// trigger
	m_ActElevatorTriggerDownPtr = new PhysicsActor(ELEVATOR_DOWN_TRIGGER_POS, 0.0, BodyType::KINEMATIC);
	m_ActElevatorTriggerDownPtr->AddBoxShape(TRIGGER_WIDTH, TRIGGER_HEIGHT);
	m_ActElevatorTriggerDownPtr->SetTrigger(true);
	m_ActElevatorTriggerDownPtr->AddContactListener(this);

	m_ActElevatorTriggerUpPtr = new PhysicsActor(ELEVATOR_UP_TRIGGER_POS, 0.0, BodyType::KINEMATIC);
	m_ActElevatorTriggerUpPtr->AddBoxShape(TRIGGER_WIDTH, TRIGGER_HEIGHT);
	m_ActElevatorTriggerUpPtr->SetTrigger(true);
	m_ActElevatorTriggerUpPtr->AddContactListener(this);

	// actors
	m_ActElevatorFloorPtr = new PhysicsActor(ELEVATOR_FLOOR_POS, 0.0, BodyType::KINEMATIC);
	m_ActElevatorFloorPtr->AddBoxShape(FLOOR_WIDTH, FLOOR_HEIGHT);

	m_ActElevatorPtr = new PhysicsActor(ELEVATOR_POS, 0.0, BodyType::KINEMATIC);
	m_ActElevatorPtr->AddBoxShape(ELEVATOR_WIDTH, ELEVATOR_HEIGHT,0.0);

	// joint

	m_PrismaJointPtr = new PhysicsPrismaticJoint(m_ActElevatorPtr, DOUBLE2(0, 0), m_ActElevatorFloorPtr, DOUBLE2(0, 0), DOUBLE2(0, -1), true);

	m_PrismaJointPtr->EnableJointLimits(true, ELEVATOR_LOWER_LIMIT, ELEVATOR_HIGHER_LIMIT);

	m_PrismaJointPtr->EnableMotor(true, MOTOR_TARGET_SPEED, MOTOR_TORQUE);