diff --git a/assignment-client/src/Agent.cpp b/assignment-client/src/Agent.cpp
index 1df901dd98..0b373e511b 100644
--- a/assignment-client/src/Agent.cpp
+++ b/assignment-client/src/Agent.cpp
@@ -548,16 +548,21 @@ void Agent::setIsAvatar(bool isAvatar) {
     if (_isAvatar && !_avatarIdentityTimer) {
         // set up the avatar timers
         _avatarIdentityTimer = new QTimer(this);
+        _avatarViewTimer = new QTimer(this);
 
         // connect our slot
         connect(_avatarIdentityTimer, &QTimer::timeout, this, &Agent::sendAvatarIdentityPacket);
+        connect(_avatarViewTimer, &QTimer::timeout, this, &Agent::sendAvatarViewFrustum);
+
+        static const int AVATAR_IDENTITY_PACKET_SEND_INTERVAL_MSECS = 1000;
+        static const int AVATAR_VIEW_PACKET_SEND_INTERVAL_MSECS = 1000;
 
         // start the timers
         _avatarIdentityTimer->start(AVATAR_IDENTITY_PACKET_SEND_INTERVAL_MSECS);  // FIXME - we shouldn't really need to constantly send identity packets
+        _avatarViewTimer->start(AVATAR_VIEW_PACKET_SEND_INTERVAL_MSECS);
 
         // tell the avatarAudioTimer to start ticking
         QMetaObject::invokeMethod(&_avatarAudioTimer, "start");
-
     }
 
     if (!_isAvatar) {
@@ -567,6 +572,10 @@ void Agent::setIsAvatar(bool isAvatar) {
             delete _avatarIdentityTimer;
             _avatarIdentityTimer = nullptr;
 
+            _avatarViewTimer->stop();
+            delete _avatarViewTimer;
+            _avatarViewTimer = nullptr;
+
             // The avatar mixer never times out a connection (e.g., based on identity or data packets)
             // but rather keeps avatars in its list as long as "connected". As a result, clients timeout
             // when we stop sending identity, but then get woken up again by the mixer itself, which sends
@@ -585,6 +594,7 @@ void Agent::setIsAvatar(bool isAvatar) {
                 nodeList->sendPacket(std::move(packet), *node);
             });
         }
+
         QMetaObject::invokeMethod(&_avatarAudioTimer, "stop");
     }
 }
@@ -597,6 +607,25 @@ void Agent::sendAvatarIdentityPacket() {
     }
 }
 
+void Agent::sendAvatarViewFrustum() {
+    auto scriptedAvatar = DependencyManager::get<ScriptableAvatar>();
+
+    ViewFrustum view;
+    view.setPosition(scriptedAvatar->getWorldPosition());
+    view.setOrientation(scriptedAvatar->getHeadOrientation());
+    view.calculate();
+
+    uint8_t numFrustums = 1;
+    auto viewFrustumByteArray = view.toByteArray();
+
+    auto avatarPacket = NLPacket::create(PacketType::ViewFrustum, viewFrustumByteArray.size() + sizeof(numFrustums));
+    avatarPacket->writePrimitive(numFrustums);
+    avatarPacket->write(viewFrustumByteArray);
+
+    DependencyManager::get<NodeList>()->broadcastToNodes(std::move(avatarPacket),
+                                                         { NodeType::AvatarMixer });
+}
+
 void Agent::processAgentAvatar() {
     if (!_scriptEngine->isFinished() && _isAvatar) {
         auto scriptedAvatar = DependencyManager::get<ScriptableAvatar>();
diff --git a/assignment-client/src/Agent.h b/assignment-client/src/Agent.h
index 1229f06276..d144f0bc01 100644
--- a/assignment-client/src/Agent.h
+++ b/assignment-client/src/Agent.h
@@ -97,6 +97,7 @@ private:
     void setAvatarSound(SharedSoundPointer avatarSound) { _avatarSound = avatarSound; }
 
     void sendAvatarIdentityPacket();
+    void sendAvatarViewFrustum();
 
     QString _scriptContents;
     QTimer* _scriptRequestTimeout { nullptr };
@@ -106,6 +107,7 @@ private:
     int _numAvatarSoundSentBytes = 0;
     bool _isAvatar = false;
     QTimer* _avatarIdentityTimer = nullptr;
+    QTimer* _avatarViewTimer = nullptr;
     QHash<QUuid, quint16> _outgoingScriptAudioSequenceNumbers;
 
     AudioGate _audioGate;
diff --git a/assignment-client/src/avatars/AvatarMixer.cpp b/assignment-client/src/avatars/AvatarMixer.cpp
index 29340f6474..6353a1664f 100644
--- a/assignment-client/src/avatars/AvatarMixer.cpp
+++ b/assignment-client/src/avatars/AvatarMixer.cpp
@@ -521,11 +521,9 @@ void AvatarMixer::handleViewFrustumPacket(QSharedPointer<ReceivedMessage> messag
     auto start = usecTimestampNow();
     getOrCreateClientData(senderNode);
 
-    if (senderNode->getLinkedData()) {
-        AvatarMixerClientData* nodeData = dynamic_cast<AvatarMixerClientData*>(senderNode->getLinkedData());
-        if (nodeData != nullptr) {
-            nodeData->readViewFrustumPacket(message->getMessage());
-        }
+    AvatarMixerClientData* nodeData = dynamic_cast<AvatarMixerClientData*>(senderNode->getLinkedData());
+    if (nodeData) {
+        nodeData->readViewFrustumPacket(message->getMessage());
     }
 
     auto end = usecTimestampNow();
diff --git a/assignment-client/src/avatars/AvatarMixerClientData.cpp b/assignment-client/src/avatars/AvatarMixerClientData.cpp
index 268aba62d6..a8e5a7c541 100644
--- a/assignment-client/src/avatars/AvatarMixerClientData.cpp
+++ b/assignment-client/src/avatars/AvatarMixerClientData.cpp
@@ -19,8 +19,6 @@
 AvatarMixerClientData::AvatarMixerClientData(const QUuid& nodeID) :
     NodeData(nodeID)
 {
-    _currentViewFrustum.invalidate();
-
     // in case somebody calls getSessionUUID on the AvatarData instance, make sure it has the right ID
     _avatar->setID(nodeID);
 }
@@ -128,12 +126,27 @@ void AvatarMixerClientData::removeFromRadiusIgnoringSet(SharedNodePointer self,
     }
 }
 
-void AvatarMixerClientData::readViewFrustumPacket(const QByteArray& message) {
-    _currentViewFrustum.fromByteArray(message);
+void AvatarMixerClientData::readViewFrustumPacket(QByteArray message) {
+    _currentViewFrustums.clear();
+    
+    uint8_t numFrustums = 0;
+    memcpy(&numFrustums, message.constData(), sizeof(numFrustums));
+    message.remove(0, sizeof(numFrustums));
+
+    for (uint8_t i = 0; i < numFrustums; ++i) {
+        ViewFrustum frustum;
+        auto bytesRead = frustum.fromByteArray(message);
+        message.remove(0, bytesRead);
+
+        _currentViewFrustums.push_back(frustum);
+    }
 }
 
 bool AvatarMixerClientData::otherAvatarInView(const AABox& otherAvatarBox) {
-    return _currentViewFrustum.boxIntersectsKeyhole(otherAvatarBox);
+    return std::any_of(std::begin(_currentViewFrustums), std::end(_currentViewFrustums),
+                       [&](const ViewFrustum& viewFrustum) {
+        return viewFrustum.boxIntersectsKeyhole(otherAvatarBox);
+    });
 }
 
 void AvatarMixerClientData::loadJSONStats(QJsonObject& jsonObject) const {
diff --git a/assignment-client/src/avatars/AvatarMixerClientData.h b/assignment-client/src/avatars/AvatarMixerClientData.h
index 6963f4df0d..f17404b79f 100644
--- a/assignment-client/src/avatars/AvatarMixerClientData.h
+++ b/assignment-client/src/avatars/AvatarMixerClientData.h
@@ -98,7 +98,7 @@ public:
     void removeFromRadiusIgnoringSet(SharedNodePointer self, const QUuid& other);
     void ignoreOther(SharedNodePointer self, SharedNodePointer other);
 
-    void readViewFrustumPacket(const QByteArray& message);
+    void readViewFrustumPacket(QByteArray message);
 
     bool otherAvatarInView(const AABox& otherAvatarBox);
 
@@ -110,7 +110,7 @@ public:
     bool getRequestsDomainListData() { return _requestsDomainListData; }
     void setRequestsDomainListData(bool requesting) { _requestsDomainListData = requesting; }
 
-    ViewFrustum getViewFrustum() const { return _currentViewFrustum; }
+    const ViewFrustums& getViewFrustums() const { return _currentViewFrustums; }
 
     uint64_t getLastOtherAvatarEncodeTime(QUuid otherAvatar) const;
     void setLastOtherAvatarEncodeTime(const QUuid& otherAvatar, uint64_t time);
@@ -150,7 +150,7 @@ private:
 
     SimpleMovingAverage _avgOtherAvatarDataRate;
     std::unordered_set<QUuid> _radiusIgnoredOthers;
-    ViewFrustum _currentViewFrustum;
+    ViewFrustums _currentViewFrustums;
 
     int _recentOtherAvatarsInView { 0 };
     int _recentOtherAvatarsOutOfView { 0 };
diff --git a/assignment-client/src/avatars/AvatarMixerSlave.cpp b/assignment-client/src/avatars/AvatarMixerSlave.cpp
index 6f19b73cc5..30d94ed772 100644
--- a/assignment-client/src/avatars/AvatarMixerSlave.cpp
+++ b/assignment-client/src/avatars/AvatarMixerSlave.cpp
@@ -222,8 +222,8 @@ void AvatarMixerSlave::broadcastAvatarDataToAgent(const SharedNodePointer& node)
     };
 
     // prepare to sort
-    ViewFrustum cameraView = nodeData->getViewFrustum();
-    PrioritySortUtil::PriorityQueue<SortableAvatar> sortedAvatars(cameraView,
+    const auto& cameraViews = nodeData->getViewFrustums();
+    PrioritySortUtil::PriorityQueue<SortableAvatar> sortedAvatars(cameraViews,
             AvatarData::_avatarSortCoefficientSize,
             AvatarData::_avatarSortCoefficientCenter,
             AvatarData::_avatarSortCoefficientAge);
diff --git a/assignment-client/src/entities/EntityPriorityQueue.cpp b/assignment-client/src/entities/EntityPriorityQueue.cpp
index 999a05f2e2..88dee58f9d 100644
--- a/assignment-client/src/entities/EntityPriorityQueue.cpp
+++ b/assignment-client/src/entities/EntityPriorityQueue.cpp
@@ -15,7 +15,7 @@ const float PrioritizedEntity::DO_NOT_SEND = -1.0e-6f;
 const float PrioritizedEntity::FORCE_REMOVE = -1.0e-5f;
 const float PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY = 1.0f;
 
-void ConicalView::set(const ViewFrustum& viewFrustum) {
+void ConicalViewFrustum::set(const ViewFrustum& viewFrustum) {
     // The ConicalView has two parts: a central sphere (same as ViewFrustum) and a circular cone that bounds the frustum part.
     // Why?  Because approximate intersection tests are much faster to compute for a cone than for a frustum.
     _position = viewFrustum.getPosition();
@@ -31,7 +31,7 @@ void ConicalView::set(const ViewFrustum& viewFrustum) {
     _radius = viewFrustum.getCenterRadius();
 }
 
-float ConicalView::computePriority(const AACube& cube) const {
+float ConicalViewFrustum::computePriority(const AACube& cube) const {
     glm::vec3 p = cube.calcCenter() - _position; // position of bounding sphere in view-frame
     float d = glm::length(p); // distance to center of bounding sphere
     float r = 0.5f * cube.getScale(); // radius of bounding sphere
@@ -51,3 +51,26 @@ float ConicalView::computePriority(const AACube& cube) const {
     }
     return PrioritizedEntity::DO_NOT_SEND;
 }
+
+
+void ConicalView::set(const DiffTraversal::View& view) {
+    auto size = view.viewFrustums.size();
+    _conicalViewFrustums.resize(size);
+    for (size_t i = 0; i < size; ++i) {
+        _conicalViewFrustums[i].set(view.viewFrustums[i]);
+    }
+}
+
+float ConicalView::computePriority(const AACube& cube) const {
+    if (_conicalViewFrustums.empty()) {
+        return PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY;
+    }
+
+    float priority = PrioritizedEntity::DO_NOT_SEND;
+
+    for (const auto& view : _conicalViewFrustums) {
+        priority = std::max(priority, view.computePriority(cube));
+    }
+
+    return priority;
+}
diff --git a/assignment-client/src/entities/EntityPriorityQueue.h b/assignment-client/src/entities/EntityPriorityQueue.h
index e308d9b549..9210ac549f 100644
--- a/assignment-client/src/entities/EntityPriorityQueue.h
+++ b/assignment-client/src/entities/EntityPriorityQueue.h
@@ -13,18 +13,20 @@
 #define hifi_EntityPriorityQueue_h
 
 #include <queue>
+#include <unordered_set>
 
 #include <AACube.h>
+#include <DiffTraversal.h>
 #include <EntityTreeElement.h>
 
 const float SQRT_TWO_OVER_TWO = 0.7071067811865f;
 const float DEFAULT_VIEW_RADIUS = 10.0f;
 
-// ConicalView is an approximation of a ViewFrustum for fast calculation of sort priority.
-class ConicalView {
+// ConicalViewFrustum is an approximation of a ViewFrustum for fast calculation of sort priority.
+class ConicalViewFrustum {
 public:
-    ConicalView() {}
-    ConicalView(const ViewFrustum& viewFrustum) { set(viewFrustum); }
+    ConicalViewFrustum() {}
+    ConicalViewFrustum(const ViewFrustum& viewFrustum) { set(viewFrustum); }
     void set(const ViewFrustum& viewFrustum);
     float computePriority(const AACube& cube) const;
 private:
@@ -35,6 +37,16 @@ private:
     float _radius { DEFAULT_VIEW_RADIUS };
 };
 
+// Simple wrapper around a set of conical view frustums
+class ConicalView {
+public:
+    ConicalView() {}
+    void set(const DiffTraversal::View& view);
+    float computePriority(const AACube& cube) const;
+private:
+    std::vector<ConicalViewFrustum> _conicalViewFrustums;
+};
+
 // PrioritizedEntity is a placeholder in a sorted queue.
 class PrioritizedEntity {
 public:
@@ -61,6 +73,50 @@ private:
     bool _forceRemove;
 };
 
