Sylvain Dubé nous apporta ses lumieres en ce 2008/03/14 14:52:
> Is MegaPOV have any function for this?
> 
> Sylvain
> 
> 
> 
Not that know of.

You should use user functions and macros to do the task.

Don't forget that when you enter an object, your next trace will be toward that 
same object to find the exit point. This can lead to multiple total internal 
reflections.

Once you exit an object, there are cases where that object can be a valid 
target. Any object with any concavity or opening can interact more than twice.

Any concave reflective object can reflect a ray more than once.

All this mean that you may need a recursive function.

-- 
Alain
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   I'm so ugly I stuck my head out the window and got arrested for Mooning.
   	Rodney Dangerfield

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