[Algorithms] stencil shadow questions

[Charles B. <cb...@cb...>]

Some advanced (?) stencil shadow questions :

1. Is it possible to not self-shadow?  It seems to me that
stencil shadows inherently apply to all, which makes this
difficult, but it would seem to eliminate lots of complications.

2. Is it possible to give stencil shadows varying intensity?
Eg. near light A, you cast a 30% darkening shadow, near light B,
60% ; it seems to me that the fast way to do stencil results in
a uniform darkening (due to one big poly drawn on top of
everything).

I think #2 is pretty critical to having multiple light-sources,
so that you can transition your shadows between them.  If you
don't have #2, then you can basically only have a single set of
shadowing lights (either all or one probably) all the time.

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Charles Bloom    cb...@cb...    http://www.cbloom.com