-using EntityPriorityQueue = std::priority_queue< PrioritizedEntity, std::vector<PrioritizedEntity>, PrioritizedEntity::Compare >;
+class EntityPriorityQueue {
+public:
+    inline bool empty() const {
+        assert(_queue.empty() == _entities.empty());
+        return _queue.empty();
+    }
+
+    inline const PrioritizedEntity& top() const {
+        assert(!_queue.empty());
+        return _queue.top();
+    }
+
+    inline bool contains(const EntityItem* entity) const {
+        return _entities.find(entity) != std::end(_entities);
+    }
+
+    inline void emplace(const EntityItemPointer& entity, float priority, bool forceRemove = false) {
+        assert(entity && !contains(entity.get()));
+        _queue.emplace(entity, priority, forceRemove);
+        _entities.insert(entity.get());
+        assert(_queue.size() == _entities.size());
+    }
+
+    inline void pop() {
+        assert(!empty());
+        _entities.erase(_queue.top().getRawEntityPointer());
+        _queue.pop();
+        assert(_queue.size() == _entities.size());
+    }
+
+    inline void swap(EntityPriorityQueue& other) {
+        std::swap(_queue, other._queue);
+        std::swap(_entities, other._entities);
+    }
+
+private:
+    using PriorityQueue = std::priority_queue<PrioritizedEntity,
+                                              std::vector<PrioritizedEntity>,
+                                              PrioritizedEntity::Compare>;
+
+    PriorityQueue _queue;
+    // Keep dictionary of all the entities in the queue for fast contain checks.
+    std::unordered_set<const EntityItem*> _entities;
+
+};
 
 #endif // hifi_EntityPriorityQueue_h
diff --git a/assignment-client/src/entities/EntityTreeSendThread.cpp b/assignment-client/src/entities/EntityTreeSendThread.cpp
index 4aa52922c0..2e57f2e00f 100644
--- a/assignment-client/src/entities/EntityTreeSendThread.cpp
+++ b/assignment-client/src/entities/EntityTreeSendThread.cpp
@@ -103,48 +103,58 @@ void EntityTreeSendThread::preDistributionProcessing() {
 void EntityTreeSendThread::traverseTreeAndSendContents(SharedNodePointer node, OctreeQueryNode* nodeData,
             bool viewFrustumChanged, bool isFullScene) {
     if (viewFrustumChanged || _traversal.finished()) {
-        ViewFrustum viewFrustum;
-        nodeData->copyCurrentViewFrustum(viewFrustum);
         EntityTreeElementPointer root = std::dynamic_pointer_cast<EntityTreeElement>(_myServer->getOctree()->getRoot());
+
+
+        DiffTraversal::View newView;
+
+        ViewFrustum viewFrustum;
+        if (nodeData->hasMainViewFrustum()) {
+            nodeData->copyCurrentMainViewFrustum(viewFrustum);
+            newView.viewFrustums.push_back(viewFrustum);
+        }
+        if (nodeData->hasSecondaryViewFrustum()) {
+            nodeData->copyCurrentSecondaryViewFrustum(viewFrustum);
+            newView.viewFrustums.push_back(viewFrustum);
+        }
+
         int32_t lodLevelOffset = nodeData->getBoundaryLevelAdjust() + (viewFrustumChanged ? LOW_RES_MOVING_ADJUST : NO_BOUNDARY_ADJUST);
-        startNewTraversal(viewFrustum, root, lodLevelOffset, nodeData->getUsesFrustum());
+        newView.lodScaleFactor = powf(2.0f, lodLevelOffset);
+
+        startNewTraversal(newView, root);
 
         // When the viewFrustum changed the sort order may be incorrect, so we re-sort
         // and also use the opportunity to cull anything no longer in view
         if (viewFrustumChanged && !_sendQueue.empty()) {
             EntityPriorityQueue prevSendQueue;
-            _sendQueue.swap(prevSendQueue);
-            _entitiesInQueue.clear();
+            std::swap(_sendQueue, prevSendQueue);
+            assert(_sendQueue.empty());
+
             // Re-add elements from previous traversal if they still need to be sent
-            float lodScaleFactor = _traversal.getCurrentLODScaleFactor();
-            glm::vec3 viewPosition = _traversal.getCurrentView().getPosition();
             while (!prevSendQueue.empty()) {
                 EntityItemPointer entity = prevSendQueue.top().getEntity();
                 bool forceRemove = prevSendQueue.top().shouldForceRemove();
                 prevSendQueue.pop();
                 if (entity) {
-                    if (!forceRemove) {
+                    float priority = PrioritizedEntity::DO_NOT_SEND;
+
+                    if (forceRemove) {
+                        priority = PrioritizedEntity::FORCE_REMOVE;
+                    } else {
                         bool success = false;
                         AACube cube = entity->getQueryAACube(success);
                         if (success) {
-                            if (_traversal.getCurrentView().cubeIntersectsKeyhole(cube)) {
-                                float priority = _conicalView.computePriority(cube);
-                                if (priority != PrioritizedEntity::DO_NOT_SEND) {
-                                    float distance = glm::distance(cube.calcCenter(), viewPosition) + MIN_VISIBLE_DISTANCE;
-                                    float angularDiameter = cube.getScale() / distance;
-                                    if (angularDiameter > MIN_ENTITY_ANGULAR_DIAMETER * lodScaleFactor) {
-                                        _sendQueue.push(PrioritizedEntity(entity, priority));
-                                        _entitiesInQueue.insert(entity.get());
-                                    }
-                                }
+                            const auto& view = _traversal.getCurrentView();
+                            if (view.intersects(cube) && view.isBigEnough(cube)) {
+                                priority = _conicalView.computePriority(cube);
                             }
                         } else {
-                            _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY));
-                            _entitiesInQueue.insert(entity.get());
+                            priority = PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY;
                         }
-                    } else {
-                        _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::FORCE_REMOVE, true));
-                        _entitiesInQueue.insert(entity.get());
+                    }
+
+                    if (priority != PrioritizedEntity::DO_NOT_SEND) {
+                        _sendQueue.emplace(entity, priority, forceRemove);
                     }
                 }
             }
@@ -215,10 +225,9 @@ bool EntityTreeSendThread::addDescendantsToExtraFlaggedEntities(const QUuid& fil
     return hasNewChild || hasNewDescendants;
 }
 
-void EntityTreeSendThread::startNewTraversal(const ViewFrustum& view, EntityTreeElementPointer root, int32_t lodLevelOffset, 
-        bool usesViewFrustum) {
+void EntityTreeSendThread::startNewTraversal(const DiffTraversal::View& view, EntityTreeElementPointer root) {
 
-    DiffTraversal::Type type = _traversal.prepareNewTraversal(view, root, lodLevelOffset, usesViewFrustum);
+    DiffTraversal::Type type = _traversal.prepareNewTraversal(view, root);
     // there are three types of traversal:
     //
     //      (1) FirstTime = at login --> find everything in view
@@ -236,161 +245,114 @@ void EntityTreeSendThread::startNewTraversal(const ViewFrustum& view, EntityTree
         case DiffTraversal::First:
             // When we get to a First traversal, clear the _knownState
             _knownState.clear();
-            if (usesViewFrustum) {
-                float lodScaleFactor = _traversal.getCurrentLODScaleFactor();
-                glm::vec3 viewPosition = _traversal.getCurrentView().getPosition();
-                _traversal.setScanCallback([=](DiffTraversal::VisibleElement& next) {
-                    next.element->forEachEntity([=](EntityItemPointer entity) {
-                        // Bail early if we've already checked this entity this frame
-                        if (_entitiesInQueue.find(entity.get()) != _entitiesInQueue.end()) {
-                            return;
-                        }
-                        bool success = false;
-                        AACube cube = entity->getQueryAACube(success);
-                        if (success) {
-                            if (_traversal.getCurrentView().cubeIntersectsKeyhole(cube)) {
-                                // Check the size of the entity, it's possible that a "too small to see" entity is included in a
-                                // larger octree cell because of its position (for example if it crosses the boundary of a cell it
-                                // pops to the next higher cell. So we want to check to see that the entity is large enough to be seen
-                                // before we consider including it.
-                                float distance = glm::distance(cube.calcCenter(), viewPosition) + MIN_VISIBLE_DISTANCE;
-                                float angularDiameter = cube.getScale() / distance;
-                                if (angularDiameter > MIN_ENTITY_ANGULAR_DIAMETER * lodScaleFactor) {
-                                    float priority = _conicalView.computePriority(cube);
-                                    _sendQueue.push(PrioritizedEntity(entity, priority));
-                                    _entitiesInQueue.insert(entity.get());
-                                }
-                            }
-                        } else {
-                            _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY));
-                            _entitiesInQueue.insert(entity.get());
-                        }
-                    });
-                });
-            } else {
-                _traversal.setScanCallback([this](DiffTraversal::VisibleElement& next) {
-                    next.element->forEachEntity([this](EntityItemPointer entity) {
-                        // Bail early if we've already checked this entity this frame
-                        if (_entitiesInQueue.find(entity.get()) != _entitiesInQueue.end()) {
-                            return;
-                        }
-                        _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY));
-                        _entitiesInQueue.insert(entity.get());
-                    });
-                });
-            }
-            break;
-        case DiffTraversal::Repeat:
-            if (usesViewFrustum) {
-                float lodScaleFactor = _traversal.getCurrentLODScaleFactor();
-                glm::vec3 viewPosition = _traversal.getCurrentView().getPosition();
-                _traversal.setScanCallback([=](DiffTraversal::VisibleElement& next) {
-                    uint64_t startOfCompletedTraversal = _traversal.getStartOfCompletedTraversal();
-                    if (next.element->getLastChangedContent() > startOfCompletedTraversal) {
-                        next.element->forEachEntity([=](EntityItemPointer entity) {
-                            // Bail early if we've already checked this entity this frame
-                            if (_entitiesInQueue.find(entity.get()) != _entitiesInQueue.end()) {
-                                return;
-                            }
-                            auto knownTimestamp = _knownState.find(entity.get());
-                            if (knownTimestamp == _knownState.end()) {
-                                bool success = false;
-                                AACube cube = entity->getQueryAACube(success);
-                                if (success) {
-                                    if (next.intersection == ViewFrustum::INSIDE || _traversal.getCurrentView().cubeIntersectsKeyhole(cube)) {
-                                        // See the DiffTraversal::First case for an explanation of the "entity is too small" check
-                                        float distance = glm::distance(cube.calcCenter(), viewPosition) + MIN_VISIBLE_DISTANCE;
-                                        float angularDiameter = cube.getScale() / distance;
-                                        if (angularDiameter > MIN_ENTITY_ANGULAR_DIAMETER * lodScaleFactor) {
-                                            float priority = _conicalView.computePriority(cube);
-                                            _sendQueue.push(PrioritizedEntity(entity, priority));
-                                            _entitiesInQueue.insert(entity.get());
-                                        }
-                                    }
-                                } else {
-                                    _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY));
-                                    _entitiesInQueue.insert(entity.get());
-                                }
-                            } else if (entity->getLastEdited() > knownTimestamp->second
-                                    || entity->getLastChangedOnServer() > knownTimestamp->second) {
-                                // it is known and it changed --> put it on the queue with any priority
-                                // TODO: sort these correctly
-                                _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY));
-                                _entitiesInQueue.insert(entity.get());
-                            }
-                        });
-                    }
-                });
-            } else {
-                _traversal.setScanCallback([this](DiffTraversal::VisibleElement& next) {
-                    uint64_t startOfCompletedTraversal = _traversal.getStartOfCompletedTraversal();
-                    if (next.element->getLastChangedContent() > startOfCompletedTraversal) {
-                        next.element->forEachEntity([this](EntityItemPointer entity) {
-                            // Bail early if we've already checked this entity this frame
-                            if (_entitiesInQueue.find(entity.get()) != _entitiesInQueue.end()) {
-                                return;
-                            }
-                            auto knownTimestamp = _knownState.find(entity.get());
-                            if (knownTimestamp == _knownState.end()
-                                    || entity->getLastEdited() > knownTimestamp->second
-                                    || entity->getLastChangedOnServer() > knownTimestamp->second) {
-                                _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY));
-                                _entitiesInQueue.insert(entity.get());
-                            }
-                        });
-                    }
-                });
-            }
-            break;
-        case DiffTraversal::Differential:
-            assert(usesViewFrustum);
-            float lodScaleFactor = _traversal.getCurrentLODScaleFactor();
-            glm::vec3 viewPosition = _traversal.getCurrentView().getPosition();
-            float completedLODScaleFactor = _traversal.getCompletedLODScaleFactor();
-            glm::vec3 completedViewPosition = _traversal.getCompletedView().getPosition();
-            _traversal.setScanCallback([=] (DiffTraversal::VisibleElement& next) {
-                next.element->forEachEntity([=](EntityItemPointer entity) {
+            _traversal.setScanCallback([this](DiffTraversal::VisibleElement& next) {
+                next.element->forEachEntity([&](EntityItemPointer entity) {
                     // Bail early if we've already checked this entity this frame
-                    if (_entitiesInQueue.find(entity.get()) != _entitiesInQueue.end()) {
+                    if (_sendQueue.contains(entity.get())) {
                         return;
                     }
+                    float priority = PrioritizedEntity::DO_NOT_SEND;
+
+
+                    bool success = false;
+                    AACube cube = entity->getQueryAACube(success);
+                    if (success) {
+                        const auto& view = _traversal.getCurrentView();
+                        // Check the size of the entity, it's possible that a "too small to see" entity is included in a
+                        // larger octree cell because of its position (for example if it crosses the boundary of a cell it
+                        // pops to the next higher cell. So we want to check to see that the entity is large enough to be seen
+                        // before we consider including it.
+                        if ((next.intersection == ViewFrustum::INSIDE || view.intersects(cube)) &&
+                            view.isBigEnough(cube)) {
+                            priority = _conicalView.computePriority(cube);
+                        }
+                    } else {
+                        priority = PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY;
+                    }
+
+
+                    if (priority != PrioritizedEntity::DO_NOT_SEND) {
+                        _sendQueue.emplace(entity, priority);
+                    }
+                });
+            });
+            break;
+        case DiffTraversal::Repeat:
+            _traversal.setScanCallback([this](DiffTraversal::VisibleElement& next) {
+                uint64_t startOfCompletedTraversal = _traversal.getStartOfCompletedTraversal();
+                if (next.element->getLastChangedContent() > startOfCompletedTraversal) {
+                    next.element->forEachEntity([&](EntityItemPointer entity) {
+                        // Bail early if we've already checked this entity this frame
+                        if (_sendQueue.contains(entity.get())) {
+                            return;
+                        }
+                        float priority = PrioritizedEntity::DO_NOT_SEND;
+
+
+                        auto knownTimestamp = _knownState.find(entity.get());
+                        if (knownTimestamp == _knownState.end()) {
+                            bool success = false;
+                            AACube cube = entity->getQueryAACube(success);
+                            if (success) {
+                                const auto& view = _traversal.getCurrentView();
+                                // See the DiffTraversal::First case for an explanation of the "entity is too small" check
+                                if ((next.intersection == ViewFrustum::INSIDE || view.intersects(cube)) &&
+                                    view.isBigEnough(cube)) {
+                                    priority = _conicalView.computePriority(cube);
+                                }
+                            } else {
+                                priority = PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY;
+                            }
+                        } else if (entity->getLastEdited() > knownTimestamp->second ||
+                                   entity->getLastChangedOnServer() > knownTimestamp->second) {
+                            // it is known and it changed --> put it on the queue with any priority
+                            // TODO: sort these correctly
+                            priority = PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY;
+                        }
+
+
+                        if (priority != PrioritizedEntity::DO_NOT_SEND) {
+                            _sendQueue.emplace(entity, priority);
+                        }
+                    });
+                }
+            });
+            break;
+        case DiffTraversal::Differential:
+            assert(view.usesViewFrustums());
+            _traversal.setScanCallback([this] (DiffTraversal::VisibleElement& next) {
+                next.element->forEachEntity([&](EntityItemPointer entity) {
+                    // Bail early if we've already checked this entity this frame
+                    if (_sendQueue.contains(entity.get())) {
+                        return;
+                    }
+                    float priority = PrioritizedEntity::DO_NOT_SEND;
+
+
                     auto knownTimestamp = _knownState.find(entity.get());
                     if (knownTimestamp == _knownState.end()) {
                         bool success = false;
                         AACube cube = entity->getQueryAACube(success);
                         if (success) {
-                            if (_traversal.getCurrentView().cubeIntersectsKeyhole(cube)) {
-                                // See the DiffTraversal::First case for an explanation of the "entity is too small" check
-                                float distance = glm::distance(cube.calcCenter(), viewPosition) + MIN_VISIBLE_DISTANCE;
-                                float angularDiameter = cube.getScale() / distance;
-                                if (angularDiameter > MIN_ENTITY_ANGULAR_DIAMETER * lodScaleFactor) {
-                                    if (!_traversal.getCompletedView().cubeIntersectsKeyhole(cube)) {
-                                        float priority = _conicalView.computePriority(cube);
-                                        _sendQueue.push(PrioritizedEntity(entity, priority));
-                                        _entitiesInQueue.insert(entity.get());
-                                    } else {
-                                        // If this entity was skipped last time because it was too small, we still need to send it
-                                        distance = glm::distance(cube.calcCenter(), completedViewPosition) + MIN_VISIBLE_DISTANCE;
-                                        angularDiameter = cube.getScale() / distance;
-                                        if (angularDiameter <= MIN_ENTITY_ANGULAR_DIAMETER * completedLODScaleFactor) {
-                                            // this object was skipped in last completed traversal
-                                            float priority = _conicalView.computePriority(cube);
-                                            _sendQueue.push(PrioritizedEntity(entity, priority));
-                                            _entitiesInQueue.insert(entity.get());
-                                        }
-                                    }
-                                }
+                            const auto& view = _traversal.getCurrentView();
+                            // See the DiffTraversal::First case for an explanation of the "entity is too small" check
+                            if ((next.intersection == ViewFrustum::INSIDE || view.intersects(cube)) &&
+                                view.isBigEnough(cube)) {
+                                    priority = _conicalView.computePriority(cube);
                             }
                         } else {
-                            _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY));
-                            _entitiesInQueue.insert(entity.get());
+                            priority = PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY;
                         }
-                    } else if (entity->getLastEdited() > knownTimestamp->second
-                            || entity->getLastChangedOnServer() > knownTimestamp->second) {
+                    } else if (entity->getLastEdited() > knownTimestamp->second ||
+                               entity->getLastChangedOnServer() > knownTimestamp->second) {
                         // it is known and it changed --> put it on the queue with any priority
                         // TODO: sort these correctly
-                        _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY));
-                        _entitiesInQueue.insert(entity.get());
+                        priority = PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY;
+                    }
+
+
+                    if (priority != PrioritizedEntity::DO_NOT_SEND) {
+                        _sendQueue.emplace(entity, priority);
                     }
                 });
             });
@@ -479,11 +441,10 @@ bool EntityTreeSendThread::traverseTreeAndBuildNextPacketPayload(EncodeBitstream
             }
         }
         _sendQueue.pop();
-        _entitiesInQueue.erase(entity.get());
     }
     nodeData->stats.encodeStopped();
     if (_sendQueue.empty()) {
-        assert(_entitiesInQueue.empty());
+        assert(_sendQueue.empty());
         params.stopReason = EncodeBitstreamParams::FINISHED;
         _extraEncodeData->entities.clear();
     }
@@ -501,18 +462,16 @@ bool EntityTreeSendThread::traverseTreeAndBuildNextPacketPayload(EncodeBitstream
 
