diff --git a/assignment-client/src/entities/EntityServer.cpp b/assignment-client/src/entities/EntityServer.cpp
index b6223497e6..b177d2a9a0 100644
--- a/assignment-client/src/entities/EntityServer.cpp
+++ b/assignment-client/src/entities/EntityServer.cpp
@@ -277,14 +277,17 @@ void EntityServer::readAdditionalConfiguration(const QJsonObject& settingsSectio
 // set of stats to have, but we'd probably want a different data structure if we keep it very long.
 // Since this version uses a single shared QMap for all senders, there could be some lock contention 
 // on this QWriteLocker
-void EntityServer::trackSend(const QUuid& dataID, quint64 dataLastEdited, const QUuid& viewerNode) {
+void EntityServer::trackSend(const QUuid& dataID, quint64 dataLastEdited, const QUuid& sessionID) {
     QWriteLocker locker(&_viewerSendingStatsLock);
-    _viewerSendingStats[viewerNode][dataID] = { usecTimestampNow(), dataLastEdited };
+    _viewerSendingStats[sessionID][dataID] = { usecTimestampNow(), dataLastEdited };
 }
 
-void EntityServer::trackViewerGone(const QUuid& viewerNode) {
+void EntityServer::trackViewerGone(const QUuid& sessionID) {
     QWriteLocker locker(&_viewerSendingStatsLock);
-    _viewerSendingStats.remove(viewerNode);
+    _viewerSendingStats.remove(sessionID);
+    if (_entitySimulation) {
+        _entitySimulation->clearOwnership(sessionID);
+    }
 }
 
 QString EntityServer::serverSubclassStats() {
diff --git a/assignment-client/src/entities/EntityServer.h b/assignment-client/src/entities/EntityServer.h
index cd603f44d8..74057bfa5d 100644
--- a/assignment-client/src/entities/EntityServer.h
+++ b/assignment-client/src/entities/EntityServer.h
@@ -27,6 +27,8 @@ struct ViewerSendingStats {
     quint64 lastEdited;
 };
 
+class SimpleEntitySimulation;
+
 class EntityServer : public OctreeServer, public NewlyCreatedEntityHook {
     Q_OBJECT
 public:
@@ -52,8 +54,8 @@ public:
     virtual void readAdditionalConfiguration(const QJsonObject& settingsSectionObject) override;
     virtual QString serverSubclassStats() override;
 
-    virtual void trackSend(const QUuid& dataID, quint64 dataLastEdited, const QUuid& viewerNode) override;
-    virtual void trackViewerGone(const QUuid& viewerNode) override;
+    virtual void trackSend(const QUuid& dataID, quint64 dataLastEdited, const QUuid& sessionID) override;
+    virtual void trackViewerGone(const QUuid& sessionID) override;
 
 public slots:
     void pruneDeletedEntities();
@@ -65,7 +67,7 @@ private slots:
     void handleEntityPacket(QSharedPointer<ReceivedMessage> message, SharedNodePointer senderNode);
 
 private:
-    EntitySimulation* _entitySimulation;
+    SimpleEntitySimulation* _entitySimulation;
     QTimer* _pruneDeletedEntitiesTimer = nullptr;
 
     QReadWriteLock _viewerSendingStatsLock;
diff --git a/examples/controllers/handControllerGrab.js b/examples/controllers/handControllerGrab.js
index 04e93334cb..2bddc5d677 100644
--- a/examples/controllers/handControllerGrab.js
+++ b/examples/controllers/handControllerGrab.js
@@ -1,3 +1,4 @@
+"use strict";
 //  handControllerGrab.js
 //
 //  Created by Eric Levin on  9/2/15
@@ -801,6 +802,8 @@ function MyController(hand) {
         this.isInitialGrab = false;
         this.doubleParentGrab = false;
 
+        this.checkForStrayChildren();
+
         if (this.state == STATE_SEARCHING ? this.triggerSmoothedReleased() : this.bumperReleased()) {
             this.setState(STATE_RELEASE);
             return;
@@ -1444,6 +1447,13 @@ function MyController(hand) {
         this.heartBeat(this.grabbedEntity);
 
         var props = Entities.getEntityProperties(this.grabbedEntity, ["localPosition", "parentID", "position"]);
+        if (!props.position) {
+            // server may have reset, taking our equipped entity with it.  move back to "off" stte
+            this.setState(STATE_RELEASE);
+            this.callEntityMethodOnGrabbed("releaseGrab");
+            return;
+        }
+
         if (props.parentID == MyAvatar.sessionUUID &&
             Vec3.length(props.localPosition) > NEAR_PICK_MAX_DISTANCE * 2.0) {
             // for whatever reason, the held/equipped entity has been pulled away.  ungrab or unequip.
@@ -1751,6 +1761,17 @@ function MyController(hand) {
         return data;
     };
 
+    this.checkForStrayChildren = function() {
+        // sometimes things can get parented to a hand and this script is unaware.  Search for such entities and
+        // unhook them.
+        var handJointIndex = MyAvatar.getJointIndex(this.hand === RIGHT_HAND ? "RightHand" : "LeftHand");
+        var children = Entities.getChildrenIDsOfJoint(MyAvatar.sessionUUID, handJointIndex);
+        children.forEach(function(childID) {
+            print("disconnecting stray child of hand: (" + _this.hand + ") " + childID);
+            Entities.editEntity(childID, {parentID: NULL_UUID});
+        });
+    }
+
     this.deactivateEntity = function(entityID, noVelocity) {
         var data = getEntityCustomData(GRAB_USER_DATA_KEY, entityID, {});
         if (data && data["refCount"]) {
diff --git a/examples/depthReticle.js b/examples/depthReticle.js
index a60e61d07c..4b649f49b6 100644
--- a/examples/depthReticle.js
+++ b/examples/depthReticle.js
@@ -12,17 +12,23 @@
 
 var APPARENT_2D_OVERLAY_DEPTH = 1.0;
 var APPARENT_MAXIMUM_DEPTH = 100.0; // this is a depth at which things all seem sufficiently distant
-var lastDepthCheckTime = 0;
+var lastDepthCheckTime = Date.now();
+var desiredDepth = APPARENT_2D_OVERLAY_DEPTH;
+var TIME_BETWEEN_DEPTH_CHECKS = 100;
+var MINIMUM_DEPTH_ADJUST = 0.01;
+var NON_LINEAR_DIVISOR = 2;
 
 Script.update.connect(function(deltaTime) {
-    var TIME_BETWEEN_DEPTH_CHECKS = 100;
-    var timeSinceLastDepthCheck = Date.now() - lastDepthCheckTime;
+    var now = Date.now();
+    var timeSinceLastDepthCheck = now - lastDepthCheckTime;
     if (timeSinceLastDepthCheck > TIME_BETWEEN_DEPTH_CHECKS) {
+        var newDesiredDepth = desiredDepth;
+        lastDepthCheckTime = now;
         var reticlePosition = Reticle.position;
 
         // first check the 2D Overlays
         if (Reticle.pointingAtSystemOverlay || Overlays.getOverlayAtPoint(reticlePosition)) {
-            Reticle.setDepth(APPARENT_2D_OVERLAY_DEPTH);
+            newDesiredDepth = APPARENT_2D_OVERLAY_DEPTH;
         } else {
             var pickRay = Camera.computePickRay(reticlePosition.x, reticlePosition.y);
 
@@ -37,11 +43,30 @@ Script.update.connect(function(deltaTime) {
             // If either the overlays or entities intersect, then set the reticle depth to 
             // the distance of intersection
             if (result.intersects) {
-                Reticle.setDepth(result.distance);
+                newDesiredDepth = result.distance;
             } else {
                 // if nothing intersects... set the depth to some sufficiently large depth
-                Reticle.setDepth(APPARENT_MAXIMUM_DEPTH);
+                newDesiredDepth = APPARENT_MAXIMUM_DEPTH;
             }
         }
+
+        // If the desired depth has changed, reset our fade start time
+        if (desiredDepth != newDesiredDepth) {
+            desiredDepth = newDesiredDepth;
+        }
+    }
+
+    // move the reticle toward the desired depth
+    if (desiredDepth != Reticle.depth) {
+
+        // cut distance between desiredDepth and current depth in half until we're close enough
+        var distanceToAdjustThisCycle = (desiredDepth - Reticle.depth) / NON_LINEAR_DIVISOR;
+        if (Math.abs(distanceToAdjustThisCycle) < MINIMUM_DEPTH_ADJUST) {
+            newDepth = desiredDepth;
+        } else {
+            newDepth = Reticle.depth + distanceToAdjustThisCycle;
+        }
+
+        Reticle.setDepth(newDepth);
     }
 });
diff --git a/examples/edit.js b/examples/edit.js
index 50a66ea31f..59e1f74d20 100644
--- a/examples/edit.js
+++ b/examples/edit.js
@@ -711,13 +711,32 @@ var intersection;
 
 var SCALE_FACTOR = 200.0;
 
-function rayPlaneIntersection(pickRay, point, normal) {
+function rayPlaneIntersection(pickRay, point, normal) {    //
+    //
+    //  This version of the test returns the intersection of a line with a plane
+    //
+    var collides = Vec3.dot(pickRay.direction, normal);
+
     var d = -Vec3.dot(point, normal);
-    var t = -(Vec3.dot(pickRay.origin, normal) + d) / Vec3.dot(pickRay.direction, normal);
+    var t = -(Vec3.dot(pickRay.origin, normal) + d) / collides;
 
     return Vec3.sum(pickRay.origin, Vec3.multiply(pickRay.direction, t));
 }
 
+function rayPlaneIntersection2(pickRay, point, normal) {
+    //
+    //  This version of the test returns false if the ray is directed away from the plane
+    //
+    var collides = Vec3.dot(pickRay.direction, normal);
+    var d = -Vec3.dot(point, normal);
+    var t = -(Vec3.dot(pickRay.origin, normal) + d) / collides;
+    if (t < 0.0) {
+        return false;
+    } else {
+        return Vec3.sum(pickRay.origin, Vec3.multiply(pickRay.direction, t));
+    }
+}
+
 function findClickedEntity(event) {
     var pickZones = event.isControl;
 
@@ -758,7 +777,8 @@ function findClickedEntity(event) {
     var foundEntity = result.entityID;
     return {
         pickRay: pickRay,
-        entityID: foundEntity
+        entityID: foundEntity,
+        intersection: result.intersection
     };
 }
 
@@ -926,6 +946,7 @@ function mouseReleaseEvent(event) {
 }
 
 function mouseClickEvent(event) {
+    var wantDebug = false;
     if (isActive && event.isLeftButton) {
         var result = findClickedEntity(event);
         if (result === null) {
@@ -940,11 +961,15 @@ function mouseClickEvent(event) {
 
         var properties = Entities.getEntityProperties(foundEntity);
         if (isLocked(properties)) {
-            print("Model locked " + properties.id);
+            if (wantDebug) {
+                print("Model locked " + properties.id);
+            }
         } else {
             var halfDiagonal = Vec3.length(properties.dimensions) / 2.0;
 
