[vtkusers] intersection between the polydata and volume

[qwcbeyond]

Hi,Bill. Thanks for your response. I tried your method to determine whether
the voxels in the polydata, but the only problem is  it's too  slow. I use
the  volume data(512*512*2)  to test this method, it takes several minutes.
If I use the 512*512*365 volume data,it will take me a long time.

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