Paint Anything Anywhere
Into a Projection Screen.

Flat, vertical screens only. Angles are measured from the screen center; eye height includes row risers. The normal-centered mode places peak gain on the screen normal. Angle-reflective mode mirrors the projector direction across the normal; retroreflective mode points back toward the projector. A smooth angular falloff is applied around the chosen lobe axis: gain = peak × 2^{−[(horizontal / H)² + (vertical / V)²]}. H and V are your assumed half-gain angles. Screen-edge gain is sampled at the corners, edge midpoints and center.

This is a planning model, not a measured product gain report. Projector-to-screen incidence and ideal reflection directions are geometric. Reflection-mode falloff is assumed; the model excludes measured ALR directionality, curved screens, obstructions, irradiance nonuniformity and real installation losses. Do not use it to predict UST/ALR performance. Changing screen size changes image angles and edge estimates; center gain depends on the seat angle and assumed curve.