[vtkusers] rendering otimized of volumes

[Héber de Padua Sousa]

Hello users,
When I rotate the volume in a visualization 3D using vtkVolumeRayCastMapper,
the visualization of the volume get less definition.
I would like to know how I put this appearance at the moment that I want.
This way I could make my process faster
is there some method?

-- 
>> Héber
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