[vtkusers] Differences Result between CPU rendering and GPU rendering with VTK

[Stephen Zucker]

Dear All, 

When i use same colorFunction、scalarOpacity, gradientOpacity to render the
same Medical Image data, I found the rendered result of 
CPU(vtkFixedPointVolumeRayCastMapper) and GPU(vtkGPUVolumeRayCastMapper) are
different.
I think the CPU rendered result is better then GPU，the GPU rendered result
has too many colourful spots and ribbon. But with GPU rendering, the
operation is smoother.
The rendered result is as follows:
<http://vtk.1045678.n5.nabble.com/file/t342362/CPU.png> 
<http://vtk.1045678.n5.nabble.com/file/t342362/GPU.png> 

So can you help me to improve the rendering effect of the GPU?

Thanks in advance, 

Zucker. 



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