You are right a combination of texture_map (or even better and 
more accurate: material_map, like this you can place the erosion where 
you want) and layered texture do the job! A new pattern which can do
this 
automatically could be, in fact, difficult to use no?

Fabian.

Chris Huff wrote:
> 
> In article <38978732@news.povray.org>, "TonyB"
> <ben### [at] panamac-comnet> wrote:
> 
> > Not this again! I though we had already talked about this. I believe you
> > guys concluded that it couldn't be done. Right?
> 
> It can be done. All you have to do is use the right combination of
> texture maps and layered textures. You don't even need a patch.
> 
> Of course, a patch that gives a new pattern which varies depending on
> the curvature of the surface of an object would be very useful for this
> kind of thing. I have tried to do this, but without success, and I
> haven't done any work on it lately.(although I have a couple ideas that
> I would like to try out)
> 
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/

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