From Jaap Frank in p.b.scene-files

part of it are noisy. I need to probably to
adjust some settings in the solver & poly code (if it can fix something
at all)

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Le 18/12/2010 19:54, Le_Forgeron nous fit lire :
> From Jaap Frank in p.b.scene-files
> 
> part of it are noisy. I need to probably to
> adjust some settings in the solver & poly code (if it can fix something
> at all)

A good symbolic expander:

http://xrjunque.nom.es/precis/polycalc.aspx

(does not provide fractions, alas!)

All I know is piercing holes in sphere like torus
(z^2 + (x^2+y^2-1)*h1*h2...)

with h[1..] the hole : ((x-c.x)^2+(y-c.y)^2 -r^2)
c: coordinate of center
r: hole radius

last picture is 16th order.

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>"Le_Forgeron"  schreef in bericht news:4d0d0378@news.povray.org... 
>
>From Jaap Frank in p.b.scene-files
>
>part of it are noisy. I need to probably to
>adjust some settings in the solver & poly code (if it can fix something
>at all)

Take a look at the thread in P.b.s-f. I've found a similar noice
with the poly 8 object. Maybe that gives a clou for the solution.

Obviously the poly 16 is not where I was looking for. It is similar 
with a power 12 derivation I made at that time. There are only 
positive values for x possible. In the picture you see a chopped
up version that is duplicated, rotated and translated in order to 
make a spiral out of it, so it looks like negative values are 
possible, but I know how the spiral was made.
Clearly the multiple squaring during the derivation introduced 
artifacts.

Jaap Frank

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