Tom Melly wrote:
> [...]
> 
> #declare FSphere=function (x,y,z,R) {pow(x*x+y*y+z*z,0.5) - R}
> isosurface
> {
>   function{FSphere(x,y,z,2)}
>   threshold 0
>   contained_by {box {-5,5}}
>   max_gradient 13
>   texture{
>     pigment{color rgb .6}
>   }
> }

Actually you should use sqrt() instead of pow(,0.5).

And since the radius R is a render time constant it is not necessary for 
it to be a parameter:

#declare R=2;

#declare FSphere=function {sqrt(x*x+y*y+z*z) - R}

isosurface
{
   function{FSphere(x,y,z)}
   ...
}

And this is exctly how it is shown in the isosurface tutorial in the 
documentation.

Christoph

-- 
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HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 25 Oct. 2003 _____./\/^>_*_<^\/\.______

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