = Vec3.normalize(Controller.getSpatialControlNormal(this.tip));
-            //move final destination along line a bit, so it doesnt hit avatar hand
-            Entities.updateAction(this.grabbedEntity, this.actionID, {
-                targetPosition: Vec3.sum(handPosition, Vec3.multiply(3, direction))
-            });
-        }
-    }
-
-}
-
 controller.prototype.cleanup = function() {
     Entities.deleteEntity(this.pointer);
     if (this.grabbedEntity) {
@@ -364,13 +371,6 @@ function update() {
     leftController.update();
 }
 
-function onActionEvent(action, state) {
-    rightController.onActionEvent(action, state);
-    leftController.onActionEvent(action, state);
-
-}
-
-
 function cleanup() {
     rightController.cleanup();
     leftController.cleanup();
@@ -378,4 +378,3 @@ function cleanup() {
 
 Script.scriptEnding.connect(cleanup);
 Script.update.connect(update)
-Controller.actionEvent.connect(onActionEvent);
\ No newline at end of file
diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index 164f04f2eb..b6e0a871b3 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -2868,8 +2868,8 @@ void Application::update(float deltaTime) {
     UserInputMapper::PoseValue leftHand = userInputMapper->getPoseState(UserInputMapper::LEFT_HAND);
     UserInputMapper::PoseValue rightHand = userInputMapper->getPoseState(UserInputMapper::RIGHT_HAND);
     Hand* hand = DependencyManager::get<AvatarManager>()->getMyAvatar()->getHand();
-    setPalmData(hand, leftHand, deltaTime, LEFT_HAND_INDEX);
-    setPalmData(hand, rightHand, deltaTime, RIGHT_HAND_INDEX);
+    setPalmData(hand, leftHand, deltaTime, LEFT_HAND_INDEX, userInputMapper->getActionState(UserInputMapper::LEFT_HAND_CLICK));
+    setPalmData(hand, rightHand, deltaTime, RIGHT_HAND_INDEX, userInputMapper->getActionState(UserInputMapper::RIGHT_HAND_CLICK));
     if (Menu::getInstance()->isOptionChecked(MenuOption::HandMouseInput)) {
         emulateMouse(hand, userInputMapper->getActionState(UserInputMapper::LEFT_HAND_CLICK),
             userInputMapper->getActionState(UserInputMapper::SHIFT), LEFT_HAND_INDEX);
@@ -4026,8 +4026,8 @@ void Application::registerScriptEngineWithApplicationServices(ScriptEngine* scri
     AvatarManager::registerMetaTypes(scriptEngine);
 
     // hook our avatar and avatar hash map object into this script engine
-    scriptEngine->setAvatarData(_myAvatar, "MyAvatar"); // leave it as a MyAvatar class to expose thrust features
-    scriptEngine->setAvatarHashMap(DependencyManager::get<AvatarManager>().data(), "AvatarList");
+    scriptEngine->registerGlobalObject("MyAvatar", _myAvatar);
+    scriptEngine->registerGlobalObject("AvatarList", DependencyManager::get<AvatarManager>().data());
 
     scriptEngine->registerGlobalObject("Camera", &_myCamera);
 
@@ -4051,9 +4051,9 @@ void Application::registerScriptEngineWithApplicationServices(ScriptEngine* scri
 
     scriptEngine->registerGlobalObject("Desktop", DependencyManager::get<DesktopScriptingInterface>().data());
 
-    QScriptValue windowValue = scriptEngine->registerGlobalObject("Window", DependencyManager::get<WindowScriptingInterface>().data());
+    scriptEngine->registerGlobalObject("Window", DependencyManager::get<WindowScriptingInterface>().data());
     scriptEngine->registerGetterSetter("location", LocationScriptingInterface::locationGetter,
-                                       LocationScriptingInterface::locationSetter, windowValue);
+                        LocationScriptingInterface::locationSetter, "Window");
     // register `location` on the global object.
     scriptEngine->registerGetterSetter("location", LocationScriptingInterface::locationGetter,
                                        LocationScriptingInterface::locationSetter);
@@ -4083,9 +4083,9 @@ void Application::registerScriptEngineWithApplicationServices(ScriptEngine* scri
 
     scriptEngine->registerGlobalObject("Paths", DependencyManager::get<PathUtils>().data());
 
-    QScriptValue hmdInterface = scriptEngine->registerGlobalObject("HMD", &HMDScriptingInterface::getInstance());
-    scriptEngine->registerFunction(hmdInterface, "getHUDLookAtPosition2D", HMDScriptingInterface::getHUDLookAtPosition2D, 0);
-    scriptEngine->registerFunction(hmdInterface, "getHUDLookAtPosition3D", HMDScriptingInterface::getHUDLookAtPosition3D, 0);
+    scriptEngine->registerGlobalObject("HMD", &HMDScriptingInterface::getInstance());
+    scriptEngine->registerFunction("HMD", "getHUDLookAtPosition2D", HMDScriptingInterface::getHUDLookAtPosition2D, 0);
+    scriptEngine->registerFunction("HMD", "getHUDLookAtPosition3D", HMDScriptingInterface::getHUDLookAtPosition3D, 0);
 
     scriptEngine->registerGlobalObject("Scene", DependencyManager::get<SceneScriptingInterface>().data());
 
@@ -4094,31 +4094,6 @@ void Application::registerScriptEngineWithApplicationServices(ScriptEngine* scri
 #ifdef HAVE_RTMIDI
     scriptEngine->registerGlobalObject("MIDI", &MIDIManager::getInstance());
 #endif
-
-    // TODO: Consider moving some of this functionality into the ScriptEngine class instead. It seems wrong that this
-    // work is being done in the Application class when really these dependencies are more related to the ScriptEngine's
-    // implementation
-    QThread* workerThread = new QThread(this);
-    QString scriptEngineName = QString("Script Thread:") + scriptEngine->getFilename();
-    workerThread->setObjectName(scriptEngineName);
-
-    // when the worker thread is started, call our engine's run..
-    connect(workerThread, &QThread::started, scriptEngine, &ScriptEngine::run);
-    
-    // when the thread is terminated, add both scriptEngine and thread to the deleteLater queue
-    connect(scriptEngine, &ScriptEngine::doneRunning, scriptEngine, &ScriptEngine::deleteLater);
-    connect(workerThread, &QThread::finished, workerThread, &QThread::deleteLater);
-    
-    // tell the thread to stop when the script engine is done
-    connect(scriptEngine, &ScriptEngine::destroyed, workerThread, &QThread::quit);
-
-    auto nodeList = DependencyManager::get<NodeList>();
-    connect(nodeList.data(), &NodeList::nodeKilled, scriptEngine, &ScriptEngine::nodeKilled);
-
-    scriptEngine->moveToThread(workerThread);
-
-    // Starts an event loop, and emits workerThread->started()
-    workerThread->start();
 }
 
 void Application::initializeAcceptedFiles() {
@@ -4264,11 +4239,14 @@ ScriptEngine* Application::loadScript(const QString& scriptFilename, bool isUser
     scriptEngine->setUserLoaded(isUserLoaded);
 
     if (scriptFilename.isNull()) {
+        // This appears to be the script engine used by the script widget's evaluation window before the file has been saved...
+
         // this had better be the script editor (we should de-couple so somebody who thinks they are loading a script
         // doesn't just get an empty script engine)
 
         // we can complete setup now since there isn't a script we have to load
         registerScriptEngineWithApplicationServices(scriptEngine);
+        scriptEngine->runInThread();
     } else {
         // connect to the appropriate signals of this script engine
         connect(scriptEngine, &ScriptEngine::scriptLoaded, this, &Application::handleScriptEngineLoaded);
@@ -4290,6 +4268,7 @@ void Application::reloadScript(const QString& scriptName, bool isUserLoaded) {
     loadScript(scriptName, isUserLoaded, false, false, true);
 }
 
+// FIXME - change to new version of ScriptCache loading notification
 void Application::handleScriptEngineLoaded(const QString& scriptFilename) {
     ScriptEngine* scriptEngine = qobject_cast<ScriptEngine*>(sender());
 
@@ -4299,8 +4278,10 @@ void Application::handleScriptEngineLoaded(const QString& scriptFilename) {
 
     // register our application services and set it off on its own thread
     registerScriptEngineWithApplicationServices(scriptEngine);
+    scriptEngine->runInThread();
 }
 
+// FIXME - change to new version of ScriptCache loading notification
 void Application::handleScriptLoadError(const QString& scriptFilename) {
     qCDebug(interfaceapp) << "Application::loadScript(), script failed to load...";
     QMessageBox::warning(getWindow(), "Error Loading Script", scriptFilename + " failed to load.");
@@ -4970,7 +4951,7 @@ mat4 Application::getHMDSensorPose() const {
     return mat4();
 }
 
-void Application::setPalmData(Hand* hand, UserInputMapper::PoseValue pose, float deltaTime, int index) {
+void Application::setPalmData(Hand* hand, UserInputMapper::PoseValue pose, float deltaTime, int index, float triggerValue) {
     PalmData* palm;
     bool foundHand = false;
     for (size_t j = 0; j < hand->getNumPalms(); j++) {
@@ -5040,6 +5021,7 @@ void Application::setPalmData(Hand* hand, UserInputMapper::PoseValue pose, float
         palm->setTipVelocity(glm::vec3(0.0f));
     }
     palm->setTipPosition(newTipPosition);
+    palm->setTrigger(triggerValue);
 }
 
 void Application::emulateMouse(Hand* hand, float click, float shift, int index) {
diff --git a/interface/src/Application.h b/interface/src/Application.h
index b997fae823..6213dae4fa 100644
--- a/interface/src/Application.h
+++ b/interface/src/Application.h
@@ -485,7 +485,7 @@ private:
 
     void update(float deltaTime);
 
-    void setPalmData(Hand* hand, UserInputMapper::PoseValue pose, float deltaTime, int index);
+    void setPalmData(Hand* hand, UserInputMapper::PoseValue pose, float deltaTime, int index, float triggerValue);
     void emulateMouse(Hand* hand, float click, float shift, int index);
 
     // Various helper functions called during update()
diff --git a/interface/src/avatar/MyAvatar.cpp b/interface/src/avatar/MyAvatar.cpp
index 9496c60d26..da2e78c5a3 100644
--- a/interface/src/avatar/MyAvatar.cpp
+++ b/interface/src/avatar/MyAvatar.cpp
@@ -1296,10 +1296,13 @@ void MyAvatar::initAnimGraph() {
     // ik-avatar.json
     // https://gist.github.com/hyperlogic/e58e0a24cc341ad5d060
     //
+    // ik-avatar-hands.json
+    // https://gist.githubusercontent.com/hyperlogic/04a02c47eb56d8bfaebb
+    //
     // or run a local web-server
     // python -m SimpleHTTPServer&
-    // auto graphUrl = QUrl("http://localhost:8000/avatar.json");
-    auto graphUrl = QUrl("https://gist.githubusercontent.com/hyperlogic/e58e0a24cc341ad5d060/raw/8f824da2908fd89ad1befadd1d8f5d7b3b6efa66/ik-avatar.json");
+    //auto graphUrl = QUrl("http://localhost:8000/avatar.json");
+    auto graphUrl = QUrl("https://gist.githubusercontent.com/hyperlogic/04a02c47eb56d8bfaebb/raw/883c7ce8e75ad3f72a0d513c317fe4b74a41c3b8/ik-avatar-hands.json");
     _rig->initAnimGraph(graphUrl, _skeletonModel.getGeometry()->getFBXGeometry());
 }
 
diff --git a/interface/src/avatar/SkeletonModel.cpp b/interface/src/avatar/SkeletonModel.cpp
index 41ca193a7a..3894a0ade9 100644
--- a/interface/src/avatar/SkeletonModel.cpp
+++ b/interface/src/avatar/SkeletonModel.cpp
@@ -96,6 +96,17 @@ void SkeletonModel::initJointStates(QVector<JointState> states) {
     emit skeletonLoaded();
 }
 
+static const PalmData* getPalmWithIndex(Hand* hand, int index) {
+    const PalmData* palm = nullptr;
+    for (size_t j = 0; j < hand->getNumPalms(); j++) {
+        if (hand->getPalms()[j].getSixenseID() == index) {
+            palm = &(hand->getPalms()[j]);
+            break;
+        }
+    }
+    return palm;
+}
+
 const float PALM_PRIORITY = DEFAULT_PRIORITY;
 // Called within Model::simulate call, below.
 void SkeletonModel::updateRig(float deltaTime, glm::mat4 parentTransform) {
@@ -108,34 +119,59 @@ void SkeletonModel::updateRig(float deltaTime, glm::mat4 parentTransform) {
         MyAvatar* myAvatar = static_cast<MyAvatar*>(_owningAvatar);
         const FBXGeometry& geometry = _geometry->getFBXGeometry();
 
-        Rig::HeadParameters params;
-        params.modelRotation = getRotation();
-        params.modelTranslation = getTranslation();
-        params.enableLean = qApp->getAvatarUpdater()->isHMDMode() && !myAvatar->getStandingHMDSensorMode();
-        params.leanSideways = head->getFinalLeanSideways();
-        params.leanForward = head->getFinalLeanForward();
-        params.torsoTwist = head->getTorsoTwist();
-        params.localHeadOrientation = head->getFinalOrientationInLocalFrame();
-        params.localHeadPitch = head->getFinalPitch();
-        params.localHeadYaw = head->getFinalYaw();
-        params.localHeadRoll = head->getFinalRoll();
-        params.isInHMD = qApp->getAvatarUpdater()->isHMDMode();
+        Rig::HeadParameters headParams;
+        headParams.modelRotation = getRotation();
+        headParams.modelTranslation = getTranslation();
+        headParams.enableLean = qApp->getAvatarUpdater()->isHMDMode() && !myAvatar->getStandingHMDSensorMode();
+        headParams.leanSideways = head->getFinalLeanSideways();
+        headParams.leanForward = head->getFinalLeanForward();
+        headParams.torsoTwist = head->getTorsoTwist();
+        headParams.localHeadOrientation = head->getFinalOrientationInLocalFrame();
+        headParams.localHeadPitch = head->getFinalPitch();
+        headParams.localHeadYaw = head->getFinalYaw();
+        headParams.localHeadRoll = head->getFinalRoll();
+        headParams.isInHMD = qApp->getAvatarUpdater()->isHMDMode();
 
         // get HMD position from sensor space into world space, and back into model space
         glm::mat4 worldToModel = glm::inverse(createMatFromQuatAndPos(myAvatar->getOrientation(), myAvatar->getPosition()));
         glm::vec3 yAxis(0.0f, 1.0f, 0.0f);
         glm::vec3 hmdPosition = glm::angleAxis((float)M_PI, yAxis) * transformPoint(worldToModel * myAvatar->getSensorToWorldMatrix(), myAvatar->getHMDSensorPosition());
-        params.localHeadPosition = hmdPosition;
+        headParams.localHeadPosition = hmdPosition;
 
-        params.worldHeadOrientation = head->getFinalOrientationInWorldFrame();
-        params.eyeLookAt = head->getLookAtPosition();
-        params.eyeSaccade = head->getSaccade();
-        params.leanJointIndex = geometry.leanJointIndex;
-        params.neckJointIndex = geometry.neckJointIndex;
-        params.leftEyeJointIndex = geometry.leftEyeJointIndex;
-        params.rightEyeJointIndex = geometry.rightEyeJointIndex;
+        headParams.worldHeadOrientation = head->getFinalOrientationInWorldFrame();
+        headParams.eyeLookAt = head->getLookAtPosition();
+        headParams.eyeSaccade = head->getSaccade();
+        headParams.leanJointIndex = geometry.leanJointIndex;
+        headParams.neckJointIndex = geometry.neckJointIndex;
+        headParams.leftEyeJointIndex = geometry.leftEyeJointIndex;
+        headParams.rightEyeJointIndex = geometry.rightEyeJointIndex;
+
+        _rig->updateFromHeadParameters(headParams, deltaTime);
+
+        Rig::HandParameters handParams;
+
+        const PalmData* leftPalm = getPalmWithIndex(myAvatar->getHand(), LEFT_HAND_INDEX);
+        if (leftPalm && leftPalm->isActive()) {
+            handParams.isLeftEnabled = true;
+            handParams.leftPosition = leftPalm->getRawPosition();
+            handParams.leftOrientation = leftPalm->getRawRotation();
+            handParams.leftTrigger = leftPalm->getTrigger();
+        } else {
+            handParams.isLeftEnabled = false;
+        }
+
+        const PalmData* rightPalm = getPalmWithIndex(myAvatar->getHand(), RIGHT_HAND_INDEX);
+        if (rightPalm && rightPalm->isActive()) {
+            handParams.isRightEnabled = true;
+            handParams.rightPosition = rightPalm->getRawPosition();
+            handParams.rightOrientation = rightPalm->getRawRotation();
+            handParams.rightTrigger = rightPalm->getTrigger();
+        } else {
+            handParams.isRightEnabled = false;
+        }
+
+        _rig->updateFromHandParameters(handParams, deltaTime);
 
-        _rig->updateFromHeadParameters(params);
     } else {
         // This is a little more work than we really want.
         //
diff --git a/libraries/animation/src/AnimNodeLoader.cpp b/libraries/animation/src/AnimNodeLoader.cpp
index aa58845f01..9d6eb12e44 100644
--- a/libraries/animation/src/AnimNodeLoader.cpp
+++ b/libraries/animation/src/AnimNodeLoader.cpp
@@ -172,7 +172,12 @@ static AnimNode::Pointer loadNode(const QJsonObject& jsonObj, const QUrl& jsonUr
             qCCritical(animation) << "AnimNodeLoader, bad object in \"children\", id =" << id << ", url =" << jsonUrl.toDisplayString();
             return nullptr;
         }
-        node->addChild(loadNode(childValue.toObject(), jsonUrl));
+        AnimNode::Pointer child = loadNode(childValue.toObject(), jsonUrl);
+        if (child) {
+            node->addChild(child);
+        } else {
+            return nullptr;
+        }
     }
 
     if ((animNodeTypeToProcessFunc(type))(node, dataObj, id, jsonUrl)) {
@@ -232,13 +237,15 @@ static const char* boneSetStrings[AnimOverlay::NumBoneSets] = {
     "fullBody",
     "upperBody",
     "lowerBody",
-    "rightArm",
     "leftArm",
+    "rightArm",
     "aboveTheHead",
     "belowTheHead",
     "headOnly",
     "spineOnly",
-    "empty"
+    "empty",
+    "leftHand",
+    "rightHand"
 };
 
 static AnimOverlay::BoneSet stringToBoneSetEnum(const QString& str) {
diff --git a/libraries/animation/src/AnimOverlay.cpp b/libraries/animation/src/AnimOverlay.cpp
index 52026f7711..1a0a16ca8a 100644
--- a/libraries/animation/src/AnimOverlay.cpp
+++ b/libraries/animation/src/AnimOverlay.cpp
@@ -26,12 +26,14 @@ void AnimOverlay::buildBoneSet(BoneSet boneSet) {
     case FullBodyBoneSet: buildFullBodyBoneSet(); break;
     case UpperBodyBoneSet: buildUpperBodyBoneSet(); break;
     case LowerBodyBoneSet: buildLowerBodyBoneSet(); break;
-    case RightArmBoneSet: buildRightArmBoneSet(); break;
     case LeftArmBoneSet: buildLeftArmBoneSet(); break;
+    case RightArmBoneSet: buildRightArmBoneSet(); break;
     case AboveTheHeadBoneSet: buildAboveTheHeadBoneSet(); break;
     case BelowTheHeadBoneSet: buildBelowTheHeadBoneSet(); break;
     case HeadOnlyBoneSet: buildHeadOnlyBoneSet(); break;
     case SpineOnlyBoneSet: buildSpineOnlyBoneSet(); break;
+    case LeftHandBoneSet: buildLeftHandBoneSet(); break;
+    case RightHandBoneSet: buildRightHandBoneSet(); break;
     default:
     case EmptyBoneSet: buildEmptyBoneSet(); break;
     }
@@ -110,15 +112,6 @@ void AnimOverlay::buildLowerBodyBoneSet() {
     _boneSetVec[hipsJoint] = 0.0f;
 }
 
