> BTW, I implemented simple "rough" reflections earlier today.  That
> algorithm was trivial:
>
>  d = original_reflection_direction
>  s = surface_smoothness
>  if (s > 0) {
>    pt = random_vector();
>    d += s * pt;
>    normalize(d);
>  }
>  cast_new_ray(d);
>
> I haven't checked that it's mathematically accurate (it's possible
> that the distribution of the pertubed ray around the original
> direction isn't uniform) but it looks nice enough.

p.s. I've uploaded a sample image to:

http://ray.bellis.googlepages.com/mc-balls-01.jpg

A lot of the noise on that image is from the JPG compression.  This is from 
1.75 hours of rendering on a MacBookPro (Core2Duo)

Ray

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