 void EntityTreeSendThread::editingEntityPointer(const EntityItemPointer& entity) {
     if (entity) {
-        if (_entitiesInQueue.find(entity.get()) == _entitiesInQueue.end() && _knownState.find(entity.get()) != _knownState.end()) {
+        if (!_sendQueue.contains(entity.get()) && _knownState.find(entity.get()) != _knownState.end()) {
             bool success = false;
             AACube cube = entity->getQueryAACube(success);
             if (success) {
                 // We can force a removal from _knownState if the current view is used and entity is out of view
-                if (_traversal.doesCurrentUseViewFrustum() && !_traversal.getCurrentView().cubeIntersectsKeyhole(cube)) {
-                    _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::FORCE_REMOVE, true));
-                    _entitiesInQueue.insert(entity.get());
+                if (_traversal.doesCurrentUseViewFrustum() && !_traversal.getCurrentView().intersects(cube)) {
+                    _sendQueue.emplace(entity, PrioritizedEntity::FORCE_REMOVE, true);
                 }
             } else {
-                _sendQueue.push(PrioritizedEntity(entity, PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY, true));
-                _entitiesInQueue.insert(entity.get());
+                _sendQueue.emplace(entity, PrioritizedEntity::WHEN_IN_DOUBT_PRIORITY, true);
             }
         }
     }
diff --git a/assignment-client/src/entities/EntityTreeSendThread.h b/assignment-client/src/entities/EntityTreeSendThread.h
index 1e2bd15429..9eea98b7fd 100644
--- a/assignment-client/src/entities/EntityTreeSendThread.h
+++ b/assignment-client/src/entities/EntityTreeSendThread.h
@@ -41,8 +41,7 @@ private:
     bool addAncestorsToExtraFlaggedEntities(const QUuid& filteredEntityID, EntityItem& entityItem, EntityNodeData& nodeData);
     bool addDescendantsToExtraFlaggedEntities(const QUuid& filteredEntityID, EntityItem& entityItem, EntityNodeData& nodeData);
 
-    void startNewTraversal(const ViewFrustum& viewFrustum, EntityTreeElementPointer root, int32_t lodLevelOffset, 
-        bool usesViewFrustum);
+    void startNewTraversal(const DiffTraversal::View& viewFrustum, EntityTreeElementPointer root);
     bool traverseTreeAndBuildNextPacketPayload(EncodeBitstreamParams& params, const QJsonObject& jsonFilters) override;
 
     void preDistributionProcessing() override;
@@ -51,7 +50,6 @@ private:
 
     DiffTraversal _traversal;
     EntityPriorityQueue _sendQueue;
-    std::unordered_set<EntityItem*> _entitiesInQueue;
     std::unordered_map<EntityItem*, uint64_t> _knownState;
     ConicalView _conicalView; // cached optimized view for fast priority calculations
 
diff --git a/assignment-client/src/octree/OctreeHeadlessViewer.cpp b/assignment-client/src/octree/OctreeHeadlessViewer.cpp
index d3b20fb623..6d91a134c2 100644
--- a/assignment-client/src/octree/OctreeHeadlessViewer.cpp
+++ b/assignment-client/src/octree/OctreeHeadlessViewer.cpp
@@ -14,32 +14,18 @@
 #include <NodeList.h>
 #include <OctreeLogging.h>
 
-
-OctreeHeadlessViewer::OctreeHeadlessViewer() {
-    _viewFrustum.setProjection(glm::perspective(glm::radians(DEFAULT_FIELD_OF_VIEW_DEGREES), DEFAULT_ASPECT_RATIO, DEFAULT_NEAR_CLIP, DEFAULT_FAR_CLIP));
-}
-
 void OctreeHeadlessViewer::queryOctree() {
     char serverType = getMyNodeType();
     PacketType packetType = getMyQueryMessageType();
 
-    _octreeQuery.setCameraPosition(_viewFrustum.getPosition());
-    _octreeQuery.setCameraOrientation(_viewFrustum.getOrientation());
-    _octreeQuery.setCameraFov(_viewFrustum.getFieldOfView());
-    _octreeQuery.setCameraAspectRatio(_viewFrustum.getAspectRatio());
-    _octreeQuery.setCameraNearClip(_viewFrustum.getNearClip());
-    _octreeQuery.setCameraFarClip(_viewFrustum.getFarClip());
-    _octreeQuery.setCameraEyeOffsetPosition(glm::vec3());
-    _octreeQuery.setCameraCenterRadius(_viewFrustum.getCenterRadius());
-    _octreeQuery.setOctreeSizeScale(_voxelSizeScale);
-    _octreeQuery.setBoundaryLevelAdjust(_boundaryLevelAdjust);
+    if (_hasViewFrustum) {
+        _octreeQuery.setMainViewFrustum(_viewFrustum);
+    }
 
     auto nodeList = DependencyManager::get<NodeList>();
 
     auto node = nodeList->soloNodeOfType(serverType);
     if (node && node->getActiveSocket()) {
-        _octreeQuery.setMaxQueryPacketsPerSecond(getMaxPacketsPerSecond());
-
         auto queryPacket = NLPacket::create(packetType);
 
         // encode the query data
diff --git a/assignment-client/src/octree/OctreeHeadlessViewer.h b/assignment-client/src/octree/OctreeHeadlessViewer.h
index feb8211c39..dea91ce66f 100644
--- a/assignment-client/src/octree/OctreeHeadlessViewer.h
+++ b/assignment-client/src/octree/OctreeHeadlessViewer.h
@@ -20,9 +20,6 @@
 class OctreeHeadlessViewer : public OctreeProcessor {
     Q_OBJECT
 public:
-    OctreeHeadlessViewer();
-    virtual ~OctreeHeadlessViewer() {};
-    
     OctreeQuery& getOctreeQuery() { return _octreeQuery; }
 
     static int parseOctreeStats(QSharedPointer<ReceivedMessage> message, SharedNodePointer sourceNode);
@@ -32,34 +29,32 @@ public slots:
     void queryOctree();
 
     // setters for camera attributes
-    void setPosition(const glm::vec3& position) { _viewFrustum.setPosition(position); }
-    void setOrientation(const glm::quat& orientation) { _viewFrustum.setOrientation(orientation); }
-    void setCenterRadius(float radius) { _viewFrustum.setCenterRadius(radius); }
-    void setKeyholeRadius(float radius) { _viewFrustum.setCenterRadius(radius); } // TODO: remove this legacy support
+    void setPosition(const glm::vec3& position) { _hasViewFrustum = true; _viewFrustum.setPosition(position); }
+    void setOrientation(const glm::quat& orientation) { _hasViewFrustum = true; _viewFrustum.setOrientation(orientation); }
+    void setCenterRadius(float radius) { _hasViewFrustum = true; _viewFrustum.setCenterRadius(radius); }
+    void setKeyholeRadius(float radius) { _hasViewFrustum = true; _viewFrustum.setCenterRadius(radius); } // TODO: remove this legacy support
 
     // setters for LOD and PPS
-    void setVoxelSizeScale(float sizeScale) { _voxelSizeScale = sizeScale; }
-    void setBoundaryLevelAdjust(int boundaryLevelAdjust) { _boundaryLevelAdjust = boundaryLevelAdjust; }
-    void setMaxPacketsPerSecond(int maxPacketsPerSecond) { _maxPacketsPerSecond = maxPacketsPerSecond; }
+    void setVoxelSizeScale(float sizeScale) { _octreeQuery.setOctreeSizeScale(sizeScale) ; }
+    void setBoundaryLevelAdjust(int boundaryLevelAdjust) { _octreeQuery.setBoundaryLevelAdjust(boundaryLevelAdjust); }
+    void setMaxPacketsPerSecond(int maxPacketsPerSecond) { _octreeQuery.setMaxQueryPacketsPerSecond(maxPacketsPerSecond); }
 
     // getters for camera attributes
     const glm::vec3& getPosition() const { return _viewFrustum.getPosition(); }
     const glm::quat& getOrientation() const { return _viewFrustum.getOrientation(); }
 
     // getters for LOD and PPS
-    float getVoxelSizeScale() const { return _voxelSizeScale; }
-    int getBoundaryLevelAdjust() const { return _boundaryLevelAdjust; }
-    int getMaxPacketsPerSecond() const { return _maxPacketsPerSecond; }
+    float getVoxelSizeScale() const { return _octreeQuery.getOctreeSizeScale(); }
+    int getBoundaryLevelAdjust() const { return _octreeQuery.getBoundaryLevelAdjust(); }
+    int getMaxPacketsPerSecond() const { return _octreeQuery.getMaxQueryPacketsPerSecond(); }
 
     unsigned getOctreeElementsCount() const { return _tree->getOctreeElementsCount(); }
 
 private:
     OctreeQuery _octreeQuery;
 
+    bool _hasViewFrustum { false };
     ViewFrustum _viewFrustum;
-    float _voxelSizeScale { DEFAULT_OCTREE_SIZE_SCALE };
-    int _boundaryLevelAdjust { 0 };
-    int _maxPacketsPerSecond { DEFAULT_MAX_OCTREE_PPS };
 };
 
 #endif // hifi_OctreeHeadlessViewer_h
diff --git a/assignment-client/src/octree/OctreeSendThread.cpp b/assignment-client/src/octree/OctreeSendThread.cpp
index de49bd461c..40c052659d 100644
--- a/assignment-client/src/octree/OctreeSendThread.cpp
+++ b/assignment-client/src/octree/OctreeSendThread.cpp
@@ -330,8 +330,9 @@ int OctreeSendThread::packetDistributor(SharedNodePointer node, OctreeQueryNode*
     } else {
         // we aren't forcing a full scene, check if something else suggests we should
         isFullScene = nodeData->haveJSONParametersChanged() ||
-            (nodeData->getUsesFrustum()
-             && ((!viewFrustumChanged && nodeData->getViewFrustumJustStoppedChanging()) || nodeData->hasLodChanged()));
+                      (nodeData->hasMainViewFrustum() &&
+                       (nodeData->getViewFrustumJustStoppedChanging() ||
+                        nodeData->hasLodChanged()));
     }
 
     if (nodeData->isPacketWaiting()) {
@@ -445,7 +446,6 @@ void OctreeSendThread::traverseTreeAndSendContents(SharedNodePointer node, Octre
     params.trackSend = [this](const QUuid& dataID, quint64 dataEdited) {
         _myServer->trackSend(dataID, dataEdited, _nodeUuid);
     };
-    nodeData->copyCurrentViewFrustum(params.viewFrustum);
 
     bool somethingToSend = true; // assume we have something
     bool hadSomething = hasSomethingToSend(nodeData);
diff --git a/assignment-client/src/scripts/EntityScriptServer.cpp b/assignment-client/src/scripts/EntityScriptServer.cpp
index d242b393bf..eea8e8b470 100644
--- a/assignment-client/src/scripts/EntityScriptServer.cpp
+++ b/assignment-client/src/scripts/EntityScriptServer.cpp
@@ -294,7 +294,6 @@ void EntityScriptServer::run() {
     queryJSONParameters[EntityJSONQueryProperties::FLAGS_PROPERTY] = queryFlags;
     