-void AnimOverlay::buildRightArmBoneSet() {
-    assert(_skeleton);
-    buildEmptyBoneSet();
-    int rightShoulderJoint = _skeleton->nameToJointIndex("RightShoulder");
-    for_each_child_joint(_skeleton, rightShoulderJoint, [&](int i) {
-        _boneSetVec[i] = 1.0f;
-    });
-}
-
 void AnimOverlay::buildLeftArmBoneSet() {
     assert(_skeleton);
     buildEmptyBoneSet();
@@ -128,6 +121,15 @@ void AnimOverlay::buildLeftArmBoneSet() {
     });
 }
 
+void AnimOverlay::buildRightArmBoneSet() {
+    assert(_skeleton);
+    buildEmptyBoneSet();
+    int rightShoulderJoint = _skeleton->nameToJointIndex("RightShoulder");
+    for_each_child_joint(_skeleton, rightShoulderJoint, [&](int i) {
+        _boneSetVec[i] = 1.0f;
+    });
+}
+
 void AnimOverlay::buildAboveTheHeadBoneSet() {
     assert(_skeleton);
     buildEmptyBoneSet();
@@ -168,13 +170,31 @@ void AnimOverlay::buildEmptyBoneSet() {
     }
 }
 
+void AnimOverlay::buildLeftHandBoneSet() {
+    assert(_skeleton);
+    buildEmptyBoneSet();
+    int headJoint = _skeleton->nameToJointIndex("LeftHand");
+    for_each_child_joint(_skeleton, headJoint, [&](int i) {
+        _boneSetVec[i] = 1.0f;
+    });
+}
+
+void AnimOverlay::buildRightHandBoneSet() {
+    assert(_skeleton);
+    buildEmptyBoneSet();
+    int headJoint = _skeleton->nameToJointIndex("RightHand");
+    for_each_child_joint(_skeleton, headJoint, [&](int i) {
+        _boneSetVec[i] = 1.0f;
+    });
+}
+
 // for AnimDebugDraw rendering
 const AnimPoseVec& AnimOverlay::getPosesInternal() const {
     return _poses;
 }
 
 void AnimOverlay::setSkeletonInternal(AnimSkeleton::ConstPointer skeleton) {
-    _skeleton = skeleton;
+    AnimNode::setSkeletonInternal(skeleton);
 
     // we have to re-build the bone set when the skeleton changes.
     buildBoneSet(_boneSet);
diff --git a/libraries/animation/src/AnimOverlay.h b/libraries/animation/src/AnimOverlay.h
index de563cc403..2a87c54997 100644
--- a/libraries/animation/src/AnimOverlay.h
+++ b/libraries/animation/src/AnimOverlay.h
@@ -28,14 +28,16 @@ public:
         FullBodyBoneSet = 0,
         UpperBodyBoneSet,
         LowerBodyBoneSet,
-        RightArmBoneSet,
         LeftArmBoneSet,
+        RightArmBoneSet,
         AboveTheHeadBoneSet,
         BelowTheHeadBoneSet,
         HeadOnlyBoneSet,
         SpineOnlyBoneSet,
         EmptyBoneSet,
-        NumBoneSets,
+        LeftHandBoneSet,
+        RightHandBoneSet,
+        NumBoneSets
     };
 
     AnimOverlay(const std::string& id, BoneSet boneSet, float alpha);
@@ -64,13 +66,15 @@ public:
     void buildFullBodyBoneSet();
     void buildUpperBodyBoneSet();
     void buildLowerBodyBoneSet();
-    void buildRightArmBoneSet();
     void buildLeftArmBoneSet();
+    void buildRightArmBoneSet();
     void buildAboveTheHeadBoneSet();
     void buildBelowTheHeadBoneSet();
     void buildHeadOnlyBoneSet();
     void buildSpineOnlyBoneSet();
     void buildEmptyBoneSet();
+    void buildLeftHandBoneSet();
+    void buildRightHandBoneSet();
 
     // no copies
     AnimOverlay(const AnimOverlay&) = delete;
diff --git a/libraries/animation/src/Rig.cpp b/libraries/animation/src/Rig.cpp
index 3729dc8ca7..076baf92c5 100644
--- a/libraries/animation/src/Rig.cpp
+++ b/libraries/animation/src/Rig.cpp
@@ -952,7 +952,7 @@ glm::quat Rig::getJointDefaultRotationInParentFrame(int jointIndex) {
     return _jointStates[jointIndex].getDefaultRotationInParentFrame();
 }
 
-void Rig::updateFromHeadParameters(const HeadParameters& params) {
+void Rig::updateFromHeadParameters(const HeadParameters& params, float dt) {
     if (params.enableLean) {
         updateLeanJoint(params.leanJointIndex, params.leanSideways, params.leanForward, params.torsoTwist);
     }
@@ -1048,6 +1048,52 @@ void Rig::updateEyeJoint(int index, const glm::vec3& modelTranslation, const glm
     }
 }
 
+void Rig::updateFromHandParameters(const HandParameters& params, float dt) {
+
+    if (_enableAnimGraph && _animSkeleton) {
+
+        // set leftHand grab vars
+        _animVars.set("isLeftHandIdle", false);
+        _animVars.set("isLeftHandPoint", false);
+        _animVars.set("isLeftHandGrab", false);
+
+        // Split the trigger range into three zones.
+        bool rampOut = false;
+        if (params.leftTrigger > 0.6666f) {
+            _animVars.set("isLeftHandGrab", true);
+        } else if (params.leftTrigger > 0.3333f) {
+            _animVars.set("isLeftHandPoint", true);
+        } else {
+            _animVars.set("isLeftHandIdle", true);
+            rampOut = true;
+        }
+        const float OVERLAY_RAMP_OUT_SPEED = 6.0f;  // ramp in and out over 1/6th of a sec
+        _leftHandOverlayAlpha = glm::clamp(_leftHandOverlayAlpha + (rampOut ? -1.0f : 1.0f) * OVERLAY_RAMP_OUT_SPEED * dt, 0.0f, 1.0f);
+        _animVars.set("leftHandOverlayAlpha", _leftHandOverlayAlpha);
+        _animVars.set("leftHandGrabBlend", params.leftTrigger);
+
+
+        // set leftHand grab vars
+        _animVars.set("isRightHandIdle", false);
+        _animVars.set("isRightHandPoint", false);
+        _animVars.set("isRightHandGrab", false);
+
+        // Split the trigger range into three zones
+        rampOut = false;
+        if (params.rightTrigger > 0.6666f) {
+            _animVars.set("isRightHandGrab", true);
+        } else if (params.rightTrigger > 0.3333f) {
+            _animVars.set("isRightHandPoint", true);
+        } else {
+            _animVars.set("isRightHandIdle", true);
+            rampOut = true;
+        }
+        _rightHandOverlayAlpha = glm::clamp(_rightHandOverlayAlpha + (rampOut ? -1.0f : 1.0f) * OVERLAY_RAMP_OUT_SPEED * dt, 0.0f, 1.0f);
+        _animVars.set("rightHandOverlayAlpha", _rightHandOverlayAlpha);
+        _animVars.set("rightHandGrabBlend", params.rightTrigger);
+    }
+}
+
 void Rig::initAnimGraph(const QUrl& url, const FBXGeometry& fbxGeometry) {
     if (!_enableAnimGraph) {
         return;
diff --git a/libraries/animation/src/Rig.h b/libraries/animation/src/Rig.h
index 18e888d2b0..9939f383b7 100644
--- a/libraries/animation/src/Rig.h
+++ b/libraries/animation/src/Rig.h
@@ -76,6 +76,17 @@ public:
         void dump() const;
     };
 
+    struct HandParameters {
+        bool isLeftEnabled;
+        bool isRightEnabled;
+        glm::vec3 leftPosition = glm::vec3();
+        glm::quat leftOrientation = glm::quat();
+        glm::vec3 rightPosition = glm::vec3();
+        glm::quat rightOrientation = glm::quat();
+        float leftTrigger = 0.0f;
+        float rightTrigger = 0.0f;
+    };
+
     virtual ~Rig() {}
 
     RigPointer getRigPointer() { return shared_from_this(); }
@@ -168,10 +179,12 @@ public:
     void setEnableAnimGraph(bool isEnabled) { _enableAnimGraph = isEnabled; }
     bool getEnableAnimGraph() const { return _enableAnimGraph; }
 
-    void updateFromHeadParameters(const HeadParameters& params);
+    void updateFromHeadParameters(const HeadParameters& params, float dt);
     void updateEyeJoints(int leftEyeIndex, int rightEyeIndex, const glm::vec3& modelTranslation, const glm::quat& modelRotation,
                          const glm::quat& worldHeadOrientation, const glm::vec3& lookAtSpot, const glm::vec3& saccade = glm::vec3(0.0f));
 
+    void updateFromHandParameters(const HandParameters& params, float dt);
+
     virtual void setHandPosition(int jointIndex, const glm::vec3& position, const glm::quat& rotation,
                                  float scale, float priority) = 0;
 
@@ -215,6 +228,8 @@ public:
         Move
     };
     RigRole _state = RigRole::Idle;
+    float _leftHandOverlayAlpha = 0.0f;
+    float _rightHandOverlayAlpha = 0.0f;
 };
 
 #endif /* defined(__hifi__Rig__) */
diff --git a/libraries/animation/src/SwingTwistConstraint.cpp b/libraries/animation/src/SwingTwistConstraint.cpp
index b788be5ce7..f9cea2abad 100644
--- a/libraries/animation/src/SwingTwistConstraint.cpp
+++ b/libraries/animation/src/SwingTwistConstraint.cpp
@@ -72,7 +72,7 @@ SwingTwistConstraint::SwingTwistConstraint() :
         _swingLimitFunction(),
         _minTwist(-PI),
         _maxTwist(PI),
-        _lastTwistBoundary(0)
+        _lastTwistBoundary(LAST_CLAMP_NO_BOUNDARY)
 {
 }
 
@@ -249,3 +249,6 @@ bool SwingTwistConstraint::apply(glm::quat& rotation) const {
     return false;
 }
 
+void SwingTwistConstraint::clearHistory() {
+    _lastTwistBoundary = LAST_CLAMP_NO_BOUNDARY;
+}
diff --git a/libraries/animation/src/SwingTwistConstraint.h b/libraries/animation/src/SwingTwistConstraint.h
index 180127e1e1..155f72a518 100644
--- a/libraries/animation/src/SwingTwistConstraint.h
+++ b/libraries/animation/src/SwingTwistConstraint.h
@@ -73,6 +73,9 @@ public:
     /// \return reference to SwingLimitFunction instance for unit-testing
     const SwingLimitFunction& getSwingLimitFunction() const { return _swingLimitFunction; }
 
+    /// \brief exposed for unit testing
+    void clearHistory();
+
 protected:
     SwingLimitFunction _swingLimitFunction;
     float _minTwist;
diff --git a/libraries/audio/src/AudioFilterBank.h b/libraries/audio/src/AudioFilterBank.h
index 4ea5a3568a..64ea5396e1 100644
--- a/libraries/audio/src/AudioFilterBank.h
+++ b/libraries/audio/src/AudioFilterBank.h
@@ -125,12 +125,12 @@ public:
             return;
         }
 
-        const int scale = (2 << ((8 * sizeof(int16_t)) - 1));
+        const int scale = (1 << ((8 * sizeof(int16_t)) - 1));
 
         // de-interleave and convert int16_t to float32 (normalized to -1. ... 1.)
         for (uint32_t i = 0; i < frameCount; ++i) {
             for (uint32_t j = 0; j < _channelCount; ++j) {
-                _buffer[j][i] = ((float)(*in++)) / scale;
+                _buffer[j][i] = ((float)(*in++)) * (1.0f / scale);
             }
         }
 
diff --git a/libraries/entities-renderer/src/EntityTreeRenderer.cpp b/libraries/entities-renderer/src/EntityTreeRenderer.cpp
index 824f562f6b..2fd760bbd3 100644
--- a/libraries/entities-renderer/src/EntityTreeRenderer.cpp
+++ b/libraries/entities-renderer/src/EntityTreeRenderer.cpp
@@ -49,7 +49,6 @@ EntityTreeRenderer::EntityTreeRenderer(bool wantScripts, AbstractViewStateInterf
     OctreeRenderer(),
     _wantScripts(wantScripts),
     _entitiesScriptEngine(NULL),
-    _sandboxScriptEngine(NULL),
     _lastMouseEventValid(false),
     _viewState(viewState),
     _scriptingServices(scriptingServices),
@@ -77,23 +76,11 @@ EntityTreeRenderer::EntityTreeRenderer(bool wantScripts, AbstractViewStateInterf
 EntityTreeRenderer::~EntityTreeRenderer() {
     // NOTE: we don't need to delete _entitiesScriptEngine because it is registered with the application and has a
     // signal tied to call it's deleteLater on doneRunning
-    if (_sandboxScriptEngine) {
-        // TODO: consider reworking how _sandboxScriptEngine is managed. It's treated differently than _entitiesScriptEngine
-        // because we don't call registerScriptEngineWithApplicationServices() for it. This implementation is confusing and
-        // potentially error prone because it's not a full fledged ScriptEngine that has been fully connected to the
-        // application. We did this so that scripts that were ill-formed could be evaluated but not execute against the
-        // application services. But this means it's shutdown behavior is different from other ScriptEngines
-        delete _sandboxScriptEngine;
-        _sandboxScriptEngine = NULL;
-    }
 }
 
 void EntityTreeRenderer::clear() {
     leaveAllEntities();
-    foreach (const EntityItemID& entityID, _entityScripts.keys()) {
-        checkAndCallUnload(entityID);
-    }
-    _entityScripts.clear();
+    _entitiesScriptEngine->unloadAllEntityScripts();
 
     auto scene = _viewState->getMain3DScene();
     render::PendingChanges pendingChanges;
@@ -113,10 +100,9 @@ void EntityTreeRenderer::init() {
 
     if (_wantScripts) {
         _entitiesScriptEngine = new ScriptEngine(NO_SCRIPT, "Entities",
-                                        _scriptingServices->getControllerScriptingInterface(), false);
+                                        _scriptingServices->getControllerScriptingInterface());
         _scriptingServices->registerScriptEngineWithApplicationServices(_entitiesScriptEngine);
-
-        _sandboxScriptEngine = new ScriptEngine(NO_SCRIPT, "Entities Sandbox", NULL, false);
+        _entitiesScriptEngine->runInThread();
     }
 
     // make sure our "last avatar position" is something other than our current position, so that on our
@@ -134,176 +120,6 @@ void EntityTreeRenderer::shutdown() {
     _shuttingDown = true;
 }
 
-void EntityTreeRenderer::scriptContentsAvailable(const QUrl& url, const QString& scriptContents) {
-    if (_waitingOnPreload.contains(url)) {
-        QList<EntityItemID> entityIDs = _waitingOnPreload.values(url);
-        _waitingOnPreload.remove(url);
-        foreach(EntityItemID entityID, entityIDs) {
-            checkAndCallPreload(entityID);
-        }
-    }
-}
-
-void EntityTreeRenderer::errorInLoadingScript(const QUrl& url) {
-    if (_waitingOnPreload.contains(url)) {
-        _waitingOnPreload.remove(url);
-    }
-}
-
-QScriptValue EntityTreeRenderer::loadEntityScript(const EntityItemID& entityItemID, bool isPreload, bool reload) {
-    EntityItemPointer entity = std::static_pointer_cast<EntityTree>(_tree)->findEntityByEntityItemID(entityItemID);
-    return loadEntityScript(entity, isPreload, reload);
-}
-
-
-QString EntityTreeRenderer::loadScriptContents(const QString& scriptMaybeURLorText, bool& isURL, bool& isPending, QUrl& urlOut,
-        bool& reload) {
-    isPending = false;
-    QUrl url(scriptMaybeURLorText);
-    
-    // If the url is not valid, this must be script text...
-    // We document "direct injection" scripts as starting with "(function...", and that would never be a valid url.
-    // But QUrl thinks it is.
-    if (!url.isValid() || scriptMaybeURLorText.startsWith("(")) {
-        isURL = false;
-        return scriptMaybeURLorText;
-    }
-    isURL = true;
-    urlOut = url;
-
-    QString scriptContents; // assume empty
-    
-    // if the scheme length is one or lower, maybe they typed in a file, let's try
-    const int WINDOWS_DRIVE_LETTER_SIZE = 1;
-    if (url.scheme().size() <= WINDOWS_DRIVE_LETTER_SIZE) {
-        url = QUrl::fromLocalFile(scriptMaybeURLorText);
-    }
-
-    // ok, let's see if it's valid... and if so, load it
-    if (url.isValid()) {
-        if (url.scheme() == "file") {
-            QString fileName = url.toLocalFile();
-            QFile scriptFile(fileName);
-            if (scriptFile.open(QFile::ReadOnly | QFile::Text)) {
-                qCDebug(entitiesrenderer) << "Loading file:" << fileName;
-                QTextStream in(&scriptFile);
-                scriptContents = in.readAll();
-            } else {
-                qCDebug(entitiesrenderer) << "ERROR Loading file:" << fileName;
-            }
-        } else {
-            auto scriptCache = DependencyManager::get<ScriptCache>();
-            
-            if (!scriptCache->isInBadScriptList(url)) {
-                scriptContents = scriptCache->getScript(url, this, isPending, reload);
-            }
-        }
-    }
-    
-    return scriptContents;
-}
-
-
-QScriptValue EntityTreeRenderer::loadEntityScript(EntityItemPointer entity, bool isPreload, bool reload) {
-    if (_shuttingDown) {
-        return QScriptValue(); // since we're shutting down, we don't load any more scripts
-    }
-    
-    if (!entity) {
-        return QScriptValue(); // no entity...
-    }
-    
-    // NOTE: we keep local variables for the entityID and the script because
-    // below in loadScriptContents() it's possible for us to execute the
-    // application event loop, which may cause our entity to be deleted on
-    // us. We don't really need access the entity after this point, can
-    // can accomplish all we need to here with just the script "text" and the ID.
-    EntityItemID entityID = entity->getEntityItemID();
-    QString entityScript = entity->getScript();
-
-    if (_entityScripts.contains(entityID)) {
-        EntityScriptDetails details = _entityScripts[entityID];
-        
-        // check to make sure our script text hasn't changed on us since we last loaded it and we're not redownloading it
-        if (details.scriptText == entityScript && !reload) {
-            return details.scriptObject; // previously loaded
-        }
-        
-        // if we got here, then we previously loaded a script, but the entity's script value
-        // has changed and so we need to reload it.
-        _entityScripts.remove(entityID);
-    }
-    if (entityScript.isEmpty()) {
-        return QScriptValue(); // no script
-    }
-    
-    bool isURL = false; // loadScriptContents() will tell us if this is a URL or just text.
-    bool isPending = false;
-    QUrl url;
-    QString scriptContents = loadScriptContents(entityScript, isURL, isPending, url, reload);
-    
-    if (isPending && isPreload && isURL) {
-        _waitingOnPreload.insert(url, entityID);
-    }
-
-    auto scriptCache = DependencyManager::get<ScriptCache>();
-
-    if (isURL && scriptCache->isInBadScriptList(url)) {
-        return QScriptValue(); // no script contents...
-    }
-    
-    if (scriptContents.isEmpty()) {
-        return QScriptValue(); // no script contents...
-    }
-    
-    QScriptSyntaxCheckResult syntaxCheck = QScriptEngine::checkSyntax(scriptContents);
-    if (syntaxCheck.state() != QScriptSyntaxCheckResult::Valid) {
-        qCDebug(entitiesrenderer) << "EntityTreeRenderer::loadEntityScript() entity:" << entityID;
-        qCDebug(entitiesrenderer) << "   " << syntaxCheck.errorMessage() << ":"
-                          << syntaxCheck.errorLineNumber() << syntaxCheck.errorColumnNumber();
-        qCDebug(entitiesrenderer) << "    SCRIPT:" << entityScript;
-
-        scriptCache->addScriptToBadScriptList(url);
-        
-        return QScriptValue(); // invalid script
-    }
-    
-    if (isURL) {
-        _entitiesScriptEngine->setParentURL(entity->getScript());
-    }
-    QScriptValue entityScriptConstructor = _sandboxScriptEngine->evaluate(scriptContents);
-    
-    if (!entityScriptConstructor.isFunction()) {
-        qCDebug(entitiesrenderer) << "EntityTreeRenderer::loadEntityScript() entity:" << entityID;
-        qCDebug(entitiesrenderer) << "    NOT CONSTRUCTOR";
-        qCDebug(entitiesrenderer) << "    SCRIPT:" << entityScript;
-
-        scriptCache->addScriptToBadScriptList(url);
-
-        return QScriptValue(); // invalid script
-    } else {
-        entityScriptConstructor = _entitiesScriptEngine->evaluate(scriptContents);
-    }
-
-    QScriptValue entityScriptObject = entityScriptConstructor.construct();
-    EntityScriptDetails newDetails = { entityScript, entityScriptObject };
-    _entityScripts[entityID] = newDetails;
-
-    if (isURL) {
-        _entitiesScriptEngine->setParentURL("");
-    }
-
-    return entityScriptObject; // newly constructed
-}
-
-QScriptValue EntityTreeRenderer::getPreviouslyLoadedEntityScript(const EntityItemID& entityID) {
-    if (_entityScripts.contains(entityID)) {
-        EntityScriptDetails details = _entityScripts[entityID];
-        return details.scriptObject; // previously loaded
-    }
-    return QScriptValue(); // no script
-}
-
 void EntityTreeRenderer::setTree(OctreePointer newTree) {
     OctreeRenderer::setTree(newTree);
     std::static_pointer_cast<EntityTree>(_tree)->setFBXService(this);
@@ -322,11 +138,7 @@ void EntityTreeRenderer::update() {
         // and we want to simulate this message here as well as in mouse move
         if (_lastMouseEventValid && !_currentClickingOnEntityID.isInvalidID()) {
             emit holdingClickOnEntity(_currentClickingOnEntityID, _lastMouseEvent);
-            QScriptValueList currentClickingEntityArgs = createMouseEventArgs(_currentClickingOnEntityID, _lastMouseEvent);
-            QScriptValue currentClickingEntity = loadEntityScript(_currentClickingOnEntityID);
-            if (currentClickingEntity.property("holdingClickOnEntity").isValid()) {
-                currentClickingEntity.property("holdingClickOnEntity").call(currentClickingEntity, currentClickingEntityArgs);
-            }
+            _entitiesScriptEngine->callEntityScriptMethod(_currentClickingOnEntityID, "holdingClickOnEntity", _lastMouseEvent);
         }
 
     }
@@ -355,19 +167,14 @@ void EntityTreeRenderer::checkEnterLeaveEntities() {
             });
             
             // Note: at this point we don't need to worry about the tree being locked, because we only deal with
-            // EntityItemIDs from here. The loadEntityScript() method is robust against attempting to load scripts
+            // EntityItemIDs from here. The callEntityScriptMethod() method is robust against attempting to call scripts
             // for entity IDs that no longer exist.
 
