[vtkusers] real time volume rendering

[MHT sky]

Hi all,
I want to use vtk to do the real time volume rendering...and I see the vtkVolumeRayCastMapper can do this...but with functions inside vtk, how can I specify that which gpu I'm using (I have two in my machine and want to use one to do rendering directly...) and realize the real time effect?
Thank you in advance!!Crystal 		 	   		  
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