Storage medium, information processing apparatus and calculation method
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United States of America Patent
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Apr 18, 2017
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May 4, 2015
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Jul 7, 2014
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Abstract
An information processing apparatus obtains an incident radiance at a shading point by obtaining a light emission radiance of a target light source expressed by a spherical Gaussian (SG expressed), approximating by a spherical Gaussian (SG approximating) a function indicating a spread of the target light source from a perspective of the shading point, and obtaining the product of these. Also, the apparatus SG approximates a bidirectional reflection distribution function (BRDF) at a shading point, and calculates the radiance at the shading point based on information indicating the viewpoint for which the shading point is to be rendered, an incident radiance at the shading point, and the SG approximated BRDF at the shading point.
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