Timothy Cook wrote:
<snip>

> So how DO I turn a sphere into a cube with an isosurface?
> I was playing with the spherical heightfield idea, and
> decided to start with a cube.  Simple enough, no?  No!  T_T
<clip>


Here's the way I do it:

#declare sphere_radius = 1;
#declare sphere_influence = .5;
#declare box_size = 1;
#declare box_influence = .5;

function{
  (
   sqrt(x*x+y*y+z*z)-sphere_radius
  )*sphere_influence
  +(
   max(
    abs(x)
    ,abs(y)
    ,abs(z)
   )-box_size
  )*box_influence
}

-Sam

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