[vtkusers] Texture and Clamp

[Matteo]

Hi
I have some problems with textures.
Looking to this address ( https://open.gl/textures ), especially looking 
at the first 4 images,  I found that it is possible to 'cut' the texture 
exactly at the end of the (S/T) range (0-1). I am referring to the 
graphic result obtained with "GL_CLAMP_TO_BORDER", that it is probably 
exactly what I need.

The problem is that I always get a result like "GL_CLAMP_TO_EDGE"

Of course I use RepeatOff(), but then trying 
EdgeClampOff()/EdgeClampOn() I can not see any change.
Is it a problem related to my graphic card (GEFORCE 310M) or it is 
normal to have this behaviour?

Thanks
Matteo
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