>"Le_Forgeron"  schreef in bericht news:4d0ef88b@news.povray.org... 
>That does not give me a clue about the issue in the solver, maybe
>someone with more insight on the subject could help.

If thougt about it and got the following reasoning:
As I remember, the ray direction is subsituted in the equation.
We get noise if the distance gets bigger, so bigger values make 
the solver get astray.
The distance vector can be normalised without changing its 
meaning, so will it help to normalize the direction vector first
or is that already done. 
I can't remember if the position vector is substituted as well, 
but normalizing that vector will change his meaning and I
can't think of a reason to substitute that. But who am I :-)

Is it possible that you sent me the newest poly.c and possible
your binary of Pov, so I can study the solver again and  can 
experiment with the poly16. I'm recently retired from work and
have plenty of time now to crunch main brain about it ;-)

Do you have a clue for me about the mathematics of the solver?
I will search the internet as well, for thirteen years ago or now 
makes a very big difference.

Jaap

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