-            print("Checking properties: " + properties.id + " " + " - Half Diagonal:" + halfDiagonal);
+            if (wantDebug) {
+                print("Checking properties: " + properties.id + " " + " - Half Diagonal:" + halfDiagonal);
+            }
             //                P         P - Model
             //               /|         A - Palm
             //              / | d       B - unit vector toward tip
@@ -981,8 +1006,9 @@ function mouseClickEvent(event) {
                 } else {
                     selectionManager.addEntity(foundEntity, true);
                 }
-
-                print("Model selected: " + foundEntity);
+                if (wantDebug) {
+                    print("Model selected: " + foundEntity);
+                }
                 selectionDisplay.select(selectedEntityID, event);
 
                 if (Menu.isOptionChecked(MENU_AUTO_FOCUS_ON_SELECT)) {
diff --git a/examples/gridTest.js b/examples/gridTest.js
index 0d6040470f..5bbd3246ae 100644
--- a/examples/gridTest.js
+++ b/examples/gridTest.js
@@ -17,8 +17,8 @@ var SIZE = 10.0;
 var SEPARATION = 20.0;
 var ROWS_X = 30; 
 var ROWS_Z = 30;
-var TYPE = "Sphere";            //   Right now this can be "Box" or "Model" or "Sphere"
-var MODEL_URL = "https://hifi-public.s3.amazonaws.com/models/props/LowPolyIsland/CypressTreeGroup.fbx";
+var TYPE = "Model";            //   Right now this can be "Box" or "Model" or "Sphere"
+var MODEL_URL = "http://hifi-content.s3.amazonaws.com/DomainContent/CellScience/Instances/vesicle.fbx";
 var MODEL_DIMENSION = { x: 33, y: 16, z: 49 };
 var RATE_PER_SECOND = 1000;    //    The entity server will drop data if we create things too fast.
 var SCRIPT_INTERVAL = 100;
@@ -38,6 +38,7 @@ Script.setInterval(function () {
     var numToCreate = RATE_PER_SECOND * (SCRIPT_INTERVAL / 1000.0);
     for (var i = 0; i < numToCreate; i++) {
         var position = { x: SIZE + (x * SEPARATION), y: SIZE, z: SIZE + (z * SEPARATION) };
+        print('position:'+JSON.stringify(position))
         if (TYPE == "Model") {
             Entities.addEntity({ 
             type: TYPE,
diff --git a/examples/libraries/entitySelectionTool.js b/examples/libraries/entitySelectionTool.js
index c1675ef044..95e695aa9c 100644
--- a/examples/libraries/entitySelectionTool.js
+++ b/examples/libraries/entitySelectionTool.js
@@ -16,6 +16,11 @@ HIFI_PUBLIC_BUCKET = "http://s3.amazonaws.com/hifi-public/";
 SPACE_LOCAL = "local";
 SPACE_WORLD = "world";
 
+function objectTranslationPlanePoint(position, dimensions) {
+    var newPosition = { x: position.x, y: position.y, z: position.z };
+    newPosition.y -= dimensions.y / 2.0;
+    return newPosition;
+}
 
 SelectionManager = (function() {
     var that = {};
@@ -2252,15 +2257,20 @@ SelectionDisplay = (function() {
     var constrainMajorOnly = false;
     var startPosition = null;
     var duplicatedEntityIDs = null;
+
     var translateXZTool = {
         mode: 'TRANSLATE_XZ',
+        pickPlanePosition: { x: 0, y: 0, z: 0 },
+        greatestDimension: 0.0,
+        startingDistance: 0.0,
+        startingElevation: 0.0,
         onBegin: function(event) {
             SelectionManager.saveProperties();
             startPosition = SelectionManager.worldPosition;
             var dimensions = SelectionManager.worldDimensions;
 
             var pickRay = Camera.computePickRay(event.x, event.y);
-            initialXZPick = rayPlaneIntersection(pickRay, startPosition, {
+            initialXZPick = rayPlaneIntersection(pickRay, translateXZTool.pickPlanePosition, {
                 x: 0,
                 y: 1,
                 z: 0
@@ -2297,16 +2307,56 @@ SelectionDisplay = (function() {
                 visible: false
             });
         },
+        elevation: function(origin, intersection) {
+            return (origin.y - intersection.y) / Vec3.distance(origin, intersection);
+        },
         onMove: function(event) {
+            var wantDebug = false;
             pickRay = Camera.computePickRay(event.x, event.y);
 
-            var pick = rayPlaneIntersection(pickRay, SelectionManager.worldPosition, {
+            var pick = rayPlaneIntersection2(pickRay, translateXZTool.pickPlanePosition, {
                 x: 0,
                 y: 1,
                 z: 0
             });
+
+            // If the pick ray doesn't hit the pick plane in this direction, do nothing.
+            // this will happen when someone drags across the horizon from the side they started on.
+            if (!pick) {
+                if (wantDebug) {
+                    print("Pick ray does not intersect XZ plane.");
+                }
+                return;
+            }
+
             var vector = Vec3.subtract(pick, initialXZPick);
 
+            // If the mouse is too close to the horizon of the pick plane, stop moving
+            var MIN_ELEVATION = 0.02;   //  largest dimension of object divided by distance to it
+            var elevation = translateXZTool.elevation(pickRay.origin, pick);
+            if (wantDebug) {
+                    print("Start Elevation: " + translateXZTool.startingElevation + ", elevation: " + elevation);
+            }
+            if ((translateXZTool.startingElevation > 0.0 && elevation < MIN_ELEVATION) || 
+                (translateXZTool.startingElevation < 0.0 && elevation > -MIN_ELEVATION)) {
+                if (wantDebug) {
+                    print("too close to horizon!");
+                }
+                return;
+            }
+
+            //  If the angular size of the object is too small, stop moving
+            var MIN_ANGULAR_SIZE = 0.01;   //  Radians
+            if (translateXZTool.greatestDimension > 0) {
+                var angularSize = Math.atan(translateXZTool.greatestDimension / Vec3.distance(pickRay.origin, pick));
+                if (wantDebug) {
+                    print("Angular size = " + angularSize);
+                }
+                if (angularSize < MIN_ANGULAR_SIZE) {
+                    return;
+                }
+            }
+
             // If shifted, constrain to one axis
             if (event.isShifted) {
                 if (Math.abs(vector.x) > Math.abs(vector.z)) {
@@ -2368,7 +2418,7 @@ SelectionDisplay = (function() {
                 grid.snapToGrid(Vec3.sum(cornerPosition, vector), constrainMajorOnly),
                 cornerPosition);
 
-            var wantDebug = false;
+
 
             for (var i = 0; i < SelectionManager.selections.length; i++) {
                 var properties = SelectionManager.savedProperties[SelectionManager.selections[i]];
@@ -2645,11 +2695,6 @@ SelectionDisplay = (function() {
                 pickRayPosition,
                 planeNormal);
 
-            // Overlays.editOverlay(normalLine, {
-            //     start: initialPosition,
-            //     end: Vec3.sum(Vec3.multiply(100000, planeNormal), initialPosition),
-            // });
-
             SelectionManager.saveProperties();
         };
 
@@ -3751,7 +3796,7 @@ SelectionDisplay = (function() {
     };
 
     that.mousePressEvent = function(event) {
-
+        var wantDebug = false; 
         if (!event.isLeftButton) {
             // if another mouse button than left is pressed ignore it
             return false;
@@ -3777,7 +3822,7 @@ SelectionDisplay = (function() {
 
         if (result.intersects) {
 
-            var wantDebug = false;
+            
             if (wantDebug) {
                 print("something intersects... ");
                 print("   result.overlayID:" + result.overlayID + "[" + overlayNames[result.overlayID] + "]");
@@ -3874,7 +3919,10 @@ SelectionDisplay = (function() {
 
         if (!somethingClicked) {
 
-            print("rotate handle case...");
+            if (wantDebug) {
+                print("rotate handle case...");
+            }
+            
 
             // After testing our stretch handles, then check out rotate handles
             Overlays.editOverlay(yawHandle, {
@@ -3942,15 +3990,17 @@ SelectionDisplay = (function() {
                         break;
 
                     default:
-                        print("mousePressEvent()...... " + overlayNames[result.overlayID]);
+                        if (wantDebug) {
+                            print("mousePressEvent()...... " + overlayNames[result.overlayID]);
+                        }
                         mode = "UNKNOWN";
                         break;
                 }
             }
-
-            print("    somethingClicked:" + somethingClicked);
-            print("                mode:" + mode);
-
+            if (wantDebug) {
+                print("    somethingClicked:" + somethingClicked);
+                print("                mode:" + mode);
+            }
 
             if (somethingClicked) {
 
@@ -4093,12 +4143,25 @@ SelectionDisplay = (function() {
                 switch (result.overlayID) {
                     case selectionBox:
                         activeTool = translateXZTool;
+                        translateXZTool.pickPlanePosition = result.intersection;
+                        translateXZTool.greatestDimension = Math.max(Math.max(SelectionManager.worldDimensions.x, SelectionManager.worldDimensions.y), 
+                            SelectionManager.worldDimensions.z);
+                        if (wantDebug) {
+                            print("longest dimension: " + translateXZTool.greatestDimension);
+                            translateXZTool.startingDistance = Vec3.distance(pickRay.origin, SelectionManager.position);
+                            print("starting distance: " + translateXZTool.startingDistance);
+                            translateXZTool.startingElevation = translateXZTool.elevation(pickRay.origin, translateXZTool.pickPlanePosition);
+                            print(" starting elevation: " + translateXZTool.startingElevation);
+                        }
+                        
                         mode = translateXZTool.mode;
                         activeTool.onBegin(event);
                         somethingClicked = true;
                         break;
                     default:
-                        print("mousePressEvent()...... " + overlayNames[result.overlayID]);
+                        if (wantDebug) {
+                            print("mousePressEvent()...... " + overlayNames[result.overlayID]);
+                        }
                         mode = "UNKNOWN";
                         break;
                 }
diff --git a/interface/src/avatar/Avatar.cpp b/interface/src/avatar/Avatar.cpp
index 83351d5188..0bd134bef5 100644
--- a/interface/src/avatar/Avatar.cpp
+++ b/interface/src/avatar/Avatar.cpp
@@ -400,7 +400,7 @@ void Avatar::render(RenderArgs* renderArgs, const glm::vec3& cameraPosition) {
         frustum = qApp->getDisplayViewFrustum();
     }
 
-    if (frustum->sphereIntersectsFrustum(getPosition(), boundingRadius)) {
+    if (!frustum->sphereIntersectsFrustum(getPosition(), boundingRadius)) {
         endRender();
         return;
     }
diff --git a/interface/src/avatar/AvatarActionHold.cpp b/interface/src/avatar/AvatarActionHold.cpp
index 5b493c4215..b62cae1d58 100644
--- a/interface/src/avatar/AvatarActionHold.cpp
+++ b/interface/src/avatar/AvatarActionHold.cpp
@@ -153,25 +153,6 @@ std::shared_ptr<Avatar> AvatarActionHold::getTarget(float deltaTimeStep, glm::qu
                 palmPosition = holdingAvatar->getLeftPalmPosition();
                 palmRotation = holdingAvatar->getLeftPalmRotation();
             }
-
-            // In this case we are simulating the grab of another avatar.
-            // Because the hand controller velocity for their palms is not transmitted over the
-            // network, we have to synthesize our own.
-
-            if (_previousSet) {
-                // smooth linear velocity over two frames
-                glm::vec3 positionalDelta = palmPosition - _previousPositionalTarget;
-                linearVelocity = (positionalDelta + _previousPositionalDelta) / (deltaTimeStep + _previousDeltaTimeStep);
-                glm::quat deltaRotation = palmRotation * glm::inverse(_previousRotationalTarget);
-                float rotationAngle = glm::angle(deltaRotation);
-                if (rotationAngle > EPSILON) {
-                    angularVelocity = glm::normalize(glm::axis(deltaRotation));
-                    angularVelocity *= (rotationAngle / deltaTimeStep);
-                }
-
-                _previousPositionalDelta = positionalDelta;
-                _previousDeltaTimeStep = deltaTimeStep;
-            }
         }
 
         rotation = palmRotation * _relativeRotation;
@@ -278,6 +259,7 @@ void AvatarActionHold::doKinematicUpdate(float deltaTimeStep) {
     });
 
     forceBodyNonStatic();
+    activateBody(true);
 }
 
 bool AvatarActionHold::updateArguments(QVariantMap arguments) {
diff --git a/interface/src/ui/ApplicationCompositor.cpp b/interface/src/ui/ApplicationCompositor.cpp
index 99f0b4fdc4..59d794d7cb 100644
--- a/interface/src/ui/ApplicationCompositor.cpp
+++ b/interface/src/ui/ApplicationCompositor.cpp
@@ -301,7 +301,7 @@ void ApplicationCompositor::displayOverlayTextureHmd(RenderArgs* renderArgs, int
                 // look at borrowed from overlays
                 float elevation = -asinf(relativePosition.y / glm::length(relativePosition));
                 float azimuth = atan2f(relativePosition.x, relativePosition.z);
-                glm::quat faceCamera = glm::quat(glm::vec3(elevation, azimuth, 0)) * quat(vec3(0, 0, -1)); // this extra *quat(vec3(0,0,-1)) was required to get the quad to flip this seems like we could optimize
+                glm::quat faceCamera = glm::quat(glm::vec3(elevation, azimuth, 0)) * quat(vec3(0, -PI, 0)); // this extra *quat(vec3(0,-PI,0)) was required to get the quad to flip this seems like we could optimize
 
