[vtkusers] vtkCSCS PointSpriteMapper integration

[Alex]

Hello,
	
I use vtkPointSpriteMapper to display scattered points as spheres.
When I use the ExactSphere shader program I get some weird artifacts  
when the camera zoom in or rotates :   http://alex.tek.free.fr/these/exactSphere_weird.jpg

I say weird because the example programs of the vtkCSCS package are  
working well.

Do you have any clue of what could happen ?

I'm on MacOS X 10.5.8. It is a Cocoa based application

Best regards,

Alex