[vtkusers] Question about volume rendering

[Yuanchao Zhang]

 Hi, experts,

I am not quite familar with volume rendering using
vtk. I want to overlay one mask image onto another volume and render
them simutaneously. I know vtkGPUVolumeRayCastMapper allows to input a
mask image, this class however requires OPENGL 2 which is not
supported for my computer. Is there any other way to achieve this? Is
there any example for this?

Thanks a lot!

Yuanchao
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