                 Transform transform;
                 transform.setTranslation(relativePosition);
diff --git a/libraries/entities/src/EntityScriptingInterface.cpp b/libraries/entities/src/EntityScriptingInterface.cpp
index d7a47136b5..26f73eb65a 100644
--- a/libraries/entities/src/EntityScriptingInterface.cpp
+++ b/libraries/entities/src/EntityScriptingInterface.cpp
@@ -12,6 +12,7 @@
 
 #include "EntityItemID.h"
 #include <VariantMapToScriptValue.h>
+#include <SpatialParentFinder.h>
 
 #include "EntitiesLogging.h"
 #include "EntityActionFactoryInterface.h"
@@ -1063,6 +1064,34 @@ QStringList EntityScriptingInterface::getJointNames(const QUuid& entityID) {
     return result;
 }
 
+QVector<QUuid> EntityScriptingInterface::getChildrenIDsOfJoint(const QUuid& parentID, int jointIndex) {
+    QVector<QUuid> result;
+    if (!_entityTree) {
+        return result;
+    }
+    _entityTree->withReadLock([&] {
+        QSharedPointer<SpatialParentFinder> parentFinder = DependencyManager::get<SpatialParentFinder>();
+        if (!parentFinder) {
+            return;
+        }
+        bool success;
+        SpatiallyNestableWeakPointer parentWP = parentFinder->find(parentID, success);
+        if (!success) {
+            return;
+        }
+        SpatiallyNestablePointer parent = parentWP.lock();
+        if (!parent) {
+            return;
+        }
+        parent->forEachChild([&](SpatiallyNestablePointer child) {
+            if (child->getParentJointIndex() == jointIndex) {
+                result.push_back(child->getID());
+            }
+        });
+    });
+    return result;
+}
+
 float EntityScriptingInterface::calculateCost(float mass, float oldVelocity, float newVelocity) {
     return std::abs(mass * (newVelocity - oldVelocity));
 }
diff --git a/libraries/entities/src/EntityScriptingInterface.h b/libraries/entities/src/EntityScriptingInterface.h
index fef000cc3d..79d8f0a0b0 100644
--- a/libraries/entities/src/EntityScriptingInterface.h
+++ b/libraries/entities/src/EntityScriptingInterface.h
@@ -168,7 +168,7 @@ public slots:
 
     Q_INVOKABLE int getJointIndex(const QUuid& entityID, const QString& name);
     Q_INVOKABLE QStringList getJointNames(const QUuid& entityID);
-    
+    Q_INVOKABLE QVector<QUuid> getChildrenIDsOfJoint(const QUuid& parentID, int jointIndex);
 
 signals:
     void collisionWithEntity(const EntityItemID& idA, const EntityItemID& idB, const Collision& collision);
diff --git a/libraries/entities/src/SimpleEntitySimulation.cpp b/libraries/entities/src/SimpleEntitySimulation.cpp
index bdf27f4440..6bf25f767d 100644
--- a/libraries/entities/src/SimpleEntitySimulation.cpp
+++ b/libraries/entities/src/SimpleEntitySimulation.cpp
@@ -18,51 +18,69 @@
 #include "EntityItem.h"
 #include "EntitiesLogging.h"
 
-const quint64 MIN_SIMULATION_OWNERSHIP_UPDATE_PERIOD = 2 * USECS_PER_SECOND;
-
-void SimpleEntitySimulation::updateEntitiesInternal(const quint64& now) {
-    if (_entitiesWithSimulator.size() == 0) {
-        return;
-    }
-
-    if (now < _nextSimulationExpiry) {
-        // nothing has expired yet
-        return;
-    }
-
-    // If an Entity has a simulation owner but there has been no update for a while: clear the owner.
-    // If an Entity goes ownerless for too long: zero velocity and remove from _entitiesWithSimulator.
-    _nextSimulationExpiry = now + MIN_SIMULATION_OWNERSHIP_UPDATE_PERIOD;
+const quint64 MAX_OWNERLESS_PERIOD = 2 * USECS_PER_SECOND;
 
+void SimpleEntitySimulation::clearOwnership(const QUuid& ownerID) {
     QMutexLocker lock(&_mutex);
-    SetOfEntities::iterator itemItr = _entitiesWithSimulator.begin();
-    while (itemItr != _entitiesWithSimulator.end()) {
+    SetOfEntities::iterator itemItr = _entitiesWithSimulationOwner.begin();
+    while (itemItr != _entitiesWithSimulationOwner.end()) {
         EntityItemPointer entity = *itemItr;
-        quint64 expiry = entity->getLastChangedOnServer() + MIN_SIMULATION_OWNERSHIP_UPDATE_PERIOD;
-        if (expiry < now) {
-            if (entity->getSimulatorID().isNull()) {
-                // no simulators are volunteering
-                // zero the velocity on this entity so that it doesn't drift far away
-                entity->setVelocity(Vectors::ZERO);
-                entity->setAngularVelocity(Vectors::ZERO);
-                entity->setAcceleration(Vectors::ZERO);
-                // remove from list
-                itemItr = _entitiesWithSimulator.erase(itemItr);
-                continue;
-            } else {
-                // the simulator has stopped updating this object
-                // clear ownership and restart timer, giving nearby simulators time to volunteer
-                qCDebug(entities) << "auto-removing simulation owner " << entity->getSimulatorID();
-                entity->clearSimulationOwnership();
+        if (entity->getSimulatorID() == ownerID) {
+            // the simulator has abandonded this object --> remove from owned list
+            qCDebug(entities) << "auto-removing simulation owner " << entity->getSimulatorID();
+            itemItr = _entitiesWithSimulationOwner.erase(itemItr);
+
+            if (entity->getDynamic() && entity->hasLocalVelocity()) {
+                // it is still moving dynamically --> add to orphaned list
+                _entitiesThatNeedSimulationOwner.insert(entity);
+                quint64 expiry = entity->getLastChangedOnServer() + MAX_OWNERLESS_PERIOD;
+                if (expiry < _nextOwnerlessExpiry) {
+                    _nextOwnerlessExpiry = expiry;
+                }
             }
+
+            // remove ownership and dirty all the tree elements that contain the it
+            entity->clearSimulationOwnership();
             entity->markAsChangedOnServer();
-            // dirty all the tree elements that contain the entity
             DirtyOctreeElementOperator op(entity->getElement());
             getEntityTree()->recurseTreeWithOperator(&op);
-        } else if (expiry < _nextSimulationExpiry) {
-            _nextSimulationExpiry = expiry;
+        } else {
+            ++itemItr;
+        }
+    }
+}
+
+void SimpleEntitySimulation::updateEntitiesInternal(const quint64& now) {
+    if (now > _nextOwnerlessExpiry) {
+        // search for ownerless objects that have expired
+        QMutexLocker lock(&_mutex);
+        _nextOwnerlessExpiry = -1;
+        SetOfEntities::iterator itemItr = _entitiesThatNeedSimulationOwner.begin();
+        while (itemItr != _entitiesThatNeedSimulationOwner.end()) {
+            EntityItemPointer entity = *itemItr;
+            quint64 expiry = entity->getLastChangedOnServer() + MAX_OWNERLESS_PERIOD;
+            if (expiry < now) {
+                // no simulators have volunteered ownership --> remove from list
+                itemItr = _entitiesThatNeedSimulationOwner.erase(itemItr);
+
+                if (entity->getSimulatorID().isNull() && entity->getDynamic() && entity->hasLocalVelocity()) {
+                    // zero the derivatives
+                    entity->setVelocity(Vectors::ZERO);
+                    entity->setAngularVelocity(Vectors::ZERO);
+                    entity->setAcceleration(Vectors::ZERO);
+
+                    // dirty all the tree elements that contain it
+                    entity->markAsChangedOnServer();
+                    DirtyOctreeElementOperator op(entity->getElement());
+                    getEntityTree()->recurseTreeWithOperator(&op);
+                }
+            } else {
+                ++itemItr;
+                if (expiry < _nextOwnerlessExpiry) {
+                    _nextOwnerlessExpiry = expiry;
+                }
+            }
         }
-        ++itemItr;
     }
 }
 
@@ -70,26 +88,47 @@ void SimpleEntitySimulation::addEntityInternal(EntityItemPointer entity) {
     EntitySimulation::addEntityInternal(entity);
     if (!entity->getSimulatorID().isNull()) {
         QMutexLocker lock(&_mutex);
-        _entitiesWithSimulator.insert(entity);
+        _entitiesWithSimulationOwner.insert(entity);
+    } else if (entity->getDynamic() && entity->hasLocalVelocity()) {
+        QMutexLocker lock(&_mutex);
+        _entitiesThatNeedSimulationOwner.insert(entity);
+        quint64 expiry = entity->getLastChangedOnServer() + MAX_OWNERLESS_PERIOD;
+        if (expiry < _nextOwnerlessExpiry) {
+            _nextOwnerlessExpiry = expiry;
+        }
     }
 }
 
 void SimpleEntitySimulation::removeEntityInternal(EntityItemPointer entity) {
     EntitySimulation::removeEntityInternal(entity);
     QMutexLocker lock(&_mutex);
-    _entitiesWithSimulator.remove(entity);
+    _entitiesWithSimulationOwner.remove(entity);
+    _entitiesThatNeedSimulationOwner.remove(entity);
 }
 
 void SimpleEntitySimulation::changeEntityInternal(EntityItemPointer entity) {
     EntitySimulation::changeEntityInternal(entity);
-    if (!entity->getSimulatorID().isNull()) {
+    if (entity->getSimulatorID().isNull()) {
         QMutexLocker lock(&_mutex);
-        _entitiesWithSimulator.insert(entity);
+        _entitiesWithSimulationOwner.remove(entity);
+        if (entity->getDynamic() && entity->hasLocalVelocity()) {
+            _entitiesThatNeedSimulationOwner.insert(entity);
+            quint64 expiry = entity->getLastChangedOnServer() + MAX_OWNERLESS_PERIOD;
+            if (expiry < _nextOwnerlessExpiry) {
+                _nextOwnerlessExpiry = expiry;
+            }
+        }
+    } else {
+        QMutexLocker lock(&_mutex);
+        _entitiesWithSimulationOwner.insert(entity);
+        _entitiesThatNeedSimulationOwner.remove(entity);
     }
     entity->clearDirtyFlags();
 }
 
 void SimpleEntitySimulation::clearEntitiesInternal() {
-    _entitiesWithSimulator.clear();
+    QMutexLocker lock(&_mutex);
+    _entitiesWithSimulationOwner.clear();
+    _entitiesThatNeedSimulationOwner.clear();
 }
 
diff --git a/libraries/entities/src/SimpleEntitySimulation.h b/libraries/entities/src/SimpleEntitySimulation.h
index 53a7574bf2..d9c04fdcf9 100644
--- a/libraries/entities/src/SimpleEntitySimulation.h
+++ b/libraries/entities/src/SimpleEntitySimulation.h
@@ -21,6 +21,8 @@ public:
     SimpleEntitySimulation() : EntitySimulation() { }
     virtual ~SimpleEntitySimulation() { clearEntitiesInternal(); }
 
