[vtkusers] Trouble using vtkVolume in same renderer as vtkSphereSource

[Rhys Thomas]

Hello vtkusers

I was wondering if anyone could help me resolve the following problem; I 
am attempting to display a sphere and a volume inside the same renderer, 
however when I do this the volume appears to pulsate slightly and the 
image of the sphere looks complete, then incomplete (almost like a 
hemisphere viewed looking at the flat surface) in alternate frames. The 
complete sphere is displayed in front of or co-incident with the volume 
when I intend it to when the full sphere is being rendered only. In the 
case where a hemisphere is being rendered, it always appears behind the 
volume. The problem with the volume is not of major concern, however I 
felt that I should mention it as it may be a symptom of the problem that 
is afflicting the sphere.
    The volume was created from structured points, added to a 
vtkVolumeTextureMapper2D (although I have also used 
vtkVolumeRayCastMapper with similar results), then to a vtkVolume. I 
created the sphere using vtkSphereSource, added it to a 
vtkPolyDataMapper, which was subsequently added to a vtkActor. The 
vtkVolume and vtkActor were then added to a vtkRenderer, which was then 
added to a vtkRenderWindow.
    I am using vtk version 5.0, Visual Studio 6, and Windows XP. I 
should perhaps also mention that the I am also using the ARToolkit in my 
program.

Thanks

Rhys Thomas