[osg-users] Vertex Shader and Culling

[Kim C Bale]

Hi all,
 
 
I'm having trouble with a vertex shader I've written. I've created some geometry at 0,0,0 then use a vertex shader to translate and scale that into position within the scene. As I move the camera, the geode seems to disappear out of view as if it were being culled. 
 
I presume this is because I am modifying the position of these vertices in the shader. OSG cannot recompute it's bounding box and therefore culls it based on it's original position and size.
 
So, i have tried to remove the geode from the culling tests using the "->setCullingActive()" function however it doesn't seem to have any effect. I have also tried to completely disable culling via the command "viewer.getCamera()->setCullingMode()".with no success.
 
Is there something I have missed here? A quick trawl of the forum doesn't seem to answer it. 
 
Any help is gratefully recieved,
 
 
Kim.
 
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