+    void clearOwnership(const QUuid& ownerID);
+
 protected:
     virtual void updateEntitiesInternal(const quint64& now) override;
     virtual void addEntityInternal(EntityItemPointer entity) override;
@@ -28,8 +30,9 @@ protected:
     virtual void changeEntityInternal(EntityItemPointer entity) override;
     virtual void clearEntitiesInternal() override;
 
-    SetOfEntities _entitiesWithSimulator;
-    quint64 _nextSimulationExpiry { 0 };
+    SetOfEntities _entitiesWithSimulationOwner;
+    SetOfEntities _entitiesThatNeedSimulationOwner;
+    quint64 _nextOwnerlessExpiry { 0 };
 };
 
 #endif // hifi_SimpleEntitySimulation_h
diff --git a/libraries/physics/src/EntityMotionState.cpp b/libraries/physics/src/EntityMotionState.cpp
index 8c0dab98db..6a818a1972 100644
--- a/libraries/physics/src/EntityMotionState.cpp
+++ b/libraries/physics/src/EntityMotionState.cpp
@@ -272,7 +272,7 @@ bool EntityMotionState::remoteSimulationOutOfSync(uint32_t simulationStep) {
     float dt = (float)(numSteps) * PHYSICS_ENGINE_FIXED_SUBSTEP;
 
     if (_numInactiveUpdates > 0) {
-        const uint8_t MAX_NUM_INACTIVE_UPDATES = 3;
+        const uint8_t MAX_NUM_INACTIVE_UPDATES = 20;
         if (_numInactiveUpdates > MAX_NUM_INACTIVE_UPDATES) {
             // clear local ownership (stop sending updates) and let the server clear itself
             _entity->clearSimulationOwnership();
@@ -282,7 +282,7 @@ bool EntityMotionState::remoteSimulationOutOfSync(uint32_t simulationStep) {
         // until it is removed from the outgoing updates
         // (which happens when we don't own the simulation and it isn't touching our simulation)
         const float INACTIVE_UPDATE_PERIOD = 0.5f;
-        return (dt > INACTIVE_UPDATE_PERIOD);
+        return (dt > INACTIVE_UPDATE_PERIOD * (float)_numInactiveUpdates);
     }
 
     if (!_body->isActive()) {
@@ -404,8 +404,7 @@ void EntityMotionState::sendUpdate(OctreeEditPacketSender* packetSender, const Q
     assert(_entity);
     assert(entityTreeIsLocked());
 
-    bool active = _body->isActive();
-    if (!active) {
+    if (!_body->isActive()) {
         // make sure all derivatives are zero
         glm::vec3 zero(0.0f);
         _entity->setVelocity(zero);
@@ -495,16 +494,12 @@ void EntityMotionState::sendUpdate(OctreeEditPacketSender* packetSender, const Q
         qCDebug(physics) << "       lastSimulated:" << debugTime(lastSimulated, now);
     #endif //def WANT_DEBUG
 
-    if (sessionID == _entity->getSimulatorID()) {
-        // we think we own the simulation
-        if (!active) {
-            // we own the simulation but the entity has stopped, so we tell the server that we're clearing simulatorID
-            // but we remember that we do still own it...  and rely on the server to tell us that we don't
-            properties.clearSimulationOwner();
-            _outgoingPriority = ZERO_SIMULATION_PRIORITY;
-        }
-        // else the ownership is not changing so we don't bother to pack it
-    } else {
+    if (_numInactiveUpdates > 0) {
+        // we own the simulation but the entity has stopped, so we tell the server that we're clearing simulatorID
+        // but we remember that we do still own it...  and rely on the server to tell us that we don't
+        properties.clearSimulationOwner();
+        _outgoingPriority = ZERO_SIMULATION_PRIORITY;
+    } else if (sessionID != _entity->getSimulatorID()) {
         // we don't own the simulation for this entity yet, but we're sending a bid for it
         properties.setSimulationOwner(sessionID, glm::max<uint8_t>(_outgoingPriority, VOLUNTEER_SIMULATION_PRIORITY));
         _nextOwnershipBid = now + USECS_BETWEEN_OWNERSHIP_BIDS;
diff --git a/libraries/shared/src/SpatiallyNestable.cpp b/libraries/shared/src/SpatiallyNestable.cpp
index 557b25d9b2..c8dceaa905 100644
--- a/libraries/shared/src/SpatiallyNestable.cpp
+++ b/libraries/shared/src/SpatiallyNestable.cpp
@@ -15,6 +15,7 @@
 #include "SpatiallyNestable.h"
 
 const float defaultAACubeSize = 1.0f;
+const int maxParentingChain = 30;
 
 SpatiallyNestable::SpatiallyNestable(NestableType nestableType, QUuid id) :
     _nestableType(nestableType),
@@ -56,14 +57,14 @@ void SpatiallyNestable::setParentID(const QUuid& parentID) {
     });
 }
 
-Transform SpatiallyNestable::getParentTransform(bool& success) const {
+Transform SpatiallyNestable::getParentTransform(bool& success, int depth) const {
     Transform result;
     SpatiallyNestablePointer parent = getParentPointer(success);
     if (!success) {
         return result;
     }
     if (parent) {
-        Transform parentTransform = parent->getTransform(_parentJointIndex, success);
+        Transform parentTransform = parent->getTransform(_parentJointIndex, success, depth + 1);
         result = parentTransform.setScale(1.0f); // TODO: scaling
     }
     return result;
@@ -393,11 +394,11 @@ void SpatiallyNestable::setOrientation(const glm::quat& orientation) {
 
 glm::vec3 SpatiallyNestable::getVelocity(bool& success) const {
     glm::vec3 result;
-    glm::vec3 parentVelocity = getParentVelocity(success);
+    Transform parentTransform = getParentTransform(success);
     if (!success) {
         return result;
     }
-    Transform parentTransform = getParentTransform(success);
+    glm::vec3 parentVelocity = getParentVelocity(success);
     if (!success) {
         return result;
     }
@@ -448,11 +449,11 @@ glm::vec3 SpatiallyNestable::getParentVelocity(bool& success) const {
 
 glm::vec3 SpatiallyNestable::getAngularVelocity(bool& success) const {
     glm::vec3 result;
-    glm::vec3 parentAngularVelocity = getParentAngularVelocity(success);
+    Transform parentTransform = getParentTransform(success);
     if (!success) {
         return result;
     }
-    Transform parentTransform = getParentTransform(success);
+    glm::vec3 parentAngularVelocity = getParentAngularVelocity(success);
     if (!success) {
         return result;
     }
@@ -499,22 +500,36 @@ glm::vec3 SpatiallyNestable::getParentAngularVelocity(bool& success) const {
     return result;
 }
 
-const Transform SpatiallyNestable::getTransform(bool& success) const {
-    // return a world-space transform for this object's location
-    Transform parentTransform = getParentTransform(success);
+const Transform SpatiallyNestable::getTransform(bool& success, int depth) const {
     Transform result;
+    // return a world-space transform for this object's location
+    Transform parentTransform = getParentTransform(success, depth);
     _transformLock.withReadLock([&] {
         Transform::mult(result, parentTransform, _transform);
     });
     return result;
 }
 
-const Transform SpatiallyNestable::getTransform(int jointIndex, bool& success) const {
+const Transform SpatiallyNestable::getTransform(int jointIndex, bool& success, int depth) const {
     // this returns the world-space transform for this object.  It finds its parent's transform (which may
     // cause this object's parent to query its parent, etc) and multiplies this object's local transform onto it.
     Transform jointInWorldFrame;
 
-    Transform worldTransform = getTransform(success);
+    if (depth > maxParentingChain) {
+        success = false;
+        // someone created a loop.  break it...
+        qDebug() << "Parenting loop detected.";
+        SpatiallyNestablePointer _this = getThisPointer();
+        _this->setParentID(QUuid());
+        bool setPositionSuccess;
+        AACube aaCube = getQueryAACube(setPositionSuccess);
+        if (setPositionSuccess) {
+            _this->setPosition(aaCube.calcCenter());
+        }
+        return jointInWorldFrame;
+    }
+
+    Transform worldTransform = getTransform(success, depth);
     worldTransform.setScale(1.0f); // TODO -- scale;
     if (!success) {
         return jointInWorldFrame;
@@ -682,7 +697,7 @@ QList<SpatiallyNestablePointer> SpatiallyNestable::getChildren() const {
     _childrenLock.withReadLock([&] {
         foreach(SpatiallyNestableWeakPointer childWP, _children.values()) {
             SpatiallyNestablePointer child = childWP.lock();
-            if (child) {
+            if (child && child->_parentKnowsMe && child->getParentID() == getID()) {
                 children << child;
             }
         }
diff --git a/libraries/shared/src/SpatiallyNestable.h b/libraries/shared/src/SpatiallyNestable.h
index 2a8976b38f..ee6cccc7a8 100644
--- a/libraries/shared/src/SpatiallyNestable.h
+++ b/libraries/shared/src/SpatiallyNestable.h
@@ -52,10 +52,10 @@ public:
     static glm::quat localToWorld(const glm::quat& orientation, const QUuid& parentID, int parentJointIndex, bool& success);
 
     // world frame
-    virtual const Transform getTransform(bool& success) const;
+    virtual const Transform getTransform(bool& success, int depth = 0) const;
     virtual void setTransform(const Transform& transform, bool& success);
 
-    virtual Transform getParentTransform(bool& success) const;
+    virtual Transform getParentTransform(bool& success, int depth = 0) const;
 
     virtual glm::vec3 getPosition(bool& success) const;
     virtual glm::vec3 getPosition() const;
@@ -92,7 +92,7 @@ public:
     virtual void setScale(const glm::vec3& scale);
 
     // get world-frame values for a specific joint
-    virtual const Transform getTransform(int jointIndex, bool& success) const;
+    virtual const Transform getTransform(int jointIndex, bool& success, int depth = 0) const;
     virtual glm::vec3 getPosition(int jointIndex, bool& success) const;
     virtual glm::vec3 getScale(int jointIndex) const;
 
diff --git a/plugins/openvr/src/ViveControllerManager.cpp b/plugins/openvr/src/ViveControllerManager.cpp
index 071d5fd631..0de8f6891d 100644
--- a/plugins/openvr/src/ViveControllerManager.cpp
+++ b/plugins/openvr/src/ViveControllerManager.cpp
@@ -60,10 +60,10 @@ void ViveControllerManager::activate() {
         [this] (bool clicked) { this->setRenderControllers(clicked); },
         true, true);
 
-    if (!_hmd) {
-        _hmd = acquireOpenVrSystem();
+    if (!_system) {
+        _system = acquireOpenVrSystem();
     }
-    Q_ASSERT(_hmd);
+    Q_ASSERT(_system);
 