     // setup the JSON parameters so that OctreeQuery does not use a frustum and uses our JSON filter
-    _entityViewer.getOctreeQuery().setUsesFrustum(false);
     _entityViewer.getOctreeQuery().setJSONParameters(queryJSONParameters);
 
     entityScriptingInterface->setEntityTree(_entityViewer.getTree());
diff --git a/domain-server/resources/web/wizard/index.shtml b/domain-server/resources/web/wizard/index.shtml
index 5a3286296d..3bc7503b44 100644
--- a/domain-server/resources/web/wizard/index.shtml
+++ b/domain-server/resources/web/wizard/index.shtml
@@ -26,7 +26,7 @@
       <span class='step-description'>
         <a target='_blank' href='https://docs.highfidelity.com/create-and-explore/start-working-in-your-sandbox/place-names'>Place names</a> are similar to web addresses. Users who want to visit your domain can
         enter its Place Name in High Fidelity's Interface. You can choose a Place Name for your domain.</br>
-        People can also use your <b>domain's IP address (shown below)</b> to visit your High Fidelity domain.
+        Your domain may also be reachable by <b>IP address</b>.
       </span>
     </div>
   </div>
@@ -35,10 +35,10 @@
     <div class="centered-hack-parent">
       <div id="place-name-group" class="centered-hack">
         <p id="place-name-link"></p>
-          <div id="place-name-edit">
-            <span class='glyphicon glyphicon-pencil'></span>
-            <a href="#" id="change-place-name">Choose a custom Place Name instead</a>
-          </div>
+        <div id="place-name-edit">
+          <span class='glyphicon glyphicon-pencil'></span>
+          <a href="#" id="change-place-name">Choose a custom Place Name instead</a>
+        </div>
       </div>
     </div>
   </div>
diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index 75e6472078..5e10d29505 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -5218,6 +5218,78 @@ void Application::updateDialogs(float deltaTime) const {
     }
 }
 
+void Application::updateSecondaryCameraViewFrustum() {
+    // TODO: Fix this by modeling the way the secondary camera works on how the main camera works
+    // ie. Use a camera object stored in the game logic and informs the Engine on where the secondary
+    // camera should be.
+
+    // Code based on SecondaryCameraJob
+    auto renderConfig = _renderEngine->getConfiguration();
+    assert(renderConfig);
+    auto camera = dynamic_cast<SecondaryCameraJobConfig*>(renderConfig->getConfig("SecondaryCamera"));
+    assert(camera);
+
+    if (!camera->isEnabled()) {
+        _hasSecondaryViewFrustum = false;
+        return;
+    }
+
+    if (camera->mirrorProjection && !camera->attachedEntityId.isNull()) {
+        auto entityScriptingInterface = DependencyManager::get<EntityScriptingInterface>();
+        auto entityProperties = entityScriptingInterface->getEntityProperties(camera->attachedEntityId);
+        glm::vec3 mirrorPropertiesPosition = entityProperties.getPosition();
+        glm::quat mirrorPropertiesRotation = entityProperties.getRotation();
+        glm::vec3 mirrorPropertiesDimensions = entityProperties.getDimensions();
+        glm::vec3 halfMirrorPropertiesDimensions = 0.5f * mirrorPropertiesDimensions;
+
+        // setup mirror from world as inverse of world from mirror transformation using inverted x and z for mirrored image
+        // TODO: we are assuming here that UP is world y-axis
+        glm::mat4 worldFromMirrorRotation = glm::mat4_cast(mirrorPropertiesRotation) * glm::scale(vec3(-1.0f, 1.0f, -1.0f));
+        glm::mat4 worldFromMirrorTranslation = glm::translate(mirrorPropertiesPosition);
+        glm::mat4 worldFromMirror = worldFromMirrorTranslation * worldFromMirrorRotation;
+        glm::mat4 mirrorFromWorld = glm::inverse(worldFromMirror);
+
+        // get mirror camera position by reflecting main camera position's z coordinate in mirror space
+        glm::vec3 mainCameraPositionWorld = getCamera().getPosition();
+        glm::vec3 mainCameraPositionMirror = vec3(mirrorFromWorld * vec4(mainCameraPositionWorld, 1.0f));
+        glm::vec3 mirrorCameraPositionMirror = vec3(mainCameraPositionMirror.x, mainCameraPositionMirror.y,
+                                                    -mainCameraPositionMirror.z);
+        glm::vec3 mirrorCameraPositionWorld = vec3(worldFromMirror * vec4(mirrorCameraPositionMirror, 1.0f));
+
+        // set frustum position to be mirrored camera and set orientation to mirror's adjusted rotation
+        glm::quat mirrorCameraOrientation = glm::quat_cast(worldFromMirrorRotation);
+        _secondaryViewFrustum.setPosition(mirrorCameraPositionWorld);
+        _secondaryViewFrustum.setOrientation(mirrorCameraOrientation);
+
+        // build frustum using mirror space translation of mirrored camera
+        float nearClip = mirrorCameraPositionMirror.z + mirrorPropertiesDimensions.z * 2.0f;
+        glm::vec3 upperRight = halfMirrorPropertiesDimensions - mirrorCameraPositionMirror;
+        glm::vec3 bottomLeft = -halfMirrorPropertiesDimensions - mirrorCameraPositionMirror;
+        glm::mat4 frustum = glm::frustum(bottomLeft.x, upperRight.x, bottomLeft.y, upperRight.y, nearClip, camera->farClipPlaneDistance);
+        _secondaryViewFrustum.setProjection(frustum);
+    } else {
+        if (!camera->attachedEntityId.isNull()) {
+            auto entityScriptingInterface = DependencyManager::get<EntityScriptingInterface>();
+            auto entityProperties = entityScriptingInterface->getEntityProperties(camera->attachedEntityId);
+            _secondaryViewFrustum.setPosition(entityProperties.getPosition());
+            _secondaryViewFrustum.setOrientation(entityProperties.getRotation());
+        } else {
+            _secondaryViewFrustum.setPosition(camera->position);
+            _secondaryViewFrustum.setOrientation(camera->orientation);
+        }
+
+        float aspectRatio = (float)camera->textureWidth / (float)camera->textureHeight;
+        _secondaryViewFrustum.setProjection(camera->vFoV,
+                                            aspectRatio,
+                                            camera->nearClipPlaneDistance,
+                                            camera->farClipPlaneDistance);
+    }
+    // Without calculating the bound planes, the secondary camera will use the same culling frustum as the main camera,
+    // which is not what we want here.
+    _secondaryViewFrustum.calculate();
+    _hasSecondaryViewFrustum = true;
+}
+
 static bool domainLoadingInProgress = false;
 
 void Application::update(float deltaTime) {
@@ -5571,6 +5643,11 @@ void Application::update(float deltaTime) {
     {
         QMutexLocker viewLocker(&_viewMutex);
         _myCamera.loadViewFrustum(_viewFrustum);
+
+        // TODO: Fix this by modeling the way the secondary camera works on how the main camera works
+        // ie. Use a camera object stored in the game logic and informs the Engine on where the secondary
+        // camera should be.
+        updateSecondaryCameraViewFrustum();
     }
 
     quint64 now = usecTimestampNow();
@@ -5584,6 +5661,8 @@ void Application::update(float deltaTime) {
         const quint64 TOO_LONG_SINCE_LAST_QUERY = 3 * USECS_PER_SECOND;
         bool queryIsDue = sinceLastQuery > TOO_LONG_SINCE_LAST_QUERY;
         bool viewIsDifferentEnough = !_lastQueriedViewFrustum.isVerySimilar(_viewFrustum);
+        viewIsDifferentEnough |= _hasSecondaryViewFrustum && !_lastQueriedSecondaryViewFrustum.isVerySimilar(_secondaryViewFrustum);
+        
         // if it's been a while since our last query or the view has significantly changed then send a query, otherwise suppress it
         if (queryIsDue || viewIsDifferentEnough) {
             _lastQueriedTime = now;
@@ -5592,6 +5671,7 @@ void Application::update(float deltaTime) {
             }
             sendAvatarViewFrustum();
             _lastQueriedViewFrustum = _viewFrustum;
+            _lastQueriedSecondaryViewFrustum = _secondaryViewFrustum;
         }
     }
 
@@ -5764,8 +5844,16 @@ void Application::update(float deltaTime) {
 }
 
 void Application::sendAvatarViewFrustum() {
+    uint8_t numFrustums = 1;
     QByteArray viewFrustumByteArray = _viewFrustum.toByteArray();
-    auto avatarPacket = NLPacket::create(PacketType::ViewFrustum, viewFrustumByteArray.size());
+
+    if (_hasSecondaryViewFrustum) {
+        ++numFrustums;
+        viewFrustumByteArray += _secondaryViewFrustum.toByteArray();
+    }
+
+    auto avatarPacket = NLPacket::create(PacketType::ViewFrustum, viewFrustumByteArray.size() + sizeof(numFrustums));
+    avatarPacket->writePrimitive(numFrustums);
     avatarPacket->write(viewFrustumByteArray);
 
     DependencyManager::get<NodeList>()->broadcastToNodes(std::move(avatarPacket), NodeSet() << NodeType::AvatarMixer);
@@ -5830,14 +5918,15 @@ void Application::queryOctree(NodeType_t serverType, PacketType packetType) {
 
     ViewFrustum viewFrustum;
     copyViewFrustum(viewFrustum);
-    _octreeQuery.setCameraPosition(viewFrustum.getPosition());
-    _octreeQuery.setCameraOrientation(viewFrustum.getOrientation());
-    _octreeQuery.setCameraFov(viewFrustum.getFieldOfView());
-    _octreeQuery.setCameraAspectRatio(viewFrustum.getAspectRatio());
-    _octreeQuery.setCameraNearClip(viewFrustum.getNearClip());
-    _octreeQuery.setCameraFarClip(viewFrustum.getFarClip());
-    _octreeQuery.setCameraEyeOffsetPosition(glm::vec3());
-    _octreeQuery.setCameraCenterRadius(viewFrustum.getCenterRadius());
+    _octreeQuery.setMainViewFrustum(viewFrustum);
+
+    if (hasSecondaryViewFrustum()) {
+        copySecondaryViewFrustum(viewFrustum);
+        _octreeQuery.setSecondaryViewFrustum(viewFrustum);
+    } else {
+        _octreeQuery.clearSecondaryViewFrustum();
+    }
+
     auto lodManager = DependencyManager::get<LODManager>();
     _octreeQuery.setOctreeSizeScale(lodManager->getOctreeSizeScale());
     _octreeQuery.setBoundaryLevelAdjust(lodManager->getBoundaryLevelAdjust());
@@ -5921,6 +6010,11 @@ void Application::copyDisplayViewFrustum(ViewFrustum& viewOut) const {
     viewOut = _displayViewFrustum;
 }
 
+void Application::copySecondaryViewFrustum(ViewFrustum& viewOut) const {
+    QMutexLocker viewLocker(&_viewMutex);
+    viewOut = _secondaryViewFrustum;
+}
+
 void Application::resetSensors(bool andReload) {
     DependencyManager::get<DdeFaceTracker>()->reset();
     DependencyManager::get<EyeTracker>()->reset();
diff --git a/interface/src/Application.h b/interface/src/Application.h
index e1787b7a32..83e719333d 100644
--- a/interface/src/Application.h
+++ b/interface/src/Application.h
@@ -149,6 +149,8 @@ public:
     void initializeRenderEngine();
     void initializeUi();
 
+    void updateSecondaryCameraViewFrustum();
+
     void updateCamera(RenderArgs& renderArgs, float deltaTime);
     void paintGL();
     void resizeGL();
@@ -173,11 +175,14 @@ public:
     Camera& getCamera() { return _myCamera; }
     const Camera& getCamera() const { return _myCamera; }
     // Represents the current view frustum of the avatar.
-    void copyViewFrustum(ViewFrustum& viewOut) const;
+    void copyViewFrustum(ViewFrustum& viewOut) const override;
+    void copySecondaryViewFrustum(ViewFrustum& viewOut) const override;
+    bool hasSecondaryViewFrustum() const override { return _hasSecondaryViewFrustum; }
     // Represents the view frustum of the current rendering pass,
     // which might be different from the viewFrustum, i.e. shadowmap
     // passes, mirror window passes, etc
     void copyDisplayViewFrustum(ViewFrustum& viewOut) const;
+
     const OctreePacketProcessor& getOctreePacketProcessor() const { return _octreeProcessor; }
     QSharedPointer<EntityTreeRenderer> getEntities() const { return DependencyManager::get<EntityTreeRenderer>(); }
     QUndoStack* getUndoStack() { return &_undoStack; }
@@ -569,8 +574,11 @@ private:
 
     mutable QMutex _viewMutex { QMutex::Recursive };
     ViewFrustum _viewFrustum; // current state of view frustum, perspective, orientation, etc.
-    ViewFrustum _lastQueriedViewFrustum; /// last view frustum used to query octree servers (voxels)
+    ViewFrustum _lastQueriedViewFrustum; // last view frustum used to query octree servers
     ViewFrustum _displayViewFrustum;
+    ViewFrustum _secondaryViewFrustum;
+    ViewFrustum _lastQueriedSecondaryViewFrustum; // last secondary view frustum used to query octree servers
+    bool _hasSecondaryViewFrustum;
     quint64 _lastQueriedTime;
 
     OctreeQuery _octreeQuery { true }; // NodeData derived class for querying octee cells from octree servers
diff --git a/interface/src/Crashpad.cpp b/interface/src/Crashpad.cpp
index e39cd42d81..45f1d0778f 100644
--- a/interface/src/Crashpad.cpp
+++ b/interface/src/Crashpad.cpp
@@ -11,6 +11,8 @@
 
 #include "Crashpad.h"
 
+#include <assert.h>
+
 #include <QDebug>
 
 #if HAS_CRASHPAD
@@ -20,7 +22,7 @@
 #include <QStandardPaths>
 #include <QDir>
 
-#include <BuildInfo.h>
+#include <Windows.h>
 
 #include <client/crashpad_client.h>
 #include <client/crash_report_database.h>
@@ -28,28 +30,27 @@
 #include <client/annotation_list.h>
 #include <client/crashpad_info.h>
 
