////  EntityTreeHeadlessViewer.cpp//  libraries/models/src////  Created by Brad Hefta-Gaub on 2/26/14.//  Copyright 2014 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 "EntityTreeHeadlessViewer.h"#include "SimpleEntitySimulation.h" EntityTreeHeadlessViewer::EntityTreeHeadlessViewer()    :   OctreeHeadlessViewer(), _simulation(NULL) {} EntityTreeHeadlessViewer::~EntityTreeHeadlessViewer() {    if (_simulation) {        _simulation->setEntityTree(nullptr);  // Break shared_ptr cycle.    }} void EntityTreeHeadlessViewer::init() {    OctreeHeadlessViewer::init();    if (!_simulation) {        SimpleEntitySimulationPointer simpleSimulation { new SimpleEntitySimulation() };        EntityTreePointer entityTree = std::static_pointer_cast<EntityTree>(_tree);        simpleSimulation->setEntityTree(entityTree);        entityTree->setSimulation(simpleSimulation);        _simulation = simpleSimulation;    }} void EntityTreeHeadlessViewer::update() {    if (_tree) {        EntityTreePointer tree = std::static_pointer_cast<EntityTree>(_tree);        tree->withTryWriteLock([&] {            tree->preUpdate();            tree->update();        });    }} void EntityTreeHeadlessViewer::processEraseMessage(ReceivedMessage& message, const SharedNodePointer& sourceNode) {    std::static_pointer_cast<EntityTree>(_tree)->processEraseMessage(message, sourceNode);}