in news:slr### [at] fwicom Ron Parker wrote:

> The solution I proposed the last time this discussion came around
> was to fire rays from just "above" the intersection point in a
> small area around the intersection point, and estimate the
> curvature from that. 

:) You could have shot your first ray through a hole and have the 
random rays now inspecting the inside of a big cavity.

Anyway, could something like this be done with functions and macro's?

Ingo

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