[vtkusers] Glitch in rendering when using vtkGPUVolumeRayCastMapper in 7.0.0

[Elvis Stansvik]

Hi all,

When I view my volume from certain angles, there are glitches in the
rendering when using vtkGPUVolumeRayCastMapper , see attached screenshots
when the glitch is occurring and when it is not.

Has anyone seen this behavior and know what the problem might be? This is
on Intel HD 4400 graphics.

I would love to be able to use the GPU volume mapper since it's so much
faster than the software one.

Thanks,
Elvis
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