Warp wrote:

>   However, there's one big problem here: As far as I can see, the normal
> calculation function has no access to the incoming ray.
>   Any ideas?

Two...: 
 -(bad) Put the incoming ray in a global... not on the head, not on the head

 - Add a ray parameter to all the involved functions going from the function
   where it is needed upto the function it is already available.
   But you might end up with having to update all the objects (at least,
   the prototype of the functions). And stack size is not infinite...
    (ok, it can be just a pointer to the ray structure, that's not that big).


-- 
Non Sine Numine
http://grimbert.cjb.net/

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