[vtkusers] get texture at any point on a cell

[Theodore Papatheodorou]

Hi,
I have a 3D surface and a BMP file used as texture. I know the texture
coordinates of each vertex on the surface and I therefore can retrieve
intensity information. I would like to be able to retrieve intensity
information for any point even if it is in the middle of a cell. Does
anyone know how to do this? There should be a function that does that.
Any ideas?

Theodoros Papatheodorou