[vtkusers] Glitch in rendering when using vtkGPUVolumeRayCastMapper in 7.0.0

[Elvis Stansvik]

2016-05-26 14:01 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:

> 2016-05-26 13:46 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
>
>> 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.
>>
>
> If it's not quite clear, the glitch is at the bottom of the first
> screenshot, where an are of the volume is not visible.
>

An observation: I had the following to enable parallell projection in my
code:

    self.camera.ParallelProjectionOn()

If I remove this line, so that perspective projection is used instead, the
glitches disappear.

This is not a solution, since I need to use parallell projection, but maybe
it's a clue to the problem?

Elvis


> From certain angles the volume disappears almost completely.
>
> Elvis
>
>
>>
>> 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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