[Paraview] change default unstructured volume mapper in paraview

[胡健]

hi everybody:
  firstly, I want to ask that can we change default unstructured volume
mapper in paraview. I find that paraview use
vtkProjectedTetrahedraVolumeMapper to do unstructured volume rendering. I
want to use vtkHAVSVolumeMapper or vtkOpenGLHAVSVolumeMapper instead. Can we
do it in paraview? Secondly, I change the rendering.xml in paraview source
code. I change ProjectedTetrahedraVolumeMapper of subproxy vtkPTMapper to
HAVSVolumeMapper or OpenGLHAVSVolumeMapper, but when I use volume rendering
in Paraviewl, the result image is wrong, I don't know why. Anybody know?
thank you in advance!
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