+#include <BuildInfo.h>
+
 using namespace crashpad;
 
 static const std::string BACKTRACE_URL { CMAKE_BACKTRACE_URL };
 static const std::string BACKTRACE_TOKEN { CMAKE_BACKTRACE_TOKEN };
 
-static std::wstring gIPCPipe;
-
 extern QString qAppFileName();
 
+CrashpadClient* client { nullptr };
 std::mutex annotationMutex;
 crashpad::SimpleStringDictionary* crashpadAnnotations { nullptr };
 
-#include <Windows.h>
-
 LONG WINAPI vectoredExceptionHandler(PEXCEPTION_POINTERS pExceptionInfo) {
+    if (!client) {
+        return EXCEPTION_CONTINUE_SEARCH;
+    }
+
     if (pExceptionInfo->ExceptionRecord->ExceptionCode == STATUS_HEAP_CORRUPTION ||
         pExceptionInfo->ExceptionRecord->ExceptionCode == STATUS_STACK_BUFFER_OVERRUN) {
-        CrashpadClient client;
-        if (gIPCPipe.length()) {
-            client.SetHandlerIPCPipe(gIPCPipe);
-        }
-        client.DumpAndCrash(pExceptionInfo);
+        client->DumpAndCrash(pExceptionInfo);
     }
 
     return EXCEPTION_CONTINUE_SEARCH;
@@ -60,7 +61,8 @@ bool startCrashHandler() {
         return false;
     }
 
-    CrashpadClient client;
+    assert(!client);
+    client = new CrashpadClient();
     std::vector<std::string> arguments;
 
     std::map<std::string, std::string> annotations;
@@ -96,12 +98,9 @@ bool startCrashHandler() {
     // Enable automated uploads.
     database->GetSettings()->SetUploadsEnabled(true);
 
-    bool result = client.StartHandler(handler, db, db, BACKTRACE_URL, annotations, arguments, true, true);
-    gIPCPipe = client.GetHandlerIPCPipe();
-
     AddVectoredExceptionHandler(0, vectoredExceptionHandler);
 
-    return result;
+    return client->StartHandler(handler, db, db, BACKTRACE_URL, annotations, arguments, true, true);
 }
 
 void setCrashAnnotation(std::string name, std::string value) {
diff --git a/interface/src/avatar/AvatarManager.cpp b/interface/src/avatar/AvatarManager.cpp
index b71c060465..087e23a933 100644
--- a/interface/src/avatar/AvatarManager.cpp
+++ b/interface/src/avatar/AvatarManager.cpp
@@ -155,9 +155,19 @@ void AvatarManager::updateOtherAvatars(float deltaTime) {
         AvatarSharedPointer _avatar;
     };
 
-    ViewFrustum cameraView;
-    qApp->copyDisplayViewFrustum(cameraView);
-    PrioritySortUtil::PriorityQueue<SortableAvatar> sortedAvatars(cameraView,
+
+    ViewFrustums views;
+
+    ViewFrustum view;
+    qApp->copyCurrentViewFrustum(view);
+    views.push_back(view);
+
+    if (qApp->hasSecondaryViewFrustum()) {
+        qApp->copySecondaryViewFrustum(view);
+        views.push_back(view);
+    }
+
+    PrioritySortUtil::PriorityQueue<SortableAvatar> sortedAvatars(views,
             AvatarData::_avatarSortCoefficientSize,
             AvatarData::_avatarSortCoefficientCenter,
             AvatarData::_avatarSortCoefficientAge);
diff --git a/libraries/avatars/src/AvatarData.h b/libraries/avatars/src/AvatarData.h
index 888c3bfb24..bbcdd3693d 100644
--- a/libraries/avatars/src/AvatarData.h
+++ b/libraries/avatars/src/AvatarData.h
@@ -277,8 +277,6 @@ namespace AvatarDataPacket {
 
 const float MAX_AUDIO_LOUDNESS = 1000.0f; // close enough for mouth animation
 
-const int AVATAR_IDENTITY_PACKET_SEND_INTERVAL_MSECS = 1000;
-
 // See also static AvatarData::defaultFullAvatarModelUrl().
 const QString DEFAULT_FULL_AVATAR_MODEL_NAME = QString("Default");
 
diff --git a/libraries/entities-renderer/src/EntityTreeRenderer.cpp b/libraries/entities-renderer/src/EntityTreeRenderer.cpp
index ba81922979..6dd13c7332 100644
--- a/libraries/entities-renderer/src/EntityTreeRenderer.cpp
+++ b/libraries/entities-renderer/src/EntityTreeRenderer.cpp
@@ -296,7 +296,8 @@ void EntityTreeRenderer::addPendingEntities(const render::ScenePointer& scene, r
     }
 }
 
-void EntityTreeRenderer::updateChangedEntities(const render::ScenePointer& scene, const ViewFrustum& view, render::Transaction& transaction) {
+void EntityTreeRenderer::updateChangedEntities(const render::ScenePointer& scene, const ViewFrustums& views,
+                                               render::Transaction& transaction) {
     PROFILE_RANGE_EX(simulation_physics, "ChangeInScene", 0xffff00ff, (uint64_t)_changedEntities.size());
     PerformanceTimer pt("change");
     std::unordered_set<EntityItemID> changedEntities;
@@ -357,7 +358,7 @@ void EntityTreeRenderer::updateChangedEntities(const render::ScenePointer& scene
 
         // prioritize and sort the renderables
         uint64_t sortStart = usecTimestampNow();
-        PrioritySortUtil::PriorityQueue<SortableRenderer> sortedRenderables(view);
+        PrioritySortUtil::PriorityQueue<SortableRenderer> sortedRenderables(views);
         {
             PROFILE_RANGE_EX(simulation_physics, "SortRenderables", 0xffff00ff, (uint64_t)_renderablesToUpdate.size());
             std::unordered_map<EntityItemID, EntityRendererPointer>::iterator itr = _renderablesToUpdate.begin();
@@ -415,9 +416,20 @@ void EntityTreeRenderer::update(bool simulate) {
             if (scene) {
                 render::Transaction transaction;
                 addPendingEntities(scene, transaction);
+
+                ViewFrustums views;
+
                 ViewFrustum view;
-                _viewState->copyCurrentViewFrustum(view);
-                updateChangedEntities(scene, view, transaction);
+                _viewState->copyViewFrustum(view);
+                views.push_back(view);
+
+                if (_viewState->hasSecondaryViewFrustum()) {
+                    _viewState->copySecondaryViewFrustum(view);
+                    views.push_back(view);
+                }
+
+
+                updateChangedEntities(scene, views, transaction);
                 scene->enqueueTransaction(transaction);
             }
         }
diff --git a/libraries/entities-renderer/src/EntityTreeRenderer.h b/libraries/entities-renderer/src/EntityTreeRenderer.h
index f5cedfdd01..9ed4f9d21d 100644
--- a/libraries/entities-renderer/src/EntityTreeRenderer.h
+++ b/libraries/entities-renderer/src/EntityTreeRenderer.h
@@ -148,7 +148,8 @@ protected:
 
 private:
     void addPendingEntities(const render::ScenePointer& scene, render::Transaction& transaction);
-    void updateChangedEntities(const render::ScenePointer& scene, const ViewFrustum& view, render::Transaction& transaction);
+    void updateChangedEntities(const render::ScenePointer& scene, const ViewFrustums& views,
+                               render::Transaction& transaction);
     EntityRendererPointer renderableForEntity(const EntityItemPointer& entity) const { return renderableForEntityId(entity->getID()); }
     render::ItemID renderableIdForEntity(const EntityItemPointer& entity) const { return renderableIdForEntityId(entity->getID()); }
 
diff --git a/libraries/entities/src/DiffTraversal.cpp b/libraries/entities/src/DiffTraversal.cpp
index 764c420197..39328e11ad 100644
--- a/libraries/entities/src/DiffTraversal.cpp
+++ b/libraries/entities/src/DiffTraversal.cpp
@@ -13,7 +13,6 @@
 
 #include <OctreeUtils.h>
 
-
 DiffTraversal::Waypoint::Waypoint(EntityTreeElementPointer& element) : _nextIndex(0) {
     assert(element);
     _weakElement = element;
@@ -37,15 +36,14 @@ void DiffTraversal::Waypoint::getNextVisibleElementFirstTime(DiffTraversal::Visi
                 EntityTreeElementPointer nextElement = element->getChildAtIndex(_nextIndex);
                 ++_nextIndex;
                 if (nextElement) {
-                    if (!view.usesViewFrustum) {
+                    const auto& cube = nextElement->getAACube();
+                    if (!view.usesViewFrustums()) {
                         // No LOD truncation if we aren't using the view frustum
                         next.element = nextElement;
                         return;
-                    } else if (view.viewFrustum.cubeIntersectsKeyhole(nextElement->getAACube())) {
+                    } else if (view.intersects(cube)) {
                         // check for LOD truncation
-                        float distance = glm::distance(view.viewFrustum.getPosition(), nextElement->getAACube().calcCenter()) + MIN_VISIBLE_DISTANCE;
-                        float angularDiameter = nextElement->getAACube().getScale() / distance;
-                        if (angularDiameter > MIN_ELEMENT_ANGULAR_DIAMETER * view.lodScaleFactor) {
+                        if (view.isBigEnough(cube, MIN_ELEMENT_ANGULAR_DIAMETER)) {
                             next.element = nextElement;
                             return;
                         }
@@ -76,17 +74,16 @@ void DiffTraversal::Waypoint::getNextVisibleElementRepeat(
                 EntityTreeElementPointer nextElement = element->getChildAtIndex(_nextIndex);
                 ++_nextIndex;
                 if (nextElement && nextElement->getLastChanged() > lastTime) {
-                    if (!view.usesViewFrustum) {
+                    if (!view.usesViewFrustums()) {
                         // No LOD truncation if we aren't using the view frustum
                         next.element = nextElement;
                         next.intersection = ViewFrustum::INSIDE;
                         return;
                     } else {
                         // check for LOD truncation
-                        float distance = glm::distance(view.viewFrustum.getPosition(), nextElement->getAACube().calcCenter()) + MIN_VISIBLE_DISTANCE;
-                        float angularDiameter = nextElement->getAACube().getScale() / distance;
-                        if (angularDiameter > MIN_ELEMENT_ANGULAR_DIAMETER * view.lodScaleFactor) {
-                            ViewFrustum::intersection intersection = view.viewFrustum.calculateCubeKeyholeIntersection(nextElement->getAACube());
+                        const auto& cube = nextElement->getAACube();
+                        if (view.isBigEnough(cube, MIN_ELEMENT_ANGULAR_DIAMETER)) {
+                            ViewFrustum::intersection intersection = view.calculateIntersection(cube);
                             if (intersection != ViewFrustum::OUTSIDE) {
                                 next.element = nextElement;
                                 next.intersection = intersection;
@@ -118,14 +115,13 @@ void DiffTraversal::Waypoint::getNextVisibleElementDifferential(DiffTraversal::V
                 EntityTreeElementPointer nextElement = element->getChildAtIndex(_nextIndex);
                 ++_nextIndex;
                 if (nextElement) {
-                    AACube cube = nextElement->getAACube();
                     // check for LOD truncation
-                    float distance = glm::distance(view.viewFrustum.getPosition(), cube.calcCenter()) + MIN_VISIBLE_DISTANCE;
-                    float angularDiameter = cube.getScale() / distance;
-                    if (angularDiameter > MIN_ELEMENT_ANGULAR_DIAMETER * view.lodScaleFactor) {
-                        if (view.viewFrustum.calculateCubeKeyholeIntersection(cube) != ViewFrustum::OUTSIDE) {
+                    const auto& cube = nextElement->getAACube();
+                    if (view.isBigEnough(cube, MIN_ELEMENT_ANGULAR_DIAMETER)) {
+                        ViewFrustum::intersection intersection = view.calculateIntersection(cube);
+                        if (intersection != ViewFrustum::OUTSIDE) {
                             next.element = nextElement;
-                            next.intersection = ViewFrustum::OUTSIDE;
+                            next.intersection = intersection;
                             return;
                         }
                     }
@@ -137,13 +133,83 @@ void DiffTraversal::Waypoint::getNextVisibleElementDifferential(DiffTraversal::V
     next.intersection = ViewFrustum::OUTSIDE;
 }
 
+bool DiffTraversal::View::isBigEnough(const AACube& cube, float minDiameter) const {
+    if (viewFrustums.empty()) {
+        // Everything is big enough when not using view frustums
+        return true;
+    }
+
+    bool isBigEnough = std::any_of(std::begin(viewFrustums), std::end(viewFrustums),
+                                   [&](const ViewFrustum& viewFrustum) {
+        return isAngularSizeBigEnough(viewFrustum.getPosition(), cube, lodScaleFactor, minDiameter);
+    });
+
+    return isBigEnough;
+}
+
+bool DiffTraversal::View::intersects(const AACube& cube) const {
+    if (viewFrustums.empty()) {
+        // Everything intersects when not using view frustums
+        return true;
+    }
+
+    bool intersects = std::any_of(std::begin(viewFrustums), std::end(viewFrustums),
+                                  [&](const ViewFrustum& viewFrustum) {
+        return viewFrustum.cubeIntersectsKeyhole(cube);
+    });
+
+    return intersects;
+}
+
+ViewFrustum::intersection DiffTraversal::View::calculateIntersection(const AACube& cube) const {
+    if (viewFrustums.empty()) {
+        // Everything is inside when not using view frustums
+        return ViewFrustum::INSIDE;
+    }
+
+    ViewFrustum::intersection intersection = ViewFrustum::OUTSIDE;
+
+    for (const auto& viewFrustum : viewFrustums) {
+        switch (viewFrustum.calculateCubeKeyholeIntersection(cube)) {
+            case ViewFrustum::INSIDE:
+                return ViewFrustum::INSIDE;
+            case ViewFrustum::INTERSECT:
+                intersection = ViewFrustum::INTERSECT;
+                break;
+            default:
+                // DO NOTHING
+                break;
+        }
+    }
+    return intersection;
+}
+
+bool DiffTraversal::View::usesViewFrustums() const {
+    return !viewFrustums.empty();
+}
+
+bool DiffTraversal::View::isVerySimilar(const View& view) const {
+    auto size = view.viewFrustums.size();
+
+    if (view.lodScaleFactor != lodScaleFactor ||
+        viewFrustums.size() != size) {
+        return false;
+    }
+
+    for (size_t i = 0; i < size; ++i) {
+        if (!viewFrustums[i].isVerySimilar(view.viewFrustums[i])) {
+            return false;
+        }
+    }
+    return true;
+}
+
 DiffTraversal::DiffTraversal() {
     const int32_t MIN_PATH_DEPTH = 16;
     _path.reserve(MIN_PATH_DEPTH);
 }
 
