Animation: light is shining through plane: how to stop that Using Blender 2.77a. I've made a lighthouse scene with a rotating spot lamp. When the lamp moves by the hill in the background, the lamp shines through the hill. The hill is a plane.
How can I stop the light from shining through the hill?
Thanks in advance.
Assuming you are using a spot with Halo enabled.

Change the Spot Shape > Step value to 1.

This will block the Halo.

See the image below.