William F Pokorny <ano### [at] anonymousorg> wrote:
> <---------------------- References. Thirteen previous posts
>
> Function / pattern issues. New inbuilt f_bump().
>
http://news.povray.org/povray.beta-test.binaries/thread/%3C5ee4dc4b%241%40news.povray.org%3E/
>
> and
>
> Function / pattern issues. New inbuilt f_elliptical_sphrswp().
>
http://news.povray.org/povray.beta-test.binaries/thread/%3C5ee529b9%241%40news.povray.org%3E/
>
> I posted code to povray.text.scene-files for a parametric supertoroid
> which will run in POV-Ray proper:
>
>
http://news.povray.org/povray.text.scene-files/thread/%3C5ec01b20%241%40news.povray.org%3E/
>
> Herein documenting better povr code for it which runs about four times
> faster.
>
> The new povr code looks like:
>
> ...
> #declare Vrx  = 0.1;
> #declare Vry  = 0.1;
> #declare Vrz  = 0.1;
> #declare VrAx = 0.9/Vrx;  // Major radius in x dived by Vrx.
> #declare VrBy = 0.2/Vry;  // Major radius in y dived by Vry.
> #declare VrE1 = 1.0;  // Flat / Sharp
> #declare VrE2 = 1.0;  // Square or Diamond path
> #declare VrMajorR = max(Vrx+VrAx,Vry+VrBy,Vrz);
>
> #declare FnX = function (u,v)
> {
>      Vrx * (VrAx + f_signpow(cos(u),VrE1,VrE1)) *
>                    f_signpow(cos(v),VrE2,VrE2)
> }
> #declare FnY = function (u,v)
> {
>      Vry * (VrBy + f_signpow(cos(u),VrE1,VrE1)) *
>                    f_signpow(sin(v),VrE2,VrE2)
> }
> #declare FnZ = function (u,v) { Vrz * f_signpow(sin(u),VrE1,VrE1) }
>
> #declare Para99 = parametric {
>      function { FnX(u,v) }
>      function { FnY(u,v) }
>      function { FnZ(u,v) }
>      <-pi,-pi>, <pi,pi>
>      contained_by { box { <-VrMajorR*2.2,-VrMajorR*2.2,-VrMajorR*2.2>,
>              <VrMajorR*2.2,VrMajorR*2.2,VrMajorR*2.2> } } // Sloppy
>      accuracy 0.0005
>      max_gradient 0.001
>      precompute 18, x,y,z
>      pigment { color Green }
> }
> ...
>
> here the bounding still general. The elapsed times for each of the
> attached images was in the 2-3 second range with AA on my two core i3.
>
> It's a flexible shape.
>
> Bill P.

Is there a way to play with this povr branch? I could'nt find it on github or
online....

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