Rendering shadows - NOT the object itself
I've got a question regarding rendering in mental ray. I have an object standing on a plane, using a point light on it with raytrace shadows. Now when I render it, I just want the shadows the object casts on the plane to be rendered and not the plane itself.
I've tried to change the primary visibility of the plane in the attribute spread sheet but that doesn't get me the desired effect.
Is it at all possible to do it the way I want to?
Thanks in advance