3D Compositing with Action > Action: Lights and Lighting Effects > Relighting: Casting Shadows >
Surface and Geometry Shadow Casters

By default, all objects in the scene cast and receive shadows from a light attached to a Shadow Cast object. You can control this on a per object basis in the Object Surface or Geometry menu.

The Shadow Casting box in the Surface or Geometry menu allows you to select how the each image or geometry object is affected by a Shadow Cast object in the scene.

Select: | For the Surface or Geometry to:
--- | ---
Cast & Receive | Cast and receive a shadow (this is the default).
Receiver | Receive, but not cast a shadow.
Caster | Cast, but not receive a shadow.
Shadow Only | Not be displayed, but the shadow is displayed.
Off | Not cast or receive a shadow.