[vtkusers] How to improve the speed of volume rendering?

[MarkZ. J.]

Hi, vtk users,
   VTK is a very good tool to implement the volume rendering, however, when the number of the images is very large(for example, 150 or several hundred), the volume rendering would be very very slow, so, is there any good method to improve the speed of volume rendering? any idea would be appreciated!
    Mark 
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