             // for all of our previous containing entities, if they are no longer containing then send them a leave event
             foreach(const EntityItemID& entityID, _currentEntitiesInside) {
                 if (!entitiesContainingAvatar.contains(entityID)) {
                     emit leaveEntity(entityID);
-                    QScriptValueList entityArgs = createEntityArgs(entityID);
-                    QScriptValue entityScript = loadEntityScript(entityID);
-                    if (entityScript.property("leaveEntity").isValid()) {
-                        entityScript.property("leaveEntity").call(entityScript, entityArgs);
-                    }
-
+                    _entitiesScriptEngine->callEntityScriptMethod(entityID, "leaveEntity");
                 }
             }
 
@@ -375,11 +182,7 @@ void EntityTreeRenderer::checkEnterLeaveEntities() {
             foreach(const EntityItemID& entityID, entitiesContainingAvatar) {
                 if (!_currentEntitiesInside.contains(entityID)) {
                     emit enterEntity(entityID);
-                    QScriptValueList entityArgs = createEntityArgs(entityID);
-                    QScriptValue entityScript = loadEntityScript(entityID);
-                    if (entityScript.property("enterEntity").isValid()) {
-                        entityScript.property("enterEntity").call(entityScript, entityArgs);
-                    }
+                    _entitiesScriptEngine->callEntityScriptMethod(entityID, "enterEntity");
                 }
             }
             _currentEntitiesInside = entitiesContainingAvatar;
@@ -394,11 +197,7 @@ void EntityTreeRenderer::leaveAllEntities() {
         // for all of our previous containing entities, if they are no longer containing then send them a leave event
         foreach(const EntityItemID& entityID, _currentEntitiesInside) {
             emit leaveEntity(entityID);
-            QScriptValueList entityArgs = createEntityArgs(entityID);
-            QScriptValue entityScript = loadEntityScript(entityID);
-            if (entityScript.property("leaveEntity").isValid()) {
-                entityScript.property("leaveEntity").call(entityScript, entityArgs);
-            }
+            _entitiesScriptEngine->callEntityScriptMethod(entityID, "leaveEntity");
         }
         _currentEntitiesInside.clear();
         
@@ -811,27 +610,6 @@ void EntityTreeRenderer::connectSignalsToSlots(EntityScriptingInterface* entityS
     connect(DependencyManager::get<SceneScriptingInterface>().data(), &SceneScriptingInterface::shouldRenderEntitiesChanged, this, &EntityTreeRenderer::updateEntityRenderStatus, Qt::QueuedConnection);
 }
 
-QScriptValueList EntityTreeRenderer::createMouseEventArgs(const EntityItemID& entityID, QMouseEvent* event, unsigned int deviceID) {
-    QScriptValueList args;
-    args << entityID.toScriptValue(_entitiesScriptEngine);
-    args << MouseEvent(*event, deviceID).toScriptValue(_entitiesScriptEngine);
-    return args;
-}
-
-QScriptValueList EntityTreeRenderer::createMouseEventArgs(const EntityItemID& entityID, const MouseEvent& mouseEvent) {
-    QScriptValueList args;
-    args << entityID.toScriptValue(_entitiesScriptEngine);
-    args << mouseEvent.toScriptValue(_entitiesScriptEngine);
-    return args;
-}
-
-
-QScriptValueList EntityTreeRenderer::createEntityArgs(const EntityItemID& entityID) {
-    QScriptValueList args;
-    args << entityID.toScriptValue(_entitiesScriptEngine);
-    return args;
-}
-
 void EntityTreeRenderer::mousePressEvent(QMouseEvent* event, unsigned int deviceID) {
     // If we don't have a tree, or we're in the process of shutting down, then don't
     // process these events.
@@ -854,18 +632,11 @@ void EntityTreeRenderer::mousePressEvent(QMouseEvent* event, unsigned int device
         }
 
         emit mousePressOnEntity(rayPickResult, event, deviceID);
-
-        QScriptValueList entityScriptArgs = createMouseEventArgs(rayPickResult.entityID, event, deviceID);
-        QScriptValue entityScript = loadEntityScript(rayPickResult.entity);
-        if (entityScript.property("mousePressOnEntity").isValid()) {
-            entityScript.property("mousePressOnEntity").call(entityScript, entityScriptArgs);
-        }
+        _entitiesScriptEngine->callEntityScriptMethod(rayPickResult.entityID, "mousePressOnEntity", MouseEvent(*event, deviceID));
     
         _currentClickingOnEntityID = rayPickResult.entityID;
         emit clickDownOnEntity(_currentClickingOnEntityID, MouseEvent(*event, deviceID));
-        if (entityScript.property("clickDownOnEntity").isValid()) {
-            entityScript.property("clickDownOnEntity").call(entityScript, entityScriptArgs);
-        }
+        _entitiesScriptEngine->callEntityScriptMethod(_currentClickingOnEntityID, "clickDownOnEntity", MouseEvent(*event, deviceID));
     } else {
         emit mousePressOffEntity(rayPickResult, event, deviceID);
     }
@@ -886,24 +657,14 @@ void EntityTreeRenderer::mouseReleaseEvent(QMouseEvent* event, unsigned int devi
     if (rayPickResult.intersects) {
         //qCDebug(entitiesrenderer) << "mouseReleaseEvent over entity:" << rayPickResult.entityID;
         emit mouseReleaseOnEntity(rayPickResult, event, deviceID);
-
-        QScriptValueList entityScriptArgs = createMouseEventArgs(rayPickResult.entityID, event, deviceID);
-        QScriptValue entityScript = loadEntityScript(rayPickResult.entity);
-        if (entityScript.property("mouseReleaseOnEntity").isValid()) {
-            entityScript.property("mouseReleaseOnEntity").call(entityScript, entityScriptArgs);
-        }
+        _entitiesScriptEngine->callEntityScriptMethod(rayPickResult.entityID, "mouseReleaseOnEntity", MouseEvent(*event, deviceID));
     }
 
     // Even if we're no longer intersecting with an entity, if we started clicking on it, and now
     // we're releasing the button, then this is considered a clickOn event
     if (!_currentClickingOnEntityID.isInvalidID()) {
         emit clickReleaseOnEntity(_currentClickingOnEntityID, MouseEvent(*event, deviceID));
-
-        QScriptValueList currentClickingEntityArgs = createMouseEventArgs(_currentClickingOnEntityID, event, deviceID);
-        QScriptValue currentClickingEntity = loadEntityScript(_currentClickingOnEntityID);
-        if (currentClickingEntity.property("clickReleaseOnEntity").isValid()) {
-            currentClickingEntity.property("clickReleaseOnEntity").call(currentClickingEntity, currentClickingEntityArgs);
-        }
+        _entitiesScriptEngine->callEntityScriptMethod(rayPickResult.entityID, "clickReleaseOnEntity", MouseEvent(*event, deviceID));
     }
 
     // makes it the unknown ID, we just released so we can't be clicking on anything
@@ -925,17 +686,9 @@ void EntityTreeRenderer::mouseMoveEvent(QMouseEvent* event, unsigned int deviceI
     bool precisionPicking = false; // for mouse moves we do not do precision picking
     RayToEntityIntersectionResult rayPickResult = findRayIntersectionWorker(ray, Octree::TryLock, precisionPicking);
     if (rayPickResult.intersects) {
-        //qCDebug(entitiesrenderer) << "mouseReleaseEvent over entity:" << rayPickResult.entityID;
-        QScriptValueList entityScriptArgs = createMouseEventArgs(rayPickResult.entityID, event, deviceID);
-        // load the entity script if needed...
-        QScriptValue entityScript = loadEntityScript(rayPickResult.entity);
-        if (entityScript.property("mouseMoveEvent").isValid()) {
-            entityScript.property("mouseMoveEvent").call(entityScript, entityScriptArgs);
-        }
-        emit mouseMoveOnEntity(rayPickResult, event, deviceID);
-        if (entityScript.property("mouseMoveOnEntity").isValid()) {
-            entityScript.property("mouseMoveOnEntity").call(entityScript, entityScriptArgs);
-        }
+
+        _entitiesScriptEngine->callEntityScriptMethod(rayPickResult.entityID, "mouseMoveEvent", MouseEvent(*event, deviceID));
+        _entitiesScriptEngine->callEntityScriptMethod(rayPickResult.entityID, "mouseMoveOnEntity", MouseEvent(*event, deviceID));
     
         // handle the hover logic...
     
@@ -943,30 +696,19 @@ void EntityTreeRenderer::mouseMoveEvent(QMouseEvent* event, unsigned int deviceI
         // then we need to send the hover leave.
         if (!_currentHoverOverEntityID.isInvalidID() && rayPickResult.entityID != _currentHoverOverEntityID) {
             emit hoverLeaveEntity(_currentHoverOverEntityID, MouseEvent(*event, deviceID));
-
-            QScriptValueList currentHoverEntityArgs = createMouseEventArgs(_currentHoverOverEntityID, event, deviceID);
-
-            QScriptValue currentHoverEntity = loadEntityScript(_currentHoverOverEntityID);
-            if (currentHoverEntity.property("hoverLeaveEntity").isValid()) {
-                currentHoverEntity.property("hoverLeaveEntity").call(currentHoverEntity, currentHoverEntityArgs);
-            }
+            _entitiesScriptEngine->callEntityScriptMethod(_currentHoverOverEntityID, "hoverLeaveEntity", MouseEvent(*event, deviceID));
         }
 
         // If the new hover entity does not match the previous hover entity then we are entering the new one
         // this is true if the _currentHoverOverEntityID is known or unknown
         if (rayPickResult.entityID != _currentHoverOverEntityID) {
-            emit hoverEnterEntity(rayPickResult.entityID, MouseEvent(*event, deviceID));
-            if (entityScript.property("hoverEnterEntity").isValid()) {
-                entityScript.property("hoverEnterEntity").call(entityScript, entityScriptArgs);
-            }
+            _entitiesScriptEngine->callEntityScriptMethod(rayPickResult.entityID, "hoverEnterEntity", MouseEvent(*event, deviceID));
         }
 
         // and finally, no matter what, if we're intersecting an entity then we're definitely hovering over it, and
         // we should send our hover over event
         emit hoverOverEntity(rayPickResult.entityID, MouseEvent(*event, deviceID));
-        if (entityScript.property("hoverOverEntity").isValid()) {
-            entityScript.property("hoverOverEntity").call(entityScript, entityScriptArgs);
-        }
+        _entitiesScriptEngine->callEntityScriptMethod(rayPickResult.entityID, "hoverOverEntity", MouseEvent(*event, deviceID));
 
         // remember what we're hovering over
         _currentHoverOverEntityID = rayPickResult.entityID;
@@ -977,14 +719,7 @@ void EntityTreeRenderer::mouseMoveEvent(QMouseEvent* event, unsigned int deviceI
         // send the hover leave for our previous entity
         if (!_currentHoverOverEntityID.isInvalidID()) {
             emit hoverLeaveEntity(_currentHoverOverEntityID, MouseEvent(*event, deviceID));
-
-            QScriptValueList currentHoverEntityArgs = createMouseEventArgs(_currentHoverOverEntityID, event, deviceID);
-
-            QScriptValue currentHoverEntity = loadEntityScript(_currentHoverOverEntityID);
-            if (currentHoverEntity.property("hoverLeaveEntity").isValid()) {
-                currentHoverEntity.property("hoverLeaveEntity").call(currentHoverEntity, currentHoverEntityArgs);
-            }
-
+            _entitiesScriptEngine->callEntityScriptMethod(_currentHoverOverEntityID, "hoverLeaveEntity", MouseEvent(*event, deviceID));
             _currentHoverOverEntityID = UNKNOWN_ENTITY_ID; // makes it the unknown ID
         }
     }
@@ -993,13 +728,7 @@ void EntityTreeRenderer::mouseMoveEvent(QMouseEvent* event, unsigned int deviceI
     // not yet released the hold then this is still considered a holdingClickOnEntity event
     if (!_currentClickingOnEntityID.isInvalidID()) {
         emit holdingClickOnEntity(_currentClickingOnEntityID, MouseEvent(*event, deviceID));
-
-        QScriptValueList currentClickingEntityArgs = createMouseEventArgs(_currentClickingOnEntityID, event, deviceID);
-
-        QScriptValue currentClickingEntity = loadEntityScript(_currentClickingOnEntityID);
-        if (currentClickingEntity.property("holdingClickOnEntity").isValid()) {
-            currentClickingEntity.property("holdingClickOnEntity").call(currentClickingEntity, currentClickingEntityArgs);
-        }
+        _entitiesScriptEngine->callEntityScriptMethod(_currentClickingOnEntityID, "holdingClickOnEntity", MouseEvent(*event, deviceID));
     }
     _lastMouseEvent = MouseEvent(*event, deviceID);
     _lastMouseEventValid = true;
@@ -1007,9 +736,8 @@ void EntityTreeRenderer::mouseMoveEvent(QMouseEvent* event, unsigned int deviceI
 
 void EntityTreeRenderer::deletingEntity(const EntityItemID& entityID) {
     if (_tree && !_shuttingDown) {
-        checkAndCallUnload(entityID);
+        _entitiesScriptEngine->unloadEntityScript(entityID);
     }
-    _entityScripts.remove(entityID);
 
     // here's where we remove the entity payload from the scene
     if (_entitiesInScene.contains(entityID)) {
@@ -1042,28 +770,16 @@ void EntityTreeRenderer::addEntityToScene(EntityItemPointer entity) {
 
 void EntityTreeRenderer::entitySciptChanging(const EntityItemID& entityID, const bool reload) {
     if (_tree && !_shuttingDown) {
-        checkAndCallUnload(entityID);
+        _entitiesScriptEngine->unloadEntityScript(entityID);
         checkAndCallPreload(entityID, reload);
     }
 }
 
 void EntityTreeRenderer::checkAndCallPreload(const EntityItemID& entityID, const bool reload) {
     if (_tree && !_shuttingDown) {
-        // load the entity script if needed...
-        QScriptValue entityScript = loadEntityScript(entityID, true, reload); // is preload!
-        if (entityScript.property("preload").isValid()) {
-            QScriptValueList entityArgs = createEntityArgs(entityID);
-            entityScript.property("preload").call(entityScript, entityArgs);
-        }
-    }
-}
-
-void EntityTreeRenderer::checkAndCallUnload(const EntityItemID& entityID) {
-    if (_tree && !_shuttingDown) {
-        QScriptValue entityScript = getPreviouslyLoadedEntityScript(entityID);
-        if (entityScript.property("unload").isValid()) {
-            QScriptValueList entityArgs = createEntityArgs(entityID);
-            entityScript.property("unload").call(entityScript, entityArgs);
+        EntityItemPointer entity = getTree()->findEntityByEntityItemID(entityID);
+        if (entity && !entity->getScript().isEmpty()) {
+            _entitiesScriptEngine->loadEntityScript(entityID, entity->getScript(), reload);
         }
     }
 }
@@ -1143,24 +859,9 @@ void EntityTreeRenderer::entityCollisionWithEntity(const EntityItemID& idA, cons
 
     // And now the entity scripts
     emit collisionWithEntity(idA, idB, collision);
-    QScriptValue entityScriptA = loadEntityScript(idA);
-    if (entityScriptA.property("collisionWithEntity").isValid()) {
-        QScriptValueList args;
-        args << idA.toScriptValue(_entitiesScriptEngine);
-        args << idB.toScriptValue(_entitiesScriptEngine);
-        args << collisionToScriptValue(_entitiesScriptEngine, collision);
-        entityScriptA.property("collisionWithEntity").call(entityScriptA, args);
-    }
-
+    _entitiesScriptEngine->callEntityScriptMethod(idA, "collisionWithEntity", idB, collision);
     emit collisionWithEntity(idB, idA, collision);
-    QScriptValue entityScriptB = loadEntityScript(idB);
-    if (entityScriptB.property("collisionWithEntity").isValid()) {
-        QScriptValueList args;
-        args << idB.toScriptValue(_entitiesScriptEngine);
-        args << idA.toScriptValue(_entitiesScriptEngine);
-        args << collisionToScriptValue(_entitiesScriptEngine, collision);
-        entityScriptB.property("collisionWithEntity").call(entityScriptA, args);
-    }
+    _entitiesScriptEngine->callEntityScriptMethod(idB, "collisionWithEntity", idA, collision);
 }
 
 void EntityTreeRenderer::updateEntityRenderStatus(bool shouldRenderEntities) {
diff --git a/libraries/entities-renderer/src/EntityTreeRenderer.h b/libraries/entities-renderer/src/EntityTreeRenderer.h
index f568618651..a2f343efd2 100644
--- a/libraries/entities-renderer/src/EntityTreeRenderer.h
+++ b/libraries/entities-renderer/src/EntityTreeRenderer.h
@@ -28,14 +28,9 @@ class Model;
 class ScriptEngine;
 class ZoneEntityItem;
 
-class EntityScriptDetails {
-public:
-    QString scriptText;
-    QScriptValue scriptObject;
-};
 
