////  EntitySimulation.cpp//  libraries/entities/src////  Created by Andrew Meadows on 2014.11.24//  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 "EntitySimulation.h" void EntitySimulation::setEntityTree(EntityTree* tree) {    if (_entityTree && _entityTree != tree) {        clearEntities();    }    _entityTree = tree;}