diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index d78fc295a7..9517b69050 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -179,6 +179,8 @@
 #include "FrameTimingsScriptingInterface.h"
 #include <GPUIdent.h>
 #include <gl/GLHelpers.h>
+#include <EntityScriptClient.h>
+#include <ModelScriptingInterface.h>
 
 // On Windows PC, NVidia Optimus laptop, we want to enable NVIDIA GPU
 // FIXME seems to be broken.
@@ -4391,16 +4393,16 @@ void Application::update(float deltaTime) {
     myAvatar->clearDriveKeys();
     if (_myCamera.getMode() != CAMERA_MODE_INDEPENDENT) {
         if (!_controllerScriptingInterface->areActionsCaptured()) {
-            myAvatar->setDriveKeys(TRANSLATE_Z, -1.0f * userInputMapper->getActionState(controller::Action::TRANSLATE_Z));
-            myAvatar->setDriveKeys(TRANSLATE_Y, userInputMapper->getActionState(controller::Action::TRANSLATE_Y));
-            myAvatar->setDriveKeys(TRANSLATE_X, userInputMapper->getActionState(controller::Action::TRANSLATE_X));
+            myAvatar->setDriveKey(MyAvatar::TRANSLATE_Z, -1.0f * userInputMapper->getActionState(controller::Action::TRANSLATE_Z));
+            myAvatar->setDriveKey(MyAvatar::TRANSLATE_Y, userInputMapper->getActionState(controller::Action::TRANSLATE_Y));
+            myAvatar->setDriveKey(MyAvatar::TRANSLATE_X, userInputMapper->getActionState(controller::Action::TRANSLATE_X));
             if (deltaTime > FLT_EPSILON) {
-                myAvatar->setDriveKeys(PITCH, -1.0f * userInputMapper->getActionState(controller::Action::PITCH));
-                myAvatar->setDriveKeys(YAW, -1.0f * userInputMapper->getActionState(controller::Action::YAW));
-                myAvatar->setDriveKeys(STEP_YAW, -1.0f * userInputMapper->getActionState(controller::Action::STEP_YAW));
+                myAvatar->setDriveKey(MyAvatar::PITCH, -1.0f * userInputMapper->getActionState(controller::Action::PITCH));
+                myAvatar->setDriveKey(MyAvatar::YAW, -1.0f * userInputMapper->getActionState(controller::Action::YAW));
+                myAvatar->setDriveKey(MyAvatar::STEP_YAW, -1.0f * userInputMapper->getActionState(controller::Action::STEP_YAW));
             }
         }
-        myAvatar->setDriveKeys(ZOOM, userInputMapper->getActionState(controller::Action::TRANSLATE_CAMERA_Z));
+        myAvatar->setDriveKey(MyAvatar::ZOOM, userInputMapper->getActionState(controller::Action::TRANSLATE_CAMERA_Z));
     }
 
     controller::Pose leftHandPose = userInputMapper->getPoseState(controller::Action::LEFT_HAND);
@@ -5511,8 +5513,7 @@ void Application::registerScriptEngineWithApplicationServices(ScriptEngine* scri
     scriptEngine->registerGlobalObject("Rates", new RatesScriptingInterface(this));
 
     // hook our avatar and avatar hash map object into this script engine
-    scriptEngine->registerGlobalObject("MyAvatar", getMyAvatar().get());
-    qScriptRegisterMetaType(scriptEngine, audioListenModeToScriptValue, audioListenModeFromScriptValue);
+    getMyAvatar()->registerMetaTypes(scriptEngine);
 
     scriptEngine->registerGlobalObject("AvatarList", DependencyManager::get<AvatarManager>().data());
 
diff --git a/interface/src/Application.h b/interface/src/Application.h
index 653b724364..f7af922148 100644
--- a/interface/src/Application.h
+++ b/interface/src/Application.h
@@ -72,6 +72,8 @@
 
 #include <procedural/ProceduralSkybox.h>
 #include <model/Skybox.h>
+#include <ModelScriptingInterface.h>
+
 
 class OffscreenGLCanvas;
 class GLCanvas;
diff --git a/interface/src/Menu.cpp b/interface/src/Menu.cpp
index b95b4d28b9..977c5817e9 100644
--- a/interface/src/Menu.cpp
+++ b/interface/src/Menu.cpp
@@ -422,6 +422,9 @@ Menu::Menu() {
     }
 
     // Developer > Assets >>>
+    // Menu item is not currently needed but code should be kept in case it proves useful again at some stage.
+//#define WANT_ASSET_MIGRATION
+#ifdef WANT_ASSET_MIGRATION
     MenuWrapper* assetDeveloperMenu = developerMenu->addMenu("Assets");
     auto& atpMigrator = ATPAssetMigrator::getInstance();
     atpMigrator.setDialogParent(this);
@@ -429,6 +432,7 @@ Menu::Menu() {
     addActionToQMenuAndActionHash(assetDeveloperMenu, MenuOption::AssetMigration,
         0, &atpMigrator,
         SLOT(loadEntityServerFile()));
+#endif
 
     // Developer > Avatar >>>
     MenuWrapper* avatarDebugMenu = developerMenu->addMenu("Avatar");
@@ -561,16 +565,14 @@ Menu::Menu() {
             QString("../../hifi/tablet/TabletNetworkingPreferences.qml"), "NetworkingPreferencesDialog");
     });
     addActionToQMenuAndActionHash(networkMenu, MenuOption::ReloadContent, 0, qApp, SLOT(reloadResourceCaches()));
+    addActionToQMenuAndActionHash(networkMenu, MenuOption::ClearDiskCache, 0,
+        DependencyManager::get<AssetClient>().data(), SLOT(clearCache()));
     addCheckableActionToQMenuAndActionHash(networkMenu,
         MenuOption::DisableActivityLogger,
         0,
         false,
         &UserActivityLogger::getInstance(),
         SLOT(disable(bool)));
-    addActionToQMenuAndActionHash(networkMenu, MenuOption::CachesSize, 0,
-        dialogsManager.data(), SLOT(cachesSizeDialog()));
-    addActionToQMenuAndActionHash(networkMenu, MenuOption::DiskCacheEditor, 0,
-        dialogsManager.data(), SLOT(toggleDiskCacheEditor()));
     addActionToQMenuAndActionHash(networkMenu, MenuOption::ShowDSConnectTable, 0,
         qApp, SLOT(loadDomainConnectionDialog()));
 
diff --git a/interface/src/Menu.h b/interface/src/Menu.h
index c806ffa9ee..2cc4f39384 100644
--- a/interface/src/Menu.h
+++ b/interface/src/Menu.h
@@ -52,11 +52,11 @@ namespace MenuOption {
     const QString BinaryEyelidControl = "Binary Eyelid Control";
     const QString BookmarkLocation = "Bookmark Location";
     const QString Bookmarks = "Bookmarks";
-    const QString CachesSize = "RAM Caches Size";
     const QString CalibrateCamera = "Calibrate Camera";
     const QString CameraEntityMode = "Entity Mode";
     const QString CenterPlayerInView = "Center Player In View";
     const QString Chat = "Chat...";
+    const QString ClearDiskCache = "Clear Disk Cache";
     const QString Collisions = "Collisions";
     const QString Connexion = "Activate 3D Connexion Devices";
     const QString Console = "Console...";
@@ -83,7 +83,6 @@ namespace MenuOption {
     const QString DisableActivityLogger = "Disable Activity Logger";
     const QString DisableEyelidAdjustment = "Disable Eyelid Adjustment";
     const QString DisableLightEntities = "Disable Light Entities";
-    const QString DiskCacheEditor = "Disk Cache Editor";
     const QString DisplayCrashOptions = "Display Crash Options";
     const QString DisplayHandTargets = "Show Hand Targets";
     const QString DisplayModelBounds = "Display Model Bounds";
diff --git a/interface/src/avatar/MyAvatar.cpp b/interface/src/avatar/MyAvatar.cpp
index 318608e3a8..401378fff1 100644
--- a/interface/src/avatar/MyAvatar.cpp
+++ b/interface/src/avatar/MyAvatar.cpp
@@ -119,9 +119,7 @@ MyAvatar::MyAvatar(RigPointer rig) :
     using namespace recording;
     _skeletonModel->flagAsCauterized();
 
-    for (int i = 0; i < MAX_DRIVE_KEYS; i++) {
-        _driveKeys[i] = 0.0f;
-    }
+    clearDriveKeys();
 
     // Necessary to select the correct slot
     using SlotType = void(MyAvatar::*)(const glm::vec3&, bool, const glm::quat&, bool);
@@ -230,6 +228,21 @@ MyAvatar::~MyAvatar() {
     _lookAtTargetAvatar.reset();
 }
 
+void MyAvatar::registerMetaTypes(QScriptEngine* engine) {
+    QScriptValue value = engine->newQObject(this, QScriptEngine::QtOwnership, QScriptEngine::ExcludeDeleteLater | QScriptEngine::ExcludeChildObjects);
+    engine->globalObject().setProperty("MyAvatar", value);
+
+    QScriptValue driveKeys = engine->newObject();
+    auto metaEnum = QMetaEnum::fromType<DriveKeys>();
+    for (int i = 0; i < MAX_DRIVE_KEYS; ++i) {
+        driveKeys.setProperty(metaEnum.key(i), metaEnum.value(i));
+    }
+    engine->globalObject().setProperty("DriveKeys", driveKeys);
+
+    qScriptRegisterMetaType(engine, audioListenModeToScriptValue, audioListenModeFromScriptValue);
+    qScriptRegisterMetaType(engine, driveKeysToScriptValue, driveKeysFromScriptValue);
+}
+
 void MyAvatar::setOrientationVar(const QVariant& newOrientationVar) {
     Avatar::setOrientation(quatFromVariant(newOrientationVar));
 }
@@ -462,7 +475,7 @@ void MyAvatar::simulate(float deltaTime) {
         // When there are no step values, we zero out the last step pulse.
         // This allows a user to do faster snapping by tapping a control
         for (int i = STEP_TRANSLATE_X; !stepAction && i <= STEP_YAW; ++i) {
-            if (_driveKeys[i] != 0.0f) {
+            if (getDriveKey((DriveKeys)i) != 0.0f) {
                 stepAction = true;
             }
         }
@@ -1655,7 +1668,7 @@ bool MyAvatar::shouldRenderHead(const RenderArgs* renderArgs) const {
 void MyAvatar::updateOrientation(float deltaTime) {
 
     //  Smoothly rotate body with arrow keys
-    float targetSpeed = _driveKeys[YAW] * _yawSpeed;
+    float targetSpeed = getDriveKey(YAW) * _yawSpeed;
     if (targetSpeed != 0.0f) {
         const float ROTATION_RAMP_TIMESCALE = 0.1f;
         float blend = deltaTime / ROTATION_RAMP_TIMESCALE;
@@ -1684,8 +1697,8 @@ void MyAvatar::updateOrientation(float deltaTime) {
     // Comfort Mode: If you press any of the left/right rotation drive keys or input, you'll
     // get an instantaneous 15 degree turn. If you keep holding the key down you'll get another
     // snap turn every half second.
-    if (_driveKeys[STEP_YAW] != 0.0f) {
-        totalBodyYaw += _driveKeys[STEP_YAW];
+    if (getDriveKey(STEP_YAW) != 0.0f) {
+        totalBodyYaw += getDriveKey(STEP_YAW);
     }
 
     // use head/HMD orientation to turn while flying
@@ -1722,7 +1735,7 @@ void MyAvatar::updateOrientation(float deltaTime) {
     // update body orientation by movement inputs
     setOrientation(getOrientation() * glm::quat(glm::radians(glm::vec3(0.0f, totalBodyYaw, 0.0f))));
 
-    getHead()->setBasePitch(getHead()->getBasePitch() + _driveKeys[PITCH] * _pitchSpeed * deltaTime);
+    getHead()->setBasePitch(getHead()->getBasePitch() + getDriveKey(PITCH) * _pitchSpeed * deltaTime);
 
     if (qApp->isHMDMode()) {
         glm::quat orientation = glm::quat_cast(getSensorToWorldMatrix()) * getHMDSensorOrientation();
@@ -1756,14 +1769,14 @@ void MyAvatar::updateActionMotor(float deltaTime) {
     }
 
     // compute action input
-    glm::vec3 front = (_driveKeys[TRANSLATE_Z]) * IDENTITY_FRONT;
-    glm::vec3 right = (_driveKeys[TRANSLATE_X]) * IDENTITY_RIGHT;
+    glm::vec3 front = (getDriveKey(TRANSLATE_Z)) * IDENTITY_FRONT;
+    glm::vec3 right = (getDriveKey(TRANSLATE_X)) * IDENTITY_RIGHT;
 
     glm::vec3 direction = front + right;
     CharacterController::State state = _characterController.getState();
     if (state == CharacterController::State::Hover) {
         // we're flying --> support vertical motion
-        glm::vec3 up = (_driveKeys[TRANSLATE_Y]) * IDENTITY_UP;
+        glm::vec3 up = (getDriveKey(TRANSLATE_Y)) * IDENTITY_UP;
         direction += up;
     }
 
@@ -1802,7 +1815,7 @@ void MyAvatar::updateActionMotor(float deltaTime) {
         _actionMotorVelocity = MAX_WALKING_SPEED * direction;
     }
 
-    float boomChange = _driveKeys[ZOOM];
+    float boomChange = getDriveKey(ZOOM);
     _boomLength += 2.0f * _boomLength * boomChange + boomChange * boomChange;
     _boomLength = glm::clamp<float>(_boomLength, ZOOM_MIN, ZOOM_MAX);
 }
@@ -1833,11 +1846,11 @@ void MyAvatar::updatePosition(float deltaTime) {
     }
 
     // capture the head rotation, in sensor space, when the user first indicates they would like to move/fly.
-    if (!_hoverReferenceCameraFacingIsCaptured && (fabs(_driveKeys[TRANSLATE_Z]) > 0.1f || fabs(_driveKeys[TRANSLATE_X]) > 0.1f)) {
+    if (!_hoverReferenceCameraFacingIsCaptured && (fabs(getDriveKey(TRANSLATE_Z)) > 0.1f || fabs(getDriveKey(TRANSLATE_X)) > 0.1f)) {
         _hoverReferenceCameraFacingIsCaptured = true;
         // transform the camera facing vector into sensor space.
         _hoverReferenceCameraFacing = transformVectorFast(glm::inverse(_sensorToWorldMatrix), getHead()->getCameraOrientation() * Vectors::UNIT_Z);
-    } else if (_hoverReferenceCameraFacingIsCaptured && (fabs(_driveKeys[TRANSLATE_Z]) <= 0.1f && fabs(_driveKeys[TRANSLATE_X]) <= 0.1f)) {
+    } else if (_hoverReferenceCameraFacingIsCaptured && (fabs(getDriveKey(TRANSLATE_Z)) <= 0.1f && fabs(getDriveKey(TRANSLATE_X)) <= 0.1f)) {
         _hoverReferenceCameraFacingIsCaptured = false;
     }
 }
@@ -2093,17 +2106,61 @@ bool MyAvatar::getCharacterControllerEnabled() {
 }
 
 void MyAvatar::clearDriveKeys() {
-    for (int i = 0; i < MAX_DRIVE_KEYS; ++i) {
-        _driveKeys[i] = 0.0f;
+    _driveKeys.fill(0.0f);
+}
+
+void MyAvatar::setDriveKey(DriveKeys key, float val) {
+    try {
+        _driveKeys.at(key) = val;
+    } catch (const std::exception&) {
+        qCCritical(interfaceapp) << Q_FUNC_INFO << ": Index out of bounds";
+    }
+}
+
+float MyAvatar::getDriveKey(DriveKeys key) const {
+    return isDriveKeyDisabled(key) ? 0.0f : getRawDriveKey(key);
+}
+
+float MyAvatar::getRawDriveKey(DriveKeys key) const {
+    try {
+        return _driveKeys.at(key);
+    } catch (const std::exception&) {
+        qCCritical(interfaceapp) << Q_FUNC_INFO << ": Index out of bounds";
+        return 0.0f;
     }
 }
 
 void MyAvatar::relayDriveKeysToCharacterController() {
-    if (_driveKeys[TRANSLATE_Y] > 0.0f) {
+    if (getDriveKey(TRANSLATE_Y) > 0.0f) {
         _characterController.jump();
     }
 }
 
+void MyAvatar::disableDriveKey(DriveKeys key) {
+    try {
+        _disabledDriveKeys.set(key);
+    } catch (const std::exception&) {
+        qCCritical(interfaceapp) << Q_FUNC_INFO << ": Index out of bounds";
+    }
+}
+
+void MyAvatar::enableDriveKey(DriveKeys key) {
+    try {
+        _disabledDriveKeys.reset(key);
+    } catch (const std::exception&) {
+        qCCritical(interfaceapp) << Q_FUNC_INFO << ": Index out of bounds";
+    }
+}
+
+bool MyAvatar::isDriveKeyDisabled(DriveKeys key) const {
+    try {
+        return _disabledDriveKeys.test(key);
+    } catch (const std::exception&) {
+        qCCritical(interfaceapp) << Q_FUNC_INFO << ": Index out of bounds";
+        return true;
+    }
+}
+
 glm::vec3 MyAvatar::getWorldBodyPosition() const {
     return transformPoint(_sensorToWorldMatrix, extractTranslation(_bodySensorMatrix));
 }
@@ -2189,7 +2246,15 @@ QScriptValue audioListenModeToScriptValue(QScriptEngine* engine, const AudioList
 }
 
 void audioListenModeFromScriptValue(const QScriptValue& object, AudioListenerMode& audioListenerMode) {
-    audioListenerMode = (AudioListenerMode)object.toUInt16();
+    audioListenerMode = static_cast<AudioListenerMode>(object.toUInt16());
+}
+
+QScriptValue driveKeysToScriptValue(QScriptEngine* engine, const MyAvatar::DriveKeys& driveKeys) {
+    return driveKeys;
+}
+
+void driveKeysFromScriptValue(const QScriptValue& object, MyAvatar::DriveKeys& driveKeys) {
+    driveKeys = static_cast<MyAvatar::DriveKeys>(object.toUInt16());
 }
 
 
@@ -2382,7 +2447,7 @@ bool MyAvatar::didTeleport() {
 }
 
 bool MyAvatar::hasDriveInput() const {
-    return fabsf(_driveKeys[TRANSLATE_X]) > 0.0f || fabsf(_driveKeys[TRANSLATE_Y]) > 0.0f || fabsf(_driveKeys[TRANSLATE_Z]) > 0.0f;
+    return fabsf(getDriveKey(TRANSLATE_X)) > 0.0f || fabsf(getDriveKey(TRANSLATE_Y)) > 0.0f || fabsf(getDriveKey(TRANSLATE_Z)) > 0.0f;
 }
 
 void MyAvatar::setAway(bool value) {
@@ -2498,7 +2563,7 @@ bool MyAvatar::pinJoint(int index, const glm::vec3& position, const glm::quat& o
         return false;
     }
 
-    setPosition(position);
+    slamPosition(position);
     setOrientation(orientation);
 
     _rig->setMaxHipsOffsetLength(0.05f);
diff --git a/interface/src/avatar/MyAvatar.h b/interface/src/avatar/MyAvatar.h
index 00923e78cc..9bcec1134f 100644
--- a/interface/src/avatar/MyAvatar.h
+++ b/interface/src/avatar/MyAvatar.h
@@ -12,6 +12,8 @@
 #ifndef hifi_MyAvatar_h
 #define hifi_MyAvatar_h
 
+#include <bitset>
+
 #include <glm/glm.hpp>
 
 #include <SettingHandle.h>
@@ -29,20 +31,6 @@
 class AvatarActionHold;
 class ModelItemID;
 
-enum DriveKeys {
-    TRANSLATE_X = 0,
-    TRANSLATE_Y,
-    TRANSLATE_Z,
-    YAW,
-    STEP_TRANSLATE_X,
-    STEP_TRANSLATE_Y,
-    STEP_TRANSLATE_Z,
-    STEP_YAW,
-    PITCH,
-    ZOOM,
-    MAX_DRIVE_KEYS
-};
-
 enum eyeContactTarget {
     LEFT_EYE,
     RIGHT_EYE,
@@ -88,9 +76,26 @@ class MyAvatar : public Avatar {
     Q_PROPERTY(bool characterControllerEnabled READ getCharacterControllerEnabled WRITE setCharacterControllerEnabled)
 
 public:
+    enum DriveKeys {
+        TRANSLATE_X = 0,
+        TRANSLATE_Y,
+        TRANSLATE_Z,
+        YAW,
+        STEP_TRANSLATE_X,
+        STEP_TRANSLATE_Y,
+        STEP_TRANSLATE_Z,
+        STEP_YAW,
+        PITCH,
+        ZOOM,
+        MAX_DRIVE_KEYS
+    };
+    Q_ENUM(DriveKeys)
+
     explicit MyAvatar(RigPointer rig);
     ~MyAvatar();
 
+    void registerMetaTypes(QScriptEngine* engine);
+
     virtual void simulateAttachments(float deltaTime) override;
 
     AudioListenerMode getAudioListenerModeHead() const { return FROM_HEAD; }
@@ -180,9 +185,15 @@ public:
 
     //  Set what driving keys are being pressed to control thrust levels
     void clearDriveKeys();
-    void setDriveKeys(int key, float val) { _driveKeys[key] = val; };
+    void setDriveKey(DriveKeys key, float val);
+    float getDriveKey(DriveKeys key) const;
+    Q_INVOKABLE float getRawDriveKey(DriveKeys key) const;
     void relayDriveKeysToCharacterController();
 
+    Q_INVOKABLE void disableDriveKey(DriveKeys key);
+    Q_INVOKABLE void enableDriveKey(DriveKeys key);
+    Q_INVOKABLE bool isDriveKeyDisabled(DriveKeys key) const;
+
     eyeContactTarget getEyeContactTarget();
 
     Q_INVOKABLE glm::vec3 getTrackedHeadPosition() const { return _trackedHeadPosition; }
@@ -352,7 +363,6 @@ private:
     virtual bool shouldRenderHead(const RenderArgs* renderArgs) const override;
     void setShouldRenderLocally(bool shouldRender) { _shouldRender = shouldRender; setEnableMeshVisible(shouldRender); }
     bool getShouldRenderLocally() const { return _shouldRender; }
-    bool getDriveKeys(int key) { return _driveKeys[key] != 0.0f; };
     bool isMyAvatar() const override { return true; }
     virtual int parseDataFromBuffer(const QByteArray& buffer) override;
     virtual glm::vec3 getSkeletonPosition() const override;
@@ -388,7 +398,9 @@ private:
     void clampScaleChangeToDomainLimits(float desiredScale);
     glm::mat4 computeCameraRelativeHandControllerMatrix(const glm::mat4& controllerSensorMatrix) const;
 
-    float _driveKeys[MAX_DRIVE_KEYS];
+    std::array<float, MAX_DRIVE_KEYS> _driveKeys;
+    std::bitset<MAX_DRIVE_KEYS> _disabledDriveKeys;
+
     bool _wasPushing;
     bool _isPushing;
     bool _isBeingPushed;
@@ -541,4 +553,7 @@ private:
 QScriptValue audioListenModeToScriptValue(QScriptEngine* engine, const AudioListenerMode& audioListenerMode);
 void audioListenModeFromScriptValue(const QScriptValue& object, AudioListenerMode& audioListenerMode);
 
