>   When POV-Ray renders the image it has tons of additional information
> about it besides simply the pixels. It has depth information, normal
> information, all kinds of other things. In order to post-process the
> image using this information you need to either save it all in files
> and then write a program which reads them and does the post-processing,
> or you can write a simple script in the future SDL to do the same thing.

How, in this model, do you adjust a parameter like focal point (in
the case of a blur process) and get a new image within seconds ?

>   Something like cell-shading or edge finding will probably take a few
> lines of SDL code, while with the gimp or photoshop it's *impossible*
> to do (at least with the same accuracy).

That's mostly how commercial (I mean : production-ready) 3D does...

Fabien.

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