 // Generic client side Octree renderer class.
-class EntityTreeRenderer : public OctreeRenderer, public EntityItemFBXService, public ScriptUser {
+class EntityTreeRenderer : public OctreeRenderer, public EntityItemFBXService {
     Q_OBJECT
 public:
     EntityTreeRenderer(bool wantScripts, AbstractViewStateInterface* viewState,
@@ -87,9 +82,6 @@ public:
     /// hovering over, and entering entities
     void connectSignalsToSlots(EntityScriptingInterface* entityScriptingInterface);
 
-    virtual void scriptContentsAvailable(const QUrl& url, const QString& scriptContents);
-    virtual void errorInLoadingScript(const QUrl& url);
-
     // For Scene.shouldRenderEntities
     QList<EntityItemID>& getEntitiesLastInScene() { return _entityIDsLastInScene; }
 
@@ -137,7 +129,6 @@ private:
     void applyZonePropertiesToScene(std::shared_ptr<ZoneEntityItem> zone);
     void renderElementProxy(EntityTreeElementPointer entityTreeElement, RenderArgs* args);
     void checkAndCallPreload(const EntityItemID& entityID, const bool reload = false);
-    void checkAndCallUnload(const EntityItemID& entityID);
 
     QList<Model*> _releasedModels;
     void renderProxies(EntityItemPointer entity, RenderArgs* args);
@@ -155,16 +146,6 @@ private:
     
     bool _wantScripts;
     ScriptEngine* _entitiesScriptEngine;
-    ScriptEngine* _sandboxScriptEngine;
-
-    QScriptValue loadEntityScript(EntityItemPointer entity, bool isPreload = false, bool reload = false);
-    QScriptValue loadEntityScript(const EntityItemID& entityItemID, bool isPreload = false, bool reload = false);
-    QScriptValue getPreviouslyLoadedEntityScript(const EntityItemID& entityItemID);
-    QString loadScriptContents(const QString& scriptMaybeURLorText, bool& isURL, bool& isPending, QUrl& url, bool& reload);
-    QScriptValueList createMouseEventArgs(const EntityItemID& entityID, QMouseEvent* event, unsigned int deviceID);
-    QScriptValueList createMouseEventArgs(const EntityItemID& entityID, const MouseEvent& mouseEvent);
-    
-    QHash<EntityItemID, EntityScriptDetails> _entityScripts;
 
     void playEntityCollisionSound(const QUuid& myNodeID, EntityTreePointer entityTree,
                                   const EntityItemID& id, const Collision& collision);
diff --git a/libraries/networking/src/ResourceManager.cpp b/libraries/networking/src/ResourceManager.cpp
index 8af33c5463..774664f2c8 100644
--- a/libraries/networking/src/ResourceManager.cpp
+++ b/libraries/networking/src/ResourceManager.cpp
@@ -17,21 +17,31 @@
 
 #include <SharedUtil.h>
 
-ResourceRequest* ResourceManager::createResourceRequest(QObject* parent, const QUrl& url) {
+QUrl ResourceManager::normalizeURL(const QUrl& url) {
     auto scheme = url.scheme();
+    if (!(scheme == URL_SCHEME_FILE ||
+          scheme == URL_SCHEME_HTTP || scheme == URL_SCHEME_HTTPS || scheme == URL_SCHEME_FTP ||
+          scheme == URL_SCHEME_ATP)) {
+
+        // check the degenerative file case: on windows we can often have urls of the form c:/filename
+        // this checks for and works around that case.
+        QUrl urlWithFileScheme{ URL_SCHEME_FILE + ":///" + url.toString() };
+        if (!urlWithFileScheme.toLocalFile().isEmpty()) {
+            return urlWithFileScheme;
+        }
+    }
+    return url;
+}
+
+ResourceRequest* ResourceManager::createResourceRequest(QObject* parent, const QUrl& url) {
+    auto normalizedURL = normalizeURL(url);
+    auto scheme = normalizedURL.scheme();
     if (scheme == URL_SCHEME_FILE) {
         return new FileResourceRequest(parent, url);
     } else if (scheme == URL_SCHEME_HTTP || scheme == URL_SCHEME_HTTPS || scheme == URL_SCHEME_FTP) {
         return new HTTPResourceRequest(parent, url);
     } else if (scheme == URL_SCHEME_ATP) {
         return new AssetResourceRequest(parent, url);
-    } else {
-        // check the degenerative file case: on windows we can often have urls of the form c:/filename
-        // this checks for and works around that case.
-        QUrl urlWithFileScheme { URL_SCHEME_FILE + ":///" + url.toString() };
-        if (!urlWithFileScheme.toLocalFile().isEmpty()) {
-            return new FileResourceRequest(parent, urlWithFileScheme);
-        }
     }
 
     qDebug() << "Unknown scheme (" << scheme << ") for URL: " << url.url();
diff --git a/libraries/networking/src/ResourceManager.h b/libraries/networking/src/ResourceManager.h
index 3748036c8e..40b67b1cd1 100644
--- a/libraries/networking/src/ResourceManager.h
+++ b/libraries/networking/src/ResourceManager.h
@@ -24,6 +24,7 @@ const QString URL_SCHEME_ATP = "atp";
 
 class ResourceManager {
 public:
+    static QUrl normalizeURL(const QUrl& url);
     static ResourceRequest* createResourceRequest(QObject* parent, const QUrl& url);
 };
 
diff --git a/libraries/networking/src/ThreadedAssignment.cpp b/libraries/networking/src/ThreadedAssignment.cpp
index a5df256e29..aee2805f32 100644
--- a/libraries/networking/src/ThreadedAssignment.cpp
+++ b/libraries/networking/src/ThreadedAssignment.cpp
@@ -65,7 +65,7 @@ void ThreadedAssignment::commonInit(const QString& targetName, NodeType_t nodeTy
     auto nodeList = DependencyManager::get<NodeList>();
     nodeList->setOwnerType(nodeType);
 
-    _domainServerTimer = new QTimer();
+    _domainServerTimer = new QTimer(this);
     connect(_domainServerTimer, SIGNAL(timeout()), this, SLOT(checkInWithDomainServerOrExit()));
     _domainServerTimer->start(DOMAIN_SERVER_CHECK_IN_MSECS);
 
diff --git a/libraries/networking/src/udt/CongestionControl.cpp b/libraries/networking/src/udt/CongestionControl.cpp
index 2240f2c193..ea46d60acb 100644
--- a/libraries/networking/src/udt/CongestionControl.cpp
+++ b/libraries/networking/src/udt/CongestionControl.cpp
@@ -34,7 +34,6 @@ void CongestionControl::setPacketSendPeriod(double newSendPeriod) {
 }
 
 DefaultCC::DefaultCC() :
-    _lastRCTime(p_high_resolution_clock::now()),
     _slowStartLastAck(_sendCurrSeqNum),
     _lastDecreaseMaxSeq(SequenceNumber {SequenceNumber::MAX })
 {
diff --git a/libraries/networking/src/udt/CongestionControl.h b/libraries/networking/src/udt/CongestionControl.h
index adbf1f0e85..fa1bf73ecf 100644
--- a/libraries/networking/src/udt/CongestionControl.h
+++ b/libraries/networking/src/udt/CongestionControl.h
@@ -108,7 +108,8 @@ public:
 private:
     void stopSlowStart(); // stops the slow start on loss or timeout
     
-    p_high_resolution_clock::time_point _lastRCTime; // last rate increase time
+    p_high_resolution_clock::time_point _lastRCTime = p_high_resolution_clock::now(); // last rate increase time
+    
     bool _slowStart { true };	// if in slow start phase
     SequenceNumber _slowStartLastAck; // last ACKed seq num
     bool _loss { false };	// if loss happened since last rate increase
diff --git a/libraries/networking/src/udt/Connection.cpp b/libraries/networking/src/udt/Connection.cpp
index 21dce2831c..2fb28f81ee 100644
--- a/libraries/networking/src/udt/Connection.cpp
+++ b/libraries/networking/src/udt/Connection.cpp
@@ -28,7 +28,6 @@ using namespace udt;
 using namespace std::chrono;
 
 Connection::Connection(Socket* parentSocket, HifiSockAddr destination, std::unique_ptr<CongestionControl> congestionControl) :
-    _connectionStart(p_high_resolution_clock::now()),
     _parentSocket(parentSocket),
     _destination(destination),
     _congestionControl(move(congestionControl))
@@ -278,11 +277,11 @@ void Connection::sendACK(bool wasCausedBySyncTimeout) {
         // pack in the receive speed and estimatedBandwidth
         ackPacket->writePrimitive(packetReceiveSpeed);
         ackPacket->writePrimitive(estimatedBandwidth);
-        
-        // record this as the last ACK send time
-        lastACKSendTime = p_high_resolution_clock::now();
     }
     
+    // record this as the last ACK send time
+    lastACKSendTime = p_high_resolution_clock::now();
+    
     // have the socket send off our packet
     _parentSocket->writeBasePacket(*ackPacket, _destination);
     
@@ -534,7 +533,8 @@ void Connection::processACK(std::unique_ptr<ControlPacket> controlPacket) {
     // This will be the case if it has been longer than the sync interval OR
     // it looks like they haven't received our ACK2 for this ACK
     auto currentTime = p_high_resolution_clock::now();
-    static p_high_resolution_clock::time_point lastACK2SendTime;
+    static p_high_resolution_clock::time_point lastACK2SendTime =
+        p_high_resolution_clock::now() - std::chrono::microseconds(_synInterval);
     
     microseconds sinceLastACK2 = duration_cast<microseconds>(currentTime - lastACK2SendTime);
     
@@ -779,7 +779,7 @@ void Connection::resetReceiveState() {
     
     // clear the loss list and _lastNAKTime
     _lossList.clear();
-    _lastNAKTime = p_high_resolution_clock::time_point();
+    _lastNAKTime = p_high_resolution_clock::now();
     
     // the _nakInterval need not be reset, that will happen on loss
     
diff --git a/libraries/networking/src/udt/Connection.h b/libraries/networking/src/udt/Connection.h
index 31ef664ce5..2b1dec1ae9 100644
--- a/libraries/networking/src/udt/Connection.h
+++ b/libraries/networking/src/udt/Connection.h
@@ -114,13 +114,14 @@ private:
     
     int _nakInterval { -1 }; // NAK timeout interval, in microseconds, set on loss
     int _minNAKInterval { 100000 }; // NAK timeout interval lower bound, default of 100ms
-    p_high_resolution_clock::time_point _lastNAKTime;
+    p_high_resolution_clock::time_point _lastNAKTime = p_high_resolution_clock::now();
     
     bool _hasReceivedHandshake { false }; // flag for receipt of handshake from server
     bool _hasReceivedHandshakeACK { false }; // flag for receipt of handshake ACK from client
    
-    p_high_resolution_clock::time_point _connectionStart; // holds the time_point for creation of this connection
+    p_high_resolution_clock::time_point _connectionStart = p_high_resolution_clock::now(); // holds the time_point for creation of this connection
     p_high_resolution_clock::time_point _lastReceiveTime; // holds the last time we received anything from sender
+    
     bool _isReceivingData { false }; // flag used for expiry of receipt portion of connection
     
     LossList _lossList; // List of all missing packets
diff --git a/libraries/networking/src/udt/PacketTimeWindow.cpp b/libraries/networking/src/udt/PacketTimeWindow.cpp
index 51bba2c52c..0c95d21bc6 100644
--- a/libraries/networking/src/udt/PacketTimeWindow.cpp
+++ b/libraries/networking/src/udt/PacketTimeWindow.cpp
@@ -93,15 +93,16 @@ int32_t PacketTimeWindow::getEstimatedBandwidth() const {
 }
 
 void PacketTimeWindow::onPacketArrival() {
+    
     // take the current time
     auto now = p_high_resolution_clock::now();
     
-    // record the interval between this packet and the last one
-    _packetIntervals[_currentPacketInterval++] = duration_cast<microseconds>(now - _lastPacketTime).count();
-    
-    // reset the currentPacketInterval index when it wraps
-    if (_currentPacketInterval == _numPacketIntervals) {
-        _currentPacketInterval = 0;
+    if (_packetIntervals.size() > 0) {
+        // record the interval between this packet and the last one
+        _packetIntervals[_currentPacketInterval++] = duration_cast<microseconds>(now - _lastPacketTime).count();
+        
+        // reset the currentPacketInterval index when it wraps
+        _currentPacketInterval %= _numPacketIntervals;
     }
     
     // remember this as the last packet arrival time
@@ -120,7 +121,5 @@ void PacketTimeWindow::onProbePair2Arrival() {
     _probeIntervals[_currentProbeInterval++] = duration_cast<microseconds>(now - _firstProbeTime).count();
     
     // reset the currentProbeInterval index when it wraps
-    if (_currentProbeInterval == _numProbeIntervals) {
-        _currentProbeInterval = 0;
-    }
+    _currentProbeInterval %= _numProbeIntervals;
 }
diff --git a/libraries/networking/src/udt/PacketTimeWindow.h b/libraries/networking/src/udt/PacketTimeWindow.h
index c2a90d0f6c..6f7ed9f70f 100644
--- a/libraries/networking/src/udt/PacketTimeWindow.h
+++ b/libraries/networking/src/udt/PacketTimeWindow.h
@@ -42,8 +42,8 @@ private:
     std::vector<int> _packetIntervals; // vector of microsecond intervals between packet arrivals
     std::vector<int> _probeIntervals; // vector of microsecond intervals between probe pair arrivals
     
-    p_high_resolution_clock::time_point _lastPacketTime; // the time_point when last packet arrived
-    p_high_resolution_clock::time_point _firstProbeTime; // the time_point when first probe in pair arrived
+    p_high_resolution_clock::time_point _lastPacketTime = p_high_resolution_clock::now(); // the time_point when last packet arrived
+    p_high_resolution_clock::time_point _firstProbeTime = p_high_resolution_clock::now(); // the time_point when first probe in pair arrived
 };
     
 }
diff --git a/libraries/networking/src/udt/SendQueue.cpp b/libraries/networking/src/udt/SendQueue.cpp
index 2890d52c2b..a09ea6ca9a 100644
--- a/libraries/networking/src/udt/SendQueue.cpp
+++ b/libraries/networking/src/udt/SendQueue.cpp
@@ -279,17 +279,13 @@ void SendQueue::run() {
         if (!_hasReceivedHandshakeACK) {
             // we haven't received a handshake ACK from the client
             // if it has been at least 100ms since we last sent a handshake, send another now
-            
-            // hold the time of last send in a static
-            static auto lastSendHandshake = p_high_resolution_clock::time_point();
-            
+
             static const auto HANDSHAKE_RESEND_INTERVAL_MS = std::chrono::milliseconds(100);
             
-            // calculation the duration since the last handshake send
-            auto sinceLastHandshake = std::chrono::duration_cast<std::chrono::milliseconds>(p_high_resolution_clock::now()
-                                                                                            - lastSendHandshake);
+            // hold the time of last send in a static
+            static auto lastSendHandshake = p_high_resolution_clock::now() - HANDSHAKE_RESEND_INTERVAL_MS;
             
-            if (sinceLastHandshake >= HANDSHAKE_RESEND_INTERVAL_MS) {
+            if (p_high_resolution_clock::now() - lastSendHandshake >= HANDSHAKE_RESEND_INTERVAL_MS) {
                 
                 // it has been long enough since last handshake, send another
                 static auto handshakePacket = ControlPacket::create(ControlPacket::Handshake, 0);
@@ -299,9 +295,7 @@ void SendQueue::run() {
             }
             
             // we wait for the ACK or the re-send interval to expire
-            _handshakeACKCondition.wait_until(handshakeLock,
-                                              p_high_resolution_clock::now()
-                                              + HANDSHAKE_RESEND_INTERVAL_MS);
+            _handshakeACKCondition.wait_until(handshakeLock, p_high_resolution_clock::now() + HANDSHAKE_RESEND_INTERVAL_MS);
             
             // Once we're here we've either received the handshake ACK or it's going to be time to re-send a handshake.
             // Either way let's continue processing - no packets will be sent if no handshake ACK has been received.
diff --git a/libraries/networking/src/udt/SendQueue.h b/libraries/networking/src/udt/SendQueue.h
index 401ebd384d..2e7ec90c45 100644
--- a/libraries/networking/src/udt/SendQueue.h
+++ b/libraries/networking/src/udt/SendQueue.h
@@ -45,8 +45,6 @@ class SendQueue : public QObject {
     Q_OBJECT
     
 public:
-    using time_point = p_high_resolution_clock::time_point;
-    
     static std::unique_ptr<SendQueue> create(Socket* socket, HifiSockAddr destination);
     
     void queuePacket(std::unique_ptr<Packet> packet);
diff --git a/libraries/render-utils/src/Model.cpp b/libraries/render-utils/src/Model.cpp
index 4c9279c8fd..a4dc1b1de3 100644
--- a/libraries/render-utils/src/Model.cpp
+++ b/libraries/render-utils/src/Model.cpp
@@ -798,7 +798,7 @@ namespace render {
             return payload->model->renderPart(args, payload->meshIndex, payload->partIndex, payload->transparent);
         }
     }
-
+    
    /* template <> const model::MaterialKey& shapeGetMaterialKey(const MeshPartPayload::Pointer& payload) {
         return payload->model->getPartMaterial(payload->meshIndex, payload->partIndex);
     }*/
@@ -829,6 +829,9 @@ bool Model::addToScene(std::shared_ptr<render::Scene> scene, render::PendingChan
         auto renderData = MeshPartPayload::Pointer(renderItem);
         auto renderPayload = std::make_shared<MeshPartPayload::Payload>(renderData);
         pendingChanges.resetItem(item, renderPayload);
+        pendingChanges.updateItem<MeshPartPayload>(item, [&](MeshPartPayload& data) {
+            data.model->_needsUpdateClusterMatrices = true;
+        });
         _renderItems.insert(item, renderPayload);
         somethingAdded = true;
     }
@@ -838,6 +841,9 @@ bool Model::addToScene(std::shared_ptr<render::Scene> scene, render::PendingChan
         auto renderData = MeshPartPayload::Pointer(renderItem);
         auto renderPayload = std::make_shared<MeshPartPayload::Payload>(renderData);
         pendingChanges.resetItem(item, renderPayload);
+        pendingChanges.updateItem<MeshPartPayload>(item, [&](MeshPartPayload& data) {
+            data.model->_needsUpdateClusterMatrices = true;
+        });
         _renderItems.insert(item, renderPayload);
         somethingAdded = true;
     }
@@ -860,6 +866,9 @@ bool Model::addToScene(std::shared_ptr<render::Scene> scene, render::PendingChan
         auto renderPayload = std::make_shared<MeshPartPayload::Payload>(renderData);
         renderPayload->addStatusGetters(statusGetters);
         pendingChanges.resetItem(item, renderPayload);
+        pendingChanges.updateItem<MeshPartPayload>(item, [&](MeshPartPayload& data) {
+            data.model->_needsUpdateClusterMatrices = true;
+        });
         _renderItems.insert(item, renderPayload);
         somethingAdded = true;
     }
@@ -870,6 +879,9 @@ bool Model::addToScene(std::shared_ptr<render::Scene> scene, render::PendingChan
         auto renderPayload = std::make_shared<MeshPartPayload::Payload>(renderData);
         renderPayload->addStatusGetters(statusGetters);
         pendingChanges.resetItem(item, renderPayload);
+        pendingChanges.updateItem<MeshPartPayload>(item, [&](MeshPartPayload& data) {
+            data.model->_needsUpdateClusterMatrices = true;
+        });
         _renderItems.insert(item, renderPayload);
         somethingAdded = true;
     }
@@ -1283,6 +1295,7 @@ void Model::simulate(float deltaTime, bool fullUpdate) {
 