+QScriptValue driveKeysToScriptValue(QScriptEngine* engine, const MyAvatar::DriveKeys& driveKeys);
+void driveKeysFromScriptValue(const QScriptValue& object, MyAvatar::DriveKeys& driveKeys);
+
 #endif // hifi_MyAvatar_h
diff --git a/interface/src/ui/CachesSizeDialog.cpp b/interface/src/ui/CachesSizeDialog.cpp
deleted file mode 100644
index 935a6d126e..0000000000
--- a/interface/src/ui/CachesSizeDialog.cpp
+++ /dev/null
@@ -1,84 +0,0 @@
-//
-//  CachesSizeDialog.cpp
-//
-//
-//  Created by Clement on 1/12/15.
-//  Copyright 2015 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-#include <QDoubleSpinBox>
-#include <QFormLayout>
-#include <QPushButton>
-
-#include <AnimationCache.h>
-#include <DependencyManager.h>
-#include <GeometryCache.h>
-#include <SoundCache.h>
-#include <TextureCache.h>
-
-#include "CachesSizeDialog.h"
-
-
-QDoubleSpinBox* createDoubleSpinBox(QWidget* parent) {
-    QDoubleSpinBox* box = new QDoubleSpinBox(parent);
-    box->setDecimals(0);
-    box->setRange(MIN_UNUSED_MAX_SIZE / BYTES_PER_MEGABYTES, MAX_UNUSED_MAX_SIZE / BYTES_PER_MEGABYTES);
-    
-    return box;
-}
-
-CachesSizeDialog::CachesSizeDialog(QWidget* parent) :
-    QDialog(parent, Qt::Window | Qt::WindowCloseButtonHint)
-{
-    setWindowTitle("Caches Size");
-    
-    // Create layouter
-    QFormLayout* form = new QFormLayout(this);
-    setLayout(form);
-    
-    form->addRow("Animations cache size (MB):", _animations = createDoubleSpinBox(this));
-    form->addRow("Geometries cache size (MB):", _geometries = createDoubleSpinBox(this));
-    form->addRow("Sounds cache size (MB):", _sounds = createDoubleSpinBox(this));
-    form->addRow("Textures cache size (MB):", _textures = createDoubleSpinBox(this));
-    
-    resetClicked(true);
-    
-    // Add a button to reset
-    QPushButton* confirmButton = new QPushButton("Confirm", this);
-    QPushButton* resetButton = new QPushButton("Reset", this);
-    form->addRow(confirmButton, resetButton);
-    connect(confirmButton, SIGNAL(clicked(bool)), this, SLOT(confirmClicked(bool)));
-    connect(resetButton, SIGNAL(clicked(bool)), this, SLOT(resetClicked(bool)));
-}
-
-void CachesSizeDialog::confirmClicked(bool checked) {
-    DependencyManager::get<AnimationCache>()->setUnusedResourceCacheSize(_animations->value() * BYTES_PER_MEGABYTES);
-    DependencyManager::get<ModelCache>()->setUnusedResourceCacheSize(_geometries->value() * BYTES_PER_MEGABYTES);
-    DependencyManager::get<SoundCache>()->setUnusedResourceCacheSize(_sounds->value() * BYTES_PER_MEGABYTES);
-    // Disabling the texture cache because it's a liability in cases where we're overcommiting GPU memory
-#if 0
-    DependencyManager::get<TextureCache>()->setUnusedResourceCacheSize(_textures->value() * BYTES_PER_MEGABYTES);
-#endif
-    
-    QDialog::close();
-}
-
-void CachesSizeDialog::resetClicked(bool checked) {
-    _animations->setValue(DependencyManager::get<AnimationCache>()->getUnusedResourceCacheSize() / BYTES_PER_MEGABYTES);
-    _geometries->setValue(DependencyManager::get<ModelCache>()->getUnusedResourceCacheSize() / BYTES_PER_MEGABYTES);
-    _sounds->setValue(DependencyManager::get<SoundCache>()->getUnusedResourceCacheSize() / BYTES_PER_MEGABYTES);
-    _textures->setValue(DependencyManager::get<TextureCache>()->getUnusedResourceCacheSize() / BYTES_PER_MEGABYTES);
-}
-
-void CachesSizeDialog::reject() {
-    // Just regularly close upon ESC
-    QDialog::close();
-}
-
-void CachesSizeDialog::closeEvent(QCloseEvent* event) {
-    QDialog::closeEvent(event);
-    emit closed();
-}
diff --git a/interface/src/ui/CachesSizeDialog.h b/interface/src/ui/CachesSizeDialog.h
deleted file mode 100644
index 025d0f2bac..0000000000
--- a/interface/src/ui/CachesSizeDialog.h
+++ /dev/null
@@ -1,45 +0,0 @@
-//
-//  CachesSizeDialog.h
-//
-//
-//  Created by Clement on 1/12/15.
-//  Copyright 2015 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-#ifndef hifi_CachesSizeDialog_h
-#define hifi_CachesSizeDialog_h
-
-#include <QDialog>
-
-class QDoubleSpinBox;
-
-class CachesSizeDialog : public QDialog {
-    Q_OBJECT
-public:
-    // Sets up the UI
-    CachesSizeDialog(QWidget* parent);
-
-signals:
-    void closed();
-
-public slots:
-    void reject() override;
-    void confirmClicked(bool checked);
-    void resetClicked(bool checked);
-
-protected:
-    // Emits a 'closed' signal when this dialog is closed.
-    void closeEvent(QCloseEvent* event) override;
-
-private:
-    QDoubleSpinBox* _animations = nullptr;
-    QDoubleSpinBox* _geometries = nullptr;
-    QDoubleSpinBox* _scripts = nullptr;
-    QDoubleSpinBox* _sounds = nullptr;
-    QDoubleSpinBox* _textures = nullptr;
-};
-
-#endif // hifi_CachesSizeDialog_h
diff --git a/interface/src/ui/DialogsManager.cpp b/interface/src/ui/DialogsManager.cpp
index e52b1b6d9e..3bf7a54390 100644
--- a/interface/src/ui/DialogsManager.cpp
+++ b/interface/src/ui/DialogsManager.cpp
@@ -19,9 +19,7 @@
 #include <PathUtils.h>
 
 #include "AddressBarDialog.h"
-#include "CachesSizeDialog.h"
 #include "ConnectionFailureDialog.h"
-#include "DiskCacheEditor.h"
 #include "DomainConnectionDialog.h"
 #include "HMDToolsDialog.h"
 #include "LodToolsDialog.h"
@@ -70,11 +68,6 @@ void DialogsManager::setDomainConnectionFailureVisibility(bool visible) {
     }
 }
 
-void DialogsManager::toggleDiskCacheEditor() {
-    maybeCreateDialog(_diskCacheEditor);
-    _diskCacheEditor->toggle();
-}
-
 void DialogsManager::toggleLoginDialog() {
     LoginDialog::toggleAction();
 }
@@ -100,16 +93,6 @@ void DialogsManager::octreeStatsDetails() {
     _octreeStatsDialog->raise();
 }
 
-void DialogsManager::cachesSizeDialog() {
-    if (!_cachesSizeDialog) {
-        maybeCreateDialog(_cachesSizeDialog);
-
-        connect(_cachesSizeDialog, SIGNAL(closed()), _cachesSizeDialog, SLOT(deleteLater()));
-        _cachesSizeDialog->show();
-    }
-    _cachesSizeDialog->raise();
-}
-
 void DialogsManager::lodTools() {
     if (!_lodToolsDialog) {
         maybeCreateDialog(_lodToolsDialog);
diff --git a/interface/src/ui/DialogsManager.h b/interface/src/ui/DialogsManager.h
index 54aef38984..5f50b49d94 100644
--- a/interface/src/ui/DialogsManager.h
+++ b/interface/src/ui/DialogsManager.h
@@ -22,7 +22,6 @@
 class AnimationsDialog;
 class AttachmentsDialog;
 class CachesSizeDialog;
-class DiskCacheEditor;
 class LodToolsDialog;
 class OctreeStatsDialog;
 class ScriptEditorWindow;
@@ -46,11 +45,9 @@ public slots:
     void showAddressBar();
     void showFeed();
     void setDomainConnectionFailureVisibility(bool visible);
-    void toggleDiskCacheEditor();
     void toggleLoginDialog();
     void showLoginDialog();
     void octreeStatsDetails();
-    void cachesSizeDialog();
     void lodTools();
     void hmdTools(bool showTools);
     void showScriptEditor();
@@ -77,7 +74,6 @@ private:
     QPointer<AnimationsDialog> _animationsDialog;
     QPointer<AttachmentsDialog> _attachmentsDialog;
     QPointer<CachesSizeDialog> _cachesSizeDialog;
-    QPointer<DiskCacheEditor> _diskCacheEditor;
     QPointer<QMessageBox> _ircInfoBox;
     QPointer<HMDToolsDialog> _hmdToolsDialog;
     QPointer<LodToolsDialog> _lodToolsDialog;
diff --git a/interface/src/ui/DiskCacheEditor.cpp b/interface/src/ui/DiskCacheEditor.cpp
deleted file mode 100644
index 1a7be8642b..0000000000
--- a/interface/src/ui/DiskCacheEditor.cpp
+++ /dev/null
@@ -1,146 +0,0 @@
-//
-//  DiskCacheEditor.cpp
-//
-//
-//  Created by Clement on 3/4/15.
-//  Copyright 2015 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-#include "DiskCacheEditor.h"
-
-#include <QDebug>
-#include <QDialog>
-#include <QGridLayout>
-#include <QPushButton>
-#include <QLabel>
-#include <QTimer>
-#include <QMessageBox>
-
-#include <AssetClient.h>
-
-#include "OffscreenUi.h"
-
-DiskCacheEditor::DiskCacheEditor(QWidget* parent) : QObject(parent) {
-}
-
-QWindow* DiskCacheEditor::windowHandle() {
-    return (_dialog) ? _dialog->windowHandle() : nullptr;
-}
-
-void DiskCacheEditor::toggle() {
-    if (!_dialog) {
-        makeDialog();
-    }
-    
-    if (!_dialog->isActiveWindow()) {
-        _dialog->show();
-        _dialog->raise();
-        _dialog->activateWindow();
-    } else {
-        _dialog->close();
-    }
-}
-
-void DiskCacheEditor::makeDialog() {
-    _dialog = new QDialog(static_cast<QWidget*>(parent()));
-    Q_CHECK_PTR(_dialog);
-    _dialog->setAttribute(Qt::WA_DeleteOnClose);
-    _dialog->setWindowTitle("Disk Cache Editor");
-    
-    QGridLayout* layout = new QGridLayout(_dialog);
-    Q_CHECK_PTR(layout);
-    _dialog->setLayout(layout);
-    
-    
-    QLabel* path = new QLabel("Path : ", _dialog);
-    Q_CHECK_PTR(path);
-    path->setAlignment(Qt::AlignRight);
-    layout->addWidget(path, 0, 0);
-    
-    QLabel* size = new QLabel("Current Size : ", _dialog);
-    Q_CHECK_PTR(size);
-    size->setAlignment(Qt::AlignRight);
-    layout->addWidget(size, 1, 0);
-    
-    QLabel* maxSize = new QLabel("Max Size : ", _dialog);
-    Q_CHECK_PTR(maxSize);
-    maxSize->setAlignment(Qt::AlignRight);
-    layout->addWidget(maxSize, 2, 0);
-    
-    
-    _path = new QLabel(_dialog);
-    Q_CHECK_PTR(_path);
-    _path->setAlignment(Qt::AlignLeft);
-    layout->addWidget(_path, 0, 1, 1, 3);
-    
-    _size = new QLabel(_dialog);
-    Q_CHECK_PTR(_size);
-    _size->setAlignment(Qt::AlignLeft);
-    layout->addWidget(_size, 1, 1, 1, 3);
-    
-    _maxSize = new QLabel(_dialog);
-    Q_CHECK_PTR(_maxSize);
-    _maxSize->setAlignment(Qt::AlignLeft);
-    layout->addWidget(_maxSize, 2, 1, 1, 3);
-
-    refresh();
-
-
-    static const int REFRESH_INTERVAL = 100; // msec
-    _refreshTimer = new QTimer(_dialog);
-    _refreshTimer->setInterval(REFRESH_INTERVAL); // Qt::CoarseTimer acceptable, no need for real time accuracy
-    _refreshTimer->setSingleShot(false);
-    QObject::connect(_refreshTimer.data(), &QTimer::timeout, this, &DiskCacheEditor::refresh);
-    _refreshTimer->start();
-
-    QPushButton* clearCacheButton = new QPushButton(_dialog);
-    Q_CHECK_PTR(clearCacheButton);
-    clearCacheButton->setText("Clear");
-    clearCacheButton->setToolTip("Erases the entire content of the disk cache.");
-    connect(clearCacheButton, SIGNAL(clicked()), SLOT(clear()));
-    layout->addWidget(clearCacheButton, 3, 3);
-}
-
-void DiskCacheEditor::refresh() {
-    DependencyManager::get<AssetClient>()->cacheInfoRequest(this, "cacheInfoCallback");
-}
-
-void DiskCacheEditor::cacheInfoCallback(QString cacheDirectory, qint64 cacheSize, qint64 maximumCacheSize) {
-    static const auto stringify = [](qint64 number) {
-        static const QStringList UNITS = QStringList() << "B" << "KB" << "MB" << "GB";
-        static const qint64 CHUNK = 1024;
-        QString unit;
-        int i = 0;
-        for (i = 0; i < 4; ++i) {
-            if (number / CHUNK > 0) {
-                number /= CHUNK;
-            } else {
-                break;
-            }
-        }
-        return QString("%0 %1").arg(number).arg(UNITS[i]);
-    };
-    
-    if (_path) {
-        _path->setText(cacheDirectory);
-    }
-    if (_size) {
-        _size->setText(stringify(cacheSize));
-    }
-    if (_maxSize) {
-        _maxSize->setText(stringify(maximumCacheSize));
-    }
-}
-
-void DiskCacheEditor::clear() {
-    auto buttonClicked = OffscreenUi::question(_dialog, "Clearing disk cache",
-                                               "You are about to erase all the content of the disk cache, "
-                                               "are you sure you want to do that?",
-                                               QMessageBox::Ok | QMessageBox::Cancel);
-    if (buttonClicked == QMessageBox::Ok) {
-        DependencyManager::get<AssetClient>()->clearCache();
-    }
-}
diff --git a/interface/src/ui/DiskCacheEditor.h b/interface/src/ui/DiskCacheEditor.h
deleted file mode 100644
index 3f8fa1a883..0000000000
--- a/interface/src/ui/DiskCacheEditor.h
+++ /dev/null
@@ -1,49 +0,0 @@
-//
-//  DiskCacheEditor.h
-//
-//
-//  Created by Clement on 3/4/15.
-//  Copyright 2015 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-#ifndef hifi_DiskCacheEditor_h
-#define hifi_DiskCacheEditor_h
-
-#include <QObject>
-#include <QPointer>
-
-class QDialog;
-class QLabel;
-class QWindow;
-class QTimer;
-
-class DiskCacheEditor : public QObject {
-    Q_OBJECT
-    
-public:
-    DiskCacheEditor(QWidget* parent = nullptr);
-    
-    QWindow* windowHandle();
-    
-public slots:
-    void toggle();
-    
-private slots:
-    void refresh();
-    void cacheInfoCallback(QString cacheDirectory, qint64 cacheSize, qint64 maximumCacheSize);
-    void clear();
-
-private:
-    void makeDialog();
-    
-    QPointer<QDialog> _dialog;
-    QPointer<QLabel> _path;
-    QPointer<QLabel> _size;
-    QPointer<QLabel> _maxSize;
-    QPointer<QTimer> _refreshTimer;
-};
-
-#endif // hifi_DiskCacheEditor_h
\ No newline at end of file
diff --git a/libraries/audio-client/src/AudioClient.cpp b/libraries/audio-client/src/AudioClient.cpp
index c32b5600d9..fa5d0d24d5 100644
--- a/libraries/audio-client/src/AudioClient.cpp
+++ b/libraries/audio-client/src/AudioClient.cpp
@@ -160,7 +160,7 @@ AudioClient::AudioClient() :
     _loopbackAudioOutput(NULL),
     _loopbackOutputDevice(NULL),
     _inputRingBuffer(0),
-    _localInjectorsStream(0),
+    _localInjectorsStream(0, 1),
     _receivedAudioStream(RECEIVED_AUDIO_STREAM_CAPACITY_FRAMES),
     _isStereoInput(false),
     _outputStarveDetectionStartTimeMsec(0),
diff --git a/libraries/entities-renderer/src/EntityTreeRenderer.cpp b/libraries/entities-renderer/src/EntityTreeRenderer.cpp
index 3797fe0d49..b7eb3900bf 100644
--- a/libraries/entities-renderer/src/EntityTreeRenderer.cpp
+++ b/libraries/entities-renderer/src/EntityTreeRenderer.cpp
@@ -146,6 +146,7 @@ void EntityTreeRenderer::clear() {
 
 void EntityTreeRenderer::reloadEntityScripts() {
     _entitiesScriptEngine->unloadAllEntityScripts();
+    _entitiesScriptEngine->resetModuleCache();
     foreach(auto entity, _entitiesInScene) {
         if (!entity->getScript().isEmpty()) {
             _entitiesScriptEngine->loadEntityScript(entity->getEntityItemID(), entity->getScript(), true);
diff --git a/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.cpp b/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.cpp
index 7359a548fc..a29b6dc551 100644
--- a/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.cpp
+++ b/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.cpp
@@ -14,6 +14,7 @@
 #include <QByteArray>
 #include <QtConcurrent/QtConcurrentRun>
 #include <glm/gtx/transform.hpp>
+#include "ModelScriptingInterface.h"
 
 #if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC diagnostic push
@@ -53,6 +54,8 @@
 #include "PhysicalEntitySimulation.h"
 
 gpu::PipelinePointer RenderablePolyVoxEntityItem::_pipeline = nullptr;
+gpu::PipelinePointer RenderablePolyVoxEntityItem::_wireframePipeline = nullptr;
+
 const float MARCHING_CUBE_COLLISION_HULL_OFFSET = 0.5;
 
 
@@ -73,7 +76,7 @@ const float MARCHING_CUBE_COLLISION_HULL_OFFSET = 0.5;
   _meshDirty
 
   In RenderablePolyVoxEntityItem::render, these flags are checked and changes are propagated along the chain.
-  decompressVolumeData() is called to decompress _voxelData into _volData.  getMesh() is called to invoke the
+  decompressVolumeData() is called to decompress _voxelData into _volData.  recomputeMesh() is called to invoke the
   polyVox surface extractor to create _mesh (as well as set Simulation _dirtyFlags).  Because Simulation::DIRTY_SHAPE
   is set, isReadyToComputeShape() gets called and _shape is created either from _volData or _shape, depending on
   the surface style.
@@ -81,7 +84,7 @@ const float MARCHING_CUBE_COLLISION_HULL_OFFSET = 0.5;
   When a script changes _volData, compressVolumeDataAndSendEditPacket is called to update _voxelData and to
   send a packet to the entity-server.
 
-  decompressVolumeData, getMesh, computeShapeInfoWorker, and compressVolumeDataAndSendEditPacket are too expensive
+  decompressVolumeData, recomputeMesh, computeShapeInfoWorker, and compressVolumeDataAndSendEditPacket are too expensive
   to run on a thread that has other things to do.  These use QtConcurrent::run to spawn a thread.  As each thread
   finishes, it adjusts the dirty flags so that the next call to render() will kick off the next step.
 
@@ -682,7 +685,7 @@ void RenderablePolyVoxEntityItem::render(RenderArgs* args) {
     if (voxelDataDirty) {
         decompressVolumeData();
     } else if (volDataDirty) {
-        getMesh();
+        recomputeMesh();
     }
 
     model::MeshPointer mesh;
@@ -696,7 +699,7 @@ void RenderablePolyVoxEntityItem::render(RenderArgs* args) {
         !mesh->getIndexBuffer()._buffer) {
         return;
     }
-
+    
     if (!_pipeline) {
         gpu::ShaderPointer vertexShader = gpu::Shader::createVertex(std::string(polyvox_vert));
         gpu::ShaderPointer pixelShader = gpu::Shader::createPixel(std::string(polyvox_frag));
@@ -715,6 +718,13 @@ void RenderablePolyVoxEntityItem::render(RenderArgs* args) {
         state->setDepthTest(true, true, gpu::LESS_EQUAL);
 
         _pipeline = gpu::Pipeline::create(program, state);
+
+        auto wireframeState = std::make_shared<gpu::State>();
+        wireframeState->setCullMode(gpu::State::CULL_BACK);
+        wireframeState->setDepthTest(true, true, gpu::LESS_EQUAL);
+        wireframeState->setFillMode(gpu::State::FILL_LINE);
+
+        _wireframePipeline = gpu::Pipeline::create(program, wireframeState);
     }
 
     if (!_vertexFormat) {
@@ -725,7 +735,11 @@ void RenderablePolyVoxEntityItem::render(RenderArgs* args) {
     }
 
     gpu::Batch& batch = *args->_batch;
-    batch.setPipeline(_pipeline);
+
+    // Pick correct Pipeline
+    bool wireframe = (render::ShapeKey(args->_globalShapeKey).isWireframe());
+    auto pipeline = (wireframe ? _wireframePipeline : _pipeline);
+    batch.setPipeline(pipeline);
 
     Transform transform(voxelToWorldMatrix());
     batch.setModelTransform(transform);
@@ -762,7 +776,7 @@ void RenderablePolyVoxEntityItem::render(RenderArgs* args) {
         batch.setResourceTexture(2, DependencyManager::get<TextureCache>()->getWhiteTexture());
     }
 
-    int voxelVolumeSizeLocation = _pipeline->getProgram()->getUniforms().findLocation("voxelVolumeSize");
+    int voxelVolumeSizeLocation = pipeline->getProgram()->getUniforms().findLocation("voxelVolumeSize");
     batch._glUniform3f(voxelVolumeSizeLocation, voxelVolumeSize.x, voxelVolumeSize.y, voxelVolumeSize.z);
 
     batch.drawIndexed(gpu::TRIANGLES, (gpu::uint32)mesh->getNumIndices(), 0);
@@ -1199,7 +1213,7 @@ void RenderablePolyVoxEntityItem::copyUpperEdgesFromNeighbors() {
     }
 }
 
-void RenderablePolyVoxEntityItem::getMesh() {
+void RenderablePolyVoxEntityItem::recomputeMesh() {
     // use _volData to make a renderable mesh
     PolyVoxSurfaceStyle voxelSurfaceStyle;
     withReadLock([&] {
@@ -1269,12 +1283,20 @@ void RenderablePolyVoxEntityItem::getMesh() {
                                            vertexBufferPtr->getSize() ,
                                            sizeof(PolyVox::PositionMaterialNormal),
                                            gpu::Element(gpu::VEC3, gpu::FLOAT, gpu::RAW)));
+
+        std::vector<model::Mesh::Part> parts;
+        parts.emplace_back(model::Mesh::Part((model::Index)0, // startIndex
+                                             (model::Index)vecIndices.size(), // numIndices
+                                             (model::Index)0, // baseVertex
+                                             model::Mesh::TRIANGLES)); // topology
+        mesh->setPartBuffer(gpu::BufferView(new gpu::Buffer(parts.size() * sizeof(model::Mesh::Part),
+                                                            (gpu::Byte*) parts.data()), gpu::Element::PART_DRAWCALL));
         entity->setMesh(mesh);
     });
 }
 
 void RenderablePolyVoxEntityItem::setMesh(model::MeshPointer mesh) {
-    // this catches the payload from getMesh
+    // this catches the payload from recomputeMesh
     bool neighborsNeedUpdate;
     withWriteLock([&] {
         if (!_collisionless) {
@@ -1531,7 +1553,6 @@ std::shared_ptr<RenderablePolyVoxEntityItem> RenderablePolyVoxEntityItem::getZPN
     return std::dynamic_pointer_cast<RenderablePolyVoxEntityItem>(_zPNeighbor.lock());
 }
 
-
 void RenderablePolyVoxEntityItem::bonkNeighbors() {
     // flag neighbors to the negative of this entity as needing to rebake their meshes.
     cacheNeighbors();
@@ -1551,7 +1572,6 @@ void RenderablePolyVoxEntityItem::bonkNeighbors() {
     }
 }
 
-
 void RenderablePolyVoxEntityItem::locationChanged(bool tellPhysics) {
     EntityItem::locationChanged(tellPhysics);
     if (!_pipeline || !render::Item::isValidID(_myItem)) {
@@ -1563,3 +1583,17 @@ void RenderablePolyVoxEntityItem::locationChanged(bool tellPhysics) {
 
     scene->enqueuePendingChanges(pendingChanges);
 }
+
+bool RenderablePolyVoxEntityItem::getMeshAsScriptValue(QScriptEngine *engine, QScriptValue& result) const {
+    bool success = false;
+    MeshProxy* meshProxy = nullptr;
+    model::MeshPointer mesh = nullptr;
+    withReadLock([&] {
+        if (_meshInitialized) {
+            success = true;
+            meshProxy = new MeshProxy(_mesh);
+        }
+    });
+    result = meshToScriptValue(engine, meshProxy);
+    return success;
+}
diff --git a/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.h b/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.h
index 45842c2fb9..363cd45a9d 100644
--- a/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.h
+++ b/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.h
@@ -133,6 +133,7 @@ public:
     QByteArray volDataToArray(quint16 voxelXSize, quint16 voxelYSize, quint16 voxelZSize) const;
 
     void setMesh(model::MeshPointer mesh);
+    bool getMeshAsScriptValue(QScriptEngine *engine, QScriptValue& result) const override;
     void setCollisionPoints(ShapeInfo::PointCollection points, AABox box);
     PolyVox::SimpleVolume<uint8_t>* getVolData() { return _volData; }
 