     // OpenVR provides 3d mesh representations of the controllers
     // Disabled controller rendering code
@@ -71,7 +71,7 @@ void ViveControllerManager::activate() {
     auto renderModels = vr::VRRenderModels();
 
     vr::RenderModel_t model;
-    if (!_hmd->LoadRenderModel(CONTROLLER_MODEL_STRING, &model)) {
+    if (!_system->LoadRenderModel(CONTROLLER_MODEL_STRING, &model)) {
         qDebug() << QString("Unable to load render model %1\n").arg(CONTROLLER_MODEL_STRING);
     } else {
         model::Mesh* mesh = new model::Mesh();
@@ -118,7 +118,7 @@ void ViveControllerManager::activate() {
     }
     */
 
-    // unregister with UserInputMapper
+    // register with UserInputMapper
     auto userInputMapper = DependencyManager::get<controller::UserInputMapper>();
     userInputMapper->registerDevice(_inputDevice);
     _registeredWithInputMapper = true;
@@ -130,9 +130,9 @@ void ViveControllerManager::deactivate() {
     _container->removeMenuItem(MENU_NAME, RENDER_CONTROLLERS);
     _container->removeMenu(MENU_PATH);
 
-    if (_hmd) {
+    if (_system) {
         releaseOpenVrSystem();
-        _hmd = nullptr;
+        _system = nullptr;
     }
 
     _inputDevice->_poseStateMap.clear();
@@ -226,56 +226,56 @@ void ViveControllerManager::pluginUpdate(float deltaTime, const controller::Inpu
 
 void ViveControllerManager::InputDevice::update(float deltaTime, const controller::InputCalibrationData& inputCalibrationData, bool jointsCaptured) {
     _poseStateMap.clear();
-
     _buttonPressedMap.clear();
 
     PerformanceTimer perfTimer("ViveControllerManager::update");
 
+    auto leftHandDeviceIndex = _system->GetTrackedDeviceIndexForControllerRole(vr::TrackedControllerRole_LeftHand);
+    auto rightHandDeviceIndex = _system->GetTrackedDeviceIndexForControllerRole(vr::TrackedControllerRole_RightHand);
+
+    if (!jointsCaptured) {
+        handleHandController(deltaTime, leftHandDeviceIndex, inputCalibrationData, true);
+        handleHandController(deltaTime, rightHandDeviceIndex, inputCalibrationData, false);
+    }
+
     int numTrackedControllers = 0;
-
-    for (vr::TrackedDeviceIndex_t device = vr::k_unTrackedDeviceIndex_Hmd + 1;
-         device < vr::k_unMaxTrackedDeviceCount && numTrackedControllers < 2; ++device) {
-
-        if (!_hmd->IsTrackedDeviceConnected(device)) {
-            continue;
-        }
-
-        if (_hmd->GetTrackedDeviceClass(device) != vr::TrackedDeviceClass_Controller) {
-            continue;
-        }
-
-        if (!_trackedDevicePose[device].bPoseIsValid) {
-            continue;
-        }
-
+    if (leftHandDeviceIndex != vr::k_unTrackedDeviceIndexInvalid) {
         numTrackedControllers++;
-        bool left = numTrackedControllers == 2;
+    }
+    if (rightHandDeviceIndex != vr::k_unTrackedDeviceIndexInvalid) {
+        numTrackedControllers++;
+    }
+    _trackedControllers = numTrackedControllers;
+}
 
-        if (!jointsCaptured) {
-            const mat4& mat = _trackedDevicePoseMat4[device];
-            const vec3 linearVelocity = _trackedDeviceLinearVelocities[device];
-            const vec3 angularVelocity = _trackedDeviceAngularVelocities[device];
-            handlePoseEvent(inputCalibrationData, mat, linearVelocity, angularVelocity, numTrackedControllers - 1);
-        }
+void ViveControllerManager::InputDevice::handleHandController(float deltaTime, uint32_t deviceIndex, const controller::InputCalibrationData& inputCalibrationData, bool isLeftHand) {
+
+    if (_system->IsTrackedDeviceConnected(deviceIndex) &&
+        _system->GetTrackedDeviceClass(deviceIndex) == vr::TrackedDeviceClass_Controller &&
+        _trackedDevicePose[deviceIndex].bPoseIsValid) {
+
+        // process pose
+        const mat4& mat = _trackedDevicePoseMat4[deviceIndex];
+        const vec3 linearVelocity = _trackedDeviceLinearVelocities[deviceIndex];
+        const vec3 angularVelocity = _trackedDeviceAngularVelocities[deviceIndex];
+        handlePoseEvent(deltaTime, inputCalibrationData, mat, linearVelocity, angularVelocity, isLeftHand);
 
-        // handle inputs
         vr::VRControllerState_t controllerState = vr::VRControllerState_t();
-        if (_hmd->GetControllerState(device, &controllerState)) {
-            //qDebug() << (numTrackedControllers == 1 ? "Left: " : "Right: ");
-            //qDebug() << "Trackpad: " << controllerState.rAxis[0].x << " " << controllerState.rAxis[0].y;
-            //qDebug() << "Trigger: " << controllerState.rAxis[1].x << " " << controllerState.rAxis[1].y;
+        if (_system->GetControllerState(deviceIndex, &controllerState)) {
+
+            // process each button
             for (uint32_t i = 0; i < vr::k_EButton_Max; ++i) {
                 auto mask = vr::ButtonMaskFromId((vr::EVRButtonId)i);
                 bool pressed = 0 != (controllerState.ulButtonPressed & mask);
-                handleButtonEvent(i, pressed, left);
+                handleButtonEvent(deltaTime, i, pressed, isLeftHand);
             }
+
+            // process each axis
             for (uint32_t i = 0; i < vr::k_unControllerStateAxisCount; i++) {
-                handleAxisEvent(i, controllerState.rAxis[i].x, controllerState.rAxis[i].y, left);
+                handleAxisEvent(deltaTime, i, controllerState.rAxis[i].x, controllerState.rAxis[i].y, isLeftHand);
             }
         }
     }
-
-    _trackedControllers = numTrackedControllers;
 }
 
 void ViveControllerManager::InputDevice::focusOutEvent() {
@@ -284,42 +284,46 @@ void ViveControllerManager::InputDevice::focusOutEvent() {
 };
 
 // These functions do translation from the Steam IDs to the standard controller IDs
-void ViveControllerManager::InputDevice::handleAxisEvent(uint32_t axis, float x, float y, bool left) {
+void ViveControllerManager::InputDevice::handleAxisEvent(float deltaTime, uint32_t axis, float x, float y, bool isLeftHand) {
     //FIX ME? It enters here every frame: probably we want to enter only if an event occurs
     axis += vr::k_EButton_Axis0;
     using namespace controller;
+
     if (axis == vr::k_EButton_SteamVR_Touchpad) {
-        _axisStateMap[left ? LX : RX] = x;
-        _axisStateMap[left ? LY : RY] = y;
+        glm::vec2 stick(x, y);
+        if (isLeftHand) {
+            stick = _filteredLeftStick.process(deltaTime, stick);
+        } else {
+            stick = _filteredRightStick.process(deltaTime, stick);
+        }
+        _axisStateMap[isLeftHand ? LX : RX] = stick.x;
+        _axisStateMap[isLeftHand ? LY : RY] = stick.y;
     } else if (axis == vr::k_EButton_SteamVR_Trigger) {
-        _axisStateMap[left ? LT : RT] = x;
+        _axisStateMap[isLeftHand ? LT : RT] = x;
     }
 }
 
 // These functions do translation from the Steam IDs to the standard controller IDs
-void ViveControllerManager::InputDevice::handleButtonEvent(uint32_t button, bool pressed, bool left) {
+void ViveControllerManager::InputDevice::handleButtonEvent(float deltaTime, uint32_t button, bool pressed, bool isLeftHand) {
     if (!pressed) {
         return;
     }
 
+    using namespace controller;
     if (button == vr::k_EButton_ApplicationMenu) {
-        _buttonPressedMap.insert(left ? controller::LEFT_PRIMARY_THUMB : controller::RIGHT_PRIMARY_THUMB);
+        _buttonPressedMap.insert(isLeftHand ? LEFT_PRIMARY_THUMB : RIGHT_PRIMARY_THUMB);
     } else if (button == vr::k_EButton_Grip) {
-        // Tony says these are harder to reach, so make them the meta buttons
-        _buttonPressedMap.insert(left ? controller::LB : controller::RB);
+        _buttonPressedMap.insert(isLeftHand ? LB : RB);
     } else if (button == vr::k_EButton_SteamVR_Trigger) {
-        _buttonPressedMap.insert(left ? controller::LT : controller::RT);
+        _buttonPressedMap.insert(isLeftHand ? LT : RT);
     } else if (button == vr::k_EButton_SteamVR_Touchpad) {
-        _buttonPressedMap.insert(left ? controller::LS : controller::RS);
-    } else if (button == vr::k_EButton_System) {
-        //FIX ME: not able to ovrewrite the behaviour of this button
-        _buttonPressedMap.insert(left ? controller::LEFT_SECONDARY_THUMB : controller::RIGHT_SECONDARY_THUMB);
+        _buttonPressedMap.insert(isLeftHand ? LS : RS);
     }
 }
 
-void ViveControllerManager::InputDevice::handlePoseEvent(const controller::InputCalibrationData& inputCalibrationData,
+void ViveControllerManager::InputDevice::handlePoseEvent(float deltaTime, const controller::InputCalibrationData& inputCalibrationData,
                                                          const mat4& mat, const vec3& linearVelocity,
-                                                         const vec3& angularVelocity, bool left) {
+                                                         const vec3& angularVelocity, bool isLeftHand) {
     // When the sensor-to-world rotation is identity the coordinate axes look like this:
     //
     //                       user
@@ -384,8 +388,8 @@ void ViveControllerManager::InputDevice::handlePoseEvent(const controller::Input
     static const glm::vec3 leftTranslationOffset = glm::vec3(-1.0f, 1.0f, 1.0f) * CONTROLLER_OFFSET;
     static const glm::vec3 rightTranslationOffset = CONTROLLER_OFFSET;
 
-    auto translationOffset = (left ? leftTranslationOffset : rightTranslationOffset);
-    auto rotationOffset = (left ? leftRotationOffset : rightRotationOffset);
+    auto translationOffset = (isLeftHand ? leftTranslationOffset : rightTranslationOffset);
+    auto rotationOffset = (isLeftHand ? leftRotationOffset : rightRotationOffset);
 
     glm::vec3 position = extractTranslation(mat);
     glm::quat rotation = glm::normalize(glm::quat_cast(mat));
@@ -399,7 +403,7 @@ void ViveControllerManager::InputDevice::handlePoseEvent(const controller::Input
     // handle change in velocity due to translationOffset
     avatarPose.velocity = linearVelocity + glm::cross(angularVelocity, position - extractTranslation(mat));
     avatarPose.angularVelocity = angularVelocity;
-    _poseStateMap[left ? controller::LEFT_HAND : controller::RIGHT_HAND] = avatarPose.transform(controllerToAvatar);
+    _poseStateMap[isLeftHand ? controller::LEFT_HAND : controller::RIGHT_HAND] = avatarPose.transform(controllerToAvatar);
 }
 
 controller::Input::NamedVector ViveControllerManager::InputDevice::getAvailableInputs() const {
diff --git a/plugins/openvr/src/ViveControllerManager.h b/plugins/openvr/src/ViveControllerManager.h
index 51339cd465..480fbfeb90 100644
--- a/plugins/openvr/src/ViveControllerManager.h
+++ b/plugins/openvr/src/ViveControllerManager.h
@@ -50,7 +50,7 @@ public:
 private:
     class InputDevice : public controller::InputDevice {
     public:
-        InputDevice(vr::IVRSystem*& hmd) : controller::InputDevice("Vive"), _hmd(hmd) {}
+        InputDevice(vr::IVRSystem*& system) : controller::InputDevice("Vive"), _system(system) {}
     private:
         // Device functions
         virtual controller::Input::NamedVector getAvailableInputs() const override;
@@ -58,20 +58,46 @@ private:
         virtual void update(float deltaTime, const controller::InputCalibrationData& inputCalibrationData, bool jointsCaptured) override;
         virtual void focusOutEvent() override;
 
