On Mon, 26 Aug 2002 22:58:14 +0200, Jaime Vives Piqueres
<jai### [at] ignoranciaorg> wrote:
> function{f_sphere(x,y,z,1)+f_granite(x*10,y*.01,z*10)*.005}

Have you experimented with HF_Sphere macro from shapes.inc ?
You can modify it to drop all triangles where all three vertices are outside
section you choosed. Creation with necessary accuracy can take some time but
created once it can be quickly reused in every next render.

ABX

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