<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">I have a actor using vtkVolumeRayCastMapper. Whenever I manipulate the actor with mouse <br>or just click anywhere on screen, the vtkVolumeRayCastMapper will recompute itself. I turned <br>off its ReleaseDataFlag, but still can't stop it from recomputing. Is there a way to stop <br>vtkVolumeRayCastMapper from doing computation when it's input is not changed?<br><br><br>Thanks for any hint<br><br>Tracy<br></td></tr></table><br>