-        void handleButtonEvent(uint32_t button, bool pressed, bool left);
-        void handleAxisEvent(uint32_t axis, float x, float y, bool left);
-        void handlePoseEvent(const controller::InputCalibrationData& inputCalibrationData, const mat4& mat,
-                             const vec3& linearVelocity, const vec3& angularVelocity, bool left);
+        void handleHandController(float deltaTime, uint32_t deviceIndex, const controller::InputCalibrationData& inputCalibrationData, bool isLeftHand);
+        void handleButtonEvent(float deltaTime, uint32_t button, bool pressed, bool isLeftHand);
+        void handleAxisEvent(float deltaTime, uint32_t axis, float x, float y, bool isLeftHand);
+        void handlePoseEvent(float deltaTime, const controller::InputCalibrationData& inputCalibrationData, const mat4& mat,
+                             const vec3& linearVelocity, const vec3& angularVelocity, bool isLeftHand);
+
+        class FilteredStick {
+        public:
+            glm::vec2 process(float deltaTime, const glm::vec2& stick) {
+                // Use a timer to prevent the stick going to back to zero.
+                // This to work around the noisy touch pad that will flash back to zero breifly
+                const float ZERO_HYSTERESIS_PERIOD = 0.2f;  // 200 ms
+                if (glm::length(stick) == 0.0f) {
+                    if (_timer <= 0.0f) {
+                        return glm::vec2(0.0f, 0.0f);
+                    } else {
+                        _timer -= deltaTime;
+                        return _stick;
+                    }
+                } else {
+                    _timer = ZERO_HYSTERESIS_PERIOD;
+                    _stick = stick;
+                    return stick;
+                }
+            }
+        protected:
+            float _timer { 0.0f };
+            glm::vec2 _stick { 0.0f, 0.0f };
+        };
+
+        FilteredStick _filteredLeftStick;
+        FilteredStick _filteredRightStick;
 
         int _trackedControllers { 0 };
-        vr::IVRSystem*& _hmd;
+        vr::IVRSystem*& _system;
         friend class ViveControllerManager;
     };
 
     void renderHand(const controller::Pose& pose, gpu::Batch& batch, int sign);
 
-
-
     bool _registeredWithInputMapper { false };
     bool _modelLoaded { false };
     model::Geometry _modelGeometry;
@@ -81,8 +107,8 @@ private:
     int _rightHandRenderID { 0 };
 
     bool _renderControllers { false };
-    vr::IVRSystem* _hmd { nullptr };
-    std::shared_ptr<InputDevice> _inputDevice { std::make_shared<InputDevice>(_hmd) };
+    vr::IVRSystem* _system { nullptr };
+    std::shared_ptr<InputDevice> _inputDevice { std::make_shared<InputDevice>(_system) };
 
     static const QString NAME;
 
diff --git a/unpublishedScripts/DomainContent/CellScience/Scripts/moveRandomly.js b/unpublishedScripts/DomainContent/CellScience/Scripts/moveRandomly.js
deleted file mode 100644
index a975f74733..0000000000
--- a/unpublishedScripts/DomainContent/CellScience/Scripts/moveRandomly.js
+++ /dev/null
@@ -1,182 +0,0 @@
-//  Copyright 2016 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
-//
-(function() {
-
-    var self = this;
-
-    this.preload = function(entityId) {
-        //print('preload move randomly')
-        this.isConnected = false;
-        this.entityId = entityId;
-        this.updateInterval = 100;
-        this.posFrame = 0;
-        this.rotFrame = 0;
-        this.posInterval = 100;
-        this.rotInterval = 100;
-        this.minVelocity = 1;
-        this.maxVelocity = 5;
-        this.minAngularVelocity = 0.01;
-        this.maxAngularVelocity = 0.03;
-
-        this.initialize(entityId);
-        this.initTimeout = null;
-
-
-        var userData = {
-            ownershipKey: {
-                owner: MyAvatar.sessionUUID
-            },
-            grabbableKey: {
-                grabbable: false
-            }
-        };
-
-        Entities.editEntity(entityId, {
-            userData: JSON.stringify(userData)
-        })
-    }
-
-    this.initialize = function(entityId) {
-        //print('move randomly  should initialize' + entityId)
-        var properties = Entities.getEntityProperties(entityId);
-        if (properties.userData.length === 0 || properties.hasOwnProperty('userData') === false) {
-            self.initTimeout = Script.setTimeout(function() {
-                //print('no user data yet, try again in one second')
-                self.initialize(entityId);
-            }, 1000)
-
-        } else {
-            //print('userdata before parse attempt' + properties.userData)
-            self.userData = null;
-            try {
-                self.userData = JSON.parse(properties.userData);
-            } catch (err) {
-                //print('error parsing json');
-                //print('properties are:' + properties.userData);
-                return;
-            }
-            Script.update.connect(self.update);
-            this.isConnected = true;
-        }
-    }
-
-    this.update = function(deltaTime) {
-        // print('jbp in update')
-        var data = Entities.getEntityProperties(self.entityId, 'userData').userData;
-        var userData;
-        try {
-            userData = JSON.parse(data)
-        } catch (e) {
-            //print('error parsing json' + data)
-            return;
-        };
-
-        // print('userdata is' + data)
-        //if the entity doesnt have an owner set yet
-        if (userData.hasOwnProperty('ownershipKey') !== true) {
-            //print('no movement owner yet')
-            return;
-        }
-
-        //print('owner is:::' + userData.ownershipKey.owner)
-            //get all the avatars to see if the owner is around
-        var avatars = AvatarList.getAvatarIdentifiers();
-        var ownerIsAround = false;
-
-        //if the current owner is not me...
-        if (userData.ownershipKey.owner !== MyAvatar.sessionUUID) {
-
-            //look to see if the current owner is around anymore
-            for (var i = 0; i < avatars.length; i++) {
-                if (avatars[i] === userData.ownershipKey.owner) {
-                    ownerIsAround = true
-                        //the owner is around
-                    return;
-                };
-            }
-
-            //if the owner is not around, then take ownership
-            if (ownerIsAround === false) {
-                //print('taking ownership')
-
-                var userData = {
-                    ownershipKey: {
-                        owner: MyAvatar.sessionUUID
-                    },
-                    grabbableKey: {
-                        grabbable: false
-                    }
-                };
-                Entities.editEntity(self.entityId, {
-                    userData: JSON.stringify(data)
-                })
-            }
-        }
-        //but if the current owner IS me, then move it
-        else {
-            //print('jbp im the owner so move it')
-            self.posFrame++;
-            self.rotFrame++;
-
-            if (self.posFrame > self.posInterval) {
-
-                self.posInterval = 100 * Math.random() + 300;
-                self.posFrame = 0;
-
-                var magnitudeV = self.maxVelocity;
-                var directionV = {
-                    x: Math.random() - 0.5,
-                    y: Math.random() - 0.5,
-                    z: Math.random() - 0.5
-                };
-
-                //print("POS magnitude is " + magnitudeV + " and direction is " + directionV.x);
-                Entities.editEntity(self.entityId, {
-                    velocity: Vec3.multiply(magnitudeV, Vec3.normalize(directionV))
-
-                });
-
-            }
-
-            if (self.rotFrame > self.rotInterval) {
-
-                self.rotInterval = 100 * Math.random() + 250;
-                self.rotFrame = 0;
-
-                var magnitudeAV = self.maxAngularVelocity;
-
-                var directionAV = {
-                    x: Math.random() - 0.5,
-                    y: Math.random() - 0.5,
-                    z: Math.random() - 0.5
-                };
-                //print("ROT magnitude is " + magnitudeAV + " and direction is " + directionAV.x);
-                Entities.editEntity(self.entityId, {
-                    angularVelocity: Vec3.multiply(magnitudeAV, Vec3.normalize(directionAV))
-
-                });
-
-            }
-
-        }
-
-    }
-
-    this.unload = function() {
-        if (this.initTimeout !== null) {
-            Script.clearTimeout(this.initTimeout);
-        }
-
-        if (this.isConnected === true) {
-            Script.update.disconnect(this.update);
-        }
-
-    }
-
-
-
-})
\ No newline at end of file
diff --git a/unpublishedScripts/DomainContent/CellScience/Scripts/navigationButton.js b/unpublishedScripts/DomainContent/CellScience/Scripts/navigationButton.js
index 4136f1f81b..c1187bc6d5 100644
--- a/unpublishedScripts/DomainContent/CellScience/Scripts/navigationButton.js
+++ b/unpublishedScripts/DomainContent/CellScience/Scripts/navigationButton.js
@@ -7,7 +7,7 @@
 
 (function() {
 
-    var version = 11;
+    var version = 12;
     var added = false;
     this.frame = 0;
     var utilsScript = Script.resolvePath('utils.js');
@@ -23,22 +23,21 @@
     }
 
     this.initialize = function(entityId) {
-        print('JBP nav button should initialize' + entityId)
         var properties = Entities.getEntityProperties(entityId);
         if (properties.userData.length === 0 || properties.hasOwnProperty('userData') === false) {
             self.initTimeout = Script.setTimeout(function() {
-                print('JBP no user data yet, try again in one second')
+                //    print(' no user data yet, try again in one second')
                 self.initialize(entityId);
             }, 1000)
 
         } else {
-            print('JBP userdata before parse attempt' + properties.userData)
+            // print('userdata before parse attempt' + properties.userData)
             self.userData = null;
             try {
                 self.userData = JSON.parse(properties.userData);
             } catch (err) {
-                print('JBP error parsing json');
-                print('JBP properties are:' + properties.userData);
+                //  print(' error parsing json');
+                //  print(' properties are:' + properties.userData);
                 return;
             }
 
@@ -46,9 +45,9 @@
             var mySavedSettings = Settings.getValue(entityId);
 
             if (mySavedSettings.buttons !== undefined) {
-                print('JBP preload buttons' + mySavedSettings.buttons)
+                // print(' preload buttons' + mySavedSettings.buttons)
                 mySavedSettings.buttons.forEach(function(b) {
-                    print('JBP deleting button' + b)
+                    // print(' deleting button' + b)
                     Overlays.deleteOverlay(b);
                 })
                 Settings.setValue(entityId, '')
@@ -56,16 +55,15 @@
 
 
             self.buttonImageURL = baseURL + "GUI/GUI_" + self.userData.name + ".png?" + version;
-            print('JBP BUTTON IMAGE URL:' + self.buttonImageURL)
+            // print(' BUTTON IMAGE URL:' + self.buttonImageURL)
             if (self.button === undefined) {
-                // print('NAV NO BUTTON ADDING ONE!!')
+                //    print(' NO BUTTON ADDING ONE!!')
                 self.button = true;
                 self.addButton();
 
             } else {
-                // print('NAV SELF ALREADY HAS A BUTTON!!')
+                //print(' SELF ALREADY HAS A BUTTON!!')
             }
-
         }
     }
 
diff --git a/unpublishedScripts/DomainContent/CellScience/Scripts/showButtonToPlaySound.js b/unpublishedScripts/DomainContent/CellScience/Scripts/showButtonToPlaySound.js
index 6651e435b4..8ee5e0092e 100644
--- a/unpublishedScripts/DomainContent/CellScience/Scripts/showButtonToPlaySound.js
+++ b/unpublishedScripts/DomainContent/CellScience/Scripts/showButtonToPlaySound.js
@@ -36,8 +36,6 @@
                     return;
                 }
 