 //virtual
 void Model::updateRig(float deltaTime, glm::mat4 parentTransform) {
+    _needsUpdateClusterMatrices = true;
      _rig->updateAnimations(deltaTime, parentTransform);
 }
 void Model::simulateInternal(float deltaTime) {
@@ -1293,11 +1306,15 @@ void Model::simulateInternal(float deltaTime) {
     updateRig(deltaTime, parentTransform);
 }
 void Model::updateClusterMatrices() {
+    if (!_needsUpdateClusterMatrices) {
+        return;
+    }
+    _needsUpdateClusterMatrices = false;
     const FBXGeometry& geometry = _geometry->getFBXGeometry();
     glm::mat4 zeroScale(glm::vec4(0.0f, 0.0f, 0.0f, 0.0f),
-                        glm::vec4(0.0f, 0.0f, 0.0f, 0.0f),
-                        glm::vec4(0.0f, 0.0f, 0.0f, 0.0f),
-                        glm::vec4(0.0f, 0.0f, 0.0f, 1.0f));
+        glm::vec4(0.0f, 0.0f, 0.0f, 0.0f),
+        glm::vec4(0.0f, 0.0f, 0.0f, 0.0f),
+        glm::vec4(0.0f, 0.0f, 0.0f, 1.0f));
     auto cauterizeMatrix = _rig->getJointTransform(geometry.neckJointIndex) * zeroScale;
 
     glm::mat4 modelToWorld = glm::mat4_cast(_rotation);
@@ -1803,13 +1820,15 @@ bool Model::initWhenReady(render::ScenePointer scene) {
         segregateMeshGroups();
 
         render::PendingChanges pendingChanges;
-
         foreach (auto renderItem, _transparentRenderItems) {
             auto item = scene->allocateID();
             auto renderData = MeshPartPayload::Pointer(renderItem);
             auto renderPayload = std::make_shared<MeshPartPayload::Payload>(renderData);
             _renderItems.insert(item, renderPayload);
             pendingChanges.resetItem(item, renderPayload);
+            pendingChanges.updateItem<MeshPartPayload>(item, [&](MeshPartPayload& data) {
+                data.model->_needsUpdateClusterMatrices = true;
+            });
         }
 
         foreach (auto renderItem, _opaqueRenderItems) {
@@ -1818,6 +1837,9 @@ bool Model::initWhenReady(render::ScenePointer scene) {
             auto renderPayload = std::make_shared<MeshPartPayload::Payload>(renderData);
             _renderItems.insert(item, renderPayload);
             pendingChanges.resetItem(item, renderPayload);
+            pendingChanges.updateItem<MeshPartPayload>(item, [&](MeshPartPayload& data) {
+                data.model->_needsUpdateClusterMatrices = true;
+            });
         }
         scene->enqueuePendingChanges(pendingChanges);
 
diff --git a/libraries/render-utils/src/Model.h b/libraries/render-utils/src/Model.h
index 348e5cf549..93b98da8b5 100644
--- a/libraries/render-utils/src/Model.h
+++ b/libraries/render-utils/src/Model.h
@@ -497,6 +497,7 @@ private:
     QMap<render::ItemID, render::PayloadPointer> _renderItems;
     bool _readyWhenAdded = false;
     bool _needsReload = true;
+    bool _needsUpdateClusterMatrices = true;
 
 protected:
     RigPointer _rig;
diff --git a/libraries/script-engine/src/ScriptCache.cpp b/libraries/script-engine/src/ScriptCache.cpp
index 9e04cd4ec3..e2c07c05d0 100644
--- a/libraries/script-engine/src/ScriptCache.cpp
+++ b/libraries/script-engine/src/ScriptCache.cpp
@@ -15,6 +15,7 @@
 #include <QNetworkConfiguration>
 #include <QNetworkReply>
 #include <QObject>
+#include <QThread>
 
 #include <assert.h>
 #include <SharedUtil.h>
@@ -26,7 +27,8 @@ ScriptCache::ScriptCache(QObject* parent) {
     // nothing to do here...
 }
 
-QString ScriptCache::getScript(const QUrl& url, ScriptUser* scriptUser, bool& isPending, bool reload) {
+QString ScriptCache::getScript(const QUrl& unnormalizedURL, ScriptUser* scriptUser, bool& isPending, bool reload) {
+    QUrl url = ResourceManager::normalizeURL(unnormalizedURL);
     QString scriptContents;
     if (_scriptCache.contains(url) && !reload) {
         qCDebug(scriptengine) << "Found script in cache:" << url.toString();
@@ -41,7 +43,7 @@ QString ScriptCache::getScript(const QUrl& url, ScriptUser* scriptUser, bool& is
         if (alreadyWaiting) {
             qCDebug(scriptengine) << "Already downloading script at:" << url.toString();
         } else {
-            auto request = ResourceManager::createResourceRequest(this, url);
+            auto request = ResourceManager::createResourceRequest(nullptr, url);
             request->setCacheEnabled(!reload);
             connect(request, &ResourceRequest::finished, this, &ScriptCache::scriptDownloaded);
             request->send();
@@ -50,7 +52,8 @@ QString ScriptCache::getScript(const QUrl& url, ScriptUser* scriptUser, bool& is
     return scriptContents;
 }
 
-void ScriptCache::deleteScript(const QUrl& url) {
+void ScriptCache::deleteScript(const QUrl& unnormalizedURL) {
+    QUrl url = ResourceManager::normalizeURL(unnormalizedURL);
     if (_scriptCache.contains(url)) {
         qCDebug(scriptengine) << "Delete script from cache:" << url.toString();
         _scriptCache.remove(url);
@@ -79,4 +82,63 @@ void ScriptCache::scriptDownloaded() {
     req->deleteLater();
 }
 
+void ScriptCache::getScriptContents(const QString& scriptOrURL, contentAvailableCallback contentAvailable, bool forceDownload) {
+    #ifdef THREAD_DEBUGGING
+    qCDebug(scriptengine) << "ScriptCache::getScriptContents() on thread [" << QThread::currentThread() << "] expected thread [" << thread() << "]";
+    #endif
+    QUrl unnormalizedURL(scriptOrURL);
+    QUrl url = ResourceManager::normalizeURL(unnormalizedURL);
+
+    // attempt to determine if this is a URL to a script, or if this is actually a script itself (which is valid in the entityScript use case)
+    if (url.scheme().isEmpty() && scriptOrURL.simplified().replace(" ", "").contains("(function(){")) {
+        contentAvailable(scriptOrURL, scriptOrURL, false, true);
+        return;
+    }
+
+    if (_scriptCache.contains(url) && !forceDownload) {
+        qCDebug(scriptengine) << "Found script in cache:" << url.toString();
+        #if 1 // def THREAD_DEBUGGING
+        qCDebug(scriptengine) << "ScriptCache::getScriptContents() about to call contentAvailable() on thread [" << QThread::currentThread() << "] expected thread [" << thread() << "]";
+        #endif
+        contentAvailable(url.toString(), _scriptCache[url], true, true);
+    } else {
+        bool alreadyWaiting = _contentCallbacks.contains(url);
+        _contentCallbacks.insert(url, contentAvailable);
+
+        if (alreadyWaiting) {
+            qCDebug(scriptengine) << "Already downloading script at:" << url.toString();
+        } else {
+            #ifdef THREAD_DEBUGGING
+            qCDebug(scriptengine) << "about to call: ResourceManager::createResourceRequest(this, url); on thread [" << QThread::currentThread() << "] expected thread [" << thread() << "]";
+            #endif
+            auto request = ResourceManager::createResourceRequest(nullptr, url);
+            request->setCacheEnabled(!forceDownload);
+            connect(request, &ResourceRequest::finished, this, &ScriptCache::scriptContentAvailable);
+            request->send();
+        }
+    }
+}
+
+void ScriptCache::scriptContentAvailable() {
+    #ifdef THREAD_DEBUGGING
+    qCDebug(scriptengine) << "ScriptCache::scriptContentAvailable() on thread [" << QThread::currentThread() << "] expected thread [" << thread() << "]";
+    #endif
+    ResourceRequest* req = qobject_cast<ResourceRequest*>(sender());
+    QUrl url = req->getUrl();
+    QList<contentAvailableCallback> allCallbacks = _contentCallbacks.values(url);
+    _contentCallbacks.remove(url);
+
+    bool success = req->getResult() == ResourceRequest::Success;
+
+    if (success) {
+        _scriptCache[url] = req->getData();
+        qCDebug(scriptengine) << "Done downloading script at:" << url.toString();
+    } else {
+        qCWarning(scriptengine) << "Error loading script from URL " << url;
+    }
+    foreach(contentAvailableCallback thisCallback, allCallbacks) {
+        thisCallback(url.toString(), _scriptCache[url], true, success);
+    }
+    req->deleteLater();
+}
 
diff --git a/libraries/script-engine/src/ScriptCache.h b/libraries/script-engine/src/ScriptCache.h
index 25a36c04d8..7de14a09f7 100644
--- a/libraries/script-engine/src/ScriptCache.h
+++ b/libraries/script-engine/src/ScriptCache.h
@@ -20,23 +20,33 @@ public:
     virtual void errorInLoadingScript(const QUrl& url) = 0;
 };
 
+using contentAvailableCallback = std::function<void(const QString& scriptOrURL, const QString& contents, bool isURL, bool contentAvailable)>;
+
 /// Interface for loading scripts
 class ScriptCache : public QObject, public Dependency {
     Q_OBJECT
     SINGLETON_DEPENDENCY
 
 public:
-    QString getScript(const QUrl& url, ScriptUser* scriptUser, bool& isPending, bool redownload = false);
-    void deleteScript(const QUrl& url);
+    void getScriptContents(const QString& scriptOrURL, contentAvailableCallback contentAvailable, bool forceDownload = false);
+
+
+    QString getScript(const QUrl& unnormalizedURL, ScriptUser* scriptUser, bool& isPending, bool redownload = false);
+    void deleteScript(const QUrl& unnormalizedURL);
+
+    // FIXME - how do we remove a script from the bad script list in the case of a redownload?
     void addScriptToBadScriptList(const QUrl& url) { _badScripts.insert(url); }
     bool isInBadScriptList(const QUrl& url) { return _badScripts.contains(url); }
     
 private slots:
-    void scriptDownloaded();
-    
+    void scriptDownloaded(); // old version
+    void scriptContentAvailable(); // new version
+
 private:
     ScriptCache(QObject* parent = NULL);
     
+    QMultiMap<QUrl, contentAvailableCallback> _contentCallbacks;
+    
     QHash<QUrl, QString> _scriptCache;
     QMultiMap<QUrl, ScriptUser*> _scriptUsers;
     QSet<QUrl> _badScripts;
diff --git a/libraries/script-engine/src/ScriptEngine.cpp b/libraries/script-engine/src/ScriptEngine.cpp
index a9ada42543..a7136edd7b 100644
--- a/libraries/script-engine/src/ScriptEngine.cpp
+++ b/libraries/script-engine/src/ScriptEngine.cpp
@@ -16,6 +16,7 @@
 #include <QtNetwork/QNetworkRequest>
 #include <QtNetwork/QNetworkReply>
 #include <QScriptEngine>
+#include <QScriptValue>
 
 #include <AudioConstants.h>
 #include <AudioEffectOptions.h>
@@ -44,6 +45,8 @@
 
 #include "MIDIEvent.h"
 
+Q_DECLARE_METATYPE(QScriptEngine::FunctionSignature)
+static int functionSignatureMetaID = qRegisterMetaType<QScriptEngine::FunctionSignature>();
 
 static QScriptValue debugPrint(QScriptContext* context, QScriptEngine* engine){
     QString message = "";
@@ -87,17 +90,9 @@ ScriptEngine::ScriptEngine(const QString& scriptContents, const QString& fileNam
     _isFinished(false),
     _isRunning(false),
     _isInitialized(false),
-    _isAvatar(false),
-    _avatarIdentityTimer(NULL),
-    _avatarBillboardTimer(NULL),
     _timerFunctionMap(),
-    _isListeningToAudioStream(false),
-    _avatarSound(NULL),
-    _numAvatarSoundSentBytes(0),
     _wantSignals(wantSignals),
     _controllerScriptingInterface(controllerScriptingInterface),
-    _avatarData(NULL),
-    _scriptName(),
     _fileNameString(fileNameString),
     _quatLibrary(),
     _vec3Library(),
@@ -122,6 +117,29 @@ ScriptEngine::~ScriptEngine() {
     }
 }
 
+void ScriptEngine::runInThread() {
+    QThread* workerThread = new QThread(); // thread is not owned, so we need to manage the delete
+    QString scriptEngineName = QString("Script Thread:") + getFilename();
+    workerThread->setObjectName(scriptEngineName);
+
+    // when the worker thread is started, call our engine's run..
+    connect(workerThread, &QThread::started, this, &ScriptEngine::run);
+
+    // tell the thread to stop when the script engine is done
+    connect(this, &ScriptEngine::doneRunning, workerThread, &QThread::quit);
+
+    // when the thread is finished, add thread to the deleteLater queue
+    connect(workerThread, &QThread::finished, workerThread, &QThread::deleteLater);
+
+    // when the thread is finished, add scriptEngine to the deleteLater queue
+    connect(workerThread, &QThread::finished, this, &ScriptEngine::deleteLater);
+
+    moveToThread(workerThread);
+
+    // Starts an event loop, and emits workerThread->started()
+    workerThread->start();
+}
+
 QSet<ScriptEngine*> ScriptEngine::_allKnownScriptEngines;
 QMutex ScriptEngine::_allScriptsMutex;
 bool ScriptEngine::_stoppingAllScripts = false;
@@ -180,8 +198,6 @@ void ScriptEngine::stopAllScripts(QObject* application) {
 
 
 void ScriptEngine::waitTillDoneRunning() {
-    QString scriptName = getFilename();
-
     // If the script never started running or finished running before we got here, we don't need to wait for it
     if (_isRunning) {
 
@@ -209,58 +225,7 @@ QString ScriptEngine::getFilename() const {
 }
 
 
-void ScriptEngine::setIsAvatar(bool isAvatar) {
-    _isAvatar = isAvatar;
-
-    if (_isAvatar && !_avatarIdentityTimer) {
-        // set up the avatar timers
-        _avatarIdentityTimer = new QTimer(this);
-        _avatarBillboardTimer = new QTimer(this);
-
-        // connect our slot
-        connect(_avatarIdentityTimer, &QTimer::timeout, this, &ScriptEngine::sendAvatarIdentityPacket);
-        connect(_avatarBillboardTimer, &QTimer::timeout, this, &ScriptEngine::sendAvatarBillboardPacket);
-
-        // start the timers
-        _avatarIdentityTimer->start(AVATAR_IDENTITY_PACKET_SEND_INTERVAL_MSECS);
-        _avatarBillboardTimer->start(AVATAR_BILLBOARD_PACKET_SEND_INTERVAL_MSECS);
-    }
-
-    if (!_isAvatar) {
-        delete _avatarIdentityTimer;
-        _avatarIdentityTimer = NULL;
-        delete _avatarBillboardTimer;
-        _avatarBillboardTimer = NULL;
-    }
-}
-
-void ScriptEngine::setAvatarData(AvatarData* avatarData, const QString& objectName) {
-    _avatarData = avatarData;
-
-    // remove the old Avatar property, if it exists
-    globalObject().setProperty(objectName, QScriptValue());
-
-    // give the script engine the new Avatar script property
-    registerGlobalObject(objectName, _avatarData);
-}
-
-void ScriptEngine::setAvatarHashMap(AvatarHashMap* avatarHashMap, const QString& objectName) {
-    // remove the old Avatar property, if it exists
-    globalObject().setProperty(objectName, QScriptValue());
-
-    // give the script engine the new avatar hash map
-    registerGlobalObject(objectName, avatarHashMap);
-}
-
-bool ScriptEngine::setScriptContents(const QString& scriptContents, const QString& fileNameString) {
-    if (_isRunning) {
-        return false;
-    }
-    _scriptContents = scriptContents;
-    _fileNameString = fileNameString;
-    return true;
-}
-
+// FIXME - switch this to the new model of ScriptCache callbacks
 void ScriptEngine::loadURL(const QUrl& scriptURL, bool reload) {
     if (_isRunning) {
         return;
@@ -271,38 +236,12 @@ void ScriptEngine::loadURL(const QUrl& scriptURL, bool reload) {
 
     QUrl url(scriptURL);
 
-    // if the scheme length is one or lower, maybe they typed in a file, let's try
-    const int WINDOWS_DRIVE_LETTER_SIZE = 1;
-    if (url.scheme().size() <= WINDOWS_DRIVE_LETTER_SIZE) {
-        url = QUrl::fromLocalFile(_fileNameString);
-    }
-
-    // ok, let's see if it's valid... and if so, load it
-    if (url.isValid()) {
-        if (url.scheme() == "file") {
-            _fileNameString = url.toLocalFile();
-            QFile scriptFile(_fileNameString);
-            if (scriptFile.open(QFile::ReadOnly | QFile::Text)) {
-                qCDebug(scriptengine) << "ScriptEngine loading file:" << _fileNameString;
-                QTextStream in(&scriptFile);
-                _scriptContents = in.readAll();
-                if (_wantSignals) {
-                    emit scriptLoaded(_fileNameString);
-                }
-            } else {
-                qCDebug(scriptengine) << "ERROR Loading file:" << _fileNameString << "line:" << __LINE__;
-                if (_wantSignals) {
-                    emit errorLoadingScript(_fileNameString);
-                }
-            }
-        } else {
-            bool isPending;
-            auto scriptCache = DependencyManager::get<ScriptCache>();
-            scriptCache->getScript(url, this, isPending, reload);
-        }
-    }
+    bool isPending;
+    auto scriptCache = DependencyManager::get<ScriptCache>();
+    scriptCache->getScript(url, this, isPending, reload);
 }
 
+// FIXME - switch this to the new model of ScriptCache callbacks
 void ScriptEngine::scriptContentsAvailable(const QUrl& url, const QString& scriptContents) {
     _scriptContents = scriptContents;
     if (_wantSignals) {
@@ -310,6 +249,7 @@ void ScriptEngine::scriptContentsAvailable(const QUrl& url, const QString& scrip
     }
 }
 
+// FIXME - switch this to the new model of ScriptCache callbacks
 void ScriptEngine::errorInLoadingScript(const QUrl& url) {
     qCDebug(scriptengine) << "ERROR Loading file:" << url.toString() << "line:" << __LINE__;
     if (_wantSignals) {
@@ -383,57 +323,117 @@ void ScriptEngine::init() {
     globalObject().setProperty("TREE_SCALE", newVariant(QVariant(TREE_SCALE)));
 }
 
-QScriptValue ScriptEngine::registerGlobalObject(const QString& name, QObject* object) {
+void ScriptEngine::registerGlobalObject(const QString& name, QObject* object) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::registerGlobalObject() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "]  name:" << name;
+        #endif
+        QMetaObject::invokeMethod(this, "registerGlobalObject",
+            Q_ARG(const QString&, name),
+            Q_ARG(QObject*, object));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::registerGlobalObject() called on thread [" << QThread::currentThread() << "] name:" << name;
+    #endif
+
     if (object) {
         QScriptValue value = newQObject(object);
         globalObject().setProperty(name, value);
-        return value;
     }
-    return QScriptValue::NullValue;
 }
 
-void ScriptEngine::registerFunction(const QString& name, QScriptEngine::FunctionSignature fun, int numArguments) {
-    registerFunction(globalObject(), name, fun, numArguments);
+void ScriptEngine::registerFunction(const QString& name, QScriptEngine::FunctionSignature functionSignature, int numArguments) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::registerFunction() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "] name:" << name;
+        #endif
+        QMetaObject::invokeMethod(this, "registerFunction",
+            Q_ARG(const QString&, name),
+            Q_ARG(QScriptEngine::FunctionSignature, functionSignature),
+            Q_ARG(int, numArguments));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::registerFunction() called on thread [" << QThread::currentThread() << "] name:" << name;
+    #endif
+
+    QScriptValue scriptFun = newFunction(functionSignature, numArguments);
+    globalObject().setProperty(name, scriptFun);
 }
 
