This is incredibly clever. An unknown developer has come up with an easy way to do projection mapping, using any projector (as long as it’s got HDMI) and your smartphone or tablet. You do this by isolating different zones you’d like to project onto, and turning each of them into a separate channel:
Three channels not enough? Here he breaks it into nine:
Here’s a demo where he shows you how to set it up:
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The app is called Lazy Lighting. It runs $20 a year, or $130 for a lifetime subscription.