I'm trying to add some text with a light source casting shadows to an underlying video. I don't want the light source to alter the underlying video though. I don't find any kind of null or transparent layer that will still show a visible shadow off the text above.
I've tried playing the video in a 2nd composition, placing a solid color layer under the text in Comp1 and using keying or matte techniques to "bluescreen" out what I don't want. But nothing I try works correctly -- it always decays the actual shadow by like 50% at the same time.
Anyone have some insight into what I could do?

