[vtkusers] Transparent vtkImagePlaneWidget doesn't show volume render behind it

[BKleinHaneveld]

If a transparent vtkImagePlaneWidget is in front of a volume, it occludes it.
The following image shows a vtkImagePlaneWidget intersecting with a
vtkOpenGLGPUVolumeRayCastMapper. In the middle of the volume is a block that
should be visible through the plane because of the transparency, but is
actually occluded.

<http://vtk.1045678.n5.nabble.com/file/n5725468/Screen_Shot_2014-01-17_at_11.22.22_.png> 

Is there a way to overcome this? Is there a way to adjust the order of
rendering? Is it even possible to fix this without altering vtk?

Berend



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