@@ -163,11 +164,12 @@ private:
     const int MATERIAL_GPU_SLOT = 3;
     render::ItemID _myItem{ render::Item::INVALID_ITEM_ID };
     static gpu::PipelinePointer _pipeline;
+    static gpu::PipelinePointer _wireframePipeline;
 
     ShapeInfo _shapeInfo;
 
     PolyVox::SimpleVolume<uint8_t>* _volData = nullptr;
-    bool _volDataDirty = false; // does getMesh need to be called?
+    bool _volDataDirty = false; // does recomputeMesh need to be called?
     int _onCount; // how many non-zero voxels are in _volData
 
     bool _neighborsNeedUpdate { false };
@@ -178,7 +180,7 @@ private:
     // these are run off the main thread
     void decompressVolumeData();
     void compressVolumeDataAndSendEditPacket();
-    virtual void getMesh() override; // recompute mesh
+    virtual void recomputeMesh() override; // recompute mesh
     void computeShapeInfoWorker();
 
     // these are cached lookups of _xNNeighborID, _yNNeighborID, _zNNeighborID, _xPNeighborID, _yPNeighborID, _zPNeighborID
diff --git a/libraries/entities-renderer/src/RenderableShapeEntityItem.cpp b/libraries/entities-renderer/src/RenderableShapeEntityItem.cpp
index c3e097382c..1ad60bf7c6 100644
--- a/libraries/entities-renderer/src/RenderableShapeEntityItem.cpp
+++ b/libraries/entities-renderer/src/RenderableShapeEntityItem.cpp
@@ -114,13 +114,22 @@ void RenderableShapeEntityItem::render(RenderArgs* args) {
         auto outColor = _procedural->getColor(color);
         outColor.a *= _procedural->isFading() ? Interpolate::calculateFadeRatio(_procedural->getFadeStartTime()) : 1.0f;
         batch._glColor4f(outColor.r, outColor.g, outColor.b, outColor.a);
-        DependencyManager::get<GeometryCache>()->renderShape(batch, MAPPING[_shape]);
+        if (render::ShapeKey(args->_globalShapeKey).isWireframe()) {
+            DependencyManager::get<GeometryCache>()->renderWireShape(batch, MAPPING[_shape]);
+        } else {
+            DependencyManager::get<GeometryCache>()->renderShape(batch, MAPPING[_shape]);
+        }
     } else {
         // FIXME, support instanced multi-shape rendering using multidraw indirect
         color.a *= _isFading ? Interpolate::calculateFadeRatio(_fadeStartTime) : 1.0f;
         auto geometryCache = DependencyManager::get<GeometryCache>();
         auto pipeline = color.a < 1.0f ? geometryCache->getTransparentShapePipeline() : geometryCache->getOpaqueShapePipeline();
-        geometryCache->renderSolidShapeInstance(batch, MAPPING[_shape], color, pipeline);
+        
+        if (render::ShapeKey(args->_globalShapeKey).isWireframe()) {
+            geometryCache->renderWireShapeInstance(batch, MAPPING[_shape], color, pipeline);
+        } else {
+            geometryCache->renderSolidShapeInstance(batch, MAPPING[_shape], color, pipeline);
+        }
     }
 
     static const auto triCount = DependencyManager::get<GeometryCache>()->getShapeTriangleCount(MAPPING[_shape]);
diff --git a/libraries/entities/src/EntitiesScriptEngineProvider.h b/libraries/entities/src/EntitiesScriptEngineProvider.h
index 69bf73e688..d87dd105c2 100644
--- a/libraries/entities/src/EntitiesScriptEngineProvider.h
+++ b/libraries/entities/src/EntitiesScriptEngineProvider.h
@@ -15,11 +15,13 @@
 #define hifi_EntitiesScriptEngineProvider_h
 
 #include <QtCore/QString>
+#include <QFuture>
 #include "EntityItemID.h"
 
 class EntitiesScriptEngineProvider {
 public:
     virtual void callEntityScriptMethod(const EntityItemID& entityID, const QString& methodName, const QStringList& params = QStringList()) = 0;
+    virtual QFuture<QVariant> getLocalEntityScriptDetails(const EntityItemID& entityID) = 0;
 };
 
-#endif // hifi_EntitiesScriptEngineProvider_h
\ No newline at end of file
+#endif // hifi_EntitiesScriptEngineProvider_h
diff --git a/libraries/entities/src/EntityScriptingInterface.cpp b/libraries/entities/src/EntityScriptingInterface.cpp
index 540eba4511..91d39e9490 100644
--- a/libraries/entities/src/EntityScriptingInterface.cpp
+++ b/libraries/entities/src/EntityScriptingInterface.cpp
@@ -10,6 +10,9 @@
 //
 #include "EntityScriptingInterface.h"
 
+#include <QFutureWatcher>
+#include <QtConcurrent/QtConcurrentRun>
+
 #include "EntityItemID.h"
 #include <VariantMapToScriptValue.h>
 #include <SharedUtil.h>
@@ -680,6 +683,118 @@ bool EntityScriptingInterface::reloadServerScripts(QUuid entityID) {
     return client->reloadServerScript(entityID);
 }
 
+bool EntityPropertyMetadataRequest::script(EntityItemID entityID, QScriptValue handler) {
+    using LocalScriptStatusRequest = QFutureWatcher<QVariant>;
+
+    LocalScriptStatusRequest* request = new LocalScriptStatusRequest;
+    QObject::connect(request, &LocalScriptStatusRequest::finished, _engine, [=]() mutable {
+        auto details = request->result().toMap();
+        QScriptValue err, result;
+        if (details.contains("isError")) {
+            if (!details.contains("message")) {
+                details["message"] = details["errorInfo"];
+            }
+            err = _engine->makeError(_engine->toScriptValue(details));
+        } else {
+            details["success"] = true;
+            result = _engine->toScriptValue(details);
+        }
+        callScopedHandlerObject(handler, err, result);
+        request->deleteLater();
+    });
+    auto entityScriptingInterface = DependencyManager::get<EntityScriptingInterface>();
+    entityScriptingInterface->withEntitiesScriptEngine([&](EntitiesScriptEngineProvider* entitiesScriptEngine) {
+        if (entitiesScriptEngine) {
+            request->setFuture(entitiesScriptEngine->getLocalEntityScriptDetails(entityID));
+        }
+    });
+    if (!request->isStarted()) {
+        request->deleteLater();
+        callScopedHandlerObject(handler, _engine->makeError("Entities Scripting Provider unavailable", "InternalError"), QScriptValue());
+        return false;
+    }
+    return true;
+}
+
+bool EntityPropertyMetadataRequest::serverScripts(EntityItemID entityID, QScriptValue handler) {
+    auto client = DependencyManager::get<EntityScriptClient>();
+    auto request = client->createScriptStatusRequest(entityID);
+    QPointer<BaseScriptEngine> engine = _engine;
+    QObject::connect(request, &GetScriptStatusRequest::finished, _engine, [=](GetScriptStatusRequest* request) mutable {
+        auto engine = _engine;
+        if (!engine) {
+            qCDebug(entities) << __FUNCTION__ << " -- engine destroyed while inflight" << entityID;
+            return;
+        }
+        QVariantMap details;
+        details["success"] = request->getResponseReceived();
+        details["isRunning"] = request->getIsRunning();
+        details["status"] = EntityScriptStatus_::valueToKey(request->getStatus()).toLower();
+        details["errorInfo"] = request->getErrorInfo();
+
+        QScriptValue err, result;
+        if (!details["success"].toBool()) {
+            if (!details.contains("message") && details.contains("errorInfo")) {
+                details["message"] = details["errorInfo"];
+            }
+            if (details["message"].toString().isEmpty()) {
+                details["message"] = "entity server script details not found";
+            }
+            err = engine->makeError(engine->toScriptValue(details));
+        } else {
+            result = engine->toScriptValue(details);
+        }
+        callScopedHandlerObject(handler, err, result);
+        request->deleteLater();
+    });
+    request->start();
+    return true;
+}
+
+bool EntityScriptingInterface::queryPropertyMetadata(QUuid entityID, QScriptValue property, QScriptValue scopeOrCallback, QScriptValue methodOrName) {
+    auto name = property.toString();
+    auto handler = makeScopedHandlerObject(scopeOrCallback, methodOrName);
+    QPointer<BaseScriptEngine> engine = dynamic_cast<BaseScriptEngine*>(handler.engine());
+    if (!engine) {
+        qCDebug(entities) << "queryPropertyMetadata without detectable engine" << entityID << name;
+        return false;
+    }
+#ifdef DEBUG_ENGINE_STATE
+    connect(engine, &QObject::destroyed, this, [=]() {
+        qDebug() << "queryPropertyMetadata -- engine destroyed!" << (!engine ? "nullptr" : "engine");
+    });
+#endif
+    if (!handler.property("callback").isFunction()) {
+        qDebug() << "!handler.callback.isFunction" << engine;
+        engine->raiseException(engine->makeError("callback is not a function", "TypeError"));
+        return false;
+    }
+
+    // NOTE: this approach is a work-in-progress and for now just meant to work 100% correctly and provide
+    // some initial structure for organizing metadata adapters around.
+
+    // The extra layer of indirection is *essential* because in real world conditions errors are often introduced
+    // by accident and sometimes without exact memory of "what just changed."
+
+    // Here the scripter only needs to know an entityID and a property name -- which means all scripters can
+    // level this method when stuck in dead-end scenarios or to learn more about "magic" Entity properties
+    // like .script that work in terms of side-effects.
+
+    // This is an async callback pattern -- so if needed C++ can easily throttle or restrict queries later.
+
+    EntityPropertyMetadataRequest request(engine);
+
+    if (name == "script") {
+        return request.script(entityID, handler);
+    } else if (name == "serverScripts") {
+        return request.serverScripts(entityID, handler);
+    } else {
+        engine->raiseException(engine->makeError("metadata for property " + name + " is not yet queryable"));
+        engine->maybeEmitUncaughtException(__FUNCTION__);
+        return false;
+    }
+}
+
 bool EntityScriptingInterface::getServerScriptStatus(QUuid entityID, QScriptValue callback) {
     auto client = DependencyManager::get<EntityScriptClient>();
     auto request = client->createScriptStatusRequest(entityID);
@@ -815,8 +930,7 @@ void RayToEntityIntersectionResultFromScriptValue(const QScriptValue& object, Ra
     }
 }
 
-bool EntityScriptingInterface::setVoxels(QUuid entityID,
-                                         std::function<bool(PolyVoxEntityItem&)> actor) {
+bool EntityScriptingInterface::polyVoxWorker(QUuid entityID, std::function<bool(PolyVoxEntityItem&)> actor) {
     PROFILE_RANGE(script_entities, __FUNCTION__);
 
     if (!_entityTree) {
@@ -882,11 +996,9 @@ bool EntityScriptingInterface::setPoints(QUuid entityID, std::function<bool(Line
     return success;
 }
 
-
 bool EntityScriptingInterface::setVoxelSphere(QUuid entityID, const glm::vec3& center, float radius, int value) {
     PROFILE_RANGE(script_entities, __FUNCTION__);
-
-    return setVoxels(entityID, [center, radius, value](PolyVoxEntityItem& polyVoxEntity) {
+    return polyVoxWorker(entityID, [center, radius, value](PolyVoxEntityItem& polyVoxEntity) {
         return polyVoxEntity.setSphere(center, radius, value);
     });
 }
@@ -896,7 +1008,7 @@ bool EntityScriptingInterface::setVoxelCapsule(QUuid entityID,
                                                float radius, int value) {
     PROFILE_RANGE(script_entities, __FUNCTION__);
 
-    return setVoxels(entityID, [start, end, radius, value](PolyVoxEntityItem& polyVoxEntity) {
+    return polyVoxWorker(entityID, [start, end, radius, value](PolyVoxEntityItem& polyVoxEntity) {
         return polyVoxEntity.setCapsule(start, end, radius, value);
     });
 }
@@ -904,7 +1016,7 @@ bool EntityScriptingInterface::setVoxelCapsule(QUuid entityID,
 bool EntityScriptingInterface::setVoxel(QUuid entityID, const glm::vec3& position, int value) {
     PROFILE_RANGE(script_entities, __FUNCTION__);
 
-    return setVoxels(entityID, [position, value](PolyVoxEntityItem& polyVoxEntity) {
+    return polyVoxWorker(entityID, [position, value](PolyVoxEntityItem& polyVoxEntity) {
         return polyVoxEntity.setVoxelInVolume(position, value);
     });
 }
@@ -912,7 +1024,7 @@ bool EntityScriptingInterface::setVoxel(QUuid entityID, const glm::vec3& positio
 bool EntityScriptingInterface::setAllVoxels(QUuid entityID, int value) {
     PROFILE_RANGE(script_entities, __FUNCTION__);
 
-    return setVoxels(entityID, [value](PolyVoxEntityItem& polyVoxEntity) {
+    return polyVoxWorker(entityID, [value](PolyVoxEntityItem& polyVoxEntity) {
         return polyVoxEntity.setAll(value);
     });
 }
@@ -921,11 +1033,23 @@ bool EntityScriptingInterface::setVoxelsInCuboid(QUuid entityID, const glm::vec3
                                                  const glm::vec3& cuboidSize, int value) {
     PROFILE_RANGE(script_entities, __FUNCTION__);
 
-    return setVoxels(entityID, [lowPosition, cuboidSize, value](PolyVoxEntityItem& polyVoxEntity) {
+    return polyVoxWorker(entityID, [lowPosition, cuboidSize, value](PolyVoxEntityItem& polyVoxEntity) {
         return polyVoxEntity.setCuboid(lowPosition, cuboidSize, value);
     });
 }
 
+void EntityScriptingInterface::voxelsToMesh(QUuid entityID, QScriptValue callback) {
+    PROFILE_RANGE(script_entities, __FUNCTION__);
+
+    polyVoxWorker(entityID, [callback](PolyVoxEntityItem& polyVoxEntity) mutable {
+        QScriptValue mesh;
+        polyVoxEntity.getMeshAsScriptValue(callback.engine(), mesh);
+        QScriptValueList args { mesh };
+        callback.call(QScriptValue(), args);
+        return true;
+    });
+}
+
 bool EntityScriptingInterface::setAllPoints(QUuid entityID, const QVector<glm::vec3>& points) {
     PROFILE_RANGE(script_entities, __FUNCTION__);
 
diff --git a/libraries/entities/src/EntityScriptingInterface.h b/libraries/entities/src/EntityScriptingInterface.h
index e9f0637830..c21e9807e8 100644
--- a/libraries/entities/src/EntityScriptingInterface.h
+++ b/libraries/entities/src/EntityScriptingInterface.h
@@ -34,7 +34,23 @@
 #include "EntitiesScriptEngineProvider.h"
 #include "EntityItemProperties.h"
 
+#include "BaseScriptEngine.h"
+
 class EntityTree;
+class MeshProxy;
+
+// helper factory to compose standardized, async metadata queries for "magic" Entity properties
+// like .script and .serverScripts.  This is used for automated testing of core scripting features
+// as well as to provide early adopters a self-discoverable, consistent way to diagnose common
+// problems with their own Entity scripts.
+class EntityPropertyMetadataRequest {
+public:
+    EntityPropertyMetadataRequest(BaseScriptEngine* engine) : _engine(engine) {};
+    bool script(EntityItemID entityID, QScriptValue handler);
+    bool serverScripts(EntityItemID entityID, QScriptValue handler);
+private:
+    QPointer<BaseScriptEngine> _engine;
+};
 
 class RayToEntityIntersectionResult {
 public:
@@ -67,6 +83,7 @@ class EntityScriptingInterface : public OctreeScriptingInterface, public Depende
     Q_PROPERTY(float costMultiplier READ getCostMultiplier WRITE setCostMultiplier)
     Q_PROPERTY(QUuid keyboardFocusEntity READ getKeyboardFocusEntity WRITE setKeyboardFocusEntity)
 
+    friend EntityPropertyMetadataRequest;
 public:
     EntityScriptingInterface(bool bidOnSimulationOwnership);
 
@@ -211,6 +228,26 @@ public slots:
     Q_INVOKABLE RayToEntityIntersectionResult findRayIntersectionBlocking(const PickRay& ray, bool precisionPicking = false, const QScriptValue& entityIdsToInclude = QScriptValue(), const QScriptValue& entityIdsToDiscard = QScriptValue());
 
     Q_INVOKABLE bool reloadServerScripts(QUuid entityID);
+
+    /**jsdoc
+     * Query additional metadata for "magic" Entity properties like `script` and `serverScripts`.
+     *
+     * @function Entities.queryPropertyMetadata
+     * @param {EntityID} entityID The ID of the entity.
+     * @param {string} property The name of the property extended metadata is wanted for.
+     * @param {ResultCallback} callback Executes callback(err, result) with the query results.
+     */
+    /**jsdoc
+     * Query additional metadata for "magic" Entity properties like `script` and `serverScripts`.
+     *
+     * @function Entities.queryPropertyMetadata
+     * @param {EntityID} entityID The ID of the entity.
+     * @param {string} property The name of the property extended metadata is wanted for.
+     * @param {Object} thisObject The scoping "this" context that callback will be executed within.
+     * @param {ResultCallback} callbackOrMethodName Executes thisObject[callbackOrMethodName](err, result) with the query results.
+     */
+    Q_INVOKABLE bool queryPropertyMetadata(QUuid entityID, QScriptValue property, QScriptValue scopeOrCallback, QScriptValue methodOrName = QScriptValue());
+
     Q_INVOKABLE bool getServerScriptStatus(QUuid entityID, QScriptValue callback);
 
     Q_INVOKABLE void setLightsArePickable(bool value);
@@ -229,6 +266,7 @@ public slots:
     Q_INVOKABLE bool setAllVoxels(QUuid entityID, int value);
     Q_INVOKABLE bool setVoxelsInCuboid(QUuid entityID, const glm::vec3& lowPosition,
                                        const glm::vec3& cuboidSize, int value);
+    Q_INVOKABLE void voxelsToMesh(QUuid entityID, QScriptValue callback);
 
     Q_INVOKABLE bool setAllPoints(QUuid entityID, const QVector<glm::vec3>& points);
     Q_INVOKABLE bool appendPoint(QUuid entityID, const glm::vec3& point);
@@ -323,9 +361,14 @@ signals:
 
     void webEventReceived(const EntityItemID& entityItemID, const QVariant& message);
 
+protected:
+    void withEntitiesScriptEngine(std::function<void(EntitiesScriptEngineProvider*)> function) {
+        std::lock_guard<std::recursive_mutex> lock(_entitiesScriptEngineLock);
+        function(_entitiesScriptEngine);
+    };
 private:
     bool actionWorker(const QUuid& entityID, std::function<bool(EntitySimulationPointer, EntityItemPointer)> actor);
-    bool setVoxels(QUuid entityID, std::function<bool(PolyVoxEntityItem&)> actor);
+    bool polyVoxWorker(QUuid entityID, std::function<bool(PolyVoxEntityItem&)> actor);
     bool setPoints(QUuid entityID, std::function<bool(LineEntityItem&)> actor);
     void queueEntityMessage(PacketType packetType, EntityItemID entityID, const EntityItemProperties& properties);
 
diff --git a/libraries/entities/src/PolyVoxEntityItem.cpp b/libraries/entities/src/PolyVoxEntityItem.cpp
index 2a374c1d17..a827a9903d 100644
--- a/libraries/entities/src/PolyVoxEntityItem.cpp
+++ b/libraries/entities/src/PolyVoxEntityItem.cpp
@@ -242,3 +242,7 @@ const QByteArray PolyVoxEntityItem::getVoxelData() const {
     });
     return voxelDataCopy;
 }
+
+bool PolyVoxEntityItem::getMeshAsScriptValue(QScriptEngine *engine, QScriptValue& result) const {
+    return false;
+}
diff --git a/libraries/entities/src/PolyVoxEntityItem.h b/libraries/entities/src/PolyVoxEntityItem.h
index 910d8eff88..ae722b2add 100644
--- a/libraries/entities/src/PolyVoxEntityItem.h
+++ b/libraries/entities/src/PolyVoxEntityItem.h
@@ -131,7 +131,9 @@ class PolyVoxEntityItem : public EntityItem {
     virtual void rebakeMesh() {};
 
     void setVoxelDataDirty(bool value) { withWriteLock([&] { _voxelDataDirty = value; }); }
-    virtual void getMesh() {}; // recompute mesh
+    virtual void recomputeMesh() {};
+
+    virtual bool getMeshAsScriptValue(QScriptEngine *engine, QScriptValue& result) const;
 
