-
Lighting effect, Revealing objects with light.
I need some assistance on mimicking a lighting effect. My project overview: as a door opens light spills forth, and as the light spills forth the face of the door is revealed. I attached a JPG reference so you can see what I am trying to accomplish:

Currently I have a black box on top of the door, and as the door swings open the black box fades out to reveal the color of the door. It looks OK for the few seconds that the motion occurs, however I wonder if there is a better way to mimic this lighting effect. Again, trying to emulate having the face of the door revealed by the light spilling forth from the doorway.
Note: I am working with Motion 2.1.2
Thank you