Bill Pragnell wrote:

> 
> If you're using an isosurface or other pigment function-based perturbation,
> you should be able to use the same pattern to provide texturing - limit
> your grime textures to the same regions of the colour map as are used for
> the erosion. 

Agreed.  Pretty much the standard approach.


>The other thing you could try is using the un-weathered base
> object to define an object pattern - only areas inside the object could
> then be textured, i.e. just the weathered sections. I don't know if these
> are practical for your purposes...

I have had some success with this approach also, basically I think I 
jittered the object pattern through several minor scale changes.  I used 
that approach on this chalice image.  In the test shot the green shows 
where the grime colour would fall.

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