I'm doing my first little project with live video + motion tracking. Now I’m having a problem with the shadows. I used the search & Google but nothing really worked.

For the proof of concept i made a cylinder on a plane. Then made the plane shade "use background". Then render. But when I open the tiff in Photoshop (or AE etc.) I get a white reflection and a shadow that is not transparent (not working.jpg).

What I am after is the wantthis.jpg

Does somebody have a few simple tips how to do this right. Or an *.ma with a cylinder and plane with the right settings so that I can figure it out for myself.

grt,
Rene
the Netherlands