[Paraview] How to change the default mapper for 3d volume rendering?

[Biao She]

Thanks to this mailing list, I know how to make Paraview read the DICOM
files right now.
However, the volume rendering speed is not satisfactory. I am wondering if I
want to use vtkOpenGLVolumeTextureMapper3d for the volume rendering, how
should I change paraview's code? Moreover, if I want to use my own GPU-based
volume rendering algorithm in Paraview, how should I do it? Or is that
possible?

Thanks very much!

Aaron
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