Matte Shadow

Matte Shadow let’s you render Ambient Occlusion and Shadows onto an invisible plane so that you can render them on a background image. See Using Matte Shadow Plane for more info on how to setup.

Matte Shadow Render Settings

Shadow Opacity/Shadow Tint/Affect Lighting

Use the Shadow Opacity, Shadow Tint, and Affect Lighting to dial in the look of how the shadow overlays onto the background.