Thanks for the point in an easier direction, but what i am after is a 
very tight rough surface, the kind that you normally get with sand stone 
or granite.

Thanks
Martin.

Slime wrote:
>>Im am still a novice with povray, which means i dont understand a lot
>>about povray. How do i go about creating a rough surface (for example
>>the randomness/roughness of the surface of a rock).
> 
> 
> The question is, do you need something which is truly rough, or can you
> settle for something which only *looks* rough?
> 
> If you only need a small amount of roughness, you can make an otherwise
> smooth surface *appear* rough by adding a normal{} to it. This has the
> advantage of keeping the modelling simple while still making an object that
> looks detailed. It has the disadvantage that the object's shadow is still
> smooth, and the fake bumps don't really protrude from the object. But
> sometimes it's good enough, and it's definitely easier for a beginner.
> 
> If this will work for you, then you should look up "normal" in the
> documentation, or look for it in the tutorial in the documentation's
> contents.
> 
>  - Slime
>  [ http://www.slimeland.com/ ]
> 
>

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