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Radiosity Lighting Studio

Interactive 2D radiosity simulator for architectural lighting design: place a daylight window on a room wall, tune surface reflectance and room proportions, and watch a real energy-exchange radiosity solve light the walls and floor, with live illuminance and uniformity readouts.

Geology & Earth Science2DModerate60 FPS📱 Mobile-adapted🌍 Earth

This simulator explores architectural lighting design through a real 2D radiosity model. A rectangular room is discretized into wall patches; a window on one wall emits daylight, and every patch exchanges light with every other patch according to the classic radiosity energy-balance equation, solved iteratively until it converges. Adjusting the window's position, the daylight intensity, the surface reflectance, or the room's proportions changes how light bounces around the space — visualised directly on the walls and as a floor illuminance heat map, alongside live average, maximum, minimum and uniformity readouts, the same metric architectural lighting designers use to judge whether a room is evenly lit.

⚙ Under the hood

This simulation allows you to explore the principles of architectural lighting design using a 2D radiosity model. Experiment with different light sources, materials, and room geometries to observe how they affect the illumination distribution.

Lighting DesignRadiosity2D

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install