-void ScriptEngine::registerFunction(QScriptValue parent, const QString& name, QScriptEngine::FunctionSignature fun, int numArguments) {
-    QScriptValue scriptFun = newFunction(fun, numArguments);
-    parent.setProperty(name, scriptFun);
+void ScriptEngine::registerFunction(const QString& parent, const QString& name, QScriptEngine::FunctionSignature functionSignature, int numArguments) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::registerFunction() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "] parent:" << parent << "name:" << name;
+        #endif
+        QMetaObject::invokeMethod(this, "registerFunction",
+            Q_ARG(const QString&, name),
+            Q_ARG(QScriptEngine::FunctionSignature, functionSignature),
+            Q_ARG(int, numArguments));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::registerFunction() called on thread [" << QThread::currentThread() << "] parent:" << parent << "name:" << name;
+    #endif
+
+    QScriptValue object = globalObject().property(parent);
+    if (object.isValid()) {
+        QScriptValue scriptFun = newFunction(functionSignature, numArguments);
+        object.setProperty(name, scriptFun);
+    }
 }
 
 void ScriptEngine::registerGetterSetter(const QString& name, QScriptEngine::FunctionSignature getter,
-                                        QScriptEngine::FunctionSignature setter, QScriptValue object) {
+                            QScriptEngine::FunctionSignature setter, const QString& parent) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::registerGetterSetter() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "] "
+                    " name:" << name << "parent:" << parent;
+        #endif
+        QMetaObject::invokeMethod(this, "registerGetterSetter",
+            Q_ARG(const QString&, name),
+            Q_ARG(QScriptEngine::FunctionSignature, getter),
+            Q_ARG(QScriptEngine::FunctionSignature, setter),
+            Q_ARG(const QString&, parent));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::registerGetterSetter() called on thread [" << QThread::currentThread() << "] name:" << name << "parent:" << parent;
+    #endif
+
     QScriptValue setterFunction = newFunction(setter, 1);
     QScriptValue getterFunction = newFunction(getter);
 
-    if (!object.isNull()) {
-        object.setProperty(name, setterFunction, QScriptValue::PropertySetter);
-        object.setProperty(name, getterFunction, QScriptValue::PropertyGetter);
+    if (!parent.isNull()) {
+        QScriptValue object = globalObject().property(parent);
+        if (object.isValid()) {
+            object.setProperty(name, setterFunction, QScriptValue::PropertySetter);
+            object.setProperty(name, getterFunction, QScriptValue::PropertyGetter);
+        }
     } else {
         globalObject().setProperty(name, setterFunction, QScriptValue::PropertySetter);
         globalObject().setProperty(name, getterFunction, QScriptValue::PropertyGetter);
     }
 }
 
-// Look up the handler associated with eventName and entityID. If found, evalute the argGenerator thunk and call the handler with those args
-void ScriptEngine::generalHandler(const EntityItemID& entityID, const QString& eventName, std::function<QScriptValueList()> argGenerator) {
-    if (!_registeredHandlers.contains(entityID)) {
-        return;
-    }
-    const RegisteredEventHandlers& handlersOnEntity = _registeredHandlers[entityID];
-    if (!handlersOnEntity.contains(eventName)) {
-        return;
-    }
-    QScriptValueList handlersForEvent = handlersOnEntity[eventName];
-    if (!handlersForEvent.isEmpty()) {
-        QScriptValueList args = argGenerator();
-        for (int i = 0; i < handlersForEvent.count(); ++i) {
-            handlersForEvent[i].call(QScriptValue(), args);
-        }
-    }
-}
 // Unregister the handlers for this eventName and entityID.
 void ScriptEngine::removeEventHandler(const EntityItemID& entityID, const QString& eventName, QScriptValue handler) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::removeEventHandler() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "] "
+                    "entityID:" << entityID << " eventName:" << eventName;
+        #endif
+        QMetaObject::invokeMethod(this, "removeEventHandler",
+            Q_ARG(const EntityItemID&, entityID),
+            Q_ARG(const QString&, eventName),
+            Q_ARG(QScriptValue, handler));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::removeEventHandler() called on thread [" << QThread::currentThread() << "] entityID:" << entityID << " eventName : " << eventName;
+    #endif
+
     if (!_registeredHandlers.contains(entityID)) {
         return;
     }
@@ -449,6 +449,22 @@ void ScriptEngine::removeEventHandler(const EntityItemID& entityID, const QStrin
 }
 // Register the handler.
 void ScriptEngine::addEventHandler(const EntityItemID& entityID, const QString& eventName, QScriptValue handler) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::addEventHandler() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "] "
+            "entityID:" << entityID << " eventName:" << eventName;
+        #endif
+
+        QMetaObject::invokeMethod(this, "addEventHandler",
+            Q_ARG(const EntityItemID&, entityID),
+            Q_ARG(const QString&, eventName),
+            Q_ARG(QScriptValue, handler));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::addEventHandler() called on thread [" << QThread::currentThread() << "] entityID:" << entityID << " eventName : " << eventName;
+    #endif
+
     if (_registeredHandlers.count() == 0) { // First time any per-entity handler has been added in this script...
         // Connect up ALL the handlers to the global entities object's signals.
         // (We could go signal by signal, or even handler by handler, but I don't think the efficiency is worth the complexity.)
@@ -503,34 +519,25 @@ void ScriptEngine::addEventHandler(const EntityItemID& entityID, const QString&
 }
 
 
-void ScriptEngine::evaluate() {
-    if (_stoppingAllScripts) {
-        return; // bail early
-    }
-
-    if (!_isInitialized) {
-        init();
-    }
-
-    QScriptValue result = evaluate(_scriptContents);
-
-    // TODO: why do we check this twice? It seems like the call to clearExceptions() in the lower level evaluate call
-    // will cause this code to never actually run...
-    if (hasUncaughtException()) {
-        int line = uncaughtExceptionLineNumber();
-        qCDebug(scriptengine) << "Uncaught exception at (" << _fileNameString << ") line" << line << ":" << result.toString();
-        if (_wantSignals) {
-            emit errorMessage("Uncaught exception at (" + _fileNameString + ") line" + QString::number(line) + ":" + result.toString());
-        }
-        clearExceptions();
-    }
-}
-
 QScriptValue ScriptEngine::evaluate(const QString& program, const QString& fileName, int lineNumber) {
     if (_stoppingAllScripts) {
         return QScriptValue(); // bail early
     }
 
+    if (QThread::currentThread() != thread()) {
+        QScriptValue result;
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::evaluate() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "] "
+            "program:" << program << " fileName:" << fileName << "lineNumber:" << lineNumber;
+        #endif
+        QMetaObject::invokeMethod(this, "evaluate", Qt::BlockingQueuedConnection,
+            Q_RETURN_ARG(QScriptValue, result),
+            Q_ARG(const QString&, program),
+            Q_ARG(const QString&, fileName),
+            Q_ARG(int, lineNumber));
+        return result;
+    }
+
     _evaluatesPending++;
     QScriptValue result = QScriptEngine::evaluate(program, fileName, lineNumber);
     if (hasUncaughtException()) {
@@ -545,18 +552,6 @@ QScriptValue ScriptEngine::evaluate(const QString& program, const QString& fileN
     return result;
 }
 
-void ScriptEngine::sendAvatarIdentityPacket() {
-    if (_isAvatar && _avatarData) {
-        _avatarData->sendIdentityPacket();
-    }
-}
-
-void ScriptEngine::sendAvatarBillboardPacket() {
-    if (_isAvatar && _avatarData) {
-        _avatarData->sendBillboardPacket();
-    }
-}
-
 void ScriptEngine::run() {
     // TODO: can we add a short circuit for _stoppingAllScripts here? What does it mean to not start running if
     // we're in the process of stopping?
@@ -608,107 +603,6 @@ void ScriptEngine::run() {
             }
         }
 
-        if (!_isFinished && _isAvatar && _avatarData) {
-
-            const int SCRIPT_AUDIO_BUFFER_SAMPLES = floor(((SCRIPT_DATA_CALLBACK_USECS * AudioConstants::SAMPLE_RATE)
-                                                           / (1000 * 1000)) + 0.5);
-            const int SCRIPT_AUDIO_BUFFER_BYTES = SCRIPT_AUDIO_BUFFER_SAMPLES * sizeof(int16_t);
-
-            QByteArray avatarByteArray = _avatarData->toByteArray(true, randFloat() < AVATAR_SEND_FULL_UPDATE_RATIO);
-            _avatarData->doneEncoding(true);
-            auto avatarPacket = NLPacket::create(PacketType::AvatarData, avatarByteArray.size());
-
-            avatarPacket->write(avatarByteArray);
-
-            nodeList->broadcastToNodes(std::move(avatarPacket), NodeSet() << NodeType::AvatarMixer);
-
-            if (_isListeningToAudioStream || _avatarSound) {
-                // if we have an avatar audio stream then send it out to our audio-mixer
-                bool silentFrame = true;
-
-                int16_t numAvailableSamples = SCRIPT_AUDIO_BUFFER_SAMPLES;
-                const int16_t* nextSoundOutput = NULL;
-
-                if (_avatarSound) {
-
-                    const QByteArray& soundByteArray = _avatarSound->getByteArray();
-                    nextSoundOutput = reinterpret_cast<const int16_t*>(soundByteArray.data()
-                                                                       + _numAvatarSoundSentBytes);
-
-                    int numAvailableBytes = (soundByteArray.size() - _numAvatarSoundSentBytes) > SCRIPT_AUDIO_BUFFER_BYTES
-                        ? SCRIPT_AUDIO_BUFFER_BYTES
-                        : soundByteArray.size() - _numAvatarSoundSentBytes;
-                    numAvailableSamples = numAvailableBytes / sizeof(int16_t);
-
-
-                    // check if the all of the _numAvatarAudioBufferSamples to be sent are silence
-                    for (int i = 0; i < numAvailableSamples; ++i) {
-                        if (nextSoundOutput[i] != 0) {
-                            silentFrame = false;
-                            break;
-                        }
-                    }
-
-                    _numAvatarSoundSentBytes += numAvailableBytes;
-                    if (_numAvatarSoundSentBytes == soundByteArray.size()) {
-                        // we're done with this sound object - so set our pointer back to NULL
-                        // and our sent bytes back to zero
-                        _avatarSound = NULL;
-                        _numAvatarSoundSentBytes = 0;
-                    }
-                }
-
-                auto audioPacket = NLPacket::create(silentFrame
-                                                    ? PacketType::SilentAudioFrame
-                                                    : PacketType::MicrophoneAudioNoEcho);
-
-                // seek past the sequence number, will be packed when destination node is known
-                audioPacket->seek(sizeof(quint16));
-
-                if (silentFrame) {
-                    if (!_isListeningToAudioStream) {
-                        // if we have a silent frame and we're not listening then just send nothing and break out of here
-                        break;
-                    }
-
-                    // write the number of silent samples so the audio-mixer can uphold timing
-                    audioPacket->writePrimitive(SCRIPT_AUDIO_BUFFER_SAMPLES);
-
-                    // use the orientation and position of this avatar for the source of this audio
-                    audioPacket->writePrimitive(_avatarData->getPosition());
-                    glm::quat headOrientation = _avatarData->getHeadOrientation();
-                    audioPacket->writePrimitive(headOrientation);
-
-                } else if (nextSoundOutput) {
-                    // assume scripted avatar audio is mono and set channel flag to zero
-                    audioPacket->writePrimitive((quint8) 0);
-
-                    // use the orientation and position of this avatar for the source of this audio
-                    audioPacket->writePrimitive(_avatarData->getPosition());
-                    glm::quat headOrientation = _avatarData->getHeadOrientation();
-                    audioPacket->writePrimitive(headOrientation);
-
-                    // write the raw audio data
-                    audioPacket->write(reinterpret_cast<const char*>(nextSoundOutput), numAvailableSamples * sizeof(int16_t));
-                }
-
-                // write audio packet to AudioMixer nodes
-                auto nodeList = DependencyManager::get<NodeList>();
-                nodeList->eachNode([this, &nodeList, &audioPacket](const SharedNodePointer& node){
-                    // only send to nodes of type AudioMixer
-                    if (node->getType() == NodeType::AudioMixer) {
-                        // pack sequence number
-                        quint16 sequence = _outgoingScriptAudioSequenceNumbers[node->getUUID()]++;
-                        audioPacket->seek(0);
-                        audioPacket->writePrimitive(sequence);
-
-                        // send audio packet
-                        nodeList->sendUnreliablePacket(*audioPacket, *node);
-                    }
-                });
-            }
-        }
-
         qint64 now = usecTimestampNow();
         float deltaTime = (float) (now - lastUpdate) / (float) USECS_PER_SECOND;
 
@@ -735,9 +629,6 @@ void ScriptEngine::run() {
         emit scriptEnding();
     }
 
-    // kill the avatar identity timer
-    delete _avatarIdentityTimer;
-
     if (entityScriptingInterface->getEntityPacketSender()->serversExist()) {
         // release the queue of edit entity messages.
         entityScriptingInterface->getEntityPacketSender()->releaseQueuedMessages();
@@ -967,6 +858,256 @@ void ScriptEngine::load(const QString& loadFile) {
     }
 }
 
-void ScriptEngine::nodeKilled(SharedNodePointer node) {
-    _outgoingScriptAudioSequenceNumbers.remove(node->getUUID());
+// Look up the handler associated with eventName and entityID. If found, evalute the argGenerator thunk and call the handler with those args
+void ScriptEngine::generalHandler(const EntityItemID& entityID, const QString& eventName, std::function<QScriptValueList()> argGenerator) {
+    if (QThread::currentThread() != thread()) {
+        qDebug() << "*** ERROR *** ScriptEngine::generalHandler() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "]";
+        assert(false);
+        return;
+    }
+
+    if (!_registeredHandlers.contains(entityID)) {
+        return;
+    }
+    const RegisteredEventHandlers& handlersOnEntity = _registeredHandlers[entityID];
+    if (!handlersOnEntity.contains(eventName)) {
+        return;
+    }
+    QScriptValueList handlersForEvent = handlersOnEntity[eventName];
+    if (!handlersForEvent.isEmpty()) {
+        QScriptValueList args = argGenerator();
+        for (int i = 0; i < handlersForEvent.count(); ++i) {
+            handlersForEvent[i].call(QScriptValue(), args);
+        }
+    }
+}
+
+// since all of these operations can be asynch we will always do the actual work in the response handler
+// for the download
+void ScriptEngine::loadEntityScript(const EntityItemID& entityID, const QString& entityScript, bool forceRedownload) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::loadEntityScript() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "]  "
+            "entityID:" << entityID << "entityScript:" << entityScript <<"forceRedownload:" << forceRedownload;
+        #endif
+
+        QMetaObject::invokeMethod(this, "loadEntityScript",
+            Q_ARG(const EntityItemID&, entityID),
+            Q_ARG(const QString&, entityScript),
+            Q_ARG(bool, forceRedownload));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::loadEntityScript() called on correct thread [" << thread() << "]  "
+        "entityID:" << entityID << "entityScript:" << entityScript << "forceRedownload:" << forceRedownload;
+    #endif
+
+    // If we've been called our known entityScripts should not know about us..
+    assert(!_entityScripts.contains(entityID));
+
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::loadEntityScript() calling scriptCache->getScriptContents() on thread [" << QThread::currentThread() << "] expected thread [" << thread() << "]";
+    #endif
+    DependencyManager::get<ScriptCache>()->getScriptContents(entityScript, [=](const QString& scriptOrURL, const QString& contents, bool isURL, bool success) {
+            #ifdef THREAD_DEBUGGING
+            qDebug() << "ScriptEngine::entityScriptContentAvailable() IN LAMBDA contentAvailable on thread [" << QThread::currentThread() << "] expected thread [" << thread() << "]";
+            #endif
+
+            this->entityScriptContentAvailable(entityID, scriptOrURL, contents, isURL, success);
+        }, forceRedownload);
+}
+
+// since all of these operations can be asynch we will always do the actual work in the response handler
+// for the download
+void ScriptEngine::entityScriptContentAvailable(const EntityItemID& entityID, const QString& scriptOrURL, const QString& contents, bool isURL, bool success) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::entityScriptContentAvailable() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "]  "
+            "entityID:" << entityID << "scriptOrURL:" << scriptOrURL << "contents:" << contents << "isURL:" << isURL << "success:" << success;
+        #endif
+
+        QMetaObject::invokeMethod(this, "entityScriptContentAvailable",
+            Q_ARG(const EntityItemID&, entityID),
+            Q_ARG(const QString&, scriptOrURL),
+            Q_ARG(const QString&, contents),
+            Q_ARG(bool, isURL),
+            Q_ARG(bool, success));
+        return;
+    }
+
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::entityScriptContentAvailable() thread [" << QThread::currentThread() << "] expected thread [" << thread() << "]";
+    #endif
+
+    auto scriptCache = DependencyManager::get<ScriptCache>();
+
+    // first check the syntax of the script contents
+    QScriptSyntaxCheckResult syntaxCheck = QScriptEngine::checkSyntax(contents);
+    if (syntaxCheck.state() != QScriptSyntaxCheckResult::Valid) {
+        qCDebug(scriptengine) << "ScriptEngine::loadEntityScript() entity:" << entityID;
+        qCDebug(scriptengine) << "   " << syntaxCheck.errorMessage() << ":"
+                << syntaxCheck.errorLineNumber() << syntaxCheck.errorColumnNumber();
+        qCDebug(scriptengine) << "    SCRIPT:" << scriptOrURL;
+        scriptCache->addScriptToBadScriptList(scriptOrURL);
+        return; // done processing script
+    }
+
+    if (isURL) {
+        setParentURL(scriptOrURL);
+    }
+
+    QScriptEngine sandbox;
+    QScriptValue testConstructor = sandbox.evaluate(contents);
+
+    if (!testConstructor.isFunction()) {
+        qCDebug(scriptengine) << "ScriptEngine::loadEntityScript() entity:" << entityID;
+        qCDebug(scriptengine) << "    NOT CONSTRUCTOR";
+        qCDebug(scriptengine) << "    SCRIPT:" << scriptOrURL;
+        scriptCache->addScriptToBadScriptList(scriptOrURL);
+        return; // done processing script
+    }
+
+    QScriptValue entityScriptConstructor = evaluate(contents);
+
+    QScriptValue entityScriptObject = entityScriptConstructor.construct();
+    EntityScriptDetails newDetails = { scriptOrURL, entityScriptObject };
+    _entityScripts[entityID] = newDetails;
+    if (isURL) {
+        setParentURL("");
+    }
+
+    // if we got this far, then call the preload method
+    callEntityScriptMethod(entityID, "preload");
+}
+
+void ScriptEngine::unloadEntityScript(const EntityItemID& entityID) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::unloadEntityScript() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "]  "
+            "entityID:" << entityID;
+        #endif
+
+        QMetaObject::invokeMethod(this, "unloadEntityScript",
+            Q_ARG(const EntityItemID&, entityID));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::unloadEntityScript() called on correct thread [" << thread() << "]  "
+        "entityID:" << entityID;
+    #endif
+
+    if (_entityScripts.contains(entityID)) {
+        callEntityScriptMethod(entityID, "unload");
+        _entityScripts.remove(entityID);
+    }
+}
+
+void ScriptEngine::unloadAllEntityScripts() {
+    if (QThread::currentThread() != thread()) {
+#ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::unloadAllEntityScripts() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "]";
+#endif
+
+        QMetaObject::invokeMethod(this, "unloadAllEntityScripts");
+        return;
+    }
+#ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::unloadAllEntityScripts() called on correct thread [" << thread() << "]";
+#endif
+    foreach(const EntityItemID& entityID, _entityScripts.keys()) {
+        callEntityScriptMethod(entityID, "unload");
+    }
+    _entityScripts.clear();
+}
+
+void ScriptEngine::callEntityScriptMethod(const EntityItemID& entityID, const QString& methodName) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::callEntityScriptMethod() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "]  "
+            "entityID:" << entityID << "methodName:" << methodName;
+        #endif
+
+        QMetaObject::invokeMethod(this, "callEntityScriptMethod",
+            Q_ARG(const EntityItemID&, entityID),
+            Q_ARG(const QString&, methodName));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::callEntityScriptMethod() called on correct thread [" << thread() << "]  "
+        "entityID:" << entityID << "methodName:" << methodName;
+    #endif
+
+    if (_entityScripts.contains(entityID)) {
+        EntityScriptDetails details = _entityScripts[entityID];
+        QScriptValue entityScript = details.scriptObject; // previously loaded
+        if (entityScript.property(methodName).isFunction()) {
+            QScriptValueList args;
+            args << entityID.toScriptValue(this);
+            entityScript.property(methodName).call(entityScript, args);
+        }
+
+    }
+}
+
+void ScriptEngine::callEntityScriptMethod(const EntityItemID& entityID, const QString& methodName, const MouseEvent& event) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::callEntityScriptMethod() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "]  "
+            "entityID:" << entityID << "methodName:" << methodName << "event: mouseEvent";
+        #endif
+
+        QMetaObject::invokeMethod(this, "callEntityScriptMethod",
+            Q_ARG(const EntityItemID&, entityID),
+            Q_ARG(const QString&, methodName),
+            Q_ARG(const MouseEvent&, event));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::callEntityScriptMethod() called on correct thread [" << thread() << "]  "
+        "entityID:" << entityID << "methodName:" << methodName << "event: mouseEvent";
+    #endif
+
+    if (_entityScripts.contains(entityID)) {
+        EntityScriptDetails details = _entityScripts[entityID];
+        QScriptValue entityScript = details.scriptObject; // previously loaded
+        if (entityScript.property(methodName).isFunction()) {
+            QScriptValueList args;
+            args << entityID.toScriptValue(this);
+            args << event.toScriptValue(this);
+            entityScript.property(methodName).call(entityScript, args);
+        }
+    }
+}
+
+
+void ScriptEngine::callEntityScriptMethod(const EntityItemID& entityID, const QString& methodName, const EntityItemID& otherID, const Collision& collision) {
+    if (QThread::currentThread() != thread()) {
+        #ifdef THREAD_DEBUGGING
+        qDebug() << "*** WARNING *** ScriptEngine::callEntityScriptMethod() called on wrong thread [" << QThread::currentThread() << "], invoking on correct thread [" << thread() << "]  "
+            "entityID:" << entityID << "methodName:" << methodName << "otherID:" << otherID << "collision: collision";
+        #endif
+
+        QMetaObject::invokeMethod(this, "callEntityScriptMethod",
+            Q_ARG(const EntityItemID&, entityID),
+            Q_ARG(const QString&, methodName),
+            Q_ARG(const EntityItemID&, otherID),
+            Q_ARG(const Collision&, collision));
+        return;
+    }
+    #ifdef THREAD_DEBUGGING
+    qDebug() << "ScriptEngine::callEntityScriptMethod() called on correct thread [" << thread() << "]  "
+        "entityID:" << entityID << "methodName:" << methodName << "otherID:" << otherID << "collision: collision";
+    #endif
+
+    if (_entityScripts.contains(entityID)) {
+        EntityScriptDetails details = _entityScripts[entityID];
+        QScriptValue entityScript = details.scriptObject; // previously loaded
+        if (entityScript.property(methodName).isFunction()) {
+            QScriptValueList args;
+            args << entityID.toScriptValue(this);
+            args << otherID.toScriptValue(this);
+            args << collisionToScriptValue(this, collision);
+            entityScript.property(methodName).call(entityScript, args);
+        }
+    }
 }
diff --git a/libraries/script-engine/src/ScriptEngine.h b/libraries/script-engine/src/ScriptEngine.h
index 4608732571..83e65823a5 100644
--- a/libraries/script-engine/src/ScriptEngine.h
+++ b/libraries/script-engine/src/ScriptEngine.h
@@ -40,6 +40,12 @@ const unsigned int SCRIPT_DATA_CALLBACK_USECS = floor(((1.0f / 60.0f) * 1000 * 1
 
