Re-implement relative motion.

Assets/Cryville/Crtr/ChartPlayer.cs

@@ -158,6 +158,8 @@ namespace Cryville.Crtr {
 				UnityEngine.Profiling.Profiler.EndSample();
 				actualRenderStep = step;
 
+				nbus.PreAnchor();
+				nbus.StripTempEvents();
 				nbus.ForwardStepByTime(clippingDist, step);
 				nbus.EndPreGraphicalUpdate();
 				nbus.Anchor();