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

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