[vtkusers] position interpollation

[Sebastien_MARAUX]

Hello,

I'm managing triangulated surfaces - DTM -
I would like to be able to obtain the height at any point (x,y).

1. How to quickly find the triangle concerned by point (x,y), 

2. and how to interpolate the 3 vertices of the triangle to find 
the height at point (x,y).

or 1+2 : how to find directly the height in vtkPolydata from 
a point (x,y) (x,z in my case because y and z are swapped)

I hope to be clear enough...

Sebastien MARAUX
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