[vtkusers] Adding texture coords manually to a polydata. Please Help

[Godofredo]

Hi to all.
I'm working with a triangulated point cloud and would like to add textures
to it from various images. 
I would like to know if it is possible to set texture coords directly to
each triangle, assigning each triangle a portion of an image or a set of
pixels. Just like a vrml file does, for example. 
Maybe the right question is how does vtk actually save texture info when you
use vtktexturemaptoplane and add the texture to a mapper. 
Could anyone give me any orientation on how to do this, or if this can be
done? Hope I've explained myself. Thanks in advance. 
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