Each year, I have a fairly elaborate Halloween display. This year I wanted to incorporate some video projection into the mayhem of smoke, sounds and leaping spiders of doom. Looking for ideas, I stumbled on this video from Tinkernut, where he details how to make interactive, projection video...Cheap.

He uses a free software program called VPT (VideoProjectionTool). With VPT and a webcam connected to your laptop and projector, you can can create layers that can then be mapped to detected objects coming into the mapped zone triggering the projection to go to the predefined event. In this case, Tinker nut made a skull look at someone as they entered the filed of view. Yeah, sounds complicated, but it really isn't.

I'm gonna have to try this.