I am suddenly not sure. Is it possible to read a colour at a defined 
point - using trace() - on the surface of an object, by using 
eval_pigment() at that point? I know how to do it with an image_map as 
intermediary but can it be done directly?

For instance, if object{A} has a texture{B} and trace() finds a position 
P=<x,y,z> on the surface of A, would the colour at P then be 
D=eval_pigment(A,P) ? That obviously does not work as A is not a 
pigment. However, I would like to do something like that but do not know 
how.

Thomas

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