> Hey everybody,
>     I've been a povray hobbyist for almost a decade now (never getting too
> serious, so this question may seem basic).  Right now I'm trying to model the
> fusion experiment I'm working on.  It's going pretty well except I am running
> into a challenge.  The machine is basically a torus differenced with another
> torus. The machine has deposits on the interior walls which I am modeling with a
> tight bozo texture (looks pretty good).  But whereever there is a porthole, an
> especially dark burned out section appears on the machine.  I'm wondering if
> there is an easy way to overlay a texture just in the area around a port hole.
> There is a picture of what I'm talking about here
>
> http://commons.wikimedia.org/wiki/File:Mst_portholes.JPG
>
> Any ideas?  basically the grey to darker grey bozo-like pattern turns into more
> of a salt and pepper pattern with a nearly black (actually thin-filmy)
> background, but only near objects like portholes or limiter tiles.  I want to
> deploy this in a way that I can have a "make porthole" function and it would
> apply this texture automatically, since we have many many MANY portholes and
> doing it by hand for each one would be a real pain.
>
> Cheers,
> -Dave
>
>

It looks like that can benefit from a proximity pattern.

There is at least one proximity pattern macro and it's in the todo list 
of features for version 3.7: coded but not implemented yet unless i'm 
mistaking.


Alain

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