3ds Max :: Trying To Get Gradient Shadow

I need to isolate the objects casting the shadow and the shadow itself. I can't seem to get things to work. And Rendering out with even the object underneath it as a solid white is proving more difficult then I imagined to get the gradient shadows.

How do I do this. Again, I am fairly certain it's a render elements thing, but 'Shadow' isn't producing it.The scene is using Mental Ray, A&D materials, a skylight (no other lighting).I've included an image. I need the objects shown, the subtle shadow, but NOT the solid white chunk behind it.