-DiffTraversal::Type DiffTraversal::prepareNewTraversal(const ViewFrustum& viewFrustum, EntityTreeElementPointer root, 
-        int32_t lodLevelOffset, bool usesViewFrustum) {
+DiffTraversal::Type DiffTraversal::prepareNewTraversal(const DiffTraversal::View& view, EntityTreeElementPointer root) {
     assert(root);
     // there are three types of traversal:
     //
@@ -159,29 +225,25 @@ DiffTraversal::Type DiffTraversal::prepareNewTraversal(const ViewFrustum& viewFr
     //
     // external code should update the _scanElementCallback after calling prepareNewTraversal
     //
-    _currentView.usesViewFrustum = usesViewFrustum;
-    float lodScaleFactor = powf(2.0f, lodLevelOffset);
 
     Type type;
     // If usesViewFrustum changes, treat it as a First traversal
-    if (_completedView.startTime == 0 || _currentView.usesViewFrustum != _completedView.usesViewFrustum) {
+    if (_completedView.startTime == 0 || _currentView.usesViewFrustums() != _completedView.usesViewFrustums()) {
         type = Type::First;
-        _currentView.viewFrustum = viewFrustum;
-        _currentView.lodScaleFactor = lodScaleFactor;
+        _currentView.viewFrustums = view.viewFrustums;
+        _currentView.lodScaleFactor = view.lodScaleFactor;
         _getNextVisibleElementCallback = [this](DiffTraversal::VisibleElement& next) {
             _path.back().getNextVisibleElementFirstTime(next, _currentView);
         };
-    } else if (!_currentView.usesViewFrustum ||
-               (_completedView.viewFrustum.isVerySimilar(viewFrustum) &&
-                lodScaleFactor == _completedView.lodScaleFactor)) {
+    } else if (!_currentView.usesViewFrustums() || _completedView.isVerySimilar(view)) {
         type = Type::Repeat;
         _getNextVisibleElementCallback = [this](DiffTraversal::VisibleElement& next) {
             _path.back().getNextVisibleElementRepeat(next, _completedView, _completedView.startTime);
         };
     } else {
         type = Type::Differential;
-        _currentView.viewFrustum = viewFrustum;
-        _currentView.lodScaleFactor = lodScaleFactor;
+        _currentView.viewFrustums = view.viewFrustums;
+        _currentView.lodScaleFactor = view.lodScaleFactor;
         _getNextVisibleElementCallback = [this](DiffTraversal::VisibleElement& next) {
             _path.back().getNextVisibleElementDifferential(next, _currentView, _completedView);
         };
diff --git a/libraries/entities/src/DiffTraversal.h b/libraries/entities/src/DiffTraversal.h
index 69431d8db5..0fd014ac23 100644
--- a/libraries/entities/src/DiffTraversal.h
+++ b/libraries/entities/src/DiffTraversal.h
@@ -30,10 +30,15 @@ public:
     // View is a struct with a ViewFrustum and LOD parameters
     class View {
     public:
-        ViewFrustum viewFrustum;
+        bool isBigEnough(const AACube& cube, float minDiameter = MIN_ENTITY_ANGULAR_DIAMETER) const;
+        bool intersects(const AACube& cube) const;
+        bool usesViewFrustums() const;
+        bool isVerySimilar(const View& view) const;
+        ViewFrustum::intersection calculateIntersection(const AACube& cube) const;
+
+        ViewFrustums viewFrustums;
         uint64_t startTime { 0 };
         float lodScaleFactor { 1.0f };
-        bool usesViewFrustum { true };
     };
 
     // Waypoint is an bookmark in a "path" of waypoints during a traversal.
@@ -57,15 +62,12 @@ public:
 
     DiffTraversal();
 
-    Type prepareNewTraversal(const ViewFrustum& viewFrustum, EntityTreeElementPointer root, int32_t lodLevelOffset, 
-        bool usesViewFrustum);
+    Type prepareNewTraversal(const DiffTraversal::View& view, EntityTreeElementPointer root);
 
-    const ViewFrustum& getCurrentView() const { return _currentView.viewFrustum; }
-    const ViewFrustum& getCompletedView() const { return _completedView.viewFrustum; }
+    const View& getCurrentView() const { return _currentView; }
+    const View& getCompletedView() const { return _completedView; }
 
-    bool doesCurrentUseViewFrustum() const { return _currentView.usesViewFrustum; }
-    float getCurrentLODScaleFactor() const { return _currentView.lodScaleFactor; }
-    float getCompletedLODScaleFactor() const { return _completedView.lodScaleFactor; }
+    bool doesCurrentUseViewFrustum() const { return _currentView.usesViewFrustums(); }
 
     uint64_t getStartOfCompletedTraversal() const { return _completedView.startTime; }
     bool finished() const { return _path.empty(); }
diff --git a/libraries/entities/src/EntityTree.h b/libraries/entities/src/EntityTree.h
index 3289101967..d95dbf2990 100644
--- a/libraries/entities/src/EntityTree.h
+++ b/libraries/entities/src/EntityTree.h
@@ -27,9 +27,6 @@ using EntityTreePointer = std::shared_ptr<EntityTree>;
 #include "MovingEntitiesOperator.h"
 
 class EntityEditFilters;
-class Model;
-using ModelPointer = std::shared_ptr<Model>;
-using ModelWeakPointer = std::weak_ptr<Model>;
 
 class EntitySimulation;
 
diff --git a/libraries/networking/src/udt/PacketHeaders.cpp b/libraries/networking/src/udt/PacketHeaders.cpp
index 98b0e1d892..17b0d90cfe 100644
--- a/libraries/networking/src/udt/PacketHeaders.cpp
+++ b/libraries/networking/src/udt/PacketHeaders.cpp
@@ -34,7 +34,7 @@ PacketVersion versionForPacketType(PacketType packetType) {
         case PacketType::EntityPhysics:
             return static_cast<PacketVersion>(EntityVersion::MaterialData);
         case PacketType::EntityQuery:
-            return static_cast<PacketVersion>(EntityQueryPacketVersion::RemovedJurisdictions);
+            return static_cast<PacketVersion>(EntityQueryPacketVersion::MultiFrustumQuery);
         case PacketType::AvatarIdentity:
         case PacketType::AvatarData:
         case PacketType::BulkAvatarData:
@@ -90,6 +90,8 @@ PacketVersion versionForPacketType(PacketType packetType) {
             return 18;  // replace min_avatar_scale and max_avatar_scale with min_avatar_height and max_avatar_height
         case PacketType::Ping:
             return static_cast<PacketVersion>(PingVersion::IncludeConnectionID);
+        case PacketType::ViewFrustum:
+            return static_cast<PacketVersion>(ViewFrustumVersion::SendMultipleFrustums);
         default:
             return 20;
     }
diff --git a/libraries/networking/src/udt/PacketHeaders.h b/libraries/networking/src/udt/PacketHeaders.h
index e6b133c158..c72bbb0129 100644
--- a/libraries/networking/src/udt/PacketHeaders.h
+++ b/libraries/networking/src/udt/PacketHeaders.h
@@ -244,7 +244,8 @@ enum class EntityQueryPacketVersion: PacketVersion {
     JSONFilter = 18,
     JSONFilterWithFamilyTree = 19,
     ConnectionIdentifier = 20,
-    RemovedJurisdictions = 21
+    RemovedJurisdictions = 21,
+    MultiFrustumQuery = 22
 };
 
 enum class AssetServerPacketVersion: PacketVersion {
@@ -327,4 +328,8 @@ enum class PingVersion : PacketVersion {
     IncludeConnectionID = 18
 };
 
+enum class ViewFrustumVersion : PacketVersion {
+    SendMultipleFrustums = 21
+};
+
 #endif // hifi_PacketHeaders_h
diff --git a/libraries/octree/src/Octree.h b/libraries/octree/src/Octree.h
index a2ad834e18..b827ed7cd0 100644
--- a/libraries/octree/src/Octree.h
+++ b/libraries/octree/src/Octree.h
@@ -59,7 +59,6 @@ const int LOW_RES_MOVING_ADJUST  = 1;
 
 class EncodeBitstreamParams {
 public:
-    ViewFrustum viewFrustum;
     bool includeExistsBits;
     NodeData* nodeData;
 
diff --git a/libraries/octree/src/OctreeQuery.cpp b/libraries/octree/src/OctreeQuery.cpp
index 18766dd7f6..18e907cb8c 100644
--- a/libraries/octree/src/OctreeQuery.cpp
+++ b/libraries/octree/src/OctreeQuery.cpp
@@ -9,6 +9,8 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
+#include "OctreeQuery.h"
+
 #include <random>
 
 #include <QtCore/QJsonDocument>
@@ -16,23 +18,11 @@
 #include <GLMHelpers.h>
 #include <udt/PacketHeaders.h>
 
-#include "OctreeConstants.h"
-#include "OctreeQuery.h"
-
-const float DEFAULT_FOV = 45.0f; // degrees
-const float DEFAULT_ASPECT_RATIO = 1.0f;
-const float DEFAULT_NEAR_CLIP = 0.1f;
-const float DEFAULT_FAR_CLIP = 3.0f;
-
-OctreeQuery::OctreeQuery(bool randomizeConnectionID) :
-    _cameraFov(DEFAULT_FOV),
-    _cameraAspectRatio(DEFAULT_ASPECT_RATIO),
-    _cameraNearClip(DEFAULT_NEAR_CLIP),
-    _cameraFarClip(DEFAULT_FAR_CLIP),
-    _cameraCenterRadius(DEFAULT_FAR_CLIP)
-{
-    _maxQueryPPS = DEFAULT_MAX_OCTREE_PPS;
+using QueryFlags = uint8_t;
+const QueryFlags QUERY_HAS_MAIN_FRUSTUM = 1U << 0;
+const QueryFlags QUERY_HAS_SECONDARY_FRUSTUM = 1U << 1;
 
+OctreeQuery::OctreeQuery(bool randomizeConnectionID) {
     if (randomizeConnectionID) {
         // randomize our initial octree query connection ID using random_device
         // the connection ID is 16 bits so we take a generated 32 bit value from random device and chop off the top
@@ -47,26 +37,28 @@ int OctreeQuery::getBroadcastData(unsigned char* destinationBuffer) {
     // pack the connection ID so the server can detect when we start a new connection
     memcpy(destinationBuffer, &_connectionID, sizeof(_connectionID));
     destinationBuffer += sizeof(_connectionID);
-    
-    // back a boolean (cut to 1 byte) to designate if this query uses the sent view frustum
-    memcpy(destinationBuffer, &_usesFrustum, sizeof(_usesFrustum));
-    destinationBuffer += sizeof(_usesFrustum);
-    
-    if (_usesFrustum) {
-        // TODO: DRY this up to a shared method
-        // that can pack any type given the number of bytes
-        // and return the number of bytes to push the pointer
-        
-        // camera details
-        memcpy(destinationBuffer, &_cameraPosition, sizeof(_cameraPosition));
-        destinationBuffer += sizeof(_cameraPosition);
-        destinationBuffer += packOrientationQuatToBytes(destinationBuffer, _cameraOrientation);
-        destinationBuffer += packFloatAngleToTwoByte(destinationBuffer, _cameraFov);
-        destinationBuffer += packFloatRatioToTwoByte(destinationBuffer, _cameraAspectRatio);
-        destinationBuffer += packClipValueToTwoByte(destinationBuffer, _cameraNearClip);
-        destinationBuffer += packClipValueToTwoByte(destinationBuffer, _cameraFarClip);
-        memcpy(destinationBuffer, &_cameraEyeOffsetPosition, sizeof(_cameraEyeOffsetPosition));
-        destinationBuffer += sizeof(_cameraEyeOffsetPosition);
+
+    // flags for wether the frustums are present
+    QueryFlags frustumFlags = 0;
+    if (_hasMainFrustum) {
+        frustumFlags |= QUERY_HAS_MAIN_FRUSTUM;
+    }
+    if (_hasSecondaryFrustum) {
+        frustumFlags |= QUERY_HAS_SECONDARY_FRUSTUM;
+    }
+    memcpy(destinationBuffer, &frustumFlags, sizeof(frustumFlags));
+    destinationBuffer += sizeof(frustumFlags);
+
+    if (_hasMainFrustum) {
+        auto byteArray = _mainViewFrustum.toByteArray();
+        memcpy(destinationBuffer, byteArray.constData(), byteArray.size());
+        destinationBuffer += byteArray.size();
+    }
+
+    if (_hasSecondaryFrustum) {
+        auto byteArray = _secondaryViewFrustum.toByteArray();
+        memcpy(destinationBuffer, byteArray.constData(), byteArray.size());
+        destinationBuffer += byteArray.size();
     }
     
     // desired Max Octree PPS
@@ -80,9 +72,6 @@ int OctreeQuery::getBroadcastData(unsigned char* destinationBuffer) {
     // desired boundaryLevelAdjust
     memcpy(destinationBuffer, &_boundaryLevelAdjust, sizeof(_boundaryLevelAdjust));
     destinationBuffer += sizeof(_boundaryLevelAdjust);
-
-    memcpy(destinationBuffer, &_cameraCenterRadius, sizeof(_cameraCenterRadius));
-    destinationBuffer += sizeof(_cameraCenterRadius);
     
     // create a QByteArray that holds the binary representation of the JSON parameters
     QByteArray binaryParametersDocument;
@@ -110,6 +99,7 @@ int OctreeQuery::getBroadcastData(unsigned char* destinationBuffer) {
 int OctreeQuery::parseData(ReceivedMessage& message) {
  
     const unsigned char* startPosition = reinterpret_cast<const unsigned char*>(message.getRawMessage());
+    const unsigned char* endPosition = startPosition + message.getSize();
     const unsigned char* sourceBuffer = startPosition;
 
     // unpack the connection ID
@@ -133,20 +123,23 @@ int OctreeQuery::parseData(ReceivedMessage& message) {
     }
 
     // check if this query uses a view frustum
-    memcpy(&_usesFrustum, sourceBuffer, sizeof(_usesFrustum));
-    sourceBuffer += sizeof(_usesFrustum);
-    
-    if (_usesFrustum) {
-        // unpack camera details
-        memcpy(&_cameraPosition, sourceBuffer, sizeof(_cameraPosition));
-        sourceBuffer += sizeof(_cameraPosition);
-        sourceBuffer += unpackOrientationQuatFromBytes(sourceBuffer, _cameraOrientation);
-        sourceBuffer += unpackFloatAngleFromTwoByte((uint16_t*) sourceBuffer, &_cameraFov);
-        sourceBuffer += unpackFloatRatioFromTwoByte(sourceBuffer,_cameraAspectRatio);
-        sourceBuffer += unpackClipValueFromTwoByte(sourceBuffer,_cameraNearClip);
-        sourceBuffer += unpackClipValueFromTwoByte(sourceBuffer,_cameraFarClip);
-        memcpy(&_cameraEyeOffsetPosition, sourceBuffer, sizeof(_cameraEyeOffsetPosition));
-        sourceBuffer += sizeof(_cameraEyeOffsetPosition);
+    QueryFlags frustumFlags { 0 };
+    memcpy(&frustumFlags, sourceBuffer, sizeof(frustumFlags));
+    sourceBuffer += sizeof(frustumFlags);
+
+    _hasMainFrustum = frustumFlags & QUERY_HAS_MAIN_FRUSTUM;
+    _hasSecondaryFrustum = frustumFlags & QUERY_HAS_SECONDARY_FRUSTUM;
+
+    if (_hasMainFrustum) {
+        auto bytesLeft = endPosition - sourceBuffer;
+        auto byteArray = QByteArray::fromRawData(reinterpret_cast<const char*>(sourceBuffer), bytesLeft);
+        sourceBuffer += _mainViewFrustum.fromByteArray(byteArray);
+    }
+
+    if (_hasSecondaryFrustum) {
+        auto bytesLeft = endPosition - sourceBuffer;
+        auto byteArray = QByteArray::fromRawData(reinterpret_cast<const char*>(sourceBuffer), bytesLeft);
+        sourceBuffer += _secondaryViewFrustum.fromByteArray(byteArray);
     }
 
