I was doing some tooling about with the latest lighting challenge from 3DRender
(http://forums.cgsociety.org/showthread.php?f=185&t=955407) which features a
movie theatre.  One of the maon aspects of lighting here will be that coming
from the screen.  I first started using radiosity with an image projected on the
screen, however it was becoming apparent that it may take some really high
quality settings to get good results.  I then though of using an array of area
lights created from the projector image. I had already done a lot of the
mathwork in my lightdome work, so I did some quick conversions to making a
planar version of it with some nice results.

In the attached image, the first part is radiosity with some low quality
settings.  The second is using the arealight array (16 area lights, 4x4 each).

-tgq

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