 typedef QHash<QString, QScriptValueList> RegisteredEventHandlers;
 
+class EntityScriptDetails {
+public:
+    QString scriptText;
+    QScriptValue scriptObject;
+};
+
 class ScriptEngine : public QScriptEngine, public ScriptUser {
     Q_OBJECT
 public:
@@ -50,79 +56,86 @@ public:
 
     ~ScriptEngine();
 
-    ArrayBufferClass* getArrayBufferClass() { return _arrayBufferClass; }
+    /// run the script in a dedicated thread. This will have the side effect of evalulating
+    /// the current script contents and calling run(). Callers will likely want to register the script with external
+    /// services before calling this.
+    void runInThread();
+
+    /// run the script in the callers thread, exit when stop() is called.
+    void run();
     
-    /// sets the script contents, will return false if failed, will fail if script is already running
-    bool setScriptContents(const QString& scriptContents, const QString& fileNameString = QString(""));
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    // NOTE - these are NOT intended to be public interfaces available to scripts, the are only Q_INVOKABLE so we can
+    //        properly ensure they are only called on the correct thread
 
-    const QString& getScriptName() const { return _scriptName; }
+    /// registers a global object by name
+    Q_INVOKABLE void registerGlobalObject(const QString& name, QObject* object);
 
-    QScriptValue registerGlobalObject(const QString& name, QObject* object); /// registers a global object by name
-    void registerGetterSetter(const QString& name, QScriptEngine::FunctionSignature getter,
-                              QScriptEngine::FunctionSignature setter, QScriptValue object = QScriptValue::NullValue);
-    void registerFunction(const QString& name, QScriptEngine::FunctionSignature fun, int numArguments = -1);
-    void registerFunction(QScriptValue parent, const QString& name, QScriptEngine::FunctionSignature fun,
+    /// registers a global getter/setter
+    Q_INVOKABLE void registerGetterSetter(const QString& name, QScriptEngine::FunctionSignature getter,
+                            QScriptEngine::FunctionSignature setter, const QString& parent = QString(""));
+    
+    /// register a global function
+    Q_INVOKABLE void registerFunction(const QString& name, QScriptEngine::FunctionSignature fun, int numArguments = -1);
+
+    /// register a function as a method on a previously registered global object
+    Q_INVOKABLE void registerFunction(const QString& parent, const QString& name, QScriptEngine::FunctionSignature fun,
                           int numArguments = -1);
 
-    Q_INVOKABLE void setIsAvatar(bool isAvatar);
-    bool isAvatar() const { return _isAvatar; }
+    /// evaluate some code in the context of the ScriptEngine and return the result
+    Q_INVOKABLE QScriptValue evaluate(const QString& program, const QString& fileName = QString(), int lineNumber = 1); // this is also used by the script tool widget
 
-    void setAvatarData(AvatarData* avatarData, const QString& objectName);
-    void setAvatarHashMap(AvatarHashMap* avatarHashMap, const QString& objectName);
-
-    bool isListeningToAudioStream() const { return _isListeningToAudioStream; }
-    void setIsListeningToAudioStream(bool isListeningToAudioStream) { _isListeningToAudioStream = isListeningToAudioStream; }
-
-    void setAvatarSound(Sound* avatarSound) { _avatarSound = avatarSound; }
-    bool isPlayingAvatarSound() const { return _avatarSound != NULL; }
-
-    void init();
-    void run(); /// runs continuously until Agent.stop() is called
-    void evaluate(); /// initializes the engine, and evaluates the script, but then returns control to caller
-
-    void timerFired();
-
-    bool hasScript() const { return !_scriptContents.isEmpty(); }
-
-    bool isFinished() const { return _isFinished; }
-    bool isRunning() const { return _isRunning; }
-    bool evaluatePending() const { return _evaluatesPending > 0; }
-
-    void setUserLoaded(bool isUserLoaded) { _isUserLoaded = isUserLoaded;  }
-    bool isUserLoaded() const { return _isUserLoaded; }
-    
-    void setIsAgent(bool isAgent) { _isAgent = isAgent; }
-
-    void setParentURL(const QString& parentURL) { _parentURL = parentURL;  }
-    
-    QString getFilename() const;
-    
-    static void stopAllScripts(QObject* application);
-    
-    void waitTillDoneRunning();
-
-    virtual void scriptContentsAvailable(const QUrl& url, const QString& scriptContents);
-    virtual void errorInLoadingScript(const QUrl& url);
+    /// if the script engine is not already running, this will download the URL and start the process of seting it up
+    /// to run... NOTE - this is used by Application currently to load the url. We don't really want it to be exposed 
+    /// to scripts. we may not need this to be invokable
+    void loadURL(const QUrl& scriptURL, bool reload);
 
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    // NOTE - these are intended to be public interfaces available to scripts 
     Q_INVOKABLE void addEventHandler(const EntityItemID& entityID, const QString& eventName, QScriptValue handler);
     Q_INVOKABLE void removeEventHandler(const EntityItemID& entityID, const QString& eventName, QScriptValue handler);
 
-public slots:
-    void loadURL(const QUrl& scriptURL, bool reload);
-    void stop();
+    Q_INVOKABLE void load(const QString& loadfile);
+    Q_INVOKABLE void include(const QStringList& includeFiles, QScriptValue callback = QScriptValue());
+    Q_INVOKABLE void include(const QString& includeFile, QScriptValue callback = QScriptValue());
 
-    QScriptValue evaluate(const QString& program, const QString& fileName = QString(), int lineNumber = 1);
-    QObject* setInterval(const QScriptValue& function, int intervalMS);
-    QObject* setTimeout(const QScriptValue& function, int timeoutMS);
-    void clearInterval(QObject* timer) { stopTimer(reinterpret_cast<QTimer*>(timer)); }
-    void clearTimeout(QObject* timer) { stopTimer(reinterpret_cast<QTimer*>(timer)); }
-    void include(const QStringList& includeFiles, QScriptValue callback = QScriptValue());
-    void include(const QString& includeFile, QScriptValue callback = QScriptValue());
-    void load(const QString& loadfile);
-    void print(const QString& message);
-    QUrl resolvePath(const QString& path) const;
+    Q_INVOKABLE QObject* setInterval(const QScriptValue& function, int intervalMS);
+    Q_INVOKABLE QObject* setTimeout(const QScriptValue& function, int timeoutMS);
+    Q_INVOKABLE void clearInterval(QObject* timer) { stopTimer(reinterpret_cast<QTimer*>(timer)); }
+    Q_INVOKABLE void clearTimeout(QObject* timer) { stopTimer(reinterpret_cast<QTimer*>(timer)); }
+    Q_INVOKABLE void print(const QString& message);
+    Q_INVOKABLE QUrl resolvePath(const QString& path) const;
 
-    void nodeKilled(SharedNodePointer node);
+    // Entity Script Related methods
+    Q_INVOKABLE void loadEntityScript(const EntityItemID& entityID, const QString& entityScript, bool forceRedownload = false); // will call the preload method once loaded
+    Q_INVOKABLE void unloadEntityScript(const EntityItemID& entityID); // will call unload method
+    Q_INVOKABLE void unloadAllEntityScripts();
+    Q_INVOKABLE void callEntityScriptMethod(const EntityItemID& entityID, const QString& methodName);
+    Q_INVOKABLE void callEntityScriptMethod(const EntityItemID& entityID, const QString& methodName, const MouseEvent& event);
+    Q_INVOKABLE void callEntityScriptMethod(const EntityItemID& entityID, const QString& methodName, const EntityItemID& otherID, const Collision& collision);
+
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    // NOTE - this is intended to be a public interface for Agent scripts, and local scripts, but not for EntityScripts
+    Q_INVOKABLE void stop();
+
+    bool isFinished() const { return _isFinished; } // used by Application and ScriptWidget
+    bool isRunning() const { return _isRunning; } // used by ScriptWidget
+
+    static void stopAllScripts(QObject* application); // used by Application on shutdown
+
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    // NOTE - These are the callback implementations for ScriptUser the get called by ScriptCache when the contents
+    // of a script are available.
+    virtual void scriptContentsAvailable(const QUrl& url, const QString& scriptContents);
+    virtual void errorInLoadingScript(const QUrl& url);
+
+    // These are currently used by Application to track if a script is user loaded or not. Consider finding a solution
+    // inside of Application so that the ScriptEngine class is not polluted by this notion
+    void setUserLoaded(bool isUserLoaded) { _isUserLoaded = isUserLoaded; }
+    bool isUserLoaded() const { return _isUserLoaded; }
+
+    // NOTE - this is used by the TypedArray implemetation. we need to review this for thread safety
+    ArrayBufferClass* getArrayBufferClass() { return _arrayBufferClass; }
 
 signals:
     void scriptLoaded(const QString& scriptFilename);
@@ -146,28 +159,24 @@ protected:
     bool _isRunning;
     int _evaluatesPending = 0;
     bool _isInitialized;
-    bool _isAvatar;
-    QTimer* _avatarIdentityTimer;
-    QTimer* _avatarBillboardTimer;
     QHash<QTimer*, QScriptValue> _timerFunctionMap;
-    bool _isListeningToAudioStream;
-    Sound* _avatarSound;
-    int _numAvatarSoundSentBytes;
-    bool _isAgent = false;
     QSet<QUrl> _includedURLs;
     bool _wantSignals = true;
-
+    QHash<EntityItemID, EntityScriptDetails> _entityScripts;
 private:
+    void init();
+    QString getFilename() const;
+    void waitTillDoneRunning();
+    bool evaluatePending() const { return _evaluatesPending > 0; }
+    void timerFired();
     void stopAllTimers();
-    void sendAvatarIdentityPacket();
-    void sendAvatarBillboardPacket();
+
+    void setParentURL(const QString& parentURL) { _parentURL = parentURL; }
 
     QObject* setupTimerWithInterval(const QScriptValue& function, int intervalMS, bool isSingleShot);
     void stopTimer(QTimer* timer);
 
     AbstractControllerScriptingInterface* _controllerScriptingInterface;
-    AvatarData* _avatarData;
-    QString _scriptName;
     QString _fileNameString;
     Quat _quatLibrary;
     Vec3 _vec3Library;
@@ -177,15 +186,15 @@ private:
 
     ArrayBufferClass* _arrayBufferClass;
 
-    QHash<QUuid, quint16> _outgoingScriptAudioSequenceNumbers;
     QHash<EntityItemID, RegisteredEventHandlers> _registeredHandlers;
     void generalHandler(const EntityItemID& entityID, const QString& eventName, std::function<QScriptValueList()> argGenerator);
+    Q_INVOKABLE void entityScriptContentAvailable(const EntityItemID& entityID, const QString& scriptOrURL, const QString& contents, bool isURL, bool success);
 
-private:
     static QSet<ScriptEngine*> _allKnownScriptEngines;
     static QMutex _allScriptsMutex;
     static bool _stoppingAllScripts;
     static bool _doneRunningThisScript;
+
 };
 
 #endif // hifi_ScriptEngine_h
diff --git a/tests/animation/src/AnimInverseKinematicsTests.cpp b/tests/animation/src/AnimInverseKinematicsTests.cpp
index 3958db1242..bb15a1d257 100644
--- a/tests/animation/src/AnimInverseKinematicsTests.cpp
+++ b/tests/animation/src/AnimInverseKinematicsTests.cpp
@@ -35,7 +35,6 @@ void makeTestFBXJoints(std::vector<FBXJoint>& fbxJoints) {
     joint.freeLineage.clear();
     joint.parentIndex = -1;
     joint.distanceToParent = 1.0f;
-    joint.boneRadius = 1.0f;
 
     joint.translation = origin;        // T
     joint.preTransform = glm::mat4();  // Roff * Rp
@@ -96,11 +95,11 @@ void makeTestFBXJoints(std::vector<FBXJoint>& fbxJoints) {
 
 void AnimInverseKinematicsTests::testSingleChain() {
     std::vector<FBXJoint> fbxJoints;
-    AnimPose offset;
-    makeTestFBXJoints(fbxJoints, offset);
+    makeTestFBXJoints(fbxJoints);
 
     // create a skeleton and doll
-    AnimSkeleton* skeleton = new AnimSkeleton(fbxJoints);
+    AnimPose offset;
+    AnimSkeleton* skeleton = new AnimSkeleton(fbxJoints, offset);
     AnimSkeleton::Pointer skeletonPtr(skeleton);
     AnimInverseKinematics ikDoll("doll");
     ikDoll.setSkeleton(skeletonPtr);
@@ -130,10 +129,13 @@ void AnimInverseKinematicsTests::testSingleChain() {
         //
         // A------>B------>C------>D
         //
-        int indexD = 3;
         glm::vec3 targetPosition(2.0f, 1.0f, 0.0f);
         glm::quat targetRotation = glm::angleAxis(PI / 2.0f, zAxis);
-        ikDoll.updateTarget(indexD, targetPosition, targetRotation);
+        AnimVariantMap varMap;
+        varMap.set("positionD", targetPosition);
+        varMap.set("rotationD", targetRotation);
+        ikDoll.setTargetVars("D", "positionD", "rotationD");
+        AnimNode::Triggers triggers;
 
         // the IK solution should be:
         //
@@ -143,7 +145,7 @@ void AnimInverseKinematicsTests::testSingleChain() {
         // A------>B------>C
         //
         float dt = 1.0f;
-        ikDoll.evaluate(dt);
+        ikDoll.evaluate(varMap, dt, triggers);
 
         // verify absolute results
         // NOTE: since we expect this solution to converge very quickly (one loop)
@@ -204,17 +206,20 @@ void AnimInverseKinematicsTests::testSingleChain() {
         //         |
         // A------>B               t
         //
-        int indexD = 3;
         glm::vec3 targetPosition(3.0f, 0.0f, 0.0f);
         glm::quat targetRotation = identity;
-        ikDoll.updateTarget(indexD, targetPosition, targetRotation);
+        AnimVariantMap varMap;
+        varMap.set("positionD", targetPosition);
+        varMap.set("rotationD", targetRotation);
+        ikDoll.setTargetVars("D", "positionD", "rotationD");
+        AnimNode::Triggers triggers;
 
         // the IK solution should be:
         //
         // A------>B------>C------>D
         //
         float dt = 1.0f;
-        ikDoll.evaluate(dt);
+        ikDoll.evaluate(varMap, dt, triggers);
 
         // verify absolute results
         // NOTE: the IK algorithm doesn't converge very fast for full-reach targets,
diff --git a/tests/animation/src/RotationConstraintTests.cpp b/tests/animation/src/RotationConstraintTests.cpp
index 4aac875f2a..7aacf26826 100644
--- a/tests/animation/src/RotationConstraintTests.cpp
+++ b/tests/animation/src/RotationConstraintTests.cpp
@@ -193,6 +193,7 @@ void RotationConstraintTests::testSwingTwistConstraint() {
                 glm::quat inputRotation = swingRotation * twistRotation * referenceRotation;
                 glm::quat outputRotation = inputRotation;
 
+                shoulder.clearHistory();
                 bool updated = shoulder.apply(outputRotation);
                 QVERIFY(updated == false);
                 QCOMPARE_WITH_ABS_ERROR(inputRotation, outputRotation, EPSILON);
@@ -223,6 +224,7 @@ void RotationConstraintTests::testSwingTwistConstraint() {
                 glm::quat inputRotation = swingRotation * twistRotation * referenceRotation;
                 glm::quat outputRotation = inputRotation;
 
+                shoulder.clearHistory();
                 bool updated = shoulder.apply(outputRotation);
                 QVERIFY(updated == true);
 
@@ -257,6 +259,7 @@ void RotationConstraintTests::testSwingTwistConstraint() {
                 glm::quat inputRotation = swingRotation * twistRotation * referenceRotation;
                 glm::quat outputRotation = inputRotation;
 
+                shoulder.clearHistory();
                 bool updated = shoulder.apply(outputRotation);
                 QVERIFY(updated == true);
 
@@ -291,6 +294,7 @@ void RotationConstraintTests::testSwingTwistConstraint() {
                 glm::quat inputRotation = swingRotation * twistRotation * referenceRotation;
                 glm::quat outputRotation = inputRotation;
 
