Desktop Radiance is an advanced lighting analysis and visualization tool that can be used to model simple or complex daylight and electric lighting systems. Radiance can handle virtually any space geometry, as well as non-diffuse reflectances. With this program, you can compute horizontal illuminance across an arbitrarily oriented grid of points, generate a rendered image of a space that can be queried for the illuminance or luminance of any surface in a rendered image of a room, and more.
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