> Is this a feature of the isosurface or f_noise3d() and is
> there any way to avoid this ?

This is a "feature" of f_noise3d. Regardless of which noise generator you
use, each one is internally based off of some sort of interpolation between
points on a grid, and this becomes much more apparent when it is used as a
physical surface - especially with reflection or specular highlights.

Your best bet is to somehow modify the pattern so that this isn't a problem.
I had a little luck with adding turbulence to the noise function:

 #declare noisefunc = function { pigment {
  bozo
  color_map {[0 rgb 0][1 rgb 1]}
  warp {
   turbulence 3
   octaves 2
   lambda 4
   omega .2
  }
  scale 4
 } }
 function{y-noisefunc(x,0,z).red}

But of course this looks different and even the turbulence is based off of
the same function as f_noise3d is, so it doesn't completely solve the
problem. Fiddle with the turbulence parameters.

If you can't find another pattern that works well, you can always make your
own in a 2D image editor like Photoshop.

 - Slime
 [ http://www.slimeland.com/ ]

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