Roadmap 0.9, Interior lighting design add-on (IL)
IL.1 Lighting design engine: room, photometry, inter-reflection (radiosity)
Built in the lab: lib/lightdesign. Direct light from .ies/.ldt plus the light bounced off floor, walls and ceiling as diffuse patches. Checks: energy conserved to 1.8 %, and a Monte Carlo photon trace of a 6 x 4 m office agrees to 1.4 %. No furniture, columns, windows or daylight.
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