"Lars R." <rou### [at] gmxnet> wrote:
> Problem: The object looks noisy, even with "sturm" enabled. :-(
>
> How can I get a smooth rendering? Is it possible for "poly" objects to
> enforce some "precomputing" or the like?
>
> I rendered with
>
>   -ibutterfly.pov +d +v -p +w800 +h600 +sp8 +ep8 +a0.1 +am2 +r3
>

> to the noises. :-(

I converted it to an isosurface.  It takes 80% more time, but at least it's
smooth.
________________________________________________

isosurface
{ function
  {   pow (x, 6) + pow (y, 6) + pow (z, 6)
    - 3 * (pow (x, 4) + pow (y, 4) + pow (z, 4))
  }
  max_gradient 115
  contained_by { box { -2, 2 } }

  pigment { color rgbf<1,0.7,0.2,0.5> }
//  normal { granite 0.1 }
  finish { phong 0.6 }
  interior { ior 1.5 }
}
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