How clear can it be? Well maybe it wasn't enough. Your charcter is in the default scene Color the background chromokey green. Color the ground plane chromokey green. Render your AVI. Create a background scene if you want. LIke a room or something Render that as a still image. Import the still and the AVI into any video editing app. PUt the still in video track one and adjust the length of the still from one frame to the total length of the avi. import the AVI and load it into a video track about videotrack 1. Since it has a solid green background you can chromokey out the green to expose the background image clip underneath. AS your character walks its shadow will be visible through the chromokey. Thereby appearing as though the final output is actually a single render.