Shading, ambient occlusion, and rendering with alpha

I’m having a problem with shading, ambient occlusion, and rendering with alpha.

I want to render an animation of a cube resting on the ground and then composite it on to a video. What I can’t figure out how to do is render just the cube, the ambient occlusion (but no shadow), and an alpha background.

Can anyone tell me how to do that?



I think you can do that this way:

1.Set your occlusion or aproximated ao, as you wish

  1. put a plane down the cube and that material´s cube must have full alpha and turn off the shadow button.

so I think the occlusion will make the contact shadows of the cube, but will not render the plane. Try it but i am not pretty sure.