  protected:
     glm::vec3 _voxelVolumeSize; // this is always 3 bytes
diff --git a/libraries/fbx/src/FBXReader_Node.cpp b/libraries/fbx/src/FBXReader_Node.cpp
index d814f58dab..d987f885eb 100644
--- a/libraries/fbx/src/FBXReader_Node.cpp
+++ b/libraries/fbx/src/FBXReader_Node.cpp
@@ -54,7 +54,8 @@ template<class T> QVariant readBinaryArray(QDataStream& in, int& position) {
             in.readRawData(compressed.data() + sizeof(quint32), compressedLength);
             position += compressedLength;
             arrayData = qUncompress(compressed);
-            if (arrayData.isEmpty() || arrayData.size() != (sizeof(T) * arrayLength)) { // answers empty byte array if corrupt
+            if (arrayData.isEmpty() ||
+                (unsigned int)arrayData.size() != (sizeof(T) * arrayLength)) { // answers empty byte array if corrupt
                 throw QString("corrupt fbx file");
             }
         } else {
diff --git a/libraries/fbx/src/OBJWriter.cpp b/libraries/fbx/src/OBJWriter.cpp
new file mode 100644
index 0000000000..5ee04c5718
--- /dev/null
+++ b/libraries/fbx/src/OBJWriter.cpp
@@ -0,0 +1,148 @@
+//
+//  OBJWriter.cpp
+//  libraries/fbx/src/
+//
+//  Created by Seth Alves on 2017-1-27.
+//  Copyright 2017 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#include <QFile>
+#include <QFileInfo>
+#include "model/Geometry.h"
+#include "OBJWriter.h"
+#include "ModelFormatLogging.h"
+
+static QString formatFloat(double n) {
+    // limit precision to 6, but don't output trailing zeros.
+    QString s = QString::number(n, 'f', 6);
+    while (s.endsWith("0")) {
+        s.remove(s.size() - 1, 1);
+    }
+    if (s.endsWith(".")) {
+        s.remove(s.size() - 1, 1);
+    }
+
+    // check for non-numbers.  if we get NaN or inf or scientific notation, just return 0
+    for (int i = 0; i < s.length(); i++) {
+        auto c = s.at(i).toLatin1();
+        if (c != '-' &&
+            c != '.' &&
+            (c < '0' || c > '9')) {
+            qCDebug(modelformat) << "OBJWriter zeroing bad vertex coordinate:" << s << "because of" << c;
+            return QString("0");
+        }
+    }
+
+    return s;
+}
+
+bool writeOBJToTextStream(QTextStream& out, QList<MeshPointer> meshes) {
+    // each mesh's vertices are numbered from zero.  We're combining all their vertices into one list here,
+    // so keep track of the start index for each mesh.
+    QList<int> meshVertexStartOffset;
+    int currentVertexStartOffset = 0;
+
+    // write out all vertices
+    foreach (const MeshPointer& mesh, meshes) {
+        meshVertexStartOffset.append(currentVertexStartOffset);
+        const gpu::BufferView& vertexBuffer = mesh->getVertexBuffer();
+        int vertexCount = 0;
+        gpu::BufferView::Iterator<const glm::vec3> vertexItr = vertexBuffer.cbegin<const glm::vec3>();
+        while (vertexItr != vertexBuffer.cend<const glm::vec3>()) {
+            glm::vec3 v = *vertexItr;
+            out << "v ";
+            out << formatFloat(v[0]) << " ";
+            out << formatFloat(v[1]) << " ";
+            out << formatFloat(v[2]) << "\n";
+            vertexItr++;
+            vertexCount++;
+        }
+        currentVertexStartOffset += vertexCount;
+    }
+    out << "\n";
+
+    // write out faces
+    int nth = 0;
+    foreach (const MeshPointer& mesh, meshes) {
+        currentVertexStartOffset = meshVertexStartOffset.takeFirst();
+
+        const gpu::BufferView& partBuffer = mesh->getPartBuffer();
+        const gpu::BufferView& indexBuffer = mesh->getIndexBuffer();
+
+        model::Index partCount = (model::Index)mesh->getNumParts();
+        for (int partIndex = 0; partIndex < partCount; partIndex++) {
+            const model::Mesh::Part& part = partBuffer.get<model::Mesh::Part>(partIndex);
+
+            out << "g part-" << nth++ << "\n";
+
+            // model::Mesh::TRIANGLES
+            // TODO -- handle other formats
+            gpu::BufferView::Iterator<const uint32_t> indexItr = indexBuffer.cbegin<uint32_t>();
+            indexItr += part._startIndex;
+
+            int indexCount = 0;
+            while (indexItr != indexBuffer.cend<uint32_t>() && indexCount < part._numIndices) {
+                uint32_t index0 = *indexItr;
+                indexItr++;
+                indexCount++;
+                if (indexItr == indexBuffer.cend<uint32_t>() || indexCount >= part._numIndices) {
+                    qCDebug(modelformat) << "OBJWriter -- index buffer length isn't multiple of 3";
+                    break;
+                }
+                uint32_t index1 = *indexItr;
+                indexItr++;
+                indexCount++;
+                if (indexItr == indexBuffer.cend<uint32_t>() || indexCount >= part._numIndices) {
+                    qCDebug(modelformat) << "OBJWriter -- index buffer length isn't multiple of 3";
+                    break;
+                }
+                uint32_t index2 = *indexItr;
+                indexItr++;
+                indexCount++;
+
+                out << "f ";
+                out << currentVertexStartOffset + index0 + 1 << " ";
+                out << currentVertexStartOffset + index1 + 1 << " ";
+                out << currentVertexStartOffset + index2 + 1 << "\n";
+            }
+            out << "\n";
+        }
+    }
+
+    return true;
+}
+
+bool writeOBJToFile(QString path, QList<MeshPointer> meshes) {
+    if (QFileInfo(path).exists() && !QFile::remove(path)) {
+        qCDebug(modelformat) << "OBJ writer failed, file exists:" << path;
+        return false;
+    }
+
+    QFile file(path);
+    if (!file.open(QIODevice::WriteOnly)) {
+        qCDebug(modelformat) << "OBJ writer failed to open output file:" << path;
+        return false;
+    }
+
+    QTextStream outStream(&file);
+
+    bool success;
+    success = writeOBJToTextStream(outStream, meshes);
+
+    file.close();
+    return success;
+}
+
+QString writeOBJToString(QList<MeshPointer> meshes) {
+    QString result;
+    QTextStream outStream(&result, QIODevice::ReadWrite);
+    bool success;
+    success = writeOBJToTextStream(outStream, meshes);
+    if (success) {
+        return result;
+    }
+    return QString("");
+}
diff --git a/libraries/fbx/src/OBJWriter.h b/libraries/fbx/src/OBJWriter.h
new file mode 100644
index 0000000000..b6e20e1ae6
--- /dev/null
+++ b/libraries/fbx/src/OBJWriter.h
@@ -0,0 +1,26 @@
+//
+//  OBJWriter.h
+//  libraries/fbx/src/
+//
+//  Created by Seth Alves on 2017-1-27.
+//  Copyright 2017 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#ifndef hifi_objwriter_h
+#define hifi_objwriter_h
+
+
+#include <QString>
+#include <QList>
+#include <model/Geometry.h>
+
+using MeshPointer = std::shared_ptr<model::Mesh>;
+
+bool writeOBJToTextStream(QTextStream& out, QList<MeshPointer> meshes);
+bool writeOBJToFile(QString path, QList<MeshPointer> meshes);
+QString writeOBJToString(QList<MeshPointer> meshes);
+
+#endif // hifi_objwriter_h
diff --git a/libraries/render-utils/src/LightingModel.cpp b/libraries/render-utils/src/LightingModel.cpp
index 47af83da36..bd321bad95 100644
--- a/libraries/render-utils/src/LightingModel.cpp
+++ b/libraries/render-utils/src/LightingModel.cpp
@@ -133,6 +133,7 @@ void LightingModel::setSpotLight(bool enable) {
 bool LightingModel::isSpotLightEnabled() const {
     return (bool)_parametersBuffer.get<Parameters>().enableSpotLight;
 }
+
 void LightingModel::setShowLightContour(bool enable) {
     if (enable != isShowLightContourEnabled()) {
         _parametersBuffer.edit<Parameters>().showLightContour = (float)enable;
@@ -142,6 +143,14 @@ bool LightingModel::isShowLightContourEnabled() const {
     return (bool)_parametersBuffer.get<Parameters>().showLightContour;
 }
 
+void LightingModel::setWireframe(bool enable) {
+    if (enable != isWireframeEnabled()) {
+        _parametersBuffer.edit<Parameters>().enableWireframe = (float)enable;
+    }
+}
+bool LightingModel::isWireframeEnabled() const {
+    return (bool)_parametersBuffer.get<Parameters>().enableWireframe;
+}
 MakeLightingModel::MakeLightingModel() {
     _lightingModel = std::make_shared<LightingModel>();
 }
@@ -167,6 +176,7 @@ void MakeLightingModel::configure(const Config& config) {
     _lightingModel->setSpotLight(config.enableSpotLight);
 
     _lightingModel->setShowLightContour(config.showLightContour);
+    _lightingModel->setWireframe(config.enableWireframe);
 }
 
 void MakeLightingModel::run(const render::SceneContextPointer& sceneContext, const render::RenderContextPointer& renderContext, LightingModelPointer& lightingModel) {
diff --git a/libraries/render-utils/src/LightingModel.h b/libraries/render-utils/src/LightingModel.h
index 45514654f2..c1189d5160 100644
--- a/libraries/render-utils/src/LightingModel.h
+++ b/libraries/render-utils/src/LightingModel.h
@@ -64,6 +64,9 @@ public:
     void setShowLightContour(bool enable);
     bool isShowLightContourEnabled() const;
 
+    void setWireframe(bool enable);
+    bool isWireframeEnabled() const;
+
     UniformBufferView getParametersBuffer() const { return _parametersBuffer; }
 
 protected:
@@ -89,13 +92,12 @@ protected:
         float enablePointLight{ 1.0f };
         float enableSpotLight{ 1.0f };
 
-        float showLightContour{ 0.0f }; // false by default
+        float showLightContour { 0.0f }; // false by default
 
         float enableObscurance{ 1.0f };
 
         float enableMaterialTexturing { 1.0f };
-
-        float spares{ 0.0f };
+        float enableWireframe { 0.0f }; // false by default
 
         Parameters() {}
     };
@@ -129,6 +131,7 @@ class MakeLightingModelConfig : public render::Job::Config {
     Q_PROPERTY(bool enablePointLight MEMBER enablePointLight NOTIFY dirty)
     Q_PROPERTY(bool enableSpotLight MEMBER enableSpotLight NOTIFY dirty)
 
+    Q_PROPERTY(bool enableWireframe MEMBER enableWireframe NOTIFY dirty)
     Q_PROPERTY(bool showLightContour MEMBER showLightContour NOTIFY dirty)
 
 public:
@@ -152,9 +155,10 @@ public:
     bool enablePointLight{ true };
     bool enableSpotLight{ true };
 
-
     bool showLightContour { false }; // false by default
 
+    bool enableWireframe { false }; // false by default
+
 signals:
     void dirty();
 };
diff --git a/libraries/render-utils/src/LightingModel.slh b/libraries/render-utils/src/LightingModel.slh
index 74285aa6a9..209a1f38d6 100644
--- a/libraries/render-utils/src/LightingModel.slh
+++ b/libraries/render-utils/src/LightingModel.slh
@@ -17,7 +17,7 @@ struct LightingModel {
     vec4 _UnlitEmissiveLightmapBackground;
     vec4 _ScatteringDiffuseSpecularAlbedo;
     vec4 _AmbientDirectionalPointSpot;
-    vec4 _ShowContourObscuranceSpare2;
+    vec4 _ShowContourObscuranceWireframe;
 };
 
 uniform lightingModelBuffer{
@@ -37,7 +37,7 @@ float isBackgroundEnabled() {
     return lightingModel._UnlitEmissiveLightmapBackground.w;
 }
 float isObscuranceEnabled() {
-    return lightingModel._ShowContourObscuranceSpare2.y;
+    return lightingModel._ShowContourObscuranceWireframe.y;
 }
 
 float isScatteringEnabled() {
@@ -67,9 +67,12 @@ float isSpotEnabled() {
 }
 
 float isShowLightContour() {
-    return lightingModel._ShowContourObscuranceSpare2.x;
+    return lightingModel._ShowContourObscuranceWireframe.x;
 }
 
+float isWireframeEnabled() {
+    return lightingModel._ShowContourObscuranceWireframe.z;
+}
 
 <@endfunc@>
 <$declareLightingModel()$>
diff --git a/libraries/render-utils/src/RenderDeferredTask.cpp b/libraries/render-utils/src/RenderDeferredTask.cpp
index 676d176cca..85a782968f 100644
--- a/libraries/render-utils/src/RenderDeferredTask.cpp
+++ b/libraries/render-utils/src/RenderDeferredTask.cpp
@@ -259,8 +259,18 @@ void DrawDeferred::run(const SceneContextPointer& sceneContext, const RenderCont
         // Setup lighting model for all items;
         batch.setUniformBuffer(render::ShapePipeline::Slot::LIGHTING_MODEL, lightingModel->getParametersBuffer());
 
-        renderShapes(sceneContext, renderContext, _shapePlumber, inItems, _maxDrawn);
+        // From the lighting model define a global shapKey ORED with individiual keys
+        ShapeKey::Builder keyBuilder;
+        if (lightingModel->isWireframeEnabled()) {
+            keyBuilder.withWireframe();
+        }
+        ShapeKey globalKey = keyBuilder.build();
+        args->_globalShapeKey = globalKey._flags.to_ulong();
+
+        renderShapes(sceneContext, renderContext, _shapePlumber, inItems, _maxDrawn, globalKey);
+
         args->_batch = nullptr;
+        args->_globalShapeKey = 0;
     });
 
     config->setNumDrawn((int)inItems.size());
@@ -295,12 +305,21 @@ void DrawStateSortDeferred::run(const SceneContextPointer& sceneContext, const R
         // Setup lighting model for all items;
         batch.setUniformBuffer(render::ShapePipeline::Slot::LIGHTING_MODEL, lightingModel->getParametersBuffer());
 
+        // From the lighting model define a global shapKey ORED with individiual keys
+        ShapeKey::Builder keyBuilder;
+        if (lightingModel->isWireframeEnabled()) {
+            keyBuilder.withWireframe();
+        }
+        ShapeKey globalKey = keyBuilder.build();
+        args->_globalShapeKey = globalKey._flags.to_ulong();
+
         if (_stateSort) {
-            renderStateSortShapes(sceneContext, renderContext, _shapePlumber, inItems, _maxDrawn);
+            renderStateSortShapes(sceneContext, renderContext, _shapePlumber, inItems, _maxDrawn, globalKey);
         } else {
-            renderShapes(sceneContext, renderContext, _shapePlumber, inItems, _maxDrawn);
+            renderShapes(sceneContext, renderContext, _shapePlumber, inItems, _maxDrawn, globalKey);
         }
         args->_batch = nullptr;
+        args->_globalShapeKey = 0;
     });
 
     config->setNumDrawn((int)inItems.size());
diff --git a/libraries/render-utils/src/RenderPipelines.cpp b/libraries/render-utils/src/RenderPipelines.cpp
index 4fbac4170e..414bcf0d63 100644
--- a/libraries/render-utils/src/RenderPipelines.cpp
+++ b/libraries/render-utils/src/RenderPipelines.cpp
@@ -307,7 +307,7 @@ void initForwardPipelines(render::ShapePlumber& plumber) {
 void addPlumberPipeline(ShapePlumber& plumber,
         const ShapeKey& key, const gpu::ShaderPointer& vertex, const gpu::ShaderPointer& pixel) {
     // These key-values' pipelines are added by this functor in addition to the key passed
-    assert(!key.isWireFrame());
+    assert(!key.isWireframe());
     assert(!key.isDepthBiased());
     assert(key.isCullFace());
 
diff --git a/libraries/render/src/render/DrawTask.cpp b/libraries/render/src/render/DrawTask.cpp
index 2829c6f8e7..e8537e3452 100755
--- a/libraries/render/src/render/DrawTask.cpp
+++ b/libraries/render/src/render/DrawTask.cpp
@@ -39,9 +39,9 @@ void render::renderItems(const SceneContextPointer& sceneContext, const RenderCo
     }
 }
 
-void renderShape(RenderArgs* args, const ShapePlumberPointer& shapeContext, const Item& item) {
+void renderShape(RenderArgs* args, const ShapePlumberPointer& shapeContext, const Item& item, const ShapeKey& globalKey) {
     assert(item.getKey().isShape());
-    const auto& key = item.getShapeKey();
+    auto key = item.getShapeKey() | globalKey;
     if (key.isValid() && !key.hasOwnPipeline()) {
         args->_pipeline = shapeContext->pickPipeline(args, key);
         if (args->_pipeline) {
@@ -56,7 +56,7 @@ void renderShape(RenderArgs* args, const ShapePlumberPointer& shapeContext, cons
 }
 
 void render::renderShapes(const SceneContextPointer& sceneContext, const RenderContextPointer& renderContext,
-                          const ShapePlumberPointer& shapeContext, const ItemBounds& inItems, int maxDrawnItems) {
+    const ShapePlumberPointer& shapeContext, const ItemBounds& inItems, int maxDrawnItems, const ShapeKey& globalKey) {
     auto& scene = sceneContext->_scene;
     RenderArgs* args = renderContext->args;
     
@@ -66,12 +66,12 @@ void render::renderShapes(const SceneContextPointer& sceneContext, const RenderC
     }
     for (auto i = 0; i < numItemsToDraw; ++i) {
         auto& item = scene->getItem(inItems[i].id);
-        renderShape(args, shapeContext, item);
+        renderShape(args, shapeContext, item, globalKey);
     }
 }
 
 void render::renderStateSortShapes(const SceneContextPointer& sceneContext, const RenderContextPointer& renderContext,
-    const ShapePlumberPointer& shapeContext, const ItemBounds& inItems, int maxDrawnItems) {
+    const ShapePlumberPointer& shapeContext, const ItemBounds& inItems, int maxDrawnItems, const ShapeKey& globalKey) {
     auto& scene = sceneContext->_scene;
     RenderArgs* args = renderContext->args;
 
@@ -91,7 +91,7 @@ void render::renderStateSortShapes(const SceneContextPointer& sceneContext, cons
 
         {
             assert(item.getKey().isShape());
-            const auto key = item.getShapeKey();
+            auto key = item.getShapeKey() | globalKey;
             if (key.isValid() && !key.hasOwnPipeline()) {
                 auto& bucket = sortedShapes[key];
                 if (bucket.empty()) {
diff --git a/libraries/render/src/render/DrawTask.h b/libraries/render/src/render/DrawTask.h
index 6e0e5ba10b..a9c5f3a4d8 100755
--- a/libraries/render/src/render/DrawTask.h
+++ b/libraries/render/src/render/DrawTask.h
@@ -17,8 +17,8 @@
 namespace render {
 
 void renderItems(const SceneContextPointer& sceneContext, const RenderContextPointer& renderContext, const ItemBounds& inItems, int maxDrawnItems = -1);
-void renderShapes(const SceneContextPointer& sceneContext, const RenderContextPointer& renderContext, const ShapePlumberPointer& shapeContext, const ItemBounds& inItems, int maxDrawnItems = -1);
-void renderStateSortShapes(const SceneContextPointer& sceneContext, const RenderContextPointer& renderContext, const ShapePlumberPointer& shapeContext, const ItemBounds& inItems, int maxDrawnItems = -1);
+void renderShapes(const SceneContextPointer& sceneContext, const RenderContextPointer& renderContext, const ShapePlumberPointer& shapeContext, const ItemBounds& inItems, int maxDrawnItems = -1, const ShapeKey& globalKey = ShapeKey());
+void renderStateSortShapes(const SceneContextPointer& sceneContext, const RenderContextPointer& renderContext, const ShapePlumberPointer& shapeContext, const ItemBounds& inItems, int maxDrawnItems = -1, const ShapeKey& globalKey = ShapeKey());
 
 class DrawLightConfig : public Job::Config {
     Q_OBJECT
diff --git a/libraries/render/src/render/ShapePipeline.h b/libraries/render/src/render/ShapePipeline.h
index 0c77a15184..73e8f82f24 100644
--- a/libraries/render/src/render/ShapePipeline.h
+++ b/libraries/render/src/render/ShapePipeline.h
@@ -46,6 +46,10 @@ public:
     ShapeKey() : _flags{ 0 } {}
     ShapeKey(const Flags& flags) : _flags{flags} {}
 
+    friend ShapeKey operator&(const ShapeKey& _Left, const ShapeKey& _Right) { return ShapeKey(_Left._flags & _Right._flags); }
+    friend ShapeKey operator|(const ShapeKey& _Left, const ShapeKey& _Right) { return ShapeKey(_Left._flags | _Right._flags); }
+    friend ShapeKey operator^(const ShapeKey& _Left, const ShapeKey& _Right) { return ShapeKey(_Left._flags ^ _Right._flags); }
+
     class Builder {
     public:
         Builder() {}
@@ -144,7 +148,7 @@ public:
     bool isSkinned() const { return _flags[SKINNED]; }
     bool isDepthOnly() const { return _flags[DEPTH_ONLY]; }
     bool isDepthBiased() const { return _flags[DEPTH_BIAS]; }
-    bool isWireFrame() const { return _flags[WIREFRAME]; }
+    bool isWireframe() const { return _flags[WIREFRAME]; }
     bool isCullFace() const { return !_flags[NO_CULL_FACE]; }
 
     bool hasOwnPipeline() const { return _flags[OWN_PIPELINE]; }
@@ -180,7 +184,7 @@ inline QDebug operator<<(QDebug debug, const ShapeKey& key) {
                 << "isSkinned:" << key.isSkinned()
                 << "isDepthOnly:" << key.isDepthOnly()
                 << "isDepthBiased:" << key.isDepthBiased()
-                << "isWireFrame:" << key.isWireFrame()
+                << "isWireframe:" << key.isWireframe()
                 << "isCullFace:" << key.isCullFace()
                 << "]";
         }
diff --git a/libraries/script-engine/src/BaseScriptEngine.h b/libraries/script-engine/src/BaseScriptEngine.h
deleted file mode 100644
index 27a6eff33d..0000000000
--- a/libraries/script-engine/src/BaseScriptEngine.h
+++ /dev/null
@@ -1,67 +0,0 @@
-//
-//  BaseScriptEngine.h
-//  libraries/script-engine/src
-//
-//  Created by Timothy Dedischew on 02/01/17.
-//  Copyright 2017 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-#ifndef hifi_BaseScriptEngine_h
-#define hifi_BaseScriptEngine_h
-
-#include <functional>
-#include <QtCore/QDebug>
-#include <QtScript/QScriptEngine>
-
-#include "SettingHandle.h"
-
-// common base class for extending QScriptEngine itself
-class BaseScriptEngine : public QScriptEngine {
-    Q_OBJECT
-public:
-    static const QString SCRIPT_EXCEPTION_FORMAT;
-    static const QString SCRIPT_BACKTRACE_SEP;
-
-    BaseScriptEngine() {}
-
-    Q_INVOKABLE QScriptValue evaluateInClosure(const QScriptValue& locals, const QScriptProgram& program);
-
-    Q_INVOKABLE QScriptValue lintScript(const QString& sourceCode, const QString& fileName, const int lineNumber = 1);
-    Q_INVOKABLE QScriptValue makeError(const QScriptValue& other = QScriptValue(), const QString& type = "Error");
-    Q_INVOKABLE QString formatException(const QScriptValue& exception);
-    QScriptValue cloneUncaughtException(const QString& detail = QString());
-
-signals:
-    void unhandledException(const QScriptValue& exception);
-
-protected:
-    void _emitUnhandledException(const QScriptValue& exception);
-    QScriptValue newLambdaFunction(std::function<QScriptValue(QScriptContext *context, QScriptEngine* engine)> operation, const QScriptValue& data = QScriptValue(), const QScriptEngine::ValueOwnership& ownership = QScriptEngine::AutoOwnership);
-
-    static const QString _SETTINGS_ENABLE_EXTENDED_EXCEPTIONS;
-    Setting::Handle<bool> _enableExtendedJSExceptions { _SETTINGS_ENABLE_EXTENDED_EXCEPTIONS, true };
-#ifdef DEBUG_JS
-    static void _debugDump(const QString& header, const QScriptValue& object, const QString& footer = QString());
-#endif
-};
-
-// Lambda helps create callable QScriptValues out of std::functions:
-// (just meant for use from within the script engine itself)
-class Lambda : public QObject {
-    Q_OBJECT
-public:
-    Lambda(QScriptEngine *engine, std::function<QScriptValue(QScriptContext *context, QScriptEngine* engine)> operation, QScriptValue data);
-    ~Lambda();
-    public slots:
-        QScriptValue call();
-    QString toString() const;
-private:
-    QScriptEngine* engine;
-    std::function<QScriptValue(QScriptContext *context, QScriptEngine* engine)> operation;
-    QScriptValue data;
-};
-
-#endif // hifi_BaseScriptEngine_h
diff --git a/libraries/script-engine/src/MeshProxy.h b/libraries/script-engine/src/MeshProxy.h
new file mode 100644
index 0000000000..82f5038348
--- /dev/null
+++ b/libraries/script-engine/src/MeshProxy.h
@@ -0,0 +1,41 @@
+//
+//  MeshProxy.h
+//  libraries/script-engine/src
+//
+//  Created by Seth Alves on 2017-1-27.
+//  Copyright 2017 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#ifndef hifi_MeshProxy_h
+#define hifi_MeshProxy_h
+
+#include <model/Geometry.h>
+
+using MeshPointer = std::shared_ptr<model::Mesh>;
+
+class MeshProxy : public QObject {
+    Q_OBJECT
+
+public:
+    MeshProxy(MeshPointer mesh) : _mesh(mesh) {}
+    ~MeshProxy() {}
+
+    MeshPointer getMeshPointer() const { return _mesh; }
+
+    Q_INVOKABLE int getNumVertices() const { return (int)_mesh->getNumVertices(); }
+    Q_INVOKABLE glm::vec3 getPos3(int index) const { return _mesh->getPos3(index); }
+
+
+protected:
+    MeshPointer _mesh;
+};
+
+Q_DECLARE_METATYPE(MeshProxy*);
+
+class MeshProxyList : public QList<MeshProxy*> {}; // typedef and using fight with the Qt macros/templates, do this instead
+Q_DECLARE_METATYPE(MeshProxyList);
+
+#endif // hifi_MeshProxy_h
diff --git a/libraries/script-engine/src/ModelScriptingInterface.cpp b/libraries/script-engine/src/ModelScriptingInterface.cpp
new file mode 100644
index 0000000000..4ba82edf7d
--- /dev/null
+++ b/libraries/script-engine/src/ModelScriptingInterface.cpp
@@ -0,0 +1,53 @@
+//
+//  ModelScriptingInterface.cpp
+//  libraries/script-engine/src
+//
+//  Created by Seth Alves on 2017-1-27.
+//  Copyright 2017 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#include <QScriptEngine>
+#include <QScriptValueIterator>
+#include <QtScript/QScriptValue>
+#include "ModelScriptingInterface.h"
+#include "OBJWriter.h"
+
+
+ModelScriptingInterface::ModelScriptingInterface(QObject* parent) : QObject(parent) {
+}
+
+QScriptValue meshToScriptValue(QScriptEngine* engine, MeshProxy* const &in) {
+    return engine->newQObject(in, QScriptEngine::QtOwnership,
+                              QScriptEngine::ExcludeDeleteLater | QScriptEngine::ExcludeChildObjects);
+}
+
+void meshFromScriptValue(const QScriptValue& value, MeshProxy* &out) {
+    out = qobject_cast<MeshProxy*>(value.toQObject());
+}
+
+QScriptValue meshesToScriptValue(QScriptEngine* engine, const MeshProxyList &in) {
+    return engine->toScriptValue(in);
+}
+
+void meshesFromScriptValue(const QScriptValue& value, MeshProxyList &out) {
+    QScriptValueIterator itr(value);
+    while(itr.hasNext()) {
+        itr.next();
+        MeshProxy* meshProxy = qscriptvalue_cast<MeshProxyList::value_type>(itr.value());
+        if (meshProxy) {
+            out.append(meshProxy);
+        }
+    }
+}
+
+QString ModelScriptingInterface::meshToOBJ(MeshProxyList in) {
+    QList<MeshPointer> meshes;
+    foreach (const MeshProxy* meshProxy, in) {
+        meshes.append(meshProxy->getMeshPointer());
+    }
+
+    return writeOBJToString(meshes);
+}
diff --git a/libraries/script-engine/src/ModelScriptingInterface.h b/libraries/script-engine/src/ModelScriptingInterface.h
new file mode 100644
index 0000000000..94b7338ae2
--- /dev/null
+++ b/libraries/script-engine/src/ModelScriptingInterface.h
@@ -0,0 +1,39 @@
+//
+//  ModelScriptingInterface.h
+//  libraries/script-engine/src
+//
+//  Created by Seth Alves on 2017-1-27.
+//  Copyright 2017 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+
+#ifndef hifi_ModelScriptingInterface_h
+#define hifi_ModelScriptingInterface_h
+
+#include <QtCore/QObject>
+#include <QScriptValue>
+#include <OBJWriter.h>
+#include <model/Geometry.h>
+#include "MeshProxy.h"
+
+using MeshPointer = std::shared_ptr<model::Mesh>;
+
+class ModelScriptingInterface : public QObject {
+    Q_OBJECT
+
+public:
+    ModelScriptingInterface(QObject* parent);
+
+    Q_INVOKABLE QString meshToOBJ(MeshProxyList in);
+};
+
+QScriptValue meshToScriptValue(QScriptEngine* engine, MeshProxy* const &in);
+void meshFromScriptValue(const QScriptValue& value, MeshProxy* &out);
+
+QScriptValue meshesToScriptValue(QScriptEngine* engine, const MeshProxyList &in);
+void meshesFromScriptValue(const QScriptValue& value, MeshProxyList &out);
+
+#endif // hifi_ModelScriptingInterface_h
diff --git a/libraries/script-engine/src/ScriptEngine.cpp b/libraries/script-engine/src/ScriptEngine.cpp
index 56b147e9b7..3e4e070717 100644
--- a/libraries/script-engine/src/ScriptEngine.cpp
+++ b/libraries/script-engine/src/ScriptEngine.cpp
@@ -19,6 +19,9 @@
 #include <QtCore/QThread>
 #include <QtCore/QRegularExpression>
 