-
-
                 self.addButton();
                 self.buttonShowing = false;
                 self.showDistance = self.userData.showDistance;
@@ -51,8 +49,6 @@
                 };
                 self.sound = SoundCache.getSound(this.soundURL);
 
-
-
             }
 
             this.addButton = function() {
diff --git a/unpublishedScripts/DomainContent/CellScience/Scripts/showIdentification.js b/unpublishedScripts/DomainContent/CellScience/Scripts/showIdentification.js
index d8b32ab176..3f6067693c 100644
--- a/unpublishedScripts/DomainContent/CellScience/Scripts/showIdentification.js
+++ b/unpublishedScripts/DomainContent/CellScience/Scripts/showIdentification.js
@@ -10,7 +10,7 @@
     var self = this;
     var baseURL = "https://hifi-content.s3.amazonaws.com/DomainContent/CellScience/";
 
-    var version = 2;
+    var version = 3;
     this.preload = function(entityId) {
         this.soundPlaying = null;
         this.entityId = entityId;
diff --git a/unpublishedScripts/DomainContent/CellScience/Scripts/zoom.js b/unpublishedScripts/DomainContent/CellScience/Scripts/zoom.js
index da41ec64ba..3fc5acae2a 100644
--- a/unpublishedScripts/DomainContent/CellScience/Scripts/zoom.js
+++ b/unpublishedScripts/DomainContent/CellScience/Scripts/zoom.js
@@ -52,13 +52,7 @@
             print("Teleporting to (" + data.location.x + ", " + data.location.y + ", " + data.location.z + ")");
 
              MyAvatar.position = data.location;
-             
-            // if (data.hasOwnProperty('entryPoint') && data.hasOwnProperty('target')) {
-            //     this.lookAtTarget(data.entryPoint, data.target);
-            // }
-            // else{
 
-            // }
         }
 
     }
@@ -103,10 +97,4 @@
         }
     }
 
-    this.hoverEnterEntity = function(entityID) {
-        Entities.editEntity(entityID, {
-            animationURL: animationURL,
-            animationSettings: '{ "fps": 24, "firstFrame": 1, "lastFrame": 25, "frameIndex": 1, "running": true, "hold": true }'
-        });
-    }
 })
\ No newline at end of file
diff --git a/unpublishedScripts/DomainContent/CellScience/backgroundMusicAC.js b/unpublishedScripts/DomainContent/CellScience/backgroundMusicAC.js
index 0ee5b3bf32..1b4c06caaa 100644
--- a/unpublishedScripts/DomainContent/CellScience/backgroundMusicAC.js
+++ b/unpublishedScripts/DomainContent/CellScience/backgroundMusicAC.js
@@ -7,7 +7,7 @@ var soundMap = [{
                 y: 15850,
                 z: 15850
             },
-            volume: 0.1,
+            volume: 0.03,
             loop: true
         }
     }, {
@@ -19,7 +19,7 @@ var soundMap = [{
                 y: 15950,
                 z: 15950
             },
-            volume: 0.1,
+            volume: 0.03,
             loop: true
         }
     }, {
@@ -31,7 +31,7 @@ var soundMap = [{
                 y: 15650,
                 z: 15650
             },
-            volume: 0.1,
+            volume: 0.03,
             loop: true
         }
     }, {
@@ -43,7 +43,7 @@ var soundMap = [{
                 y: 15750,
                 z: 15750
             },
-            volume: 0.1,
+            volume: 0.03,
             loop: true
         }
     }
diff --git a/unpublishedScripts/DomainContent/CellScience/importCellScience.js b/unpublishedScripts/DomainContent/CellScience/importCellScience.js
index ca0eb21f21..876df8adb1 100644
--- a/unpublishedScripts/DomainContent/CellScience/importCellScience.js
+++ b/unpublishedScripts/DomainContent/CellScience/importCellScience.js
@@ -5,7 +5,7 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
-var version = 1035;
+var version = 1112;
 var cellLayout;
 var baseLocation = "https://hifi-content.s3.amazonaws.com/DomainContent/CellScience/";
 
@@ -103,9 +103,9 @@ var scenes = [{
     instances: [{
         model: "Cell",
         dimensions: {
-            x: 550,
-            y: 620,
-            z: 550
+            x: 500,
+            y: 570,
+            z: 500
         },
         offset: {
             x: 0,
@@ -151,294 +151,253 @@ var scenes = [{
         skybox: "cosmos_skybox_blurred"
     },
     instances: [{
-            model: "translation",
-            dimensions: {
-                x: 10,
-                y: 16,
-                z: 10
-            },
-            offset: {
-                x: 0,
-                y: 0,
-                z: 0
-            },
-            radius: 300,
-            number: 7,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                },
-                target: locations.ribosome[1],
-                location: locations.ribosome[0],
-                baseURL: baseLocation
-            }),
-            script: "zoom.js?" + version,
-            visible: true
-        }, {
-            model: "vesicle",
-            dimensions: {
-                x: 60,
-                y: 60,
-                z: 60
-            },
-            randomSize: 10,
-            offset: {
-                x: 0,
-                y: 0,
-                z: 0
-            },
-            radius: 1000,
-            number: 22,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                }
-            }),
-            script: "moveRandomly.js?" + version,
-            visible: true
-        }, { //golgi vesicles
-            model: "vesicle",
-            dimensions: {
-                x: 10,
-                y: 10,
-                z: 10
-            },
-            randomSize: 10,
-            offset: {
-                x: -319,
-                y: 66,
-                z: 976
-            },
-            radius: 140,
-            number: 10,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                }
-            }),
-            script: "",
-            visible: true
-        }, { //golgi vesicles
-            model: "vesicle",
-            dimensions: {
-                x: 15,
-                y: 15,
-                z: 15
-            },
-            randomSize: 10,
-            offset: {
-                x: -319,
-                y: 66,
-                z: 976
-            },
-            radius: 115,
-            number: 7,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                }
-            }),
-            script: "moveRandomly.js?" + version,
-            visible: true
-        }, {
-            model: "vesicle",
-            dimensions: {
-                x: 50,
-                y: 50,
-                z: 50
-            },
-            randomSize: 10,
-            offset: {
-                x: 0,
-                y: 0,
-                z: 0
-            },
-            radius: 600,
-            number: 15,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                }
-            }),
-            script: "",
-            visible: true
-        }, { //outer vesicles
-            model: "vesicle",
-            dimensions: {
-                x: 60,
-                y: 60,
-                z: 60
-            },
-            randomSize: 10,
-            offset: {
-                x: 0,
-                y: 0,
-                z: 0
-            },
-            radius: 1600,
-            number: 22,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                }
-            }),
-            script: "",
-            visible: true
-        }, { //outer vesicles
-            model: "vesicle",
-            dimensions: {
-                x: 40,
-                y: 40,
-                z: 40
-            },
-            randomSize: 10,
-            offset: {
-                x: 0,
-                y: 0,
-                z: 0
-            },
-            radius: 1400,
-            number: 22,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                }
-            }),
-            script: "moveRandomly.js?" + version,
-            visible: true
-        }, { //outer vesicles
-            model: "vesicle",
-            dimensions: {
-                x: 80,
-                y: 80,
-                z: 80
-            },
-            randomSize: 10,
-            offset: {
-                x: 0,
-                y: 0,
-                z: 0
-            },
-            radius: 1800,
-            number: 22,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                }
-            }),
-            script: "moveRandomly.js?" + version,
-            visible: true
+        model: "translation",
+        dimensions: {
+            x: 10,
+            y: 16,
+            z: 10
         },
-        //          {//wigglies
-        //              model:"wiggly",
-        //              dimensions:{x:320,y:40,z:160},
-        //              randomSize: 10,
-        //              offset:{x:0,y:0,z:0},
-        //              radius:1800,
-        //              number:50,
-        //              userData:"",
-        //              script:"moveRandomly",
-        //              visible:true
-        //          },
-        ////            {//wigglies
-        //              model:"wiggly",
-        //              dimensions:{x:640,y:80,z:320},
-        //              randomSize: 10,
-        //              offset:{x:0,y:0,z:0},
-        //              radius:2100,
-        //              number:50,
-        //              userData:"",
-        //              script:"moveRandomly",
-        //              visible:true
-        //          },
-        {
-            model: "hexokinase",
-            dimensions: {
-                x: 3,
-                y: 4,
-                z: 3
+        offset: {
+            x: 0,
+            y: 0,
+            z: 0
+        },
+        radius: 300,
+        number: 7,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
             },
-            randomSize: 10,
-            offset: {
-                x: 236,
-                y: 8,
-                z: 771
+            target: locations.ribosome[1],
+            location: locations.ribosome[0],
+            baseURL: baseLocation
+        }),
+        script: "zoom.js?" + version,
+        visible: true
+    }, {
+        model: "vesicle",
+        dimensions: {
+            x: 60,
+            y: 60,
+            z: 60
+        },
+        randomSize: 10,
+        offset: {
+            x: 0,
+            y: 0,
+            z: 0
+        },
+        radius: 1000,
+        number: 22,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
+            }
+        }),
+        visible: true
+    }, { //golgi vesicles
+        model: "vesicle",
+        dimensions: {
+            x: 10,
+            y: 10,
+            z: 10
+        },
+        randomSize: 10,
+        offset: {
+            x: -319,
+            y: 66,
+            z: 976
+        },
+        radius: 140,
+        number: 10,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
+            }
+        }),
+        script: "",
+        visible: true
+    }, { //golgi vesicles
+        model: "vesicle",
+        dimensions: {
+            x: 15,
+            y: 15,
+            z: 15
+        },
+        randomSize: 10,
+        offset: {
+            x: -319,
+            y: 66,
+            z: 976
+        },
+        radius: 115,
+        number: 7,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
+            }
+        }),
+        visible: true
+    }, {
+        model: "vesicle",
+        dimensions: {
+            x: 50,
+            y: 50,
+            z: 50
+        },
+        randomSize: 10,
+        offset: {
+            x: 0,
+            y: 0,
+            z: 0
+        },
+        radius: 600,
+        number: 15,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
+            }
+        }),
+        script: "",
+        visible: true
+    }, { //outer vesicles
+        model: "vesicle",
+        dimensions: {
+            x: 60,
+            y: 60,
+            z: 60
+        },
+        randomSize: 10,
+        offset: {
+            x: 0,
+            y: 0,
+            z: 0
+        },
+        radius: 1600,
+        number: 22,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
+            }
+        }),
+        script: "",
+        visible: true
+    }, { //outer vesicles
+        model: "vesicle",
+        dimensions: {
+            x: 40,
+            y: 40,
+            z: 40
+        },
+        randomSize: 10,
+        offset: {
+            x: 0,
+            y: 0,
+            z: 0
+        },
+        radius: 1400,
+        number: 22,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
+            }
+        }),
+        visible: true
+    }, { //outer vesicles
+        model: "vesicle",
+        dimensions: {
+            x: 80,
+            y: 80,
+            z: 80
+        },
+        randomSize: 10,
+        offset: {
+            x: 0,
+            y: 0,
+            z: 0
+        },
+        radius: 1800,
+        number: 22,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
+            }
+        }),
+        visible: true
+    }, {
+        model: "hexokinase",
+        dimensions: {
+            x: 3,
+            y: 4,
+            z: 3
+        },
+        randomSize: 10,
+        offset: {
+            x: 236,
+            y: 8,
+            z: 771
+        },
+        radius: 80,
+        number: 7,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
             },
-            radius: 80,
-            number: 7,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                },
-                target: locations.hexokinase[1],
-                location: locations.hexokinase[0],
-                baseURL: baseLocation
-            }),
-            script: "zoom.js?" + version,
-            visible: true
-        }, {
-            model: "pfructo_kinase",
-            dimensions: {
-                x: 3,
-                y: 4,
-                z: 3
+            target: locations.hexokinase[1],
+            location: locations.hexokinase[0],
+            baseURL: baseLocation
+        }),
+        script: "zoom.js?" + version,
+        visible: true
+    }, {
+        model: "pfructo_kinase",
+        dimensions: {
+            x: 3,
+            y: 4,
+            z: 3
+        },
+        randomSize: 10,
+        offset: {
+            x: 236,
+            y: 8,
+            z: 771
+        },
+        radius: 60,
+        number: 7,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
             },
-            randomSize: 10,
-            offset: {
-                x: 236,
-                y: 8,
-                z: 771
+            target: locations.hexokinase[1],
+            location: locations.hexokinase[0],
+        }),
+        script: "zoom.js?" + version,
+        visible: true
+    }, {
+        model: "glucose_isomerase",
+        dimensions: {
+            x: 3,
+            y: 4,
+            z: 3
+        },
+        randomSize: 10,
+        offset: {
+            x: 236,
+            y: 8,
+            z: 771
+        },
+        radius: 70,
+        number: 7,
+        userData: JSON.stringify({
+            grabbableKey: {
+                grabbable: false
             },
-            radius: 60,
-            number: 7,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                },
-                target: locations.hexokinase[1],
-                location: locations.hexokinase[0],
-            }),
-            script: "zoom.js?" + version,
-            visible: true
-        }, {
-            model: "glucose_isomerase",
-            dimensions: {
-                x: 3,
-                y: 4,
-                z: 3
-            },
-            randomSize: 10,
-            offset: {
-                x: 236,
-                y: 8,
-                z: 771
-            },
-            radius: 70,
-            number: 7,
-            userData: JSON.stringify({
-                grabbableKey: {
-                    grabbable: false
-                },
-                target: locations.hexokinase[1],
-                location: locations.hexokinase[0],
-            }),
-            script: "zoom.js?" + version,
-            visible: true
-        }
-        //          {
-        //              model:"NPC",
-        //              dimensions:{x:20,y:20,z:20},
-        //              randomSize: 10,
-        //              offset:{x:208.593693,y:6.113100222,z:153.3202277},
-        //              radius:520,
-        //              number:25,
-        //              userData: "",
-        //              script:"",
-        //              visible:true
-        //          }
-
-
-    ],
+            target: locations.hexokinase[1],
+            location: locations.hexokinase[0],
+        }),
+        script: "zoom.js?" + version,
+        visible: true
+    }],
     boundary: {
         radius: locations.cellLayout[2],
         center: locations.cellLayout[0],
@@ -600,7 +559,7 @@ function ImportScene(scene) {
 
