void PhysicalEntitySimulation::getObjectsToAddToPhysics(VectorOfMotionStates& result) {
    result.clear();
    QMutexLocker lock(&_mutex);
    SetOfEntities::iterator entityItr = _entitiesToAddToPhysics.begin();
    while (entityItr != _entitiesToAddToPhysics.end()) {
        EntityItemPointer entity = (*entityItr);
        assert(!entity->getPhysicsInfo());
        if (entity->isDead()) {
            prepareEntityForDelete(entity);
        } else if (!entity->shouldBePhysical()) {
            // this entity should no longer be on the internal _entitiesToAddToPhysics
            entityItr = _entitiesToAddToPhysics.erase(entityItr);
            if (entity->isMoving()) {
                _simpleKinematicEntities.insert(entity);
            }
        } else if (entity->isReadyToComputeShape()) {
            ShapeInfo shapeInfo;
            entity->computeShapeInfo(shapeInfo);
            btCollisionShape* shape = ObjectMotionState::getShapeManager()->getShape(shapeInfo);
            if (shape) {
                EntityMotionState* motionState = new EntityMotionState(shape, entity);
                entity->setPhysicsInfo(static_cast<void*>(motionState));
                _physicalObjects.insert(motionState);
                result.push_back(motionState);
                entityItr = _entitiesToAddToPhysics.erase(entityItr);
            } else {
                //qDebug() << "Warning!  Failed to generate new shape for entity." << entity->getName();
                ++entityItr;
            }
        } else {
            ++entityItr;
        }
    }
}
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void EntitySimulation::prepareEntityForDelete(EntityItemPointer entity) {
    assert(entity);
    assert(entity->isDead());
    if (entity->isSimulated()) {
        QMutexLocker lock(&_mutex);
        entity->clearActions(getThisPointer());
        removeEntityInternal(entity);
        _entitiesToDelete.insert(entity);
    }
}
void PhysicalEntitySimulation::addEntityInternal(EntityItemPointer entity) {
    QMutexLocker lock(&_mutex);
    assert(entity);
    assert(!entity->isDead());
    if (entity->shouldBePhysical()) {
        EntityMotionState* motionState = static_cast<EntityMotionState*>(entity->getPhysicsInfo());
        if (!motionState) {
            _entitiesToAddToPhysics.insert(entity);
        }
    } else if (entity->isMoving()) {
        _simpleKinematicEntities.insert(entity);
    }
}
// virtual
void PhysicalEntitySimulation::prepareEntityForDelete(EntityItemPointer entity) {
    assert(entity);
    assert(entity->isDead());
    entity->clearActions(this);
    removeEntityInternal(entity);
}