+#include <QtCore/QFuture>
+#include <QtConcurrent/QtConcurrentRun>
+
 #include <QtWidgets/QMainWindow>
 #include <QtWidgets/QApplication>
 
@@ -65,18 +68,25 @@
 #include "RecordingScriptingInterface.h"
 #include "ScriptEngines.h"
 #include "TabletScriptingInterface.h"
+#include "ModelScriptingInterface.h"
+
 
 #include <Profile.h>
 
 #include "MIDIEvent.h"
 
+const QString ScriptEngine::_SETTINGS_ENABLE_EXTENDED_EXCEPTIONS {
+    "com.highfidelity.experimental.enableExtendedJSExceptions"
+};
+
+static const int MAX_MODULE_ID_LENGTH { 4096 };
+static const int MAX_DEBUG_VALUE_LENGTH { 80 };
+
 static const QScriptEngine::QObjectWrapOptions DEFAULT_QOBJECT_WRAP_OPTIONS =
                 QScriptEngine::ExcludeDeleteLater | QScriptEngine::ExcludeChildObjects;
 static const QScriptValue::PropertyFlags READONLY_PROP_FLAGS { QScriptValue::ReadOnly | QScriptValue::Undeletable };
 static const QScriptValue::PropertyFlags READONLY_HIDDEN_PROP_FLAGS { READONLY_PROP_FLAGS | QScriptValue::SkipInEnumeration };
 
-
-
 static const bool HIFI_AUTOREFRESH_FILE_SCRIPTS { true };
 
 Q_DECLARE_METATYPE(QScriptEngine::FunctionSignature)
@@ -84,7 +94,7 @@ int functionSignatureMetaID = qRegisterMetaType<QScriptEngine::FunctionSignature
 
 Q_LOGGING_CATEGORY(scriptengineScript, "hifi.scriptengine.script")
 
-static QScriptValue debugPrint(QScriptContext* context, QScriptEngine* engine){
+static QScriptValue debugPrint(QScriptContext* context, QScriptEngine* engine) {
     QString message = "";
     for (int i = 0; i < context->argumentCount(); i++) {
         if (i > 0) {
@@ -141,7 +151,7 @@ QString encodeEntityIdIntoEntityUrl(const QString& url, const QString& entityID)
 }
 
 QString ScriptEngine::logException(const QScriptValue& exception) {
-    auto message = formatException(exception);
+    auto message = formatException(exception, _enableExtendedJSExceptions.get());
     scriptErrorMessage(message);
     return message;
 }
@@ -333,7 +343,7 @@ void ScriptEngine::runInThread() {
     // The thread interface cannot live on itself, and we want to move this into the thread, so
     // the thread cannot have this as a parent.
     QThread* workerThread = new QThread();
-    workerThread->setObjectName(QString("Script Thread:") + getFilename());
+    workerThread->setObjectName(QString("js:") + getFilename().replace("about:",""));
     moveToThread(workerThread);
     
     // NOTE: If you connect any essential signals for proper shutdown or cleanup of
@@ -532,6 +542,40 @@ static QScriptValue createScriptableResourcePrototype(QScriptEngine* engine) {
     return prototype;
 }
 
+void ScriptEngine::resetModuleCache(bool deleteScriptCache) {
+    if (QThread::currentThread() != thread()) {
+        executeOnScriptThread([=]() { resetModuleCache(deleteScriptCache); });
+        return;
+    }
+    auto jsRequire = globalObject().property("Script").property("require");
+    auto cache = jsRequire.property("cache");
+    auto cacheMeta = jsRequire.data();
+
+    if (deleteScriptCache) {
+        QScriptValueIterator it(cache);
+        while (it.hasNext()) {
+            it.next();
+            if (it.flags() & QScriptValue::SkipInEnumeration) {
+                continue;
+            }
+            qCDebug(scriptengine) << "resetModuleCache(true) -- staging " << it.name() << " for cache reset at next require";
+            cacheMeta.setProperty(it.name(), true);
+        }
+    }
+    cache = newObject();
+    if (!cacheMeta.isObject()) {
+        cacheMeta = newObject();
+        cacheMeta.setProperty("id", "Script.require.cacheMeta");
+        cacheMeta.setProperty("type", "cacheMeta");
+        jsRequire.setData(cacheMeta);
+    }
+    cache.setProperty("__created__", (double)QDateTime::currentMSecsSinceEpoch(), QScriptValue::SkipInEnumeration);
+#if DEBUG_JS_MODULES
+    cache.setProperty("__meta__", cacheMeta, READONLY_HIDDEN_PROP_FLAGS);
+#endif
+    jsRequire.setProperty("cache", cache, READONLY_PROP_FLAGS);
+}
+
 void ScriptEngine::init() {
     if (_isInitialized) {
         return; // only initialize once
@@ -585,6 +629,15 @@ void ScriptEngine::init() {
 
     registerGlobalObject("Script", this);
 
+    {
+        // set up Script.require.resolve and Script.require.cache
+        auto Script = globalObject().property("Script");
+        auto require = Script.property("require");
+        auto resolve = Script.property("_requireResolve");
+        require.setProperty("resolve", resolve, READONLY_PROP_FLAGS);
+        resetModuleCache();
+    }
+
     registerGlobalObject("Audio", &AudioScriptingInterface::getInstance());
     registerGlobalObject("Entities", entityScriptingInterface.data());
     registerGlobalObject("Quat", &_quatLibrary);
@@ -594,7 +647,7 @@ void ScriptEngine::init() {
     registerGlobalObject("Messages", DependencyManager::get<MessagesClient>().data());
 
     registerGlobalObject("File", new FileScriptingInterface(this));
-    
+
     qScriptRegisterMetaType(this, animVarMapToScriptValue, animVarMapFromScriptValue);
     qScriptRegisterMetaType(this, resultHandlerToScriptValue, resultHandlerFromScriptValue);
 
@@ -612,6 +665,10 @@ void ScriptEngine::init() {
     registerGlobalObject("Resources", DependencyManager::get<ResourceScriptingInterface>().data());
 
     registerGlobalObject("DebugDraw", &DebugDraw::getInstance());
+
+    registerGlobalObject("Model", new ModelScriptingInterface(this));
+    qScriptRegisterMetaType(this, meshToScriptValue, meshFromScriptValue);
+    qScriptRegisterMetaType(this, meshesToScriptValue, meshesFromScriptValue);
 }
 
 void ScriptEngine::registerValue(const QString& valueName, QScriptValue value) {
@@ -853,6 +910,11 @@ void ScriptEngine::addEventHandler(const EntityItemID& entityID, const QString&
     handlersForEvent << handlerData; // Note that the same handler can be added many times. See removeEntityEventHandler().
 }
 
+// this is not redundant -- the version in BaseScriptEngine is specifically not Q_INVOKABLE
+QScriptValue ScriptEngine::evaluateInClosure(const QScriptValue& closure, const QScriptProgram& program) {
+    return BaseScriptEngine::evaluateInClosure(closure, program);
+}
+
 QScriptValue ScriptEngine::evaluate(const QString& sourceCode, const QString& fileName, int lineNumber) {
     if (DependencyManager::get<ScriptEngines>()->isStopped()) {
         return QScriptValue(); // bail early
@@ -875,29 +937,26 @@ QScriptValue ScriptEngine::evaluate(const QString& sourceCode, const QString& fi
     // Check syntax
     auto syntaxError = lintScript(sourceCode, fileName);
     if (syntaxError.isError()) {
-        if (isEvaluating()) {
-            currentContext()->throwValue(syntaxError);
-        } else {
+        if (!isEvaluating()) {
             syntaxError.setProperty("detail", "evaluate");
-            emit unhandledException(syntaxError);
         }
+        raiseException(syntaxError);
+        maybeEmitUncaughtException("lint");
         return syntaxError;
     }
     QScriptProgram program { sourceCode, fileName, lineNumber };
     if (program.isNull()) {
         // can this happen?
         auto err = makeError("could not create QScriptProgram for " + fileName);
-        emit unhandledException(err);
+        raiseException(err);
+        maybeEmitUncaughtException("compile");
         return err;
     }
 
     QScriptValue result;
     {
         result = BaseScriptEngine::evaluate(program);
-        if (!isEvaluating() && hasUncaughtException()) {
-            emit unhandledException(cloneUncaughtException(__FUNCTION__));
-            clearExceptions();
-        }
+        maybeEmitUncaughtException("evaluate");
     }
     return result;
 }
@@ -920,10 +979,7 @@ void ScriptEngine::run() {
 
     {
         evaluate(_scriptContents, _fileNameString);
-        if (!isEvaluating() && hasUncaughtException()) {
-            emit unhandledException(cloneUncaughtException(__FUNCTION__));
-            clearExceptions();
-        }
+        maybeEmitUncaughtException(__FUNCTION__);
     }
 #ifdef _WIN32
     // VS13 does not sleep_until unless it uses the system_clock, see:
@@ -1294,11 +1350,361 @@ void ScriptEngine::print(const QString& message) {
     emit printedMessage(message);
 }
 
+// Script.require.resolve -- like resolvePath, but performs more validation and throws exceptions on invalid module identifiers (for consistency with Node.js)
+QString ScriptEngine::_requireResolve(const QString& moduleId, const QString& relativeTo) {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return QString();
+    }
+    QUrl defaultScriptsLoc = defaultScriptsLocation();
+    QUrl url(moduleId);
+
+    auto displayId = moduleId;
+    if (displayId.length() > MAX_DEBUG_VALUE_LENGTH) {
+        displayId = displayId.mid(0, MAX_DEBUG_VALUE_LENGTH) + "...";
+    }
+    auto message = QString("Cannot find module '%1' (%2)").arg(displayId);
+
+    auto throwResolveError = [&](const QScriptValue& error) -> QString {
+        raiseException(error);
+        maybeEmitUncaughtException("require.resolve");
+        return QString();
+    };
+
+    // de-fuzz the input a little by restricting to rational sizes
+    auto idLength = url.toString().length();
+    if (idLength < 1 || idLength > MAX_MODULE_ID_LENGTH) {
+        auto details = QString("rejecting invalid module id size (%1 chars [1,%2])")
+            .arg(idLength).arg(MAX_MODULE_ID_LENGTH);
+        return throwResolveError(makeError(message.arg(details), "RangeError"));
+    }
+
+    // this regex matches: absolute, dotted or path-like URLs
+    // (ie: the kind of stuff ScriptEngine::resolvePath already handles)
+    QRegularExpression qualified ("^\\w+:|^/|^[.]{1,2}(/|$)");
+
+    // this is for module.require (which is a bound version of require that's always relative to the module path)
+    if (!relativeTo.isEmpty()) {
+        url = QUrl(relativeTo).resolved(moduleId);
+        url = resolvePath(url.toString());
+    } else if (qualified.match(moduleId).hasMatch()) {
+        url = resolvePath(moduleId);
+    } else {
+        // check if the moduleId refers to a "system" module
+        QString systemPath = defaultScriptsLoc.path();
+        QString systemModulePath = QString("%1/modules/%2.js").arg(systemPath).arg(moduleId);
+        url = defaultScriptsLoc;
+        url.setPath(systemModulePath);
+        if (!QFileInfo(url.toLocalFile()).isFile()) {
+            if (!moduleId.contains("./")) {
+                // the user might be trying to refer to a relative file without anchoring it
+                // let's do them a favor and test for that case -- offering specific advice if detected
+                auto unanchoredUrl = resolvePath("./" + moduleId);
+                if (QFileInfo(unanchoredUrl.toLocalFile()).isFile()) {
+                    auto msg = QString("relative module ids must be anchored; use './%1' instead")
+                        .arg(moduleId);
+                    return throwResolveError(makeError(message.arg(msg)));
+                }
+            }
+            return throwResolveError(makeError(message.arg("system module not found")));
+        }
+    }
+
+    if (url.isRelative()) {
+        return throwResolveError(makeError(message.arg("could not resolve module id")));
+    }
+
+    // if it looks like a local file, verify that it's an allowed path and really a file
+    if (url.isLocalFile()) {
+        QFileInfo file(url.toLocalFile());
+        QUrl canonical = url;
+        if (file.exists()) {
+            canonical.setPath(file.canonicalFilePath());
+        }
+
+        bool disallowOutsideFiles = !defaultScriptsLocation().isParentOf(canonical) && !currentSandboxURL.isLocalFile();
+        if (disallowOutsideFiles && !PathUtils::isDescendantOf(canonical, currentSandboxURL)) {
+            return throwResolveError(makeError(message.arg(
+                QString("path '%1' outside of origin script '%2' '%3'")
+                    .arg(PathUtils::stripFilename(url))
+                    .arg(PathUtils::stripFilename(currentSandboxURL))
+                    .arg(canonical.toString())
+            )));
+        }
+        if (!file.exists()) {
+            return throwResolveError(makeError(message.arg("path does not exist: " + url.toLocalFile())));
+        }
+        if (!file.isFile()) {
+            return throwResolveError(makeError(message.arg("path is not a file: " + url.toLocalFile())));
+        }
+    }
+
+    maybeEmitUncaughtException(__FUNCTION__);
+    return url.toString();
+}
+
+// retrieves the current parent module from the JS scope chain
+QScriptValue ScriptEngine::currentModule() {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return unboundNullValue();
+    }
+    auto jsRequire = globalObject().property("Script").property("require");
+    auto cache = jsRequire.property("cache");
+    auto candidate = QScriptValue();
+    for (auto c = currentContext(); c && !candidate.isObject(); c = c->parentContext()) {
+        QScriptContextInfo contextInfo { c };
+        candidate = cache.property(contextInfo.fileName());
+    }
+    if (!candidate.isObject()) {
+        return QScriptValue();
+    }
+    return candidate;
+}
+
+// replaces or adds "module" to "parent.children[]" array
+// (for consistency with Node.js and userscript cache invalidation without "cache busters")
+bool ScriptEngine::registerModuleWithParent(const QScriptValue& module, const QScriptValue& parent) {
+    auto children = parent.property("children");
+    if (children.isArray()) {
+        auto key = module.property("id");
+        auto length = children.property("length").toInt32();
+        for (int i = 0; i < length; i++) {
+            if (children.property(i).property("id").strictlyEquals(key)) {
+                qCDebug(scriptengine_module) << key.toString() << " updating parent.children[" << i << "] = module";
+                children.setProperty(i, module);
+                return true;
+            }
+        }
+        qCDebug(scriptengine_module) << key.toString() << " appending parent.children[" << length << "] = module";
+        children.setProperty(length, module);
+        return true;
+    } else if (parent.isValid()) {
+        qCDebug(scriptengine_module) << "registerModuleWithParent -- unrecognized parent" << parent.toVariant().toString();
+    }
+    return false;
+}
+
+// creates a new JS "module" Object with default metadata properties
+QScriptValue ScriptEngine::newModule(const QString& modulePath, const QScriptValue& parent) {
+    auto closure = newObject();
+    auto exports = newObject();
+    auto module = newObject();
+    qCDebug(scriptengine_module) << "newModule" << modulePath << parent.property("filename").toString();
+
+    closure.setProperty("module", module, READONLY_PROP_FLAGS);
+
+    // note: this becomes the "exports" free variable, so should not be set read only
+    closure.setProperty("exports", exports);
+
+    // make the closure available to module instantiation
+    module.setProperty("__closure__", closure, READONLY_HIDDEN_PROP_FLAGS);
+
+    // for consistency with Node.js Module
+    module.setProperty("id", modulePath, READONLY_PROP_FLAGS);
+    module.setProperty("filename", modulePath, READONLY_PROP_FLAGS);
+    module.setProperty("exports", exports); // not readonly
+    module.setProperty("loaded", false, READONLY_PROP_FLAGS);
+    module.setProperty("parent", parent, READONLY_PROP_FLAGS);
+    module.setProperty("children", newArray(), READONLY_PROP_FLAGS);
+
+    // module.require is a bound version of require that always resolves relative to that module's path
+    auto boundRequire = QScriptEngine::evaluate("(function(id) { return Script.require(Script.require.resolve(id, this.filename)); })", "(boundRequire)");
+    module.setProperty("require", boundRequire, READONLY_PROP_FLAGS);
+
+    return module;
+}
+
+// synchronously fetch a module's source code using BatchLoader
+QVariantMap ScriptEngine::fetchModuleSource(const QString& modulePath, const bool forceDownload) {
+    using UrlMap = QMap<QUrl, QString>;
+    auto scriptCache = DependencyManager::get<ScriptCache>();
+    QVariantMap req;
+    qCDebug(scriptengine_module) << "require.fetchModuleSource: " << QUrl(modulePath).fileName() << QThread::currentThread();
+
+    auto onload = [=, &req](const UrlMap& data, const UrlMap& _status) {
+        auto url = modulePath;
+        auto status = _status[url];
+        auto contents = data[url];
+        qCDebug(scriptengine_module) << "require.fetchModuleSource.onload: " << QUrl(url).fileName() << status << QThread::currentThread();
+        if (isStopping()) {
+            req["status"] = "Stopped";
+            req["success"] = false;
+        } else {
+            req["url"] = url;
+            req["status"] = status;
+            req["success"] = ScriptCache::isSuccessStatus(status);
+            req["contents"] = contents;
+        }
+    };
+
+    if (forceDownload) {
+        qCDebug(scriptengine_module) << "require.requestScript -- clearing cache for" << modulePath;
+        scriptCache->deleteScript(modulePath);
+    }
+    BatchLoader* loader = new BatchLoader(QList<QUrl>({ modulePath }));
+    connect(loader, &BatchLoader::finished, this, onload);
+    connect(this, &QObject::destroyed, loader, &QObject::deleteLater);
+    // fail faster? (since require() blocks the engine thread while resolving dependencies)
+    const int MAX_RETRIES = 1;
+
+    loader->start(MAX_RETRIES);
+
+    if (!loader->isFinished()) {
+        QTimer monitor;
+        QEventLoop loop;
+        QObject::connect(loader, &BatchLoader::finished, this, [this, &monitor, &loop]{
+            monitor.stop();
+            loop.quit();
+        });
+
+        // this helps detect the case where stop() is invoked during the download
+        //  but not seen in time to abort processing in onload()...
+        connect(&monitor, &QTimer::timeout, this, [this, &loop, &loader]{
+            if (isStopping()) {
+                loop.exit(-1);
+            }
+        });
+        monitor.start(500);
+        loop.exec();
+    }
+    loader->deleteLater();
+    return req;
+}
+
+// evaluate a pending module object using the fetched source code
+QScriptValue ScriptEngine::instantiateModule(const QScriptValue& module, const QString& sourceCode) {
+    QScriptValue result;
+    auto modulePath = module.property("filename").toString();
+    auto closure = module.property("__closure__");
+
+    qCDebug(scriptengine_module) << QString("require.instantiateModule: %1 / %2 bytes")
+        .arg(QUrl(modulePath).fileName()).arg(sourceCode.length());
+
+    if (module.property("content-type").toString() == "application/json") {
+        qCDebug(scriptengine_module) << "... parsing as JSON";
+        closure.setProperty("__json", sourceCode);
+        result = evaluateInClosure(closure, { "module.exports = JSON.parse(__json)", modulePath });
+    } else {
+        // scoped vars for consistency with Node.js
+        closure.setProperty("require", module.property("require"));
+        closure.setProperty("__filename", modulePath, READONLY_HIDDEN_PROP_FLAGS);
+        closure.setProperty("__dirname", QString(modulePath).replace(QRegExp("/[^/]*$"), ""), READONLY_HIDDEN_PROP_FLAGS);
+        result = evaluateInClosure(closure, { sourceCode, modulePath });
+    }
+    maybeEmitUncaughtException(__FUNCTION__);
+    return result;
+}
+
+// CommonJS/Node.js like require/module support
+QScriptValue ScriptEngine::require(const QString& moduleId) {
+    qCDebug(scriptengine_module) << "ScriptEngine::require(" << moduleId.left(MAX_DEBUG_VALUE_LENGTH) << ")";
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return unboundNullValue();
+    }
+
+    auto jsRequire = globalObject().property("Script").property("require");
+    auto cacheMeta = jsRequire.data();
+    auto cache = jsRequire.property("cache");
+    auto parent = currentModule();
+
+    auto throwModuleError = [&](const QString& modulePath, const QScriptValue& error) {
+        cache.setProperty(modulePath, nullValue());
+        if (!error.isNull()) {
+#ifdef DEBUG_JS_MODULES
+            qCWarning(scriptengine_module) << "throwing module error:" << error.toString() << modulePath << error.property("stack").toString();
+#endif
+            raiseException(error);
+        }
+        maybeEmitUncaughtException("module");
+        return unboundNullValue();
+    };
+
+    // start by resolving the moduleId into a fully-qualified path/URL
+    QString modulePath = _requireResolve(moduleId);
+    if (modulePath.isNull() || hasUncaughtException()) {
+        // the resolver already threw an exception -- bail early
+        maybeEmitUncaughtException(__FUNCTION__);
+        return unboundNullValue();
+    }
+
+    // check the resolved path against the cache
+    auto module = cache.property(modulePath);
+
+    // modules get cached in `Script.require.cache` and (similar to Node.js) users can access it
+    // to inspect particular entries and invalidate them by deleting the key:
+    //   `delete Script.require.cache[Script.require.resolve(moduleId)];`
+
+    // cacheMeta is just used right now to tell deleted keys apart from undefined ones
+    bool invalidateCache = module.isUndefined() && cacheMeta.property(moduleId).isValid();
+
+    // reset the cacheMeta record so invalidation won't apply next time, even if the module fails to load
+    cacheMeta.setProperty(modulePath, QScriptValue());
+
+    auto exports = module.property("exports");
+    if (!invalidateCache && exports.isObject()) {
+        // we have found a cached module -- just need to possibly register it with current parent
+        qCDebug(scriptengine_module) << QString("require - using cached module '%1' for '%2' (loaded: %3)")
+            .arg(modulePath).arg(moduleId).arg(module.property("loaded").toString());
+        registerModuleWithParent(module, parent);
+        maybeEmitUncaughtException("cached module");
+        return exports;
+    }
+
+    // bootstrap / register new empty module
+    module = newModule(modulePath, parent);
+    registerModuleWithParent(module, parent);
+
+    // add it to the cache (this is done early so any cyclic dependencies pick up)
+    cache.setProperty(modulePath, module);
+
+    // download the module source
+    auto req = fetchModuleSource(modulePath, invalidateCache);
+
+    if (!req.contains("success") || !req["success"].toBool()) {
+        auto error = QString("error retrieving script (%1)").arg(req["status"].toString());
+        return throwModuleError(modulePath, error);
+    }
+
+#if DEBUG_JS_MODULES
+    qCDebug(scriptengine_module) << "require.loaded: " <<
+        QUrl(req["url"].toString()).fileName() << req["status"].toString();
+#endif
+
+    auto sourceCode = req["contents"].toString();
+
+    if (QUrl(modulePath).fileName().endsWith(".json", Qt::CaseInsensitive)) {
+        module.setProperty("content-type", "application/json");
+    } else {
+        module.setProperty("content-type", "application/javascript");
+    }
+
+    // evaluate the module
+    auto result = instantiateModule(module, sourceCode);
+
+    if (result.isError() && !result.strictlyEquals(module.property("exports"))) {
+        qCWarning(scriptengine_module) << "-- result.isError --" << result.toString();
+        return throwModuleError(modulePath, result);
+    }
+
+    // mark as fully-loaded
+    module.setProperty("loaded", true, READONLY_PROP_FLAGS);
+
+    // set up a new reference point for detecting cache key deletion
+    cacheMeta.setProperty(modulePath, module);
+
+    qCDebug(scriptengine_module) << "//ScriptEngine::require(" << moduleId << ")";
+
+    maybeEmitUncaughtException(__FUNCTION__);
+    return module.property("exports");
+}
+
 // If a callback is specified, the included files will be loaded asynchronously and the callback will be called
 // when all of the files have finished loading.
 // If no callback is specified, the included files will be loaded synchronously and will block execution until
 // all of the files have finished loading.
 void ScriptEngine::include(const QStringList& includeFiles, QScriptValue callback) {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return;
+    }
     if (DependencyManager::get<ScriptEngines>()->isStopped()) {
         scriptWarningMessage("Script.include() while shutting down is ignored... includeFiles:" 
                 + includeFiles.join(",") + "parent script:" + getFilename());
@@ -1361,7 +1767,7 @@ void ScriptEngine::include(const QStringList& includeFiles, QScriptValue callbac
 
