CompuServe Messages

Hi Mike, ->"I am trying to create an effect…that simulates a rear projection screen…that will show the shadows cast upon it from back lighting the rear…I am unable to get any shadows cast from meshes behind it." I don't think there's any way to create a material that allows shadows cast on one side of a 2-sided object to show up on the other. However, maybe a different approach would be to first render just the behind- the-screen meshes with alpha-split turned on. Then take just the alpha-split images and use them as an animated opacity map on a flat black polygon that sits just in front of your projection screen. These animated black cutouts might simulate the effect you're describing. I just had a wild thought. Would projecting the alpha channel through a rectangular-aspect projector light with a *negative* multiplier actually subtract other light present on the projection screen? Hmmm, it's getting late, maybe I'm not thinking quite clearly. I'll have to try this out tomorrow. Cheers, -Heinz.