"Robert McGregor" <rob### [at] mcgregorfineartcom> wrote:

> > There are also other uses of AO like to bake it and use as a basis for dirt
> > maps, mask to mix different materials and many textures to process further.
>
> That's something else I'm working on, using the AO pass as an image_pattern mask
> to control grime and such in crevices, for an additional dirt/grime pass.

That's exactly what I did in this one:

http://news.povray.org/povray.binaries.images/thread/%3C48bfcfab@news.povray.org%3E/

Works really well I found - just a simple projection with Rune's illusion.inc of
the AO image onto a new grime/dirt pass.

Cheers,
Edouard.

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