                     doWithEnvironment(capturedEntityIdentifier, capturedSandboxURL, operation);
                     if (hasUncaughtException()) {
-                        emit unhandledException(cloneUncaughtException(__FUNCTION__));
+                        emit unhandledException(cloneUncaughtException("evaluateInclude"));
                         clearExceptions();
                     }
                 } else {
@@ -1408,6 +1814,9 @@ void ScriptEngine::include(const QString& includeFile, QScriptValue callback) {
 // as a stand-alone script. To accomplish this, the ScriptEngine class just emits a signal which
 // the Application or other context will connect to in order to know to actually load the script
 void ScriptEngine::load(const QString& loadFile) {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return;
+    }
     if (DependencyManager::get<ScriptEngines>()->isStopped()) {
         scriptWarningMessage("Script.load() while shutting down is ignored... loadFile:" 
                 + loadFile + "parent script:" + getFilename());
@@ -1477,6 +1886,52 @@ void ScriptEngine::updateEntityScriptStatus(const EntityItemID& entityID, const
     emit entityScriptDetailsUpdated();
 }
 
+QVariant ScriptEngine::cloneEntityScriptDetails(const EntityItemID& entityID) {
+    static const QVariant NULL_VARIANT { qVariantFromValue((QObject*)nullptr) };
+    QVariantMap map;
+    if (entityID.isNull()) {
+        // TODO: find better way to report JS Error across thread/process boundaries
+        map["isError"] = true;
+        map["errorInfo"] = "Error: getEntityScriptDetails -- invalid entityID";
+    } else {
+#ifdef DEBUG_ENTITY_STATES
+        qDebug() << "cloneEntityScriptDetails" << entityID << QThread::currentThread();
+#endif
+        EntityScriptDetails scriptDetails;
+        if (getEntityScriptDetails(entityID, scriptDetails)) {
+#ifdef DEBUG_ENTITY_STATES
+            qDebug() << "gotEntityScriptDetails" << scriptDetails.status << QThread::currentThread();
+#endif
+            map["isRunning"] = isEntityScriptRunning(entityID);
+            map["status"] = EntityScriptStatus_::valueToKey(scriptDetails.status).toLower();
+            map["errorInfo"] = scriptDetails.errorInfo;
+            map["entityID"] = entityID.toString();
+#ifdef DEBUG_ENTITY_STATES
+            {
+                auto debug = QVariantMap();
+                debug["script"] = scriptDetails.scriptText;
+                debug["scriptObject"] = scriptDetails.scriptObject.toVariant();
+                debug["lastModified"] = (qlonglong)scriptDetails.lastModified;
+                debug["sandboxURL"] = scriptDetails.definingSandboxURL;
+                map["debug"] = debug;
+            }
+#endif
+        } else {
+#ifdef DEBUG_ENTITY_STATES
+            qDebug() << "!gotEntityScriptDetails" <<  QThread::currentThread();
+#endif
+            map["isError"] = true;
+            map["errorInfo"] = "Entity script details unavailable";
+            map["entityID"] = entityID.toString();
+        }
+    }
+    return map;
+}
+
+QFuture<QVariant> ScriptEngine::getLocalEntityScriptDetails(const EntityItemID& entityID) {
+    return QtConcurrent::run(this, &ScriptEngine::cloneEntityScriptDetails, entityID);
+}
+
 bool ScriptEngine::getEntityScriptDetails(const EntityItemID& entityID, EntityScriptDetails &details) const {
     auto it = _entityScripts.constFind(entityID);
     if (it == _entityScripts.constEnd()) {
@@ -1615,10 +2070,10 @@ void ScriptEngine::loadEntityScript(const EntityItemID& entityID, const QString&
 
     auto scriptCache = DependencyManager::get<ScriptCache>();
     // note: see EntityTreeRenderer.cpp for shared pointer lifecycle management
-    QWeakPointer<ScriptEngine> weakRef(sharedFromThis());
+    QWeakPointer<BaseScriptEngine> weakRef(sharedFromThis());
     scriptCache->getScriptContents(entityScript,
         [this, weakRef, entityScript, entityID](const QString& url, const QString& contents, bool isURL, bool success, const QString& status) {
-            QSharedPointer<ScriptEngine> strongRef(weakRef);
+            QSharedPointer<BaseScriptEngine> strongRef(weakRef);
             if (!strongRef) {
                 qCWarning(scriptengine) << "loadEntityScript.contentAvailable -- ScriptEngine was deleted during getScriptContents!!";
                 return;
@@ -1737,13 +2192,12 @@ void ScriptEngine::entityScriptContentAvailable(const EntityItemID& entityID, co
         timeout.setSingleShot(true);
         timeout.start(SANDBOX_TIMEOUT);
         connect(&timeout, &QTimer::timeout, [&sandbox, SANDBOX_TIMEOUT, scriptOrURL]{
-            auto context = sandbox.currentContext();
-            if (context) {
                 qCDebug(scriptengine) << "ScriptEngine::entityScriptContentAvailable timeout(" << scriptOrURL << ")";
 
                 // Guard against infinite loops and non-performant code
-                context->throwError(QString("Timed out (entity constructors are limited to %1ms)").arg(SANDBOX_TIMEOUT));
-            }
+                sandbox.raiseException(
+                    sandbox.makeError(QString("Timed out (entity constructors are limited to %1ms)").arg(SANDBOX_TIMEOUT))
+                );
         });
 
         testConstructor = sandbox.evaluate(program);
@@ -1759,7 +2213,7 @@ void ScriptEngine::entityScriptContentAvailable(const EntityItemID& entityID, co
     if (exception.isError()) {
         // create a local copy using makeError to decouple from the sandbox engine
         exception = makeError(exception);
-        setError(formatException(exception), EntityScriptStatus::ERROR_RUNNING_SCRIPT);
+        setError(formatException(exception, _enableExtendedJSExceptions.get()), EntityScriptStatus::ERROR_RUNNING_SCRIPT);
         emit unhandledException(exception);
         return;
     }
@@ -1771,9 +2225,8 @@ void ScriptEngine::entityScriptContentAvailable(const EntityItemID& entityID, co
             testConstructorType = "empty";
         }
         QString testConstructorValue = testConstructor.toString();
-        const int maxTestConstructorValueSize = 80;
-        if (testConstructorValue.size() > maxTestConstructorValueSize) {
-            testConstructorValue = testConstructorValue.mid(0, maxTestConstructorValueSize) + "...";
+        if (testConstructorValue.size() > MAX_DEBUG_VALUE_LENGTH) {
+            testConstructorValue = testConstructorValue.mid(0, MAX_DEBUG_VALUE_LENGTH) + "...";
         }
         auto message = QString("failed to load entity script -- expected a function, got %1, %2")
             .arg(testConstructorType).arg(testConstructorValue);
@@ -1811,7 +2264,7 @@ void ScriptEngine::entityScriptContentAvailable(const EntityItemID& entityID, co
 
     if (entityScriptObject.isError()) {
         auto exception = entityScriptObject;
-        setError(formatException(exception), EntityScriptStatus::ERROR_RUNNING_SCRIPT);
+        setError(formatException(exception, _enableExtendedJSExceptions.get()), EntityScriptStatus::ERROR_RUNNING_SCRIPT);
         emit unhandledException(exception);
         return;
     }
@@ -1855,10 +2308,12 @@ void ScriptEngine::unloadEntityScript(const EntityItemID& entityID, bool shouldR
         const EntityScriptDetails &oldDetails = _entityScripts[entityID];
         if (isEntityScriptRunning(entityID)) {
             callEntityScriptMethod(entityID, "unload");
-        } else {
+        }
+#ifdef DEBUG_ENTITY_STATES
+        else {
             qCDebug(scriptengine) << "unload called while !running" << entityID << oldDetails.status;
         }
-
+#endif
         if (shouldRemoveFromMap) {
             // this was a deleted entity, we've been asked to remove it from the map
             _entityScripts.remove(entityID);
@@ -1950,10 +2405,7 @@ void ScriptEngine::doWithEnvironment(const EntityItemID& entityID, const QUrl& s
 #else
     operation();
 #endif
-    if (!isEvaluating() && hasUncaughtException()) {
-        emit unhandledException(cloneUncaughtException(!entityID.isNull() ? entityID.toString() : __FUNCTION__));
-        clearExceptions();
-    }
+    maybeEmitUncaughtException(!entityID.isNull() ? entityID.toString() : __FUNCTION__);
     currentEntityIdentifier = oldIdentifier;
     currentSandboxURL = oldSandboxURL;
 }
diff --git a/libraries/script-engine/src/ScriptEngine.h b/libraries/script-engine/src/ScriptEngine.h
index 681499779c..95f377d92b 100644
--- a/libraries/script-engine/src/ScriptEngine.h
+++ b/libraries/script-engine/src/ScriptEngine.h
@@ -41,6 +41,7 @@
 #include "ScriptCache.h"
 #include "ScriptUUID.h"
 #include "Vec3.h"
+#include "SettingHandle.h"
 
 class QScriptEngineDebugger;
 
@@ -78,7 +79,7 @@ public:
     QUrl definingSandboxURL { QUrl("about:EntityScript") };
 };
 
-class ScriptEngine : public BaseScriptEngine, public EntitiesScriptEngineProvider, public QEnableSharedFromThis<ScriptEngine> {
+class ScriptEngine : public BaseScriptEngine, public EntitiesScriptEngineProvider {
     Q_OBJECT
     Q_PROPERTY(QString context READ getContext)
 public:
@@ -137,6 +138,8 @@ public:
     /// evaluate some code in the context of the ScriptEngine and return the result
     Q_INVOKABLE QScriptValue evaluate(const QString& program, const QString& fileName, int lineNumber = 1); // this is also used by the script tool widget
 
+    Q_INVOKABLE QScriptValue evaluateInClosure(const QScriptValue& locals, const QScriptProgram& program);
+
     /// 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
@@ -157,6 +160,16 @@ public:
     Q_INVOKABLE void include(const QStringList& includeFiles, QScriptValue callback = QScriptValue());
     Q_INVOKABLE void include(const QString& includeFile, QScriptValue callback = QScriptValue());
 
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    // MODULE related methods
+    Q_INVOKABLE QScriptValue require(const QString& moduleId);
+    Q_INVOKABLE void resetModuleCache(bool deleteScriptCache = false);
+    QScriptValue currentModule();
+    bool registerModuleWithParent(const QScriptValue& module, const QScriptValue& parent);
+    QScriptValue newModule(const QString& modulePath, const QScriptValue& parent = QScriptValue());
+    QVariantMap fetchModuleSource(const QString& modulePath, const bool forceDownload = false);
+    QScriptValue instantiateModule(const QScriptValue& module, const QString& sourceCode);
+
     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)); }
@@ -170,6 +183,8 @@ public:
     Q_INVOKABLE bool isEntityScriptRunning(const EntityItemID& entityID) {
         return _entityScripts.contains(entityID) && _entityScripts[entityID].status == EntityScriptStatus::RUNNING;
     }
+    QVariant cloneEntityScriptDetails(const EntityItemID& entityID);
+    QFuture<QVariant> getLocalEntityScriptDetails(const EntityItemID& entityID) override;
     Q_INVOKABLE void loadEntityScript(const EntityItemID& entityID, const QString& entityScript, bool forceRedownload);
     Q_INVOKABLE void unloadEntityScript(const EntityItemID& entityID, bool shouldRemoveFromMap = false); // will call unload method
     Q_INVOKABLE void unloadAllEntityScripts();
@@ -237,6 +252,9 @@ signals:
 protected:
     void init();
     Q_INVOKABLE void executeOnScriptThread(std::function<void()> function, const Qt::ConnectionType& type = Qt::QueuedConnection );
+    // note: this is not meant to be called directly, but just to have QMetaObject take care of wiring it up in general;
+    //   then inside of init() we just have to do "Script.require.resolve = Script._requireResolve;"
+    Q_INVOKABLE QString _requireResolve(const QString& moduleId, const QString& relativeTo = QString());
 
     QString logException(const QScriptValue& exception);
     void timerFired();
@@ -290,11 +308,16 @@ protected:
 
     AssetScriptingInterface _assetScriptingInterface{ this };
 
-    std::function<bool()> _emitScriptUpdates{ [](){ return true; }  };
+    std::function<bool()> _emitScriptUpdates{ []() { return true; }  };
 
     std::recursive_mutex _lock;
 
     std::chrono::microseconds _totalTimerExecution { 0 };
+
+    static const QString _SETTINGS_ENABLE_EXTENDED_MODULE_COMPAT;
+    static const QString _SETTINGS_ENABLE_EXTENDED_EXCEPTIONS;
+
+    Setting::Handle<bool> _enableExtendedJSExceptions { _SETTINGS_ENABLE_EXTENDED_EXCEPTIONS, true };
 };
 
 #endif // hifi_ScriptEngine_h
diff --git a/libraries/script-engine/src/ScriptEngineLogging.cpp b/libraries/script-engine/src/ScriptEngineLogging.cpp
index 2e5d293728..392bc05129 100644
--- a/libraries/script-engine/src/ScriptEngineLogging.cpp
+++ b/libraries/script-engine/src/ScriptEngineLogging.cpp
@@ -12,3 +12,4 @@
 #include "ScriptEngineLogging.h"
 
 Q_LOGGING_CATEGORY(scriptengine, "hifi.scriptengine")
+Q_LOGGING_CATEGORY(scriptengine_module, "hifi.scriptengine.module")
diff --git a/libraries/script-engine/src/ScriptEngineLogging.h b/libraries/script-engine/src/ScriptEngineLogging.h
index 0e614dd5bf..62e46632a6 100644
--- a/libraries/script-engine/src/ScriptEngineLogging.h
+++ b/libraries/script-engine/src/ScriptEngineLogging.h
@@ -15,6 +15,7 @@
 #include <QLoggingCategory>
 
 Q_DECLARE_LOGGING_CATEGORY(scriptengine)
+Q_DECLARE_LOGGING_CATEGORY(scriptengine_module)
 
 #endif // hifi_ScriptEngineLogging_h
 
diff --git a/libraries/script-engine/src/BaseScriptEngine.cpp b/libraries/shared/src/BaseScriptEngine.cpp
similarity index 68%
rename from libraries/script-engine/src/BaseScriptEngine.cpp
rename to libraries/shared/src/BaseScriptEngine.cpp
index 16308c0650..c92d629b75 100644
--- a/libraries/script-engine/src/BaseScriptEngine.cpp
+++ b/libraries/shared/src/BaseScriptEngine.cpp
@@ -10,6 +10,7 @@
 //
 
 #include "BaseScriptEngine.h"
+#include "SharedLogging.h"
 
 #include <QtCore/QString>
 #include <QtCore/QThread>
@@ -18,18 +19,27 @@
 #include <QtScript/QScriptValueIterator>
 #include <QtScript/QScriptContextInfo>
 
-#include "ScriptEngineLogging.h"
 #include "Profile.h"
 
-const QString BaseScriptEngine::_SETTINGS_ENABLE_EXTENDED_EXCEPTIONS {
-    "com.highfidelity.experimental.enableExtendedJSExceptions"
-};
-
 const QString BaseScriptEngine::SCRIPT_EXCEPTION_FORMAT { "[%0] %1 in %2:%3" };
 const QString BaseScriptEngine::SCRIPT_BACKTRACE_SEP { "\n    " };
 
+bool BaseScriptEngine::IS_THREADSAFE_INVOCATION(const QThread *thread, const QString& method) {
+    if (QThread::currentThread() == thread) {
+        return true;
+    }
+    qCCritical(shared) << QString("Scripting::%1 @ %2 -- ignoring thread-unsafe call from %3")
+        .arg(method).arg(thread ? thread->objectName() : "(!thread)").arg(QThread::currentThread()->objectName());
+    qCDebug(shared) << "(please resolve on the calling side by using invokeMethod, executeOnScriptThread, etc.)";
+    Q_ASSERT(false);
+    return false;
+}
+
 // engine-aware JS Error copier and factory
 QScriptValue BaseScriptEngine::makeError(const QScriptValue& _other, const QString& type) {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return unboundNullValue();
+    }
     auto other = _other;
     if (other.isString()) {
         other = newObject();
@@ -41,7 +51,7 @@ QScriptValue BaseScriptEngine::makeError(const QScriptValue& _other, const QStri
     }
     if (!proto.isFunction()) {
 #ifdef DEBUG_JS_EXCEPTIONS
-        qCDebug(scriptengine) << "BaseScriptEngine::makeError -- couldn't find constructor for" << type << " -- using Error instead";
+        qCDebug(shared) << "BaseScriptEngine::makeError -- couldn't find constructor for" << type << " -- using Error instead";
 #endif
         proto = globalObject().property("Error");
     }
@@ -64,6 +74,9 @@ QScriptValue BaseScriptEngine::makeError(const QScriptValue& _other, const QStri
 
 // check syntax and when there are issues returns an actual "SyntaxError" with the details
 QScriptValue BaseScriptEngine::lintScript(const QString& sourceCode, const QString& fileName, const int lineNumber) {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return unboundNullValue();
+    }
     const auto syntaxCheck = checkSyntax(sourceCode);
     if (syntaxCheck.state() != QScriptSyntaxCheckResult::Valid) {
         auto err = globalObject().property("SyntaxError")
@@ -82,13 +95,16 @@ QScriptValue BaseScriptEngine::lintScript(const QString& sourceCode, const QStri
         }
         return err;
     }
-    return undefinedValue();
+    return QScriptValue();
 }
 
 // this pulls from the best available information to create a detailed snapshot of the current exception
 QScriptValue BaseScriptEngine::cloneUncaughtException(const QString& extraDetail) {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return unboundNullValue();
+    }
     if (!hasUncaughtException()) {
-        return QScriptValue();
+        return unboundNullValue();
     }
     auto exception = uncaughtException();
     // ensure the error object is engine-local
@@ -144,7 +160,10 @@ QScriptValue BaseScriptEngine::cloneUncaughtException(const QString& extraDetail
     return err;
 }
 
-QString BaseScriptEngine::formatException(const QScriptValue& exception) {
+QString BaseScriptEngine::formatException(const QScriptValue& exception, bool includeExtendedDetails) {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return QString();
+    }
     QString note { "UncaughtException" };
     QString result;
 
@@ -156,8 +175,8 @@ QString BaseScriptEngine::formatException(const QScriptValue& exception) {
     const auto lineNumber = exception.property("lineNumber").toString();
     const auto stacktrace =  exception.property("stack").toString();
 
-    if (_enableExtendedJSExceptions.get()) {
-        // This setting toggles display of the hints now being added during the loading process.
+    if (includeExtendedDetails) {
+        // Display additional exception / troubleshooting hints that can be added via the custom Error .detail property
         // Example difference:
         //   [UncaughtExceptions] Error: Can't find variable: foobar in atp:/myentity.js\n...
         //   [UncaughtException (construct {1eb5d3fa-23b1-411c-af83-163af7220e3f})] Error: Can't find variable: foobar in atp:/myentity.js\n...
@@ -173,14 +192,39 @@ QString BaseScriptEngine::formatException(const QScriptValue& exception) {
     return result;
 }
 
+bool BaseScriptEngine::raiseException(const QScriptValue& exception) {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return false;
+    }
+    if (currentContext()) {
+        // we have an active context / JS stack frame so throw the exception per usual
+        currentContext()->throwValue(makeError(exception));
+        return true;
+    } else {
+        // we are within a pure C++ stack frame (ie: being called directly by other C++ code)
+        // in this case no context information is available so just emit the exception for reporting
+        emit unhandledException(makeError(exception));
+    }
+    return false;
+}
+
+bool BaseScriptEngine::maybeEmitUncaughtException(const QString& debugHint) {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return false;
+    }
+    if (!isEvaluating() && hasUncaughtException()) {
+        emit unhandledException(cloneUncaughtException(debugHint));
+        clearExceptions();
+        return true;
+    }
+    return false;
+}
+
 QScriptValue BaseScriptEngine::evaluateInClosure(const QScriptValue& closure, const QScriptProgram& program) {
     PROFILE_RANGE(script, "evaluateInClosure");
-    if (QThread::currentThread() != thread()) {
-        qCCritical(scriptengine) << "*** CRITICAL *** ScriptEngine::evaluateInClosure() is meant to be called from engine thread only.";
-        // note: a recursive mutex might be needed around below code if this method ever becomes Q_INVOKABLE
-        return QScriptValue();
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return unboundNullValue();
     }
-
     const auto fileName = program.fileName();
     const auto shortName = QUrl(fileName).fileName();
 
