Mike Williams wrote:
> 
> It is, however, quite easy in POV to perform non-linear transformations
> on isosurfaces. The original poster wants to perform the non-linear
> transformation on a sphere, so there's no problem creating an isosurface
> to apply the non-linear transformation to.
> 
> 
> #declare  Sphere = function {x*x + y*y + z*z - 1}
> 
> isosurface {
>   function { Sphere(x,y*(2.5-y*0.8),z) }
>   max_gradient 4
>   contained_by{sphere{0,1}}
>   pigment {rgb 1}
> }
> 
> Adjust the "2.5" to change the overall vertical scale.
> Adjust the "0.8" to change how much the top differs from the bottom.
> 

Although it will be quite a bit faster if you use the internal function 
f_sphere().  Using a minimum size box container could also be more 
efficient.

:-)

Christoph

-- 
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http://www.tu-bs.de/~y0013390/ (Last updated 24 Jul. 2005)
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