VR_ASSERT_MESSAGE(model1->getCollisionChecker()==model2->getCollisionChecker(),"Collision models are linked to different Collision Checker instances");
VR_ASSERT_MESSAGE(model1->getCollisionChecker()==shared_from_this(),"Collision models are linked to different Collision Checker instances");
VR_ASSERT(isInitialized());
THROW_VR_EXCEPTION_IF(!isInitialized(),"checker not initialized");