@@ -189,7 +233,7 @@ QScriptValue BaseScriptEngine::evaluateInClosure(const QScriptValue& closure, co
     auto global = closure.property("global");
     if (global.isObject()) {
 #ifdef DEBUG_JS
-        qCDebug(scriptengine) << " setting global = closure.global" << shortName;
+        qCDebug(shared) << " setting global = closure.global" << shortName;
 #endif
         oldGlobal = globalObject();
         setGlobalObject(global);
@@ -200,34 +244,34 @@ QScriptValue BaseScriptEngine::evaluateInClosure(const QScriptValue& closure, co
     auto thiz = closure.property("this");
     if (thiz.isObject()) {
 #ifdef DEBUG_JS
-        qCDebug(scriptengine) << " setting this = closure.this" << shortName;
+        qCDebug(shared) << " setting this = closure.this" << shortName;
 #endif
         context->setThisObject(thiz);
     }
 
     context->pushScope(closure);
 #ifdef DEBUG_JS
-    qCDebug(scriptengine) << QString("[%1] evaluateInClosure %2").arg(isEvaluating()).arg(shortName);
+    qCDebug(shared) << QString("[%1] evaluateInClosure %2").arg(isEvaluating()).arg(shortName);
 #endif
     {
         result = BaseScriptEngine::evaluate(program);
         if (hasUncaughtException()) {
             auto err = cloneUncaughtException(__FUNCTION__);
 #ifdef DEBUG_JS_EXCEPTIONS
-            qCWarning(scriptengine) << __FUNCTION__ << "---------- hasCaught:" << err.toString() << result.toString();
+            qCWarning(shared) << __FUNCTION__ << "---------- hasCaught:" << err.toString() << result.toString();
             err.setProperty("_result", result);
 #endif
             result = err;
         }
     }
 #ifdef DEBUG_JS
-    qCDebug(scriptengine) << QString("[%1] //evaluateInClosure %2").arg(isEvaluating()).arg(shortName);
+    qCDebug(shared) << QString("[%1] //evaluateInClosure %2").arg(isEvaluating()).arg(shortName);
 #endif
     popContext();
 
     if (oldGlobal.isValid()) {
 #ifdef DEBUG_JS
-        qCDebug(scriptengine) << " restoring global" << shortName;
+        qCDebug(shared) << " restoring global" << shortName;
 #endif
         setGlobalObject(oldGlobal);
     }
@@ -236,7 +280,6 @@ QScriptValue BaseScriptEngine::evaluateInClosure(const QScriptValue& closure, co
 }
 
 // Lambda
-
 QScriptValue BaseScriptEngine::newLambdaFunction(std::function<QScriptValue(QScriptContext *, QScriptEngine*)> operation, const QScriptValue& data, const QScriptEngine::ValueOwnership& ownership) {
     auto lambda = new Lambda(this, operation, data);
     auto object = newQObject(lambda, ownership);
@@ -262,26 +305,57 @@ Lambda::Lambda(QScriptEngine *engine, std::function<QScriptValue(QScriptContext
 #endif
 }
 QScriptValue Lambda::call() {
+    if (!BaseScriptEngine::IS_THREADSAFE_INVOCATION(engine->thread(), __FUNCTION__)) {
+        return BaseScriptEngine::unboundNullValue();
+    }
     return operation(engine->currentContext(), engine);
 }
 
+QScriptValue makeScopedHandlerObject(QScriptValue scopeOrCallback, QScriptValue methodOrName) {
+    auto engine = scopeOrCallback.engine();
+    if (!engine) {
+        return scopeOrCallback;
+    }
+    auto scope = QScriptValue();
+    auto callback = scopeOrCallback;
+    if (scopeOrCallback.isObject()) {
+        if (methodOrName.isString()) {
+            scope = scopeOrCallback;
+            callback = scope.property(methodOrName.toString());
+        } else if (methodOrName.isFunction()) {
+            scope = scopeOrCallback;
+            callback = methodOrName;
+        }
+    }
+    auto handler = engine->newObject();
+    handler.setProperty("scope", scope);
+    handler.setProperty("callback", callback);
+    return handler;
+}
+
+QScriptValue callScopedHandlerObject(QScriptValue handler, QScriptValue err, QScriptValue result) {
+    return handler.property("callback").call(handler.property("scope"), QScriptValueList({ err, result }));
+}
+
 #ifdef DEBUG_JS
 void BaseScriptEngine::_debugDump(const QString& header, const QScriptValue& object, const QString& footer) {
+    if (!IS_THREADSAFE_INVOCATION(thread(), __FUNCTION__)) {
+        return;
+    }
     if (!header.isEmpty()) {
-        qCDebug(scriptengine) << header;
+        qCDebug(shared) << header;
     }
     if (!object.isObject()) {
-        qCDebug(scriptengine) << "(!isObject)" << object.toVariant().toString() << object.toString();
+        qCDebug(shared) << "(!isObject)" << object.toVariant().toString() << object.toString();
         return;
     }
     QScriptValueIterator it(object);
     while (it.hasNext()) {
         it.next();
-        qCDebug(scriptengine) << it.name() << ":" << it.value().toString();
+        qCDebug(shared) << it.name() << ":" << it.value().toString();
     }
     if (!footer.isEmpty()) {
-        qCDebug(scriptengine) << footer;
+        qCDebug(shared) << footer;
     }
 }
 #endif
-
diff --git a/libraries/shared/src/BaseScriptEngine.h b/libraries/shared/src/BaseScriptEngine.h
new file mode 100644
index 0000000000..138e46fafa
--- /dev/null
+++ b/libraries/shared/src/BaseScriptEngine.h
@@ -0,0 +1,90 @@
+//
+//  BaseScriptEngine.h
+//  libraries/script-engine/src
+//
+//  Created by Timothy Dedischew on 02/01/17.
+//  Copyright 2017 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#ifndef hifi_BaseScriptEngine_h
+#define hifi_BaseScriptEngine_h
+
+#include <functional>
+#include <QtCore/QDebug>
+#include <QtScript/QScriptEngine>
+
+// common base class for extending QScriptEngine itself
+class BaseScriptEngine : public QScriptEngine, public QEnableSharedFromThis<BaseScriptEngine> {
+    Q_OBJECT
+public:
+    static const QString SCRIPT_EXCEPTION_FORMAT;
+    static const QString SCRIPT_BACKTRACE_SEP;
+
+    // threadsafe "unbound" version of QScriptEngine::nullValue()
+    static const QScriptValue unboundNullValue() { return QScriptValue(0, QScriptValue::NullValue); }
+
+    BaseScriptEngine() {}
+
+    Q_INVOKABLE QScriptValue lintScript(const QString& sourceCode, const QString& fileName, const int lineNumber = 1);
+    Q_INVOKABLE QScriptValue makeError(const QScriptValue& other = QScriptValue(), const QString& type = "Error");
+    Q_INVOKABLE QString formatException(const QScriptValue& exception, bool includeExtendedDetails);
+
+    QScriptValue cloneUncaughtException(const QString& detail = QString());
+    QScriptValue evaluateInClosure(const QScriptValue& locals, const QScriptProgram& program);
+
+    // if there is a pending exception and we are at the top level (non-recursive) stack frame, this emits and resets it
+    bool maybeEmitUncaughtException(const QString& debugHint = QString());
+
+    // if the currentContext() is valid then throw the passed exception; otherwise, immediately emit it.
+    // note: this is used in cases where C++ code might call into JS API methods directly
+    bool raiseException(const QScriptValue& exception);
+
+    // helper to detect and log warnings when other code invokes QScriptEngine/BaseScriptEngine in thread-unsafe ways
+    static bool IS_THREADSAFE_INVOCATION(const QThread *thread, const QString& method);
+signals:
+    void unhandledException(const QScriptValue& exception);
+
+protected:
+    // like `newFunction`, but allows mapping inline C++ lambdas with captures as callable QScriptValues
+    // even though the context/engine parameters are redundant in most cases, the function signature matches `newFunction`
+    // anyway so that newLambdaFunction can be used to rapidly prototype / test utility APIs and then if becoming
+    // permanent more easily promoted into regular static newFunction scenarios.
+    QScriptValue newLambdaFunction(std::function<QScriptValue(QScriptContext *context, QScriptEngine* engine)> operation, const QScriptValue& data = QScriptValue(), const QScriptEngine::ValueOwnership& ownership = QScriptEngine::AutoOwnership);
+
+#ifdef DEBUG_JS
+    static void _debugDump(const QString& header, const QScriptValue& object, const QString& footer = QString());
+#endif
+};
+
+// Standardized CPS callback helpers (see: http://fredkschott.com/post/2014/03/understanding-error-first-callbacks-in-node-js/)
+// These two helpers allow async JS APIs that use a callback parameter to be more friendly to scripters by accepting thisObject
+// context and adopting a consistent and intuitable callback signature:
+//   function callback(err, result) { if (err) { ... } else { /* do stuff with result */ } }
+//
+// To use, first pass the user-specified callback args in the same order used with optionally-scoped  Qt signal connections:
+//   auto handler = makeScopedHandlerObject(scopeOrCallback, optionalMethodOrName);
+// And then invoke the scoped handler later per CPS conventions:
+//   auto result = callScopedHandlerObject(handler, err, result);
+QScriptValue makeScopedHandlerObject(QScriptValue scopeOrCallback, QScriptValue methodOrName);
+QScriptValue callScopedHandlerObject(QScriptValue handler, QScriptValue err, QScriptValue result);
+
+// Lambda helps create callable QScriptValues out of std::functions:
+// (just meant for use from within the script engine itself)
+class Lambda : public QObject {
+    Q_OBJECT
+public:
+    Lambda(QScriptEngine *engine, std::function<QScriptValue(QScriptContext *context, QScriptEngine* engine)> operation, QScriptValue data);
+    ~Lambda();
+    public slots:
+        QScriptValue call();
+    QString toString() const;
+private:
+    QScriptEngine* engine;
+    std::function<QScriptValue(QScriptContext *context, QScriptEngine* engine)> operation;
+    QScriptValue data;
+};
+
+#endif // hifi_BaseScriptEngine_h
diff --git a/libraries/shared/src/RenderArgs.h b/libraries/shared/src/RenderArgs.h
index b2c05b0548..50722c0deb 100644
--- a/libraries/shared/src/RenderArgs.h
+++ b/libraries/shared/src/RenderArgs.h
@@ -122,6 +122,7 @@ public:
     gpu::Batch* _batch = nullptr;
 
     std::shared_ptr<gpu::Texture> _whiteTexture;
+    uint32_t _globalShapeKey { 0 };
     bool _enableTexturing { true };
 
     RenderDetails _details;
diff --git a/scripts/developer/libraries/jasmine/hifi-boot.js b/scripts/developer/libraries/jasmine/hifi-boot.js
index f490a3618f..772dd8c17e 100644
--- a/scripts/developer/libraries/jasmine/hifi-boot.js
+++ b/scripts/developer/libraries/jasmine/hifi-boot.js
@@ -6,7 +6,7 @@
     var lastSpecStartTime;
     function ConsoleReporter(options) {
         var startTime = new Date().getTime();
-        var errorCount = 0;
+        var errorCount = 0, pending = [];
         this.jasmineStarted = function (obj) {
             print('Jasmine started with ' + obj.totalSpecsDefined + ' tests.');
         };
@@ -15,11 +15,14 @@
             var endTime = new Date().getTime();
             print('<hr />');
             if (errorCount === 0) {
-                print ('<span style="color:green">All tests passed!</span>');
+                print ('<span style="color:green">All enabled tests passed!</span>');
             } else {
                 print('<span style="color:red">Tests completed with ' +
                     errorCount + ' ' + ERROR + '.<span>');
             }
+            if (pending.length)
+                print ('<span style="color:darkorange">disabled: <br />&nbsp;&nbsp;&nbsp;'+
+                       pending.join('<br />&nbsp;&nbsp;&nbsp;')+'</span>');
             print('Tests completed in ' + (endTime - startTime) + 'ms.');
         };
         this.suiteStarted = function(obj) {
@@ -32,6 +35,10 @@
             lastSpecStartTime = new Date().getTime();
         };
         this.specDone = function(obj) {
+            if (obj.status === 'pending') {
+                pending.push(obj.fullName);
+                return print('...(pending ' + obj.fullName +')');
+            }
             var specEndTime = new Date().getTime();
             var symbol = obj.status === PASSED ?
                 '<span style="color:green">' + CHECKMARK + '</span>' :
@@ -55,7 +62,7 @@
     clearTimeout = Script.clearTimeout;
     clearInterval = Script.clearInterval;
 
-    var jasmine = jasmineRequire.core(jasmineRequire);
+    var jasmine = this.jasmine = jasmineRequire.core(jasmineRequire);
 
     var env = jasmine.getEnv();
 
