[vtkusers] Combining volumes and transparent

Lisa S. Avila lisa.avila at kitware.com
Mon Sep 10 13:49:04 EDT 2001

Hello Jiro,

Yes - the VolumePro mapper (and the volume texture mapper and volume ray 
cast mapper) all were trashing the OpenGL state by disabling blending. I 
fixed this and just checked it in. You can simply remove the enable/disable 
calls from vtkOpenGLVolumeProVG500Mapper if you don't want to update.


At 11:28 AM 9/10/2001, Jiro Inoue wrote:
>I have multiple vtkActors and vtkVolumes set as inputs to a single
>vtkRenderer. I'm using volumepro 500 hardware with the vtkVolumeProMapper
>for my volumes and vtkPolyDataMapper for the actors. My problem is that my
>actors have transparency (opacity of 0.2), which works fine until I
>introduce a volume into the scene. As soon as the volume is placed in the
>scene, all of my actors become fully opaque - the volume on the other hand
>maintains the correct opacity characteristics.
>Has anybody else seen this? Any insights?
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