Illumination from Curved Reflectors

Pat Hanrahan and Don Mitchell. Computer Graphics (Proc. SIGGRAPH 1992), July 1992


A technique is presented to compute the reflected illumination from curved mirror surfaces onto other surfaces. In accordance with Fermat's principle, this is equivalent to finding extremal paths from the light source to the visible surface via the mirrors. Once pathways of illumination are found, irradiance is computed from the Gaussian curvature of the geometrical wavefront. Techniques from optics, differential geometry and interval analysis are applied to solve these problems.

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