[vtkusers] gray value of image

[Sergi Dote]

Hello vtkUsers, I need your knowledge:

I work with a volume (gray CT) and I want to get the gray value of a point
of this volume specified by world coordinates; this is, for example I ask
what is gray value of a point Xmin=33.2 Xmax =123.2 Ymin=14.1
Ymax=15.6Zmin=11 Zmax=11 and I need to have this value.

Somebody knows how can I do this?

thank you very much!!

-- 
.: Sergi Dote Teixidor :.
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