[vtkusers] How to improve the volume rendering's speed?

[JohnMark]

Hi, vtk users,
    now I am doing volume rendering with ray casting method. but I find it is very slow especially when the image number is more than one hundred, and I want to improve the volume rendering's speed, is there any good idea to do it? any idea would be appreciated~
    and thank you very much!
    Mark
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