[VaSteve]

Originally Posted by stomachmonkey

Sorry.

An Alpha Channel is a mask.

lolz. I googled it after you posted. I couldn't resist the opening to have some fun.

Originally Posted by varmint

alpha channel is part of it. they use motion tracking in after effects. pick out a couple markers in the real world. the computer identifies them, and lays an image down relative to their position. it even adjusts for perspective.

at least i think that's what you're talking about.

Yes, must be. I forgot about those "trackers" for the cars. That stuff is top notch and well used.

thanks guys