🧪 Theater Costume Design Simulation

A costume swatch never looks the same twice under stage lighting — its true color is a spectral reflectance, and what the audience actually sees is that reflectance multiplied by whatever colored light lands on it. This simulator renders a 3D costume form under a realistic two-light stage rig — a gelled key spotlight plus a neutral ambient fill — so you can pick the fabric's true hue and lightness, choose a gel color from real theatrical presets (red, amber, blue, green, magenta) or dial the key light's intensity, and watch the perceived color, luminance and color-shift distance update live as the render's physically based lighting recomputes it, exactly the way a lighting designer's swatch test would.