Sounds like a neat idea, but you gotta make sure the glitter itself doesn’t create any light spikes. Stick to a very low‑intensity LED, wrap it in matte black fabric, and run the trigger on a simple photodiode line. Keep the wiring short, use shielded cables, and test it under the exact lighting you’ll use in game—no surprises. Then map out the shadow line on a napkin, double‑check every corner, and you’ll have a quiet, glitch‑free decoy.