[vtkusers] prevent vtkVolumeRayCastMapper from recomputing when its input is not changed

[Tracy Hu]

I have a actor using vtkVolumeRayCastMapper. Whenever I manipulate the actor with mouse 
or just click anywhere on screen, the vtkVolumeRayCastMapper will recompute itself. I turned 
off its ReleaseDataFlag, but still can't stop it from recomputing. Is there a way to stop 
vtkVolumeRayCastMapper from doing computation when it's input is not changed?


Thanks for any hint

Tracy



      
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