GoKawiilOpen-source 'Laser Graffiti' turns any wall into a laser-pointer canvas
A developer released Laser Graffiti, a Show HN project that pairs a webcam and projector so anyone can draw on a wall using a handheld laser pointer. The software tracks the laser dot and projects effects like glowing neon trails, dripping ink, or spinning 3D shapes over the strokes in real time. The creator says the project was inspired by an older video of artists laser-tagging buildings with projectors.