Any wall. Any desk. A touch surface.
An ultra-short-throw projector and a depth camera turn a bare surface into something you touch directly, with nothing mounted on the surface itself.
The projector sits close and steeply angled.
That is the whole reason ultra-short-throw optics exist here: your hand never casts a shadow across what you are touching. A conventional projector puts your arm directly in the beam.
Depth sensing, because colour cannot do this job.
A colour camera aimed at a projected surface is the hardest possible case. It sees the projected image, which wrecks hand detection, and it fundamentally cannot tell hovering from touching. Depth gives touch, hover, mid-air gestures and hand identity from one sensor, and tolerates a surface that is not perfectly flat.
Calibration decides whether it feels good or infuriating.
Not the sensor brand. A projector-to-camera mapping from projected calibration dots, a stored empty-surface depth reference, and a pre-warp so a heavily angled image reads as a clean rectangle. Above roughly 50 milliseconds end to end, typing and dragging feel broken.
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