     CreateZone(scene);
     CreateInstances(scene);
-    CreateBoundary(scene);
+    // CreateBoundary(scene);
 
     // print("done " + scene.name);
 
@@ -609,12 +568,10 @@ function ImportScene(scene) {
 clearAllNav();
 
 function clearAllNav() {
-    // print('NAV CLEARING ALL NAV');
     var result = Entities.findEntities(MyAvatar.position, 25000);
     result.forEach(function(r) {
         var properties = Entities.getEntityProperties(r, "name");
         if (properties.name.indexOf('navigation button') > -1) {
-            // print('NAV DELETING NAV BUTTON AT START:: '+r)
             Entities.deleteEntity(r);
         }
     })
@@ -645,9 +602,6 @@ function createLayoutLights() {
 }
 
 function CreateNavigationButton(scene, number) {
-    // print('NAV NAVIGATION CREATING NAV!!' +scene.name + " " + number)
-
-
     Entities.addEntity({
         type: "Box",
         name: scene.name + " navigation button",
@@ -818,7 +772,7 @@ function CreateInstances(scene) {
                     x: 0,
                     y: 0,
                     z: 0
-                }, idBounds, 150);
+                }, idBounds, 150, scene.instances[i]);
 
             }
             //print('SCRIPT AT CREATE ENTITY: ' + script)
@@ -831,6 +785,7 @@ function CreateInstances(scene) {
 
 function CreateIdentification(name, position, rotation, dimensions, showDistance) {
     //print ("creating ID for " + name);
+
     Entities.addEntity({
         type: "Sphere",
         name: "ID for " + name,
@@ -9045,4 +9000,9 @@ createLayoutLights();
 
 Script.scriptEnding.connect(function() {
     Entities.addingEntity.disconnect(makeUngrabbable);
-});
\ No newline at end of file
+});
+
+Script.setTimeout(function() {
+    print('JBP stopping cell science import');
+    Script.stop();
+}, 30000)
\ No newline at end of file
diff --git a/unpublishedScripts/DomainContent/CellScience/motorProteinControllerAC.js b/unpublishedScripts/DomainContent/CellScience/motorProteinControllerAC.js
index 672ec1fd92..59577d49ba 100644
--- a/unpublishedScripts/DomainContent/CellScience/motorProteinControllerAC.js
+++ b/unpublishedScripts/DomainContent/CellScience/motorProteinControllerAC.js
@@ -18,8 +18,6 @@ if (USE_LOCAL_HOST === true) {
 
 var USE_LOCAL_HOST = false;
 
-Agent.isAvatar = true;
-
 EntityViewer.setPosition({
     x: 3000,
     y: 13500,
diff --git a/unpublishedScripts/DomainContent/CellScience/moveCellsAC.js b/unpublishedScripts/DomainContent/CellScience/moveCellsAC.js
new file mode 100644
index 0000000000..cf35e081e0
--- /dev/null
+++ b/unpublishedScripts/DomainContent/CellScience/moveCellsAC.js
@@ -0,0 +1,103 @@
+//  Copyright 2016 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
+//
+
+var basePosition = {
+    x: 3000,
+    y: 13500,
+    z: 3000
+};
+
+var initialized = false;
+
+EntityViewer.setPosition(basePosition);
+EntityViewer.setKeyholeRadius(60000);
+var octreeQueryInterval = Script.setInterval(function() {
+    EntityViewer.queryOctree();
+}, 200);
+
+var THROTTLE = true;
+var THROTTLE_RATE = 5000;
+
+var sinceLastUpdate = 0;
+
+//print('cells script')
+
+function findCells() {
+    var results = Entities.findEntities(basePosition, 60000);
+
+    if (results.length === 0) {
+        //    print('no entities found')
+        return;
+    }
+
+    results.forEach(function(v) {
+        var name = Entities.getEntityProperties(v, 'name').name;
+        //  print('name is:: ' + name)
+        if (name === 'Cell') {
+            //   print('found a cell!!' + v)
+            Script.setTimeout(function() {
+                moveCell(v);
+            }, Math.random() * THROTTLE_RATE);
+        }
+    });
+}
+
+
+var minAngularVelocity = 0.01;
+var maxAngularVelocity = 0.03;
+
+function moveCell(entityId) {
+    //  print('moving a cell! ' + entityId)
+
+    var magnitudeAV = maxAngularVelocity;
+
+    var directionAV = {
+        x: Math.random() - 0.5,
+        y: Math.random() - 0.5,
+        z: Math.random() - 0.5
+    };
+    //  print("ROT magnitude is " + magnitudeAV + " and direction is " + directionAV.x);
+    Entities.editEntity(entityId, {
+        angularVelocity: Vec3.multiply(magnitudeAV, Vec3.normalize(directionAV))
+    });
+
+}
+
+function update(deltaTime) {
+
+    // print('deltaTime',deltaTime)
+    if (!initialized) {
+        print("checking for servers...");
+        if (Entities.serversExist() && Entities.canRez()) {
+            print("servers exist -- makeAll...");
+            Entities.setPacketsPerSecond(6000);
+            print("PPS:" + Entities.getPacketsPerSecond());
+            initialized = true;
+        }
+        return;
+    }
+
+    if (THROTTLE === true) {
+        sinceLastUpdate = sinceLastUpdate + deltaTime * 1000;
+        if (sinceLastUpdate > THROTTLE_RATE) {
+            //     print('SHOULD FIND CELLS!!!')
+            sinceLastUpdate = 0;
+            findCells();
+        } else {
+            // print('returning in update ' + sinceLastUpdate)
+            return;
+        }
+    }
+
+}
+
+function unload() {
+    Script.update.disconnect(update);
+}
+
+Script.update.connect(update);
+Script.scriptEnding.connect(unload);
\ No newline at end of file
diff --git a/unpublishedScripts/DomainContent/CellScience/moveVesiclesAC.js b/unpublishedScripts/DomainContent/CellScience/moveVesiclesAC.js
new file mode 100644
index 0000000000..922f0d94cf
--- /dev/null
+++ b/unpublishedScripts/DomainContent/CellScience/moveVesiclesAC.js
@@ -0,0 +1,108 @@
+//  Copyright 2016 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
+//
+
+var basePosition = {
+    x: 3000,
+    y: 13500,
+    z: 3000
+};
+
+var initialized = false;
+
+EntityViewer.setPosition(basePosition);
+EntityViewer.setKeyholeRadius(60000);
+var octreeQueryInterval = Script.setInterval(function() {
+    EntityViewer.queryOctree();
+}, 200);
+
+var THROTTLE = true;
+var THROTTLE_RATE = 5000;
+
+var sinceLastUpdate = 0;
+
+//print('vesicle script')
+
+function findVesicles() {
+    var results = Entities.findEntities(basePosition, 60000);
+
+    if (results.length === 0) {
+        // print('no entities found');
+        return;
+    }
+
+    results.forEach(function(v) {
+        var name = Entities.getEntityProperties(v, 'name').name;
+        if (name === 'vesicle') {
+            //print('found a vesicle!!' + v)
+            Script.setTimeout(function() {
+                moveVesicle(v);
+            }, Math.random() * THROTTLE_RATE);
+        }
+    });
+}
+
+var minVelocity = 1;
+var maxVelocity = 5;
+var minAngularVelocity = 0.01;
+var maxAngularVelocity = 0.03;
+
+function moveVesicle(entityId) {
+    // print('moving a vesicle! ' + entityId)
+    var magnitudeV = maxVelocity;
+    var directionV = {
+        x: Math.random() - 0.5,
+        y: Math.random() - 0.5,
+        z: Math.random() - 0.5
+    };
+
+    // print("POS magnitude is " + magnitudeV + " and direction is " + directionV.x);
+
+    var magnitudeAV = maxAngularVelocity;
+
+    var directionAV = {
+        x: Math.random() - 0.5,
+        y: Math.random() - 0.5,
+        z: Math.random() - 0.5
+    };
+    // print("ROT magnitude is " + magnitudeAV + " and direction is " + directionAV.x);
+    Entities.editEntity(entityId, {
+        velocity: Vec3.multiply(magnitudeV, Vec3.normalize(directionV)),
+        angularVelocity: Vec3.multiply(magnitudeAV, Vec3.normalize(directionAV))
+    });
+
+}
+
+function update(deltaTime) {
+    if (!initialized) {
+        print("checking for servers...");
+        if (Entities.serversExist() && Entities.canRez()) {
+            print("servers exist -- makeAll...");
+            Entities.setPacketsPerSecond(6000);
+            print("PPS:" + Entities.getPacketsPerSecond());
+            initialized = true;
+        }
+        return;
+    }
+
+    if (THROTTLE === true) {
+        sinceLastUpdate = sinceLastUpdate + deltaTime * 1000;
+        if (sinceLastUpdate > THROTTLE_RATE) {
+            sinceLastUpdate = 0;
+            findVesicles();
+        } else {
+            return;
+        }
+    }
+
+}
+
+function unload() {
+    Script.update.disconnect(update);
+}
+
+Script.update.connect(update);
+Script.scriptEnding.connect(unload);
\ No newline at end of file