[vtkusers] Combining volumes and transparent

Jianlong Zhou zhou at isg.cs.uni-magdeburg.de
Thu Sep 13 12:03:05 EDT 2001

Hi, all,
I also have a problem as Jiro stated of actor not display transparent 
when adding volume. But I use vtkVolumeRayCastMapper. Does 
anyone know how to solve this problem? I use vtk3.2.
Thank you in advance.


> 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.
> Lisa
> At 11:28 AM 9/10/2001, Jiro Inoue wrote:
> >Hi,
> >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?
> >
> >Thanks,
> >Jiro
> >
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