[Paraview] Changing the default volume mapper in Paraview?

[Biao She]

Hi everyone.
I have debugged paraview for days. The reason is that I want to use
vtkOpenGLVolumeTextureMapper3d mapper instead of the default volume mapper
vtkFixedPointVolumeRayCastMapper in Paraview.
Till now, I haven't figured out how to do that. Has anyone done this before?
Any hint and help is greatly appreciated.
Thanks,

Aaron
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