> The parametric equations for the Dini surface are:
> 
> #declare fx=function(x,y) { a*cos(u)*sin(v) };
> #declare fy=function(x,y) { a*(cos(v)+ln(tan((v/2))))+b*u };
> #declare fz=function(x,y) { a*sin(u)*sin(v) };
> 
> u varies between 0 and 4*pi, v varies between 0.0001 and pi/2.
> The parameter b was fixed at 0.2 and the animation was obtained by
> varying the parameter a from 0.1 to 1.1.
> I didn't use the "parametric" possibilities in Povray 5.5, because I
> found the rendering was to slow but furthermore the sharp peak in the
> images was cut off. I used the method explained by Tore Nordstand,
> http://www.uib.no/People/nfytn/mathgal.htm
> using smooth triangles, but adopted his program to use #declare fx =
> function.... etc.
> I also had to change other thing in his program.
> 

Thanks!
New stuff for some some playaround...

> As I'm not at all an advanced user of Povray I had to trie a lot about
> placing the camera and the lightsources!
> 
Always a question of how you like it best ;-)

Regards,
Sebastian H.

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