Lights

A sphere, a torus, a column, and a cube stand on a floor of just two triangles, lit by a gradient sky or a warm/cool panorama, with diffuse image-based lighting. Cycle presets to compare the default key light, a slowly turning sun under the sky, three colored lamps orbiting, a single lamp at night, and eight lights at once, the most a frame holds. Light is found per pixel, so a lamp's bright spot moves across the floor where no vertex is; each lamp's small sphere shows where it is. Press n to compare the generated relief normal map with the smooth surfaces.

Software lights every pixel as the GPU does, more slowly. Click the terminal to focus keyboard controls. GPU falls back to software when unavailable. Reload to restart after quitting.