diff --git a/scripts/developer/tests/unit_tests/moduleTests/cycles/a.js b/scripts/developer/tests/unit_tests/moduleTests/cycles/a.js
new file mode 100644
index 0000000000..265cfaa2df
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/cycles/a.js
@@ -0,0 +1,10 @@
+/* eslint-env node */
+var a = exports;
+a.done = false;
+var b = require('./b.js');
+a.done = true;
+a.name = 'a';
+a['a.done?'] = a.done;
+a['b.done?'] = b.done;
+
+print('from a.js a.done =', a.done, '/ b.done =', b.done);
diff --git a/scripts/developer/tests/unit_tests/moduleTests/cycles/b.js b/scripts/developer/tests/unit_tests/moduleTests/cycles/b.js
new file mode 100644
index 0000000000..c46c872828
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/cycles/b.js
@@ -0,0 +1,10 @@
+/* eslint-env node */
+var b = exports;
+b.done = false;
+var a = require('./a.js');
+b.done = true;
+b.name = 'b';
+b['a.done?'] = a.done;
+b['b.done?'] = b.done;
+
+print('from b.js a.done =', a.done, '/ b.done =', b.done);
diff --git a/scripts/developer/tests/unit_tests/moduleTests/cycles/main.js b/scripts/developer/tests/unit_tests/moduleTests/cycles/main.js
new file mode 100644
index 0000000000..0ec39cd656
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/cycles/main.js
@@ -0,0 +1,17 @@
+/* eslint-env node */
+/* global print */
+/* eslint-disable comma-dangle */
+
+print('main.js');
+var a = require('./a.js'),
+    b = require('./b.js');
+
+print('from main.js a.done =', a.done, 'and b.done =', b.done);
+
+module.exports = {
+    name: 'main',
+    a: a,
+    b: b,
+    'a.done?': a.done,
+    'b.done?': b.done,
+};
diff --git a/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorAPIException.js b/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorAPIException.js
new file mode 100644
index 0000000000..bbe694b578
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorAPIException.js
@@ -0,0 +1,13 @@
+/* eslint-disable comma-dangle */
+// test module method exception being thrown within main constructor
+(function() {
+    var apiMethod = Script.require('../exceptions/exceptionInFunction.js');
+    print(Script.resolvePath(''), "apiMethod", apiMethod);
+    // this next line throws from within apiMethod
+    print(apiMethod());
+    return {
+        preload: function(uuid) {
+            print("entityConstructorAPIException::preload -- never seen --", uuid, Script.resolvePath(''));
+        },
+    };
+});
diff --git a/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorModule.js b/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorModule.js
new file mode 100644
index 0000000000..a4e8c17ab6
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorModule.js
@@ -0,0 +1,23 @@
+/* global module */
+/* eslint-disable comma-dangle */
+// test dual-purpose module and standalone Entity script
+function MyEntity(filename) {
+    return {
+        preload: function(uuid) {
+            print("entityConstructorModule.js::preload");
+            if (typeof module === 'object') {
+                print("module.filename", module.filename);
+                print("module.parent.filename", module.parent && module.parent.filename);
+            }
+        },
+        clickDownOnEntity: function(uuid, evt) {
+            print("entityConstructorModule.js::clickDownOnEntity");
+        },
+    };
+}
+
+try {
+    module.exports = MyEntity;
+} catch (e) {} // eslint-disable-line no-empty
+print('entityConstructorModule::MyEntity', typeof MyEntity);
+(MyEntity);
diff --git a/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorNested.js b/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorNested.js
new file mode 100644
index 0000000000..a90d979877
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorNested.js
@@ -0,0 +1,14 @@
+/* global module */
+// test Entity constructor based on inherited constructor from a module
+function constructor() {
+    print("entityConstructorNested::constructor");
+    var MyEntity = Script.require('./entityConstructorModule.js');
+    return new MyEntity("-- created from entityConstructorNested --");
+}
+
+try {
+    module.exports = constructor;
+} catch (e) {
+    constructor;
+}
+
diff --git a/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorNested2.js b/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorNested2.js
new file mode 100644
index 0000000000..29e0ed65b1
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorNested2.js
@@ -0,0 +1,25 @@
+/* global module */
+// test Entity constructor based on nested, inherited module constructors
+function constructor() {
+    print("entityConstructorNested2::constructor");
+
+    // inherit from entityConstructorNested
+    var MyEntity = Script.require('./entityConstructorNested.js');
+    function SubEntity() {}
+    SubEntity.prototype = new MyEntity('-- created from entityConstructorNested2 --');
+
+    // create new instance
+    var entity = new SubEntity();
+    // "override" clickDownOnEntity for just this new instance
+    entity.clickDownOnEntity = function(uuid, evt) {
+        print("entityConstructorNested2::clickDownOnEntity");
+        SubEntity.prototype.clickDownOnEntity.apply(this, arguments);
+    };
+    return entity;
+}
+
+try {
+    module.exports = constructor;
+} catch (e) {
+    constructor;
+}
diff --git a/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorRequireException.js b/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorRequireException.js
new file mode 100644
index 0000000000..5872bce529
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/entity/entityConstructorRequireException.js
@@ -0,0 +1,10 @@
+/* eslint-disable comma-dangle */
+// test module-related exception from within "require" evaluation itself
+(function() {
+    var mod = Script.require('../exceptions/exception.js');
+    return {
+        preload: function(uuid) {
+            print("entityConstructorRequireException::preload (never happens)", uuid, Script.resolvePath(''), mod);
+        },
+    };
+});
diff --git a/scripts/developer/tests/unit_tests/moduleTests/entity/entityPreloadAPIError.js b/scripts/developer/tests/unit_tests/moduleTests/entity/entityPreloadAPIError.js
new file mode 100644
index 0000000000..eaee178b0a
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/entity/entityPreloadAPIError.js
@@ -0,0 +1,13 @@
+/* eslint-disable comma-dangle */
+// test module method exception being thrown within preload
+(function() {
+    var apiMethod = Script.require('../exceptions/exceptionInFunction.js');
+    print(Script.resolvePath(''), "apiMethod", apiMethod);
+    return {
+        preload: function(uuid) {
+            // this next line throws from within apiMethod
+            print(apiMethod());
+            print("entityPreloadAPIException::preload -- never seen --", uuid, Script.resolvePath(''));
+        },
+    };
+});
diff --git a/scripts/developer/tests/unit_tests/moduleTests/entity/entityPreloadRequire.js b/scripts/developer/tests/unit_tests/moduleTests/entity/entityPreloadRequire.js
new file mode 100644
index 0000000000..50dab9fa7c
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/entity/entityPreloadRequire.js
@@ -0,0 +1,11 @@
+/* eslint-disable comma-dangle */
+// test requiring a module from within preload
+(function constructor() {
+    return {
+        preload: function(uuid) {
+            print("entityPreloadRequire::preload");
+            var example = Script.require('../example.json');
+            print("entityPreloadRequire::example::name", example.name);
+        },
+    };
+});
diff --git a/scripts/developer/tests/unit_tests/moduleTests/example.json b/scripts/developer/tests/unit_tests/moduleTests/example.json
new file mode 100644
index 0000000000..42d7fe07da
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/example.json
@@ -0,0 +1,9 @@
+{
+    "name": "Example JSON Module",
+    "last-modified": 1485789862,
+    "config": {
+        "title": "My Title",
+        "width": 800,
+        "height": 600
+    }
+}
diff --git a/scripts/developer/tests/unit_tests/moduleTests/exceptions/exception.js b/scripts/developer/tests/unit_tests/moduleTests/exceptions/exception.js
new file mode 100644
index 0000000000..8d25d6b7a4
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/exceptions/exception.js
@@ -0,0 +1,4 @@
+/* eslint-env node */
+module.exports = "n/a";
+throw new Error('exception on line 2');
+
diff --git a/scripts/developer/tests/unit_tests/moduleTests/exceptions/exceptionInFunction.js b/scripts/developer/tests/unit_tests/moduleTests/exceptions/exceptionInFunction.js
new file mode 100644
index 0000000000..69415a0741
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleTests/exceptions/exceptionInFunction.js
@@ -0,0 +1,38 @@
+/* eslint-env node */
+//  dummy lines to make sure exception line number is well below parent test script
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+//
+
+
+function myfunc() {
+    throw new Error('exception on line 32 in myfunc');
+}
+module.exports = myfunc;
+if (Script[module.filename] === 'throw') {
+    myfunc();
+}
diff --git a/scripts/developer/tests/unit_tests/moduleUnitTests.js b/scripts/developer/tests/unit_tests/moduleUnitTests.js
new file mode 100644
index 0000000000..6810dd8b6d
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/moduleUnitTests.js
@@ -0,0 +1,378 @@
+/* eslint-env jasmine, node */
+/* global print:true, Script:true, global:true, require:true */
+/* eslint-disable comma-dangle */
+var isNode = instrumentTestrunner(),
+    runInterfaceTests = !isNode,
+    runNetworkTests = true;
+
+// describe wrappers (note: `xdescribe` indicates a disabled or "pending" jasmine test)
+var INTERFACE = { describe: runInterfaceTests ? describe : xdescribe },
+    NETWORK = { describe: runNetworkTests ? describe : xdescribe };
+
+describe('require', function() {
+    describe('resolve', function() {
+        it('should resolve relative filenames', function() {
+            var expected = Script.resolvePath('./moduleTests/example.json');
+            expect(require.resolve('./moduleTests/example.json')).toEqual(expected);
+        });
+        describe('exceptions', function() {
+            it('should reject blank "" module identifiers', function() {
+                expect(function() {
+                    require.resolve('');
+                }).toThrowError(/Cannot find/);
+            });
+            it('should reject excessive identifier sizes', function() {
+                expect(function() {
+                    require.resolve(new Array(8193).toString());
+                }).toThrowError(/Cannot find/);
+            });
+            it('should reject implicitly-relative filenames', function() {
+                expect(function() {
+                    var mod = require.resolve('example.js');
+                    mod.exists;
+                }).toThrowError(/Cannot find/);
+            });
+            it('should reject unanchored, existing filenames with advice', function() {
+                expect(function() {
+                    var mod = require.resolve('moduleTests/example.json');
+                    mod.exists;
+                }).toThrowError(/use '.\/moduleTests\/example\.json'/);
+            });
+            it('should reject unanchored, non-existing filenames', function() {
+                expect(function() {
+                    var mod = require.resolve('asdfssdf/example.json');
+                    mod.exists;
+                }).toThrowError(/Cannot find.*system module not found/);
+            });
+            it('should reject non-existent filenames', function() {
+                expect(function() {
+                    require.resolve('./404error.js');
+                }).toThrowError(/Cannot find/);
+            });
+            it('should reject identifiers resolving to a directory', function() {
+                expect(function() {
+                    var mod = require.resolve('.');
+                    mod.exists;
+                    // console.warn('resolved(.)', mod);
+                }).toThrowError(/Cannot find/);
+                expect(function() {
+                    var mod = require.resolve('..');
+                    mod.exists;
+                    // console.warn('resolved(..)', mod);
+                }).toThrowError(/Cannot find/);
+                expect(function() {
+                    var mod = require.resolve('../');
+                    mod.exists;
+                    // console.warn('resolved(../)', mod);
+                }).toThrowError(/Cannot find/);
+            });
+            (isNode ? xit : it)('should reject non-system, extensionless identifiers', function() {
+                expect(function() {
+                    require.resolve('./example');
+                }).toThrowError(/Cannot find/);
+            });
+        });
+    });
+
+    describe('JSON', function() {
+        it('should import .json modules', function() {
+            var example = require('./moduleTests/example.json');
+            expect(example.name).toEqual('Example JSON Module');
+        });
+        // noet: support for loading JSON via content type workarounds reverted
+        // (leaving these tests intact in case ever revisited later)
+        // INTERFACE.describe('interface', function() {
+        //     NETWORK.describe('network', function() {
+        //         xit('should import #content-type=application/json modules', function() {
+        //             var results = require('https://jsonip.com#content-type=application/json');
+        //             expect(results.ip).toMatch(/^[.0-9]+$/);
+        //         });
+        //         xit('should import content-type: application/json modules', function() {
+        //             var scope = { 'content-type': 'application/json' };
+        //             var results = require.call(scope, 'https://jsonip.com');
+        //             expect(results.ip).toMatch(/^[.0-9]+$/);
+        //         });
+        //     });
+        // });
+
+    });
+
+    INTERFACE.describe('system', function() {
+        it('require("vec3")', function() {
+            expect(require('vec3')).toEqual(jasmine.any(Function));
+        });
+        it('require("vec3").method', function() {
+            expect(require('vec3')().isValid).toEqual(jasmine.any(Function));
+        });
+        it('require("vec3") as constructor', function() {
+            var vec3 = require('vec3');
+            var v = vec3(1.1, 2.2, 3.3);
+            expect(v).toEqual(jasmine.any(Object));
+            expect(v.isValid).toEqual(jasmine.any(Function));
+            expect(v.isValid()).toBe(true);
+            expect(v.toString()).toEqual('[Vec3 (1.100,2.200,3.300)]');
+        });
+    });
+
+    describe('cache', function() {
+        it('should cache modules by resolved module id', function() {
+            var value = new Date;
+            var example = require('./moduleTests/example.json');
+            // earmark the module object with a unique value
+            example['.test'] = value;
+            var example2 = require('../../tests/unit_tests/moduleTests/example.json');
+            expect(example2).toBe(example);
+            // verify earmark is still the same after a second require()
+            expect(example2['.test']).toBe(example['.test']);
+        });
+        it('should reload cached modules set to null', function() {
+            var value = new Date;
+            var example = require('./moduleTests/example.json');
+            example['.test'] = value;
+            require.cache[require.resolve('../../tests/unit_tests/moduleTests/example.json')] = null;
+            var example2 = require('../../tests/unit_tests/moduleTests/example.json');
+            // verify the earmark is *not* the same as before
+            expect(example2).not.toBe(example);
+            expect(example2['.test']).not.toBe(example['.test']);
+        });
+        it('should reload when module property is deleted', function() {
+            var value = new Date;
+            var example = require('./moduleTests/example.json');
+            example['.test'] = value;
+            delete require.cache[require.resolve('../../tests/unit_tests/moduleTests/example.json')];
+            var example2 = require('../../tests/unit_tests/moduleTests/example.json');
+            // verify the earmark is *not* the same as before
+            expect(example2).not.toBe(example);
+            expect(example2['.test']).not.toBe(example['.test']);
+        });
+    });
+
+    describe('cyclic dependencies', function() {
+        describe('should allow lazy-ref cyclic module resolution', function() {
+            var main;
+            beforeEach(function() {
+                // eslint-disable-next-line
+                try { this._print = print; } catch (e) {}
+                // during these tests print() is no-op'd so that it doesn't disrupt the reporter output
+                print = function() {};
+                Script.resetModuleCache();
+            });
+            afterEach(function() {
+                print = this._print;
+            });
+            it('main is requirable', function() {
+                main = require('./moduleTests/cycles/main.js');
+                expect(main).toEqual(jasmine.any(Object));
+            });
+            it('transient a and b done values', function() {
+                expect(main.a['b.done?']).toBe(true);
+                expect(main.b['a.done?']).toBe(false);
+            });
+            it('ultimate a.done?', function() {
+                expect(main['a.done?']).toBe(true);
+            });
+            it('ultimate b.done?', function() {
+                expect(main['b.done?']).toBe(true);
+            });
+        });
+    });
+
+    describe('JS', function() {
+        it('should throw catchable local file errors', function() {
+            expect(function() {
+                require('file:///dev/null/non-existent-file.js');
+            }).toThrowError(/path not found|Cannot find.*non-existent-file/);
+        });
+        it('should throw catchable invalid id errors', function() {
+            expect(function() {
+                require(new Array(4096 * 2).toString());
+            }).toThrowError(/invalid.*size|Cannot find.*,{30}/);
+        });
+        it('should throw catchable unresolved id errors', function() {
+            expect(function() {
+                require('foobar:/baz.js');
+            }).toThrowError(/could not resolve|Cannot find.*foobar:/);
+        });
+
+        NETWORK.describe('network', function() {
+            // note: depending on retries these tests can take up to 60 seconds each to timeout
+            var timeout = 75 * 1000;
+            it('should throw catchable host errors', function() {
+                expect(function() {
+                    var mod = require('http://non.existent.highfidelity.io/moduleUnitTest.js');
+                    print("mod", Object.keys(mod));
+                }).toThrowError(/error retrieving script .ServerUnavailable.|Cannot find.*non.existent/);
+            }, timeout);
+            it('should throw catchable network timeouts', function() {
+                expect(function() {
+                    require('http://ping.highfidelity.io:1024');
+                }).toThrowError(/error retrieving script .Timeout.|Cannot find.*ping.highfidelity/);
+            }, timeout);
+        });
+    });
+
+    INTERFACE.describe('entity', function() {
+        var sampleScripts = [
+            'entityConstructorAPIException.js',
+            'entityConstructorModule.js',
+            'entityConstructorNested2.js',
+            'entityConstructorNested.js',
+            'entityConstructorRequireException.js',
+            'entityPreloadAPIError.js',
+            'entityPreloadRequire.js',
+        ].filter(Boolean).map(function(id) {
+            return Script.require.resolve('./moduleTests/entity/'+id);
+        });
+
+        var uuids = [];
+        function cleanup() {
+            uuids.splice(0,uuids.length).forEach(function(uuid) {
+                Entities.deleteEntity(uuid);
+            });
+        }
+        afterAll(cleanup);
+        // extra sanity check to avoid lingering entities
+        Script.scriptEnding.connect(cleanup);
+
+        for (var i=0; i < sampleScripts.length; i++) {
+            maketest(i);
+        }
+
+        function maketest(i) {
+            var script = sampleScripts[ i % sampleScripts.length ];
+            var shortname = '['+i+'] ' + script.split('/').pop();
+            var position = MyAvatar.position;
+            position.y -= i/2;
+            // define a unique jasmine test for the current entity script
+            it(shortname, function(done) {
+                var uuid = Entities.addEntity({
+                    text: shortname,
+                    description: Script.resolvePath('').split('/').pop(),
+                    type: 'Text',
+                    position: position,
+                    rotation: MyAvatar.orientation,
+                    script: script,
+                    scriptTimestamp: +new Date,
+                    lifetime: 20,
+                    lineHeight: 1/8,
+                    dimensions: { x: 2, y: 0.5, z: 0.01 },
+                    backgroundColor: { red: 0, green: 0, blue: 0 },
+                    color: { red: 0xff, green: 0xff, blue: 0xff },
+                }, !Entities.serversExist() || !Entities.canRezTmp());
+                uuids.push(uuid);
+                function stopChecking() {
+                    if (ii) {
+                        Script.clearInterval(ii);
+                        ii = 0;
+                    }
+                }
+                var ii = Script.setInterval(function() {
+                    Entities.queryPropertyMetadata(uuid, "script", function(err, result) {
+                        if (err) {
+                            stopChecking();
+                            throw new Error(err);
+                        }
+                        if (result.success) {
+                            stopChecking();
+                            if (/Exception/.test(script)) {
+                                expect(result.status).toMatch(/^error_(loading|running)_script$/);
+                            } else {
+                                expect(result.status).toEqual("running");
+                            }
+                            Entities.deleteEntity(uuid);
+                            done();
+                        } else {
+                            print('!result.success', JSON.stringify(result));
+                        }
+                    });
+                }, 100);
+                Script.setTimeout(stopChecking, 4900);
+            }, 5000 /* jasmine async timeout */);
+        }
+    });
+});
+
+// support for isomorphic Node.js / Interface unit testing
+// note: run `npm install` from unit_tests/ and then `node moduleUnitTests.js`
+function run() {}
+function instrumentTestrunner() {
+    var isNode = typeof process === 'object' && process.title === 'node';
+    if (typeof describe === 'function') {
+        // already running within a test runner; assume jasmine is ready-to-go
+        return isNode;
+    }
+    if (isNode) {
+        /* eslint-disable no-console */
+        // Node.js test mode
+        // to keep things consistent Node.js uses the local jasmine.js library (instead of an npm version)
+        var jasmineRequire = require('../../libraries/jasmine/jasmine.js');
+        var jasmine = jasmineRequire.core(jasmineRequire);
+        var env = jasmine.getEnv();
+        var jasmineInterface = jasmineRequire.interface(jasmine, env);
+        for (var p in jasmineInterface) {
+            global[p] = jasmineInterface[p];
+        }
+        env.addReporter(new (require('jasmine-console-reporter')));
+        // testing mocks
+        Script = {
+            resetModuleCache: function() {
+                module.require.cache = {};
+            },
+            setTimeout: setTimeout,
+            clearTimeout: clearTimeout,
+            resolvePath: function(id) {
+                // this attempts to accurately emulate how Script.resolvePath works
+                var trace = {}; Error.captureStackTrace(trace);
+                var base = trace.stack.split('\n')[2].replace(/^.*[(]|[)].*$/g,'').replace(/:[0-9]+:[0-9]+.*$/,'');
+                if (!id) {
+                    return base;
+                }
+                var rel = base.replace(/[^\/]+$/, id);
+                console.info('rel', rel);
+                return require.resolve(rel);
+            },
+            require: function(mod) {
+                return require(Script.require.resolve(mod));
+            },
+        };
+        Script.require.cache = require.cache;
+        Script.require.resolve = function(mod) {
+            if (mod === '.' || /^\.\.($|\/)/.test(mod)) {
+                throw new Error("Cannot find module '"+mod+"' (is dir)");
+            }
+            var path = require.resolve(mod);
+            // console.info('node-require-reoslved', mod, path);
+            try {
+                if (require('fs').lstatSync(path).isDirectory()) {
+                    throw new Error("Cannot find module '"+path+"' (is directory)");
+                }
+                // console.info('!path', path);
+            } catch (e) {
+                console.error(e);
+            }
+            return path;
+        };
+        print = console.info.bind(console, '[print]');
+        /* eslint-enable no-console */
+    } else {
+        // Interface test mode
+        global = this;
+        Script.require('../../../system/libraries/utils.js');
+        this.jasmineRequire = Script.require('../../libraries/jasmine/jasmine.js');
+        Script.require('../../libraries/jasmine/hifi-boot.js');
+        require = Script.require;
+        // polyfill console
+        /* global console:true */
+        console = {
+            log: print,
+            info: print.bind(this, '[info]'),
+            warn: print.bind(this, '[warn]'),
+            error: print.bind(this, '[error]'),
+            debug: print.bind(this, '[debug]'),
+        };
+    }
+    // eslint-disable-next-line
+    run = function() { global.jasmine.getEnv().execute(); };
+    return isNode;
+}
+run();
diff --git a/scripts/developer/tests/unit_tests/package.json b/scripts/developer/tests/unit_tests/package.json
new file mode 100644
index 0000000000..91d719b687
--- /dev/null
+++ b/scripts/developer/tests/unit_tests/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "unit_tests",
+  "devDependencies": {
+    "jasmine-console-reporter": "^1.2.7"
+  }
+}
diff --git a/scripts/developer/tests/unit_tests/scriptUnitTests.js b/scripts/developer/tests/unit_tests/scriptUnitTests.js
index 63b451e97f..fa8cb44608 100644
--- a/scripts/developer/tests/unit_tests/scriptUnitTests.js
+++ b/scripts/developer/tests/unit_tests/scriptUnitTests.js
@@ -15,10 +15,20 @@ describe('Script', function () {
     // characterization tests
     // initially these are just to capture how the app works currently
     var testCases = {
+        // special relative resolves
                                 '': filename,
                                '.': dirname,
                               '..': parentdir,
+
+        // local file "magic" tilde path expansion
+            '/~/defaultScripts.js': ScriptDiscoveryService.defaultScriptsPath + '/defaultScripts.js',
+
+        // these schemes appear to always get resolved to empty URLs
+                      'qrc://test': '',
                 'about:Entities 1': '',
+            'ftp://host:port/path': '',
+         'data:text/html;text,foo': '',
+
                       'Entities 1': dirname + 'Entities 1',
                        './file.js': dirname + 'file.js',
                         'c:/temp/': 'file:///c:/temp/',
@@ -31,6 +41,12 @@ describe('Script', function () {
            '/~/libraries/utils.js': 'file:///~/libraries/utils.js',
                    '/temp/file.js': 'file:///temp/file.js',
                              '/~/': 'file:///~/',
+
+        // these schemes appear to always get resolved to the same URL again
+         'http://highfidelity.com': 'http://highfidelity.com',
+               'atp:/highfidelity': 'atp:/highfidelity',
+        'atp:c2d7e3a48cadf9ba75e4f8d9f4d80e75276774880405a093fdee36543aa04f':
+          'atp:c2d7e3a48cadf9ba75e4f8d9f4d80e75276774880405a093fdee36543aa04f',
     };
     describe('resolvePath', function () {
         Object.keys(testCases).forEach(function(input) {
@@ -42,7 +58,7 @@ describe('Script', function () {
 
     describe('include', function () {
         var old_cache_buster;
-        var cache_buster = '#' + +new Date;
+        var cache_buster = '#' + new Date().getTime().toString(36);
         beforeAll(function() {
             old_cache_buster = Settings.getValue('cache_buster');
             Settings.setValue('cache_buster', cache_buster);
diff --git a/scripts/developer/utilities/render/deferredLighting.qml b/scripts/developer/utilities/render/deferredLighting.qml
index 99a9f258e3..c7ec8e1153 100644
--- a/scripts/developer/utilities/render/deferredLighting.qml
+++ b/scripts/developer/utilities/render/deferredLighting.qml
@@ -25,7 +25,7 @@ Column {
                      "Lightmap:LightingModel:enableLightmap",
                      "Background:LightingModel:enableBackground",                      
                      "ssao:AmbientOcclusion:enabled",                      
-                     "Textures:LightingModel:enableMaterialTexturing",                      
+                     "Textures:LightingModel:enableMaterialTexturing"                     
                 ]
                 CheckBox {
                     text: modelData.split(":")[0]
@@ -45,6 +45,7 @@ Column {
                      "Diffuse:LightingModel:enableDiffuse",
                      "Specular:LightingModel:enableSpecular",
                      "Albedo:LightingModel:enableAlbedo",
+                     "Wireframe:LightingModel:enableWireframe"
                 ]
                 CheckBox {
                     text: modelData.split(":")[0]
diff --git a/scripts/modules/vec3.js b/scripts/modules/vec3.js
new file mode 100644
index 0000000000..f164f01374
--- /dev/null
+++ b/scripts/modules/vec3.js
@@ -0,0 +1,69 @@
+// Example of using a "system module" to decouple Vec3's implementation details.
+//
+// Users would bring Vec3 support in as a module:
+//   var vec3 = Script.require('vec3');
+//
+
+// (this example is compatible with using as a Script.include and as a Script.require module)
+try {
+    // Script.require
+    module.exports = vec3;
+} catch(e) {
+    // Script.include
+    Script.registerValue("vec3", vec3);
+}
+
+vec3.fromObject = function(v) {
+    //return new vec3(v.x, v.y, v.z);
+    //... this is even faster and achieves the same effect
+    v.__proto__ = vec3.prototype;
+    return v;
+};
+
+vec3.prototype = {
+    multiply: function(v2) {
+        // later on could support overrides like so:
+        //     if (v2 instanceof quat) { [...] }
+        // which of the below is faster (C++ or JS)?
+        // (dunno -- but could systematically find out and go with that version)
+
+        // pure JS option
+        // return new vec3(this.x * v2.x, this.y * v2.y, this.z * v2.z);
+
+        // hybrid C++ option
+        return vec3.fromObject(Vec3.multiply(this, v2));
+    },
+    // detects any NaN and Infinity values
+    isValid: function() {
+        return isFinite(this.x) && isFinite(this.y) && isFinite(this.z);
+    },
+    // format Vec3's, eg:
+    //     var v = vec3();
+    //     print(v); // outputs [Vec3 (0.000, 0.000, 0.000)]
+    toString: function() {
+        if (this === vec3.prototype) {
+            return "{Vec3 prototype}";
+        }
+        function fixed(n) { return n.toFixed(3); }
+        return "[Vec3 (" + [this.x, this.y, this.z].map(fixed) + ")]";
+    },
+};
+
+vec3.DEBUG = true;
+
+function vec3(x, y, z) {
+    if (!(this instanceof vec3)) {
+        // if vec3 is called as a function then re-invoke as a constructor
+        // (so that `value instanceof vec3` holds true for created values)
+        return new vec3(x, y, z);
+    }
+
+    // unfold default arguments (vec3(), vec3(.5), vec3(0,1), etc.)
+    this.x = x !== undefined ? x : 0;
+    this.y = y !== undefined ? y : this.x;
+    this.z = z !== undefined ? z : this.y;
+
+    if (vec3.DEBUG && !this.isValid())
+        throw new Error('vec3() -- invalid initial values ['+[].slice.call(arguments)+']');
+};
+
diff --git a/scripts/tutorials/entity_scripts/sit.js b/scripts/tutorials/entity_scripts/sit.js
index ffce196572..82afdc8974 100644
--- a/scripts/tutorials/entity_scripts/sit.js
+++ b/scripts/tutorials/entity_scripts/sit.js
@@ -6,26 +6,35 @@
     var ANIMATION_FPS = 30;
     var ANIMATION_FIRST_FRAME = 1;
     var ANIMATION_LAST_FRAME = 10;
-    var RELEASE_KEYS = ['w', 'a', 's', 'd', 'UP', 'LEFT', 'DOWN', 'RIGHT'];
     var RELEASE_TIME = 500; // ms
     var RELEASE_DISTANCE = 0.2; // meters
     var MAX_IK_ERROR = 30;
+    var IK_SETTLE_TIME = 250; // ms
     var DESKTOP_UI_CHECK_INTERVAL = 100;
     var DESKTOP_MAX_DISTANCE = 5;
-    var SIT_DELAY = 25
-    var MAX_RESET_DISTANCE = 0.5
+    var SIT_DELAY = 25;
+    var MAX_RESET_DISTANCE = 0.5; // meters
+    var OVERRIDEN_DRIVE_KEYS = [
+        DriveKeys.TRANSLATE_X,
+        DriveKeys.TRANSLATE_Y,
+        DriveKeys.TRANSLATE_Z,
+        DriveKeys.STEP_TRANSLATE_X,
+        DriveKeys.STEP_TRANSLATE_Y,
+        DriveKeys.STEP_TRANSLATE_Z,
+    ];
 
     this.entityID = null;
-    this.timers = {};
     this.animStateHandlerID = null;
     this.interval = null;
+    this.sitDownSettlePeriod = null;
+    this.lastTimeNoDriveKeys = null;
 
     this.preload = function(entityID) {
         this.entityID = entityID;
     }
     this.unload = function() {
         if (Settings.getValue(SETTING_KEY) === this.entityID) {
-            this.sitUp();
+            this.standUp();
         }
         if (this.interval !== null) {
             Script.clearInterval(this.interval);
@@ -96,6 +105,11 @@
             print("Someone is already sitting in that chair.");
             return;
         }
+        print("Sitting down (" + this.entityID + ")");
+
+        var now = Date.now();
+        this.sitDownSettlePeriod = now + IK_SETTLE_TIME;
+        this.lastTimeNoDriveKeys = now;
 
         var previousValue = Settings.getValue(SETTING_KEY);
         Settings.setValue(SETTING_KEY, this.entityID);
@@ -118,20 +132,17 @@
             return { headType: 0 };
         }, ["headType"]);
         Script.update.connect(this, this.update);
-        Controller.keyPressEvent.connect(this, this.keyPressed);
-        Controller.keyReleaseEvent.connect(this, this.keyReleased);
-        for (var i in RELEASE_KEYS) {
-            Controller.captureKeyEvents({ text: RELEASE_KEYS[i] });
+        for (var i in OVERRIDEN_DRIVE_KEYS) {
+            MyAvatar.disableDriveKey(OVERRIDEN_DRIVE_KEYS[i]);
         }
     }
 
-    this.sitUp = function() {
+    this.standUp = function() {
+        print("Standing up (" + this.entityID + ")");
         MyAvatar.removeAnimationStateHandler(this.animStateHandlerID);
         Script.update.disconnect(this, this.update);
-        Controller.keyPressEvent.disconnect(this, this.keyPressed);
-        Controller.keyReleaseEvent.disconnect(this, this.keyReleased);
-        for (var i in RELEASE_KEYS) {
-            Controller.releaseKeyEvents({ text: RELEASE_KEYS[i] });
+        for (var i in OVERRIDEN_DRIVE_KEYS) {
+            MyAvatar.enableDriveKey(OVERRIDEN_DRIVE_KEYS[i]);
         }
 
         this.setSeatUser(null);
@@ -156,6 +167,7 @@
         }
     }
 
+    // function called by teleport.js if it detects the appropriate userData
     this.sit = function () {
         this.sitDown();
     }
@@ -207,7 +219,33 @@
             var properties = Entities.getEntityProperties(this.entityID);
             var avatarDistance = Vec3.distance(MyAvatar.position, properties.position);
             var ikError = MyAvatar.getIKErrorOnLastSolve();
-            if (avatarDistance > RELEASE_DISTANCE || ikError > MAX_IK_ERROR) {
+            var now = Date.now();
+            var shouldStandUp = false;
+
+            // Check if a drive key is pressed
+            var hasActiveDriveKey = false;
+            for (var i in OVERRIDEN_DRIVE_KEYS) {
+                if (MyAvatar.getRawDriveKey(OVERRIDEN_DRIVE_KEYS[i]) != 0.0) {
+                    hasActiveDriveKey = true;
+                    break;
+                }
+            }
+
+            // Only standup if user has been pushing a drive key for RELEASE_TIME
+            if (hasActiveDriveKey) {
+                var elapsed = now - this.lastTimeNoDriveKeys;
+                shouldStandUp = elapsed > RELEASE_TIME;
+            } else {
+                this.lastTimeNoDriveKeys = Date.now();
+            }
+
+            // Allow some time for the IK to settle
+            if (ikError > MAX_IK_ERROR && now > this.sitDownSettlePeriod) {
+                shouldStandUp = true;
+            }
+
+
+            if (shouldStandUp || avatarDistance > RELEASE_DISTANCE) {
                 print("IK error: " + ikError + ", distance from chair: " + avatarDistance);
 
                 // Move avatar in front of the chair to avoid getting stuck in collision hulls
@@ -215,45 +253,13 @@
                     var offset = { x: 0, y: 1.0, z: -0.5 - properties.dimensions.z * properties.registrationPoint.z };
                     var position = Vec3.sum(properties.position, Vec3.multiplyQbyV(properties.rotation, offset));
                     MyAvatar.position = position;
+                    print("Moving Avatar in front of the chair.")
                 }
 
-                this.sitUp();
+                this.standUp();
             }
         }
     }
-    this.keyPressed = function(event) {
-        if (isInEditMode()) {
-            return;
-        }
-
-        if (RELEASE_KEYS.indexOf(event.text) !== -1) {
-            var that = this;
-            this.timers[event.text] = Script.setTimeout(function() {
-                delete that.timers[event.text];
-
-                var properties = Entities.getEntityProperties(that.entityID);
-                var avatarDistance = Vec3.distance(MyAvatar.position, properties.position);
-
-                // Move avatar in front of the chair to avoid getting stuck in collision hulls
-                if (avatarDistance < MAX_RESET_DISTANCE) {
-                    var offset = { x: 0, y: 1.0, z: -0.5 - properties.dimensions.z * properties.registrationPoint.z };
-                    var position = Vec3.sum(properties.position, Vec3.multiplyQbyV(properties.rotation, offset));
-                    MyAvatar.position = position;
-                }
-
-                that.sitUp();
-            }, RELEASE_TIME);
-        }
-    }
-    this.keyReleased = function(event) {
-        if (RELEASE_KEYS.indexOf(event.text) !== -1) {
-            if (this.timers[event.text]) {
-                Script.clearTimeout(this.timers[event.text]);
-                delete this.timers[event.text];
-            }
-        }
-    }
-
     this.canSitDesktop = function() {
         var properties = Entities.getEntityProperties(this.entityID, ["position"]);
         var distanceFromSeat = Vec3.distance(MyAvatar.position, properties.position);