diff --git a/libraries/entities-renderer/src/RenderableZoneEntityItem.cpp b/libraries/entities-renderer/src/RenderableZoneEntityItem.cpp
index e4c56dc419..d61e3c02f7 100644
--- a/libraries/entities-renderer/src/RenderableZoneEntityItem.cpp
+++ b/libraries/entities-renderer/src/RenderableZoneEntityItem.cpp
@@ -18,39 +18,77 @@ EntityItem* RenderableZoneEntityItem::factory(const EntityItemID& entityID, cons
     return new RenderableZoneEntityItem(entityID, properties);
 }
 
-bool RenderableZoneEntityItem::setProperties(const EntityItemProperties& properties) {
+template<typename Lambda>
+void RenderableZoneEntityItem::changeProperties(Lambda setNewProperties) {
     QString oldShapeURL = getCompoundShapeURL();
-    bool somethingChanged = ZoneEntityItem::setProperties(properties);
-    if (somethingChanged && oldShapeURL != getCompoundShapeURL()) {
-        _compoundShapeModel = DependencyManager::get<GeometryCache>()->getGeometry(getCompoundShapeURL(), QUrl(), true);
+    glm::vec3 oldPosition = getPosition(), oldDimensions = getDimensions();
+    glm::quat oldRotation = getRotation();
+    
+    setNewProperties();
+    
+    if (oldShapeURL != getCompoundShapeURL()) {
+        if (!_model) {
+            _model = getModel();
+            _needsInitialSimulation = true;
+        }
+        _model->setURL(getCompoundShapeURL(), QUrl(), true, true);
     }
+    if (oldPosition != getPosition() ||
+        oldRotation != getRotation() ||
+        oldDimensions != getDimensions()) {
+        _needsInitialSimulation = true;
+    }
+}
+
+bool RenderableZoneEntityItem::setProperties(const EntityItemProperties& properties) {
+    bool somethingChanged = false;
+    changeProperties([&]() {
+        somethingChanged = this->ZoneEntityItem::setProperties(properties);
+    });
     return somethingChanged;
 }
 
 int RenderableZoneEntityItem::readEntitySubclassDataFromBuffer(const unsigned char* data, int bytesLeftToRead,
                                                                 ReadBitstreamToTreeParams& args,
                                                                 EntityPropertyFlags& propertyFlags, bool overwriteLocalData) {
-    QString oldShapeURL = getCompoundShapeURL();
-    int bytesRead = ZoneEntityItem::readEntitySubclassDataFromBuffer(data, bytesLeftToRead,
-                                                                      args, propertyFlags, overwriteLocalData);
-    if (oldShapeURL != getCompoundShapeURL()) {
-        _compoundShapeModel = DependencyManager::get<GeometryCache>()->getGeometry(getCompoundShapeURL(), QUrl(), true);
-    }
+    int bytesRead = 0;
+    changeProperties([&]() {
+        bytesRead = ZoneEntityItem::readEntitySubclassDataFromBuffer(data, bytesLeftToRead,
+                                                                     args, propertyFlags, overwriteLocalData);
+    });
     return bytesRead;
 }
 
+Model* RenderableZoneEntityItem::getModel() {
+    Model* model = new Model();
+    model->init();
+    return model;
+}
+
+void RenderableZoneEntityItem::initialSimulation() {
+    _model->setScaleToFit(true, getDimensions());
+    _model->setSnapModelToRegistrationPoint(true, getRegistrationPoint());
+    _model->setRotation(getRotation());
+    _model->setTranslation(getPosition());
+    _model->simulate(0.0f);
+    _needsInitialSimulation = false;
+}
+
 bool RenderableZoneEntityItem::contains(const glm::vec3& point) const {
     if (getShapeType() != SHAPE_TYPE_COMPOUND) {
         return EntityItem::contains(point);
     }
-    if (!_compoundShapeModel && hasCompoundShapeURL()) {
-        const_cast<RenderableZoneEntityItem*>(this)->_compoundShapeModel = DependencyManager::get<GeometryCache>()->getGeometry(getCompoundShapeURL(), QUrl(), true);
+    
+    if (_model && !_model->isActive() && hasCompoundShapeURL()) {
+        // Since we have a delayload, we need to update the geometry if it has been downloaded
+        _model->setURL(getCompoundShapeURL(), QUrl(), true);
     }
     
-    if (EntityItem::contains(point) && _compoundShapeModel && _compoundShapeModel->isLoaded()) {
-        const FBXGeometry& geometry = _compoundShapeModel->getFBXGeometry();
-        glm::vec3 meshDimensions = geometry.getUnscaledMeshExtents().maximum - geometry.getUnscaledMeshExtents().minimum;
-        return geometry.convexHullContains(worldToEntity(point) * meshDimensions);
+    if (_model && _model->isActive() && EntityItem::contains(point)) {
+        if (_needsInitialSimulation) {
+            const_cast<RenderableZoneEntityItem*>(this)->initialSimulation();
+        }
+        return _model->convexHullContains(point);
     }
     
     return false;
diff --git a/libraries/entities-renderer/src/RenderableZoneEntityItem.h b/libraries/entities-renderer/src/RenderableZoneEntityItem.h
index 8d8d8b4b3f..8a75a048d1 100644
--- a/libraries/entities-renderer/src/RenderableZoneEntityItem.h
+++ b/libraries/entities-renderer/src/RenderableZoneEntityItem.h
@@ -12,6 +12,7 @@
 #ifndef hifi_RenderableZoneEntityItem_h
 #define hifi_RenderableZoneEntityItem_h
 
