When I feed the billboard an image with transparent pixels, it is performing some kind of anti-aliasing which causes "white fuzz" to appear where transparent pixels neighbor opaque pixels.I'm not sure exactly what is responsible for the anti-aliasing, or exactly what mechanism is being used to perform the anti-aliasing, so I'm not sure how to turn it off.
That's called "Bilinear filtering" -- its the way the texture is sampled. Not multisampling/antialiasing (though similar).
Check out /Developer/Examples/Quartz Composer/Compositions/Core Image Filters/Nearest Neighbor Sampling.qtz -- that demonstrates how to disable bilinear filtering inside the composition. This should be what you're looking for.
-- [ christopher wright ] [EMAIL PROTECTED] http://kineme.net/
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