To Prevent an Object from Receiving Light

1. In the scene, select the object or objects to exclude.
2. Open the Light Include/Exclude dialog.
3. In the Geometry group, choose Exclude.
4. Click the Assign To Light button.
5. In the scene, click a light. If the light is hard to locate, use the Pick Object dialog (keyboard shortcut H) to pick the light.

   The object is now excluded from being illuminated by the specified light. The Objects list at the bottom of the dialog lists the object.

6. Render to see the effect.