protected override void OnFrameStarted( object source, FrameEventArgs evt )
{
base.OnFrameStarted( source, evt );
if ( evt.StopRendering )
return;
// make sure reflection camera is updated too
reflectCam.Orientation = camera.Orientation;
reflectCam.Position = camera.Position;
// rotate plane
planeNode.Yaw( 30 * evt.TimeSinceLastFrame, TransformSpace.Parent );
}