+#include <Model.h>
 #include <ZoneEntityItem.h>
 
 class NetworkGeometry;
@@ -21,7 +22,9 @@ public:
     static EntityItem* factory(const EntityItemID& entityID, const EntityItemProperties& properties);
     
     RenderableZoneEntityItem(const EntityItemID& entityItemID, const EntityItemProperties& properties) :
-    ZoneEntityItem(entityItemID, properties)
+    ZoneEntityItem(entityItemID, properties),
+    _model(NULL),
+    _needsInitialSimulation(true)
     { }
     
     virtual bool setProperties(const EntityItemProperties& properties);
@@ -32,8 +35,14 @@ public:
     virtual bool contains(const glm::vec3& point) const;
     
 private:
+    Model* getModel();
+    void initialSimulation();
     
-    QSharedPointer<NetworkGeometry> _compoundShapeModel;
+    template<typename Lambda>
+    void changeProperties(Lambda functor);
+    
+    Model* _model;
+    bool _needsInitialSimulation;
 };
 
 #endif // hifi_RenderableZoneEntityItem_h
\ No newline at end of file
diff --git a/libraries/render-utils/src/GeometryCache.h b/libraries/render-utils/src/GeometryCache.h
index 37156a6c71..8ccbb65dbb 100644
--- a/libraries/render-utils/src/GeometryCache.h
+++ b/libraries/render-utils/src/GeometryCache.h
@@ -324,7 +324,7 @@ public:
 
     const FBXGeometry& getFBXGeometry() const { return _geometry; }
     const QVector<NetworkMesh>& getMeshes() const { return _meshes; }
-//
+
     QVector<int> getJointMappings(const AnimationPointer& animation);
 
     virtual void setLoadPriority(const QPointer<QObject>& owner, float priority);
diff --git a/libraries/render-utils/src/Model.cpp b/libraries/render-utils/src/Model.cpp
index 0114bc65f0..7528d1db4d 100644
--- a/libraries/render-utils/src/Model.cpp
+++ b/libraries/render-utils/src/Model.cpp
@@ -573,6 +573,61 @@ bool Model::findRayIntersectionAgainstSubMeshes(const glm::vec3& origin, const g
     return intersectedSomething;
 }
 
+bool Model::convexHullContains(glm::vec3 point) {
+    // if we aren't active, we can't compute that yet...
+    if (!isActive()) {
+        return false;
+    }
+    
+    // extents is the entity relative, scaled, centered extents of the entity
+    glm::vec3 position = _translation;
+    glm::mat4 rotation = glm::mat4_cast(_rotation);
+    glm::mat4 translation = glm::translate(position);
+    glm::mat4 modelToWorldMatrix = translation * rotation;
+    glm::mat4 worldToModelMatrix = glm::inverse(modelToWorldMatrix);
+    
+    Extents modelExtents = getMeshExtents(); // NOTE: unrotated
+    
+    glm::vec3 dimensions = modelExtents.maximum - modelExtents.minimum;
+    glm::vec3 corner = -(dimensions * _registrationPoint);
+    AABox modelFrameBox(corner, dimensions);
+    
+    glm::vec3 modelFramePoint = glm::vec3(worldToModelMatrix * glm::vec4(point, 1.0f));
+    
+    // we can use the AABox's contains() by mapping our point into the model frame
+    // and testing there.
+    if (modelFrameBox.contains(modelFramePoint)){
+        if (!_calculatedMeshTrianglesValid) {
+            recalculateMeshBoxes(true);
+        }
+        
+        // If we are inside the models box, then consider the submeshes...
+        int subMeshIndex = 0;
+        foreach(const AABox& subMeshBox, _calculatedMeshBoxes) {
+            if (subMeshBox.contains(point)) {
+                bool insideMesh = true;
+                // To be inside the sub mesh, we need to be behind every triangles' planes
+                const QVector<Triangle>& meshTriangles = _calculatedMeshTriangles[subMeshIndex];
+                foreach (const Triangle& triangle, meshTriangles) {
+                    if (!isPointBehindTrianglesPlane(point, triangle.v0, triangle.v1, triangle.v2)) {
+                        // it's not behind at least one so we bail
+                        insideMesh = false;
+                        break;
+                    }
+                    
+                }
+                if (insideMesh) {
+                    // It's inside this mesh, return true.
+                    return true;
+                }
+            }
+            subMeshIndex++;
+        }
+    }
+    // It wasn't in any mesh, return false.
+    return false;
+}
+
 // TODO: we seem to call this too often when things haven't actually changed... look into optimizing this
 void Model::recalculateMeshBoxes(bool pickAgainstTriangles) {
     bool calculatedMeshTrianglesNeeded = pickAgainstTriangles && !_calculatedMeshTrianglesValid;
@@ -1047,7 +1102,7 @@ int Model::getLastFreeJointIndex(int jointIndex) const {
 
 void Model::setURL(const QUrl& url, const QUrl& fallback, bool retainCurrent, bool delayLoad) {
     // don't recreate the geometry if it's the same URL
-    if (_url == url) {
+    if (_url == url && _geometry && _geometry->getURL() == url) {
         return;
     }
     _url = url;
diff --git a/libraries/render-utils/src/Model.h b/libraries/render-utils/src/Model.h
index b91d2116f8..dba8f5277f 100644
--- a/libraries/render-utils/src/Model.h
+++ b/libraries/render-utils/src/Model.h
@@ -213,6 +213,7 @@ public:
 
     bool findRayIntersectionAgainstSubMeshes(const glm::vec3& origin, const glm::vec3& direction, float& distance, 
                                                 BoxFace& face, QString& extraInfo, bool pickAgainstTriangles = false);
+    bool convexHullContains(glm::vec3 point);
 
 protected:
     QSharedPointer<NetworkGeometry> _geometry;