+                shoulder.clearHistory();
                 bool updated = shoulder.apply(outputRotation);
                 QVERIFY(updated == true);
 
diff --git a/tests/animation/src/data/avatar.json b/tests/animation/src/data/avatar.json
index 08425201b0..72650893d7 100644
--- a/tests/animation/src/data/avatar.json
+++ b/tests/animation/src/data/avatar.json
@@ -52,190 +52,426 @@
                         "children": []
                     },
                     {
-                        "id": "mainStateMachine",
-                        "type": "stateMachine",
+                        "id": "rightHandOverlay",
+                        "type": "overlay",
                         "data": {
-                            "currentState": "idle",
-                            "states": [
-                                {
-                                    "id": "idle",
-                                    "interpTarget": 6,
-                                    "interpDuration": 6,
-                                    "transitions": [
-                                        { "var": "isMovingForward", "state": "walkFwd" },
-                                        { "var": "isMovingBackward", "state": "walkBwd" },
-                                        { "var": "isMovingRight", "state": "strafeRight" },
-                                        { "var": "isMovingLeft", "state": "strafeLeft" },
-                                        { "var": "isTurningRight", "state": "turnRight" },
-                                        { "var": "isTurningLeft", "state": "turnLeft" }
-                                    ]
-                                },
-                                {
-                                    "id": "walkFwd",
-                                    "interpTarget": 6,
-                                    "interpDuration": 6,
-                                    "transitions": [
-                                        { "var": "isNotMoving", "state": "idle" },
-                                        { "var": "isMovingBackward", "state": "walkBwd" },
-                                        { "var": "isMovingRight", "state": "strafeRight" },
-                                        { "var": "isMovingLeft", "state": "strafeLeft" },
-                                        { "var": "isTurningRight", "state": "turnRight" },
-                                        { "var": "isTurningLeft", "state": "turnLeft" }
-                                    ]
-                                },
-                                {
-                                    "id": "walkBwd",
-                                    "interpTarget": 6,
-                                    "interpDuration": 6,
-                                    "transitions": [
-                                        { "var": "isNotMoving", "state": "idle" },
-                                        { "var": "isMovingForward", "state": "walkFwd" },
-                                        { "var": "isMovingRight", "state": "strafeRight" },
-                                        { "var": "isMovingLeft", "state": "strafeLeft" },
-                                        { "var": "isTurningRight", "state": "turnRight" },
-                                        { "var": "isTurningLeft", "state": "turnLeft" }
-                                    ]
-                                },
-                                {
-                                    "id": "strafeRight",
-                                    "interpTarget": 6,
-                                    "interpDuration": 6,
-                                    "transitions": [
-                                        { "var": "isNotMoving", "state": "idle" },
-                                        { "var": "isMovingForward", "state": "walkFwd" },
-                                        { "var": "isMovingBackward", "state": "walkBwd" },
-                                        { "var": "isMovingLeft", "state": "strafeLeft" },
-                                        { "var": "isTurningRight", "state": "turnRight" },
-                                        { "var": "isTurningLeft", "state": "turnLeft" }
-                                    ]
-                                },
-                                {
-                                    "id": "strafeLeft",
-                                    "interpTarget": 6,
-                                    "interpDuration": 6,
-                                    "transitions": [
-                                        { "var": "isNotMoving", "state": "idle" },
-                                        { "var": "isMovingForward", "state": "walkFwd" },
-                                        { "var": "isMovingBackward", "state": "walkBwd" },
-                                        { "var": "isMovingRight", "state": "strafeRight" },
-                                        { "var": "isTurningRight", "state": "turnRight" },
-                                        { "var": "isTurningLeft", "state": "turnLeft" }
-                                    ]
-                                },
-                                {
-                                    "id": "turnRight",
-                                    "interpTarget": 6,
-                                    "interpDuration": 6,
-                                    "transitions": [
-                                        { "var": "isNotTurning", "state": "idle" },
-                                        { "var": "isMovingForward", "state": "walkFwd" },
-                                        { "var": "isMovingBackward", "state": "walkBwd" },
-                                        { "var": "isMovingRight", "state": "strafeRight" },
-                                        { "var": "isMovingLeft", "state": "strafeLeft" },
-                                        { "var": "isTurningLeft", "state": "turnLeft" }
-                                    ]
-                                },
-                                {
-                                    "id": "turnLeft",
-                                    "interpTarget": 6,
-                                    "interpDuration": 6,
-                                    "transitions": [
-                                        { "var": "isNotTurning", "state": "idle" },
-                                        { "var": "isMovingForward", "state": "walkFwd" },
-                                        { "var": "isMovingBackward", "state": "walkBwd" },
-                                        { "var": "isMovingRight", "state": "strafeRight" },
-                                        { "var": "isMovingLeft", "state": "strafeLeft" },
-                                        { "var": "isTurningRight", "state": "turnRight" }
-                                    ]
-                                }
-                            ]
+                            "alpha": 1.0,
+                            "boneSet": "rightHand",
+                            "alphaVar": "rightHandOverlayAlpha"
                         },
                         "children": [
                             {
-                                "id": "idle",
-                                "type": "clip",
+                                "id": "rightHandStateMachine",
+                                "type": "stateMachine",
                                 "data": {
-                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/idle.fbx",
-                                    "startFrame": 0.0,
-                                    "endFrame": 90.0,
-                                    "timeScale": 1.0,
-                                    "loopFlag": true
+                                    "currentState": "rightHandIdle",
+                                    "states": [
+                                        {
+                                            "id": "rightHandIdle",
+                                            "interpTarget": 3,
+                                            "interpDuration": 3,
+                                            "transitions": [
+                                                { "var": "isRightHandPoint", "state": "rightHandPointIntro" },
+                                                { "var": "isRightHandGrab", "state": "rightHandGrab" }
+                                            ]
+                                        },
+                                        {
+                                            "id": "rightHandPointIntro",
+                                            "interpTarget": 3,
+                                            "interpDuration": 3,
+                                            "transitions": [
+                                                { "var": "isRightHandIdle", "state": "rightHandIdle" },
+                                                { "var": "isRightHandPointIntroOnDone", "state": "rightHandPointHold" },
+                                                { "var": "isRightHandGrab", "state": "rightHandGrab" }
+                                            ]
+                                        },
+                                        {
+                                            "id": "rightHandPointHold",
+                                            "interpTarget": 3,
+                                            "interpDuration": 3,
+                                            "transitions": [
+                                                { "var": "isRightHandIdle", "state": "rightHandPointOutro" },
+                                                { "var": "isRightHandGrab", "state": "rightHandGrab" }
+                                            ]
+                                        },
+                                        {
+                                            "id": "rightHandPointOutro",
+                                            "interpTarget": 3,
+                                            "interpDuration": 3,
+                                            "transitions": [
+                                                { "var": "isRightHandPointOutroOnDone", "state": "rightHandIdle" },
+                                                { "var": "isRightHandGrab", "state": "rightHandGrab" },
+                                                { "var": "isRightHandPoint", "state": "rightHandPointHold" }
+                                            ]
+                                        },
+                                        {
+                                            "id": "rightHandGrab",
+                                            "interpTarget": 3,
+                                            "interpDuration": 3,
+                                            "transitions": [
+                                                { "var": "isRightHandIdle", "state": "rightHandIdle" },
+                                                { "var": "isRightHandPoint_DISABLED", "state": "rightHandPointHold" }
+                                            ]
+                                        }
+                                    ]
                                 },
-                                "children": []
+                                "children": [
+                                    {
+                                        "id": "rightHandIdle",
+                                        "type": "clip",
+                                        "data": {
+                                            "url": "http://hifi-public.s3.amazonaws.com/ozan/anim/hand_anims/right_hand_point.fbx",
+                                            "startFrame": 0.0,
+                                            "endFrame": 0.0,
+                                            "timeScale": 1.0,
+                                            "loopFlag": true
+                                        },
+                                        "children": []
+                                    },
+                                    {
+                                        "id": "rightHandPointHold",
+                                        "type": "clip",
+                                        "data": {
+                                            "url": "http://hifi-public.s3.amazonaws.com/ozan/anim/hand_anims/right_hand_point.fbx",
+                                            "startFrame": 12.0,
+                                            "endFrame": 12.0,
+                                            "timeScale": 1.0,
+                                            "loopFlag": true
+                                        },
+                                        "children": []
+                                    },
+                                    {
+                                        "id": "rightHandPointIntro",
+                                        "type": "clip",
+                                        "data": {
+                                            "url": "http://hifi-public.s3.amazonaws.com/ozan/anim/hand_anims/right_hand_point.fbx",
+                                            "startFrame": 0.0,
+                                            "endFrame": 12.0,
+                                            "timeScale": 1.0,
+                                            "loopFlag": false
+                                        },
+                                        "children": []
+                                    },
+                                    {
+                                        "id": "rightHandPointOutro",
+                                        "type": "clip",
+                                        "data": {
+                                            "url": "http://hifi-public.s3.amazonaws.com/ozan/anim/hand_anims/right_hand_point.fbx",
+                                            "startFrame": 0.0,
+                                            "endFrame": 65.0,
+                                            "timeScale": 1.0,
+                                            "loopFlag": false
+                                        },
+                                        "children": []
+                                    },
+                                    {
+                                        "id": "rightHandGrab",
+                                        "type": "blendLinear",
+                                        "data": {
+                                            "alpha": 0.0,
+                                            "alphaVar": "rightHandGrabBlend"
+                                        },
+                                        "children": [
+                                            {
+                                                "id": "rightHandOpen",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "http://hifi-public.s3.amazonaws.com/ozan/anim/hand_anims/right_hand_point.fbx",
+                                                    "startFrame": 0.0,
+                                                    "endFrame": 0.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true
+                                                },
+                                                "children": []
+                                            },
+                                            {
+                                                "id": "rightHandClose",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "http://hifi-public.s3.amazonaws.com/ozan/anim/squeeze_hands/right_hand_anim.fbx",
+                                                    "startFrame": 15.0,
+                                                    "endFrame": 15.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true
+                                                },
+                                                "children": []
+                                            }
+                                        ]
+                                    }
+                                ]
                             },
                             {
-                                "id": "walkFwd",
-                                "type": "clip",
+                                "id": "leftHandOverlay",
+                                "type": "overlay",
                                 "data": {
-                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/walk_fwd.fbx",
-                                    "startFrame": 0.0,
-                                    "endFrame": 35.0,
-                                    "timeScale": 1.0,
-                                    "loopFlag": true,
-                                    "timeScaleVar": "walkTimeScale"
+                                    "alpha": 1.0,
+                                    "boneSet": "leftHand",
+                                    "alphaVar" : "leftHandOverlay"
                                 },
-                                "children": []
-                            },
-                            {
-                                "id": "walkBwd",
-                                "type": "clip",
-                                "data": {
-                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/walk_bwd.fbx",
-                                    "startFrame": 0.0,
-                                    "endFrame": 37.0,
-                                    "timeScale": 1.0,
-                                    "loopFlag": true,
-                                    "timeScaleVar": "walkTimeScale"
-                                },
-                                "children": []
-                            },
-                            {
-                                "id": "turnLeft",
-                                "type": "clip",
-                                "data": {
-                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/turn_left.fbx",
-                                    "startFrame": 0.0,
-                                    "endFrame": 28.0,
-                                    "timeScale": 1.0,
-                                    "loopFlag": true
-                                },
-                                "children": []
-                            },
-                            {
-                                "id": "turnRight",
-                                "type": "clip",
-                                "data": {
-                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/turn_right.fbx",
-                                    "startFrame": 0.0,
-                                    "endFrame": 30.0,
-                                    "timeScale": 1.0,
-                                    "loopFlag": true
-                                },
-                                "children": []
-                            },
-                            {
-                                "id": "strafeLeft",
-                                "type": "clip",
-                                "data": {
-                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/strafe_left.fbx",
-                                    "startFrame": 0.0,
-                                    "endFrame": 31.0,
-                                    "timeScale": 1.0,
-                                    "loopFlag": true
-                                },
-                                "children": []
-                            },
-                            {
-                                "id": "strafeRight",
-                                "type": "clip",
-                                "data": {
-                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/strafe_right.fbx",
-                                    "startFrame": 0.0,
-                                    "endFrame": 31.0,
-                                    "timeScale": 1.0,
-                                    "loopFlag": true
-                                },
-                                "children": []
+                                "children": [
+                                    {
+                                        "id": "leftHandStateMachine",
+                                        "type": "stateMachine",
+                                        "data": {
+                                            "currentState": "leftHandIdle",
+                                            "states": [
+                                                {
+                                                    "id": "leftHandIdle",
+                                                    "interpTarget": 6,
+                                                    "interpDuration": 6,
+                                                    "transitions": [
+                                                        { "var": "isLeftHandPoint", "state": "leftHandPoint" },
+                                                        { "var": "isLeftHandGrab", "state": "leftHandGrab" }
+                                                    ]
+                                                },
+                                                {
+                                                    "id": "leftHandPoint",
+                                                    "interpTarget": 6,
+                                                    "interpDuration": 6,
+                                                    "transitions": [
+                                                        { "var": "isLeftHandIdle", "state": "leftHandIdle" },
+                                                        { "var": "isLeftHandGrab", "state": "leftHandGrab" }
+                                                    ]
+                                                },
+                                                {
+                                                    "id": "leftHandGrab",
+                                                    "interpTarget": 6,
+                                                    "interpDuration": 6,
+                                                    "transitions": [
+                                                        { "var": "isLeftHandIdle", "state": "leftHandIdle" },
+                                                        { "var": "isLeftHandPoint", "state": "leftHandPoint" }
+                                                    ]
+                                                }
+                                            ]
+                                        },
+                                        "children": [
+                                            {
+                                                "id": "leftHandIdle",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "http://hifi-public.s3.amazonaws.com/ozan/anim/squeeze_hands/left_hand_anim.fbx",
+                                                    "startFrame": 30.0,
+                                                    "endFrame": 30.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true
+                                                },
+                                                "children": []
+                                            },
+                                            {
+                                                "id": "leftHandPoint",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "http://hifi-public.s3.amazonaws.com/ozan/anim/squeeze_hands/left_hand_anim.fbx",
+                                                    "startFrame": 0.0,
+                                                    "endFrame": 0.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true
+                                                },
+                                                "children": []
+                                            },
+                                            {
+                                                "id": "leftHandGrab",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "http://hifi-public.s3.amazonaws.com/ozan/anim/squeeze_hands/left_hand_anim.fbx",
+                                                    "startFrame": 15.0,
+                                                    "endFrame": 15.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true
+                                                },
+                                                "children": []
+                                            }
+                                        ]
+                                    },
+                                    {
+                                        "id": "mainStateMachine",
+                                        "type": "stateMachine",
+                                        "data": {
+                                            "currentState": "idle",
+                                            "states": [
+                                                {
+                                                    "id": "idle",
+                                                    "interpTarget": 6,
+                                                    "interpDuration": 6,
+                                                    "transitions": [
+                                                        { "var": "isMovingForward", "state": "walkFwd" },
+                                                        { "var": "isMovingBackward", "state": "walkBwd" },
+                                                        { "var": "isMovingRight", "state": "strafeRight" },
+                                                        { "var": "isMovingLeft", "state": "strafeLeft" },
+                                                        { "var": "isTurningRight", "state": "turnRight" },
+                                                        { "var": "isTurningLeft", "state": "turnLeft" }
+                                                    ]
+                                                },
+                                                {
+                                                    "id": "walkFwd",
+                                                    "interpTarget": 6,
+                                                    "interpDuration": 6,
+                                                    "transitions": [
+                                                        { "var": "isNotMoving", "state": "idle" },
+                                                        { "var": "isMovingBackward", "state": "walkBwd" },
+                                                        { "var": "isMovingRight", "state": "strafeRight" },
+                                                        { "var": "isMovingLeft", "state": "strafeLeft" },
+                                                        { "var": "isTurningRight", "state": "turnRight" },
+                                                        { "var": "isTurningLeft", "state": "turnLeft" }
+                                                    ]
+                                                },
+                                                {
+                                                    "id": "walkBwd",
+                                                    "interpTarget": 6,
+                                                    "interpDuration": 6,
+                                                    "transitions": [
+                                                        { "var": "isNotMoving", "state": "idle" },
+                                                        { "var": "isMovingForward", "state": "walkFwd" },
+                                                        { "var": "isMovingRight", "state": "strafeRight" },
+                                                        { "var": "isMovingLeft", "state": "strafeLeft" },
+                                                        { "var": "isTurningRight", "state": "turnRight" },
+                                                        { "var": "isTurningLeft", "state": "turnLeft" }
+                                                    ]
+                                                },
+                                                {
+                                                    "id": "strafeRight",
+                                                    "interpTarget": 6,
+                                                    "interpDuration": 6,
+                                                    "transitions": [
+                                                        { "var": "isNotMoving", "state": "idle" },
+                                                        { "var": "isMovingForward", "state": "walkFwd" },
+                                                        { "var": "isMovingBackward", "state": "walkBwd" },
+                                                        { "var": "isMovingLeft", "state": "strafeLeft" },
+                                                        { "var": "isTurningRight", "state": "turnRight" },
+                                                        { "var": "isTurningLeft", "state": "turnLeft" }
+                                                    ]
+                                                },
+                                                {
+                                                    "id": "strafeLeft",
+                                                    "interpTarget": 6,
+                                                    "interpDuration": 6,
+                                                    "transitions": [
+                                                        { "var": "isNotMoving", "state": "idle" },
+                                                        { "var": "isMovingForward", "state": "walkFwd" },
+                                                        { "var": "isMovingBackward", "state": "walkBwd" },
+                                                        { "var": "isMovingRight", "state": "strafeRight" },
+                                                        { "var": "isTurningRight", "state": "turnRight" },
+                                                        { "var": "isTurningLeft", "state": "turnLeft" }
+                                                    ]
+                                                },
+                                                {
+                                                    "id": "turnRight",
+                                                    "interpTarget": 6,
+                                                    "interpDuration": 6,
+                                                    "transitions": [
+                                                        { "var": "isNotTurning", "state": "idle" },
+                                                        { "var": "isMovingForward", "state": "walkFwd" },
+                                                        { "var": "isMovingBackward", "state": "walkBwd" },
+                                                        { "var": "isMovingRight", "state": "strafeRight" },
+                                                        { "var": "isMovingLeft", "state": "strafeLeft" },
+                                                        { "var": "isTurningLeft", "state": "turnLeft" }
+                                                    ]
+                                                },
+                                                {
+                                                    "id": "turnLeft",
+                                                    "interpTarget": 6,
+                                                    "interpDuration": 6,
+                                                    "transitions": [
+                                                        { "var": "isNotTurning", "state": "idle" },
+                                                        { "var": "isMovingForward", "state": "walkFwd" },
+                                                        { "var": "isMovingBackward", "state": "walkBwd" },
+                                                        { "var": "isMovingRight", "state": "strafeRight" },
+                                                        { "var": "isMovingLeft", "state": "strafeLeft" },
+                                                        { "var": "isTurningRight", "state": "turnRight" }
+                                                    ]
+                                                }
+                                            ]
+                                        },
+                                        "children": [
+                                            {
+                                                "id": "idle",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/idle.fbx",
+                                                    "startFrame": 0.0,
+                                                    "endFrame": 90.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true
+                                                },
+                                                "children": []
+                                            },
+                                            {
+                                                "id": "walkFwd",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/walk_fwd.fbx",
+                                                    "startFrame": 0.0,
+                                                    "endFrame": 35.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true,
+                                                    "timeScaleVar": "walkTimeScale"
+                                                },
+                                                "children": []
+                                            },
+                                            {
+                                                "id": "walkBwd",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/walk_bwd.fbx",
+                                                    "startFrame": 0.0,
+                                                    "endFrame": 37.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true,
+                                                    "timeScaleVar": "walkTimeScale"
+                                                },
+                                                "children": []
+                                            },
+                                            {
+                                                "id": "turnLeft",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/turn_left.fbx",
+                                                    "startFrame": 0.0,
+                                                    "endFrame": 28.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true
+                                                },
+                                                "children": []
+                                            },
+                                            {
+                                                "id": "turnRight",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/turn_right.fbx",
+                                                    "startFrame": 0.0,
+                                                    "endFrame": 30.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true
+                                                },
+                                                "children": []
+                                            },
+                                            {
+                                                "id": "strafeLeft",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/strafe_left.fbx",
+                                                    "startFrame": 0.0,
+                                                    "endFrame": 31.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true
+                                                },
+                                                "children": []
+                                            },
+                                            {
+                                                "id": "strafeRight",
+                                                "type": "clip",
+                                                "data": {
+                                                    "url": "https://hifi-public.s3.amazonaws.com/ozan/anim/standard_anims/strafe_right.fbx",
+                                                    "startFrame": 0.0,
+                                                    "endFrame": 31.0,
+                                                    "timeScale": 1.0,
+                                                    "loopFlag": true
+                                                },
+                                                "children": []
+                                            }
+                                        ]
+                                    }
+                                ]
                             }
                         ]
                     }