"Margus Ramst" <mar### [at] peakeduee> writes:

> Roland Mas wrote in message ...
[...]
> >  Variable IOR means bent rays, which is kind of a huge piece of work
> >to do.  I agree on the use of these features, though.
> >
> 
> 
> I suppose this _could_ be simulated with volume sampling, like in
> media. But that's my uneducated guess.

Yes, sure.  But it would anyway imply a huge lot of calculations,
because the ray is bent all along its path and not just on a few
points of it.  Which means: a *big* number of samples.  Each of them
needing to calculate a ior local gradient.  Sloooow.

Would be nice, though :-)  For all of us who had to model the path of
a laser in a fiber, by writing a C program...
-- 
Roland Mas

Autumn leaves are brown...  And the sky is gray...
  -- California Dreaming (The Mamas and the Papas)

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