Well, this has taken about a day to understand and create -- all for 9 seconds. Basically I needed to get across the idea of a detection zone in a room being a configurable item.
I created three walls in Apple motion, then added a camera and a light. Once I could see the spotlighted area I used a ring with a thick border to act as the control over the detection area.
Anyway the results are about 20 seconds into this video:
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