     // desired Max Octree PPS
@@ -161,9 +154,6 @@ int OctreeQuery::parseData(ReceivedMessage& message) {
     memcpy(&_boundaryLevelAdjust, sourceBuffer, sizeof(_boundaryLevelAdjust));
     sourceBuffer += sizeof(_boundaryLevelAdjust);
     
-    memcpy(&_cameraCenterRadius, sourceBuffer, sizeof(_cameraCenterRadius));
-    sourceBuffer += sizeof(_cameraCenterRadius);
-    
     // check if we have a packed JSON filter
     uint16_t binaryParametersBytes;
     memcpy(&binaryParametersBytes, sourceBuffer, sizeof(binaryParametersBytes));
@@ -184,8 +174,3 @@ int OctreeQuery::parseData(ReceivedMessage& message) {
     
     return sourceBuffer - startPosition;
 }
-
-glm::vec3 OctreeQuery::calculateCameraDirection() const {
-    glm::vec3 direction = glm::vec3(_cameraOrientation * glm::vec4(IDENTITY_FORWARD, 0.0f));
-    return direction;
-}
diff --git a/libraries/octree/src/OctreeQuery.h b/libraries/octree/src/OctreeQuery.h
index 21ce2e7fac..ef52e29f51 100644
--- a/libraries/octree/src/OctreeQuery.h
+++ b/libraries/octree/src/OctreeQuery.h
@@ -12,16 +12,14 @@
 #ifndef hifi_OctreeQuery_h
 #define hifi_OctreeQuery_h
 
-#include <inttypes.h>
-
-#include <glm/glm.hpp>
-#include <glm/gtc/quaternion.hpp>
-
 #include <QtCore/QJsonObject>
 #include <QtCore/QReadWriteLock>
 
 #include <NodeData.h>
 
+#include <ViewFrustum.h>
+
+#include "OctreeConstants.h"
 
 class OctreeQuery : public NodeData {
     Q_OBJECT
@@ -30,31 +28,22 @@ public:
     OctreeQuery(bool randomizeConnectionID = false);
     virtual ~OctreeQuery() {}
 
+    OctreeQuery(const OctreeQuery&) = delete;
+    OctreeQuery& operator=(const OctreeQuery&) = delete;
+
     int getBroadcastData(unsigned char* destinationBuffer);
     int parseData(ReceivedMessage& message) override;
 
-    // getters for camera details
-    const glm::vec3& getCameraPosition() const { return _cameraPosition; }
-    const glm::quat& getCameraOrientation() const { return _cameraOrientation; }
-    float getCameraFov() const { return _cameraFov; }
-    float getCameraAspectRatio() const { return _cameraAspectRatio; }
-    float getCameraNearClip() const { return _cameraNearClip; }
-    float getCameraFarClip() const { return _cameraFarClip; }
-    const glm::vec3& getCameraEyeOffsetPosition() const { return _cameraEyeOffsetPosition; }
-    float getCameraCenterRadius() const { return _cameraCenterRadius; }
+    bool hasMainViewFrustum() const { return _hasMainFrustum; }
+    void setMainViewFrustum(const ViewFrustum& viewFrustum) { _hasMainFrustum = true; _mainViewFrustum = viewFrustum; }
+    void clearMainViewFrustum() { _hasMainFrustum = false; }
+    const ViewFrustum& getMainViewFrustum() const { return _mainViewFrustum; }
 
-    glm::vec3 calculateCameraDirection() const;
+    bool hasSecondaryViewFrustum() const { return _hasSecondaryFrustum; }
+    void setSecondaryViewFrustum(const ViewFrustum& viewFrustum) { _hasSecondaryFrustum = true; _secondaryViewFrustum = viewFrustum; }
+    void clearSecondaryViewFrustum() { _hasSecondaryFrustum = false; }
+    const ViewFrustum& getSecondaryViewFrustum() const { return _secondaryViewFrustum; }
 
-    // setters for camera details
-    void setCameraPosition(const glm::vec3& position) { _cameraPosition = position; }
-    void setCameraOrientation(const glm::quat& orientation) { _cameraOrientation = orientation; }
-    void setCameraFov(float fov) { _cameraFov = fov; }
-    void setCameraAspectRatio(float aspectRatio) { _cameraAspectRatio = aspectRatio; }
-    void setCameraNearClip(float nearClip) { _cameraNearClip = nearClip; }
-    void setCameraFarClip(float farClip) { _cameraFarClip = farClip; }
-    void setCameraEyeOffsetPosition(const glm::vec3& eyeOffsetPosition) { _cameraEyeOffsetPosition = eyeOffsetPosition; }
-    void setCameraCenterRadius(float radius) { _cameraCenterRadius = radius; }
-    
     // getters/setters for JSON filter
     QJsonObject getJSONParameters() { QReadLocker locker { &_jsonParametersLock }; return _jsonParameters; }
     void setJSONParameters(const QJsonObject& jsonParameters)
@@ -64,9 +53,6 @@ public:
     int getMaxQueryPacketsPerSecond() const { return _maxQueryPPS; }
     float getOctreeSizeScale() const { return _octreeElementSizeScale; }
     int getBoundaryLevelAdjust() const { return _boundaryLevelAdjust; }
-    
-    bool getUsesFrustum() { return _usesFrustum; }
-    void setUsesFrustum(bool usesFrustum) { _usesFrustum = usesFrustum; }
 
     void incrementConnectionID() { ++_connectionID; }
 
@@ -81,33 +67,22 @@ public slots:
     void setBoundaryLevelAdjust(int boundaryLevelAdjust) { _boundaryLevelAdjust = boundaryLevelAdjust; }
 
 protected:
-    // camera details for the avatar
-    glm::vec3 _cameraPosition { glm::vec3(0.0f) };
-    glm::quat _cameraOrientation { glm::quat() };
-    float _cameraFov;
-    float _cameraAspectRatio;
-    float _cameraNearClip;
-    float _cameraFarClip;
-    float _cameraCenterRadius;
-    glm::vec3 _cameraEyeOffsetPosition { glm::vec3(0.0f) };
+    bool _hasMainFrustum { false };
+    ViewFrustum _mainViewFrustum;
+    bool _hasSecondaryFrustum { false };
+    ViewFrustum _secondaryViewFrustum;
 
     // octree server sending items
     int _maxQueryPPS = DEFAULT_MAX_OCTREE_PPS;
     float _octreeElementSizeScale = DEFAULT_OCTREE_SIZE_SCALE; /// used for LOD calculations
     int _boundaryLevelAdjust = 0; /// used for LOD calculations
-    
-    uint8_t _usesFrustum = true;
+
     uint16_t _connectionID; // query connection ID, randomized to start, increments with each new connection to server
     
     QJsonObject _jsonParameters;
     QReadWriteLock _jsonParametersLock;
 
     bool _hasReceivedFirstQuery { false };
-    
-private:
-    // privatize the copy constructor and assignment operator so they cannot be called
-    OctreeQuery(const OctreeQuery&);
-    OctreeQuery& operator= (const OctreeQuery&);
 };
 
 #endif // hifi_OctreeQuery_h
diff --git a/libraries/octree/src/OctreeQueryNode.cpp b/libraries/octree/src/OctreeQueryNode.cpp
index 16542b697e..d6e9343896 100644
--- a/libraries/octree/src/OctreeQueryNode.cpp
+++ b/libraries/octree/src/OctreeQueryNode.cpp
@@ -139,9 +139,14 @@ void OctreeQueryNode::writeToPacket(const unsigned char* buffer, unsigned int by
     }
 }
 
-void OctreeQueryNode::copyCurrentViewFrustum(ViewFrustum& viewOut) const {
+void OctreeQueryNode::copyCurrentMainViewFrustum(ViewFrustum& viewOut) const {
     QMutexLocker viewLocker(&_viewMutex);
-    viewOut = _currentViewFrustum;
+    viewOut = _currentMainViewFrustum;
+}
+
+void OctreeQueryNode::copyCurrentSecondaryViewFrustum(ViewFrustum& viewOut) const {
+    QMutexLocker viewLocker(&_viewMutex);
+    viewOut = _currentSecondaryViewFrustum;
 }
 
 bool OctreeQueryNode::updateCurrentViewFrustum() {
@@ -150,70 +155,50 @@ bool OctreeQueryNode::updateCurrentViewFrustum() {
         return false;
     }
     
-    if (!_usesFrustum) {
+    if (!_hasMainFrustum && !_hasSecondaryFrustum) {
         // this client does not use a view frustum so the view frustum for this query has not changed
         return false;
-    } else {
-        bool currentViewFrustumChanged = false;
-        
-        ViewFrustum newestViewFrustum;
-        // get position and orientation details from the camera
-        newestViewFrustum.setPosition(getCameraPosition());
-        newestViewFrustum.setOrientation(getCameraOrientation());
-        
-        newestViewFrustum.setCenterRadius(getCameraCenterRadius());
-        
-        // Also make sure it's got the correct lens details from the camera
-        float originalFOV = getCameraFov();
-        float wideFOV = originalFOV + VIEW_FRUSTUM_FOV_OVERSEND;
-        
-        if (0.0f != getCameraAspectRatio() &&
-            0.0f != getCameraNearClip() &&
-            0.0f != getCameraFarClip() &&
-            getCameraNearClip() != getCameraFarClip()) {
-            newestViewFrustum.setProjection(glm::perspective(
-                                                             glm::radians(wideFOV), // hack
-                                                             getCameraAspectRatio(),
-                                                             getCameraNearClip(),
-                                                             getCameraFarClip()));
-            newestViewFrustum.calculate();
-        }
-        
-        
-        { // if there has been a change, then recalculate
-            QMutexLocker viewLocker(&_viewMutex);
-            if (!newestViewFrustum.isVerySimilar(_currentViewFrustum)) {
-                _currentViewFrustum = newestViewFrustum;
-                currentViewFrustumChanged = true;
-            }
-        }
-        
-        // Also check for LOD changes from the client
-        if (_lodInitialized) {
-            if (_lastClientBoundaryLevelAdjust != getBoundaryLevelAdjust()) {
-                _lastClientBoundaryLevelAdjust = getBoundaryLevelAdjust();
-                _lodChanged = true;
-            }
-            if (_lastClientOctreeSizeScale != getOctreeSizeScale()) {
-                _lastClientOctreeSizeScale = getOctreeSizeScale();
-                _lodChanged = true;
-            }
-        } else {
-            _lodInitialized = true;
-            _lastClientOctreeSizeScale = getOctreeSizeScale();
-            _lastClientBoundaryLevelAdjust = getBoundaryLevelAdjust();
-            _lodChanged = false;
-        }
-        
-        // When we first detect that the view stopped changing, we record this.
-        // but we don't change it back to false until we've completely sent this
-        // scene.
-        if (_viewFrustumChanging && !currentViewFrustumChanged) {
-            _viewFrustumJustStoppedChanging = true;
-        }
-        _viewFrustumChanging = currentViewFrustumChanged;
-        return currentViewFrustumChanged;
     }
+
+    bool currentViewFrustumChanged = false;
+
+    { // if there has been a change, then recalculate
+        QMutexLocker viewLocker(&_viewMutex);
+        if (_hasMainFrustum && !_mainViewFrustum.isVerySimilar(_currentMainViewFrustum)) {
+            _currentMainViewFrustum = _mainViewFrustum;
+            currentViewFrustumChanged = true;
+        }
+        if (_hasSecondaryFrustum && !_secondaryViewFrustum.isVerySimilar(_currentSecondaryViewFrustum)) {
+            _currentSecondaryViewFrustum = _secondaryViewFrustum;
+            currentViewFrustumChanged = true;
+        }
+    }
+
+    // Also check for LOD changes from the client
+    if (_lodInitialized) {
+        if (_lastClientBoundaryLevelAdjust != getBoundaryLevelAdjust()) {
+            _lastClientBoundaryLevelAdjust = getBoundaryLevelAdjust();
+            _lodChanged = true;
+        }
+        if (_lastClientOctreeSizeScale != getOctreeSizeScale()) {
+            _lastClientOctreeSizeScale = getOctreeSizeScale();
+            _lodChanged = true;
+        }
+    } else {
+        _lodInitialized = true;
+        _lastClientOctreeSizeScale = getOctreeSizeScale();
+        _lastClientBoundaryLevelAdjust = getBoundaryLevelAdjust();
+        _lodChanged = false;
+    }
+
+    // When we first detect that the view stopped changing, we record this.
+    // but we don't change it back to false until we've completely sent this
+    // scene.
+    if (_viewFrustumChanging && !currentViewFrustumChanged) {
+        _viewFrustumJustStoppedChanging = true;
+    }
+    _viewFrustumChanging = currentViewFrustumChanged;
+    return currentViewFrustumChanged;
 }
 
 void OctreeQueryNode::setViewSent(bool viewSent) {
diff --git a/libraries/octree/src/OctreeQueryNode.h b/libraries/octree/src/OctreeQueryNode.h
index 640a7c7ddc..d8f05c4043 100644
--- a/libraries/octree/src/OctreeQueryNode.h
+++ b/libraries/octree/src/OctreeQueryNode.h
@@ -49,7 +49,8 @@ public:
 
     OctreeElementExtraEncodeData extraEncodeData;
 
-    void copyCurrentViewFrustum(ViewFrustum& viewOut) const;
+    void copyCurrentMainViewFrustum(ViewFrustum& viewOut) const;
+    void copyCurrentSecondaryViewFrustum(ViewFrustum& viewOut) const;
 
