Method onTickPreRender

physx/samples/samplevehicle/SampleVehicle.cpp:576–694

void SampleVehicle::onTickPreRender(PxF32 dtime)
{
	mScene->lockWrite();
	if(mFixCar)
	{
		//Get the transform of the last crossed waypoint and reset the player car 
		//at this transform.  
		resetFocusVehicleAtWaypoint();
		mFixCar=false;
		//Reset the control logic driving the car back to start state to avoid mismatch
		//between vehicle gears and state stored in vehicle controller.
		mVehicleController.clear();
#if PX_DEBUG_VEHICLE_ON
		//Clear all the graph data because the discontinuity in car position makes the stored data redundant.
		clearTelemetryData();
#endif
	}
	else if(mBackToStart)
	{
		//Set the progress back to zero.
		mWayPoints.setBackAtStart();
		//Get the transform of the last crossed waypoint (this will now be the start
		//waypoint) and reset the player car at this transform.
		resetFocusVehicleAtWaypoint();
		mBackToStart=false;
		//Reset the control logic driving the car back to start state to avoid mismatch
		//between vehicle gears and state stored in vehicle controller.
		mVehicleController.clear();
#if PX_DEBUG_VEHICLE_ON
		//Clear all the graph data because the discontinuity in car position makes the stored data redundant.
		clearTelemetryData();
#endif
	}

	//Only switch to 3-wheeled if driving a 4-wheeled car.
	if(ePLAYER_VEHICLE_TYPE_VEHICLE4W==mPlayerVehicleType)
	{
		if(m3WModeIncremented)
		{
			const PxU32 old3WMode=m3WMode;
			const PxU32 new3WMode=(m3WMode+1)%3;
			if(0==old3WMode && 1==new3WMode)
			{
				mVehicleManager.switchTo3WDeltaMode(mPlayerVehicle);
			}
			else if(1==old3WMode && 2==new3WMode)
			{
				mVehicleManager.switchTo3WTadpoleMode(mPlayerVehicle);
			}
			else if(2==old3WMode && 0==new3WMode)
			{
				mVehicleManager.switchTo4WMode(mPlayerVehicle);
			}
			m3WModeIncremented=false;
			m3WMode=new3WMode;
		}
	}