     // These are not classic setters because they are calculating and maintaining state
     // which is set asynchronously through the network receive
@@ -87,9 +88,6 @@ public:
     void setShouldForceFullScene(bool shouldForceFullScene) { _shouldForceFullScene = shouldForceFullScene; }
 
 private:
-    OctreeQueryNode(const OctreeQueryNode &);
-    OctreeQueryNode& operator= (const OctreeQueryNode&);
-
     bool _viewSent { false };
     std::unique_ptr<NLPacket> _octreePacket;
     bool _octreePacketWaiting;
@@ -99,7 +97,8 @@ private:
     quint64 _firstSuppressedPacket { usecTimestampNow() };
 
     mutable QMutex _viewMutex { QMutex::Recursive };
-    ViewFrustum _currentViewFrustum;
+    ViewFrustum _currentMainViewFrustum;
+    ViewFrustum _currentSecondaryViewFrustum;
     bool _viewFrustumChanging { false };
     bool _viewFrustumJustStoppedChanging { true };
 
diff --git a/libraries/octree/src/OctreeUtils.cpp b/libraries/octree/src/OctreeUtils.cpp
index 8980504431..8eaf22e198 100644
--- a/libraries/octree/src/OctreeUtils.cpp
+++ b/libraries/octree/src/OctreeUtils.cpp
@@ -16,6 +16,7 @@
 #include <glm/glm.hpp>
 
 #include <AABox.h>
+#include <AACube.h>
 
 float calculateRenderAccuracy(const glm::vec3& position,
         const AABox& bounds,
@@ -73,4 +74,10 @@ float getOrthographicAccuracySize(float octreeSizeScale, int boundaryLevelAdjust
     // Smallest visible element is 1cm
     const float smallestSize = 0.01f;
     return (smallestSize * MAX_VISIBILITY_DISTANCE_FOR_UNIT_ELEMENT) / boundaryDistanceForRenderLevel(boundaryLevelAdjust, octreeSizeScale);
-}
\ No newline at end of file
+}
+
+bool isAngularSizeBigEnough(glm::vec3 position, const AACube& cube, float lodScaleFactor, float minDiameter) {
+    float distance = glm::distance(cube.calcCenter(), position) + MIN_VISIBLE_DISTANCE;
+    float angularDiameter = cube.getScale() / distance;
+    return angularDiameter > minDiameter * lodScaleFactor;
+}
diff --git a/libraries/octree/src/OctreeUtils.h b/libraries/octree/src/OctreeUtils.h
index d5008376ea..58ab366d8d 100644
--- a/libraries/octree/src/OctreeUtils.h
+++ b/libraries/octree/src/OctreeUtils.h
@@ -15,6 +15,7 @@
 #include "OctreeConstants.h"
 
 class AABox;
+class AACube;
 class QJsonDocument;
 
 /// renderAccuracy represents a floating point "visibility" of an object based on it's view from the camera. At a simple
@@ -36,4 +37,6 @@ const float SQRT_THREE = 1.73205080f;
 const float MIN_ENTITY_ANGULAR_DIAMETER = MIN_ELEMENT_ANGULAR_DIAMETER * SQRT_THREE;
 const float MIN_VISIBLE_DISTANCE = 0.0001f; // helps avoid divide-by-zero check
 
+bool isAngularSizeBigEnough(glm::vec3 position, const AACube& cube, float lodScaleFactor, float minDiameter);
+
 #endif // hifi_OctreeUtils_h
diff --git a/libraries/render-utils/src/AbstractViewStateInterface.h b/libraries/render-utils/src/AbstractViewStateInterface.h
index 54fdc903ca..9d781b7d18 100644
--- a/libraries/render-utils/src/AbstractViewStateInterface.h
+++ b/libraries/render-utils/src/AbstractViewStateInterface.h
@@ -31,6 +31,10 @@ public:
     /// copies the current view frustum for rendering the view state
     virtual void copyCurrentViewFrustum(ViewFrustum& viewOut) const = 0;
 
+    virtual void copyViewFrustum(ViewFrustum& viewOut) const = 0;
+    virtual void copySecondaryViewFrustum(ViewFrustum& viewOut) const = 0;
+    virtual bool hasSecondaryViewFrustum() const = 0;
+
     virtual QThread* getMainThread() = 0;
 
     virtual PickRay computePickRay(float x, float y) const = 0;
diff --git a/libraries/shared/src/CrashHelpers.cpp b/libraries/shared/src/CrashHelpers.cpp
new file mode 100644
index 0000000000..f8ca90bc4c
--- /dev/null
+++ b/libraries/shared/src/CrashHelpers.cpp
@@ -0,0 +1,77 @@
+//
+//  CrashHelpers.cpp
+//  libraries/shared/src
+//
+//  Created by Clement Brisset on 4/30/18.
+//  Copyright 2018 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#include "CrashHelpers.h"
+
+namespace crash {
+
+class B;
+class A {
+public:
+    A(B* b) : _b(b) { }
+    ~A();
+    virtual void virtualFunction() = 0;
+
+private:
+    B* _b;
+};
+
+class B : public A {
+public:
+    B() : A(this) { }
+    virtual void virtualFunction() override { }
+};
+
+A::~A() {
+    _b->virtualFunction();
+}
+
+void pureVirtualCall() {
+    qCDebug(shared) << "About to make a pure virtual call";
+    B b;
+}
+
+void doubleFree() {
+    qCDebug(shared) << "About to double delete memory";
+    int* blah = new int(200);
+    delete blah;
+    delete blah;
+}
+
+void nullDeref() {
+    qCDebug(shared) << "About to dereference a null pointer";
+    int* p = nullptr;
+    *p = 1;
+}
+
+void doAbort() {
+    qCDebug(shared) << "About to abort";
+    abort();
+}
+
+void outOfBoundsVectorCrash() {
+    qCDebug(shared) << "std::vector out of bounds crash!";
+    std::vector<int> v;
+    v[0] = 42;
+}
+
+void newFault() {
+    qCDebug(shared) << "About to crash inside new fault";
+
+    // Force crash with multiple large allocations
+    while (true) {
+        const size_t GIGABYTE = 1024 * 1024 * 1024;
+        new char[GIGABYTE];
+    }
+
+}
+    
+}
diff --git a/libraries/shared/src/CrashHelpers.h b/libraries/shared/src/CrashHelpers.h
index 1cc6749182..ad988c8906 100644
--- a/libraries/shared/src/CrashHelpers.h
+++ b/libraries/shared/src/CrashHelpers.h
@@ -18,66 +18,12 @@
 
 namespace crash {
 
-class B;
-class A {
-public:
-    A(B* b) : _b(b) { }
-    ~A();
-    virtual void virtualFunction() = 0;
-
-private:
-    B* _b;
-};
-
-class B : public A {
-public:
-    B() : A(this) { }
-    virtual void virtualFunction() override { }
-};
-
-A::~A() {
-    _b->virtualFunction();
-}
-
-void pureVirtualCall() {
-    qCDebug(shared) << "About to make a pure virtual call";
-    B b;
-}
-    
-void doubleFree() {
-    qCDebug(shared) << "About to double delete memory";
-    int* blah = new int(200);
-    delete blah;
-    delete blah;
-}
-
-void nullDeref() {
-    qCDebug(shared) << "About to dereference a null pointer";
-    int* p = nullptr;
-    *p = 1;
-}
-
-void doAbort() {
-    qCDebug(shared) << "About to abort";
-    abort();
-}
-
-void outOfBoundsVectorCrash() {
-    qCDebug(shared) << "std::vector out of bounds crash!";
-    std::vector<int> v;
-    v[0] = 42;
-}
-
-void newFault() {
-    qCDebug(shared) << "About to crash inside new fault";
-
-    // Force crash with multiple large allocations
-    while (true) {
-        const size_t GIGABYTE = 1024 * 1024 * 1024;
-        new char[GIGABYTE];
-    }
-
-}
+void pureVirtualCall();
+void doubleFree();
+void nullDeref();
+void doAbort();
+void outOfBoundsVectorCrash();
+void newFault();
 
 }
 
diff --git a/libraries/shared/src/PrioritySortUtil.h b/libraries/shared/src/PrioritySortUtil.h
index 279fa42ea4..ba15222611 100644
--- a/libraries/shared/src/PrioritySortUtil.h
+++ b/libraries/shared/src/PrioritySortUtil.h
@@ -84,14 +84,12 @@ namespace PrioritySortUtil {
     class PriorityQueue {
     public:
         PriorityQueue() = delete;
-
-        PriorityQueue(const ViewFrustum& view) : _view(view) { }
-
-        PriorityQueue(const ViewFrustum& view, float angularWeight, float centerWeight, float ageWeight)
-                : _view(view), _angularWeight(angularWeight), _centerWeight(centerWeight), _ageWeight(ageWeight)
+        PriorityQueue(const ViewFrustums& views) : _views(views) { }
+        PriorityQueue(const ViewFrustums& views, float angularWeight, float centerWeight, float ageWeight)
+                : _views(views), _angularWeight(angularWeight), _centerWeight(centerWeight), _ageWeight(ageWeight)
         { }
 
-        void setView(const ViewFrustum& view) { _view = view; }
+        void setViews(const ViewFrustums& views) { _views = views; }
 
         void setWeights(float angularWeight, float centerWeight, float ageWeight) {
             _angularWeight = angularWeight;
@@ -109,7 +107,18 @@ namespace PrioritySortUtil {
         bool empty() const { return _queue.empty(); }
 
     private:
+
         float computePriority(const T& thing) const {
+            float priority = std::numeric_limits<float>::min();
+
+            for (const auto& view : _views) {
+                priority = std::max(priority, computePriority(view, thing));
+            }
+
+            return priority;
+        }
+
+        float computePriority(const ViewFrustum& view, const T& thing) const {
             // priority = weighted linear combination of multiple values:
             //   (a) angular size
             //   (b) proximity to center of view
@@ -117,11 +126,11 @@ namespace PrioritySortUtil {
             // where the relative "weights" are tuned to scale the contributing values into units of "priority".
 
             glm::vec3 position = thing.getPosition();
-            glm::vec3 offset = position - _view.getPosition();
+            glm::vec3 offset = position - view.getPosition();
             float distance = glm::length(offset) + 0.001f; // add 1mm to avoid divide by zero
             const float MIN_RADIUS = 0.1f; // WORKAROUND for zero size objects (we still want them to sort by distance)
             float radius = glm::min(thing.getRadius(), MIN_RADIUS);
-            float cosineAngle = (glm::dot(offset, _view.getDirection()) / distance);
+            float cosineAngle = (glm::dot(offset, view.getDirection()) / distance);
             float age = (float)(usecTimestampNow() - thing.getTimestamp());
 
             // we modulatate "age" drift rate by the cosineAngle term to make periphrial objects sort forward
@@ -134,8 +143,8 @@ namespace PrioritySortUtil {
                 + _ageWeight * cosineAngleFactor * age;
 
             // decrement priority of things outside keyhole
-            if (distance - radius > _view.getCenterRadius()) {
-                if (!_view.sphereIntersectsFrustum(position, radius)) {
+            if (distance - radius > view.getCenterRadius()) {
+                if (!view.sphereIntersectsFrustum(position, radius)) {
                     constexpr float OUT_OF_VIEW_PENALTY = -10.0f;
                     priority += OUT_OF_VIEW_PENALTY;
                 }
@@ -143,7 +152,7 @@ namespace PrioritySortUtil {
             return priority;
         }
 
-        ViewFrustum _view;
+        ViewFrustums _views;
         std::priority_queue<T> _queue;
         float _angularWeight { DEFAULT_ANGULAR_COEF };
         float _centerWeight { DEFAULT_CENTER_COEF };
diff --git a/libraries/shared/src/ViewFrustum.cpp b/libraries/shared/src/ViewFrustum.cpp
index 2a2eebc0a7..c2b92aac5f 100644
--- a/libraries/shared/src/ViewFrustum.cpp
+++ b/libraries/shared/src/ViewFrustum.cpp
@@ -75,6 +75,10 @@ void ViewFrustum::setProjection(const glm::mat4& projection) {
     _width = _corners[TOP_RIGHT_NEAR].x - _corners[TOP_LEFT_NEAR].x;
 }
 
+void ViewFrustum::setProjection(float cameraFov, float cameraAspectRatio, float cameraNearClip, float cameraFarClip) {
+    setProjection(glm::perspective(glm::radians(cameraFov), cameraAspectRatio, cameraNearClip, cameraFarClip));
+}
+
 // ViewFrustum::calculate()
 //
 // Description: this will calculate the view frustum bounds for a given position and direction
@@ -134,7 +138,7 @@ const char* ViewFrustum::debugPlaneName (int plane) const {
     return "Unknown";
 }
 
-void ViewFrustum::fromByteArray(const QByteArray& input) {
+int ViewFrustum::fromByteArray(const QByteArray& input) {
 
     // From the wire!
     glm::vec3 cameraPosition;
@@ -168,14 +172,12 @@ void ViewFrustum::fromByteArray(const QByteArray& input) {
         0.0f != cameraNearClip &&
         0.0f != cameraFarClip &&
         cameraNearClip != cameraFarClip) {
-        setProjection(glm::perspective(
-            glm::radians(cameraFov),
-            cameraAspectRatio,
-            cameraNearClip,
-            cameraFarClip));
 
+        setProjection(cameraFov, cameraAspectRatio, cameraNearClip, cameraFarClip);
         calculate();
     }
+
+    return sourceBuffer - startPosition;
 }
 
 
diff --git a/libraries/shared/src/ViewFrustum.h b/libraries/shared/src/ViewFrustum.h
index 981aabe70c..128a717df8 100644
--- a/libraries/shared/src/ViewFrustum.h
+++ b/libraries/shared/src/ViewFrustum.h
@@ -48,6 +48,7 @@ public:
 
     // setters for lens attributes
     void setProjection(const glm::mat4 & projection);
+    void setProjection(float cameraFov, float cameraAspectRatio, float cameraNearClip, float cameraFarClip);
     void setFocalLength(float focalLength) { _focalLength = focalLength; }
     bool isPerspective() const;
 
@@ -147,7 +148,7 @@ public:
     void invalidate(); // causes all reasonable intersection tests to fail
 
     QByteArray toByteArray();
-    void fromByteArray(const QByteArray& input);
+    int fromByteArray(const QByteArray& input);
 
 private:
     glm::mat4 _view;
@@ -188,5 +189,6 @@ private:
 
 };
 using ViewFrustumPointer = std::shared_ptr<ViewFrustum>;
+using ViewFrustums = std::vector<ViewFrustum>;
 
 #endif // hifi_ViewFrustum_h
diff --git a/tests/render-perf/src/main.cpp b/tests/render-perf/src/main.cpp
index 9249b3d957..8c17d7c5c2 100644
--- a/tests/render-perf/src/main.cpp
+++ b/tests/render-perf/src/main.cpp
@@ -441,6 +441,16 @@ protected:
         viewOut = _viewFrustum;
     }
 
+    void copyViewFrustum(ViewFrustum& viewOut) const override {
+        viewOut = _viewFrustum;
+    }
+
+    void copySecondaryViewFrustum(ViewFrustum& viewOut) const override {}
+
+    bool hasSecondaryViewFrustum() const override {
+        return false;
+    }
+
     QThread* getMainThread() override {
         return QThread::currentThread();
     }