lecture10 - CS 551/651 Advanced Computer Graphics Radiosity...

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David Luebke 1 CS 551/651: Advanced Computer Graphics Radiosity Continued
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David Luebke 2 Recap: Assignment 1 Check out web page Go over exam
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David Luebke 3 Recap: Radiosity Fundamentals Definition: The radiosity of a surface is the rate at which energy leaves the surface Radiosity = rate at which the surface emits energy + rate at which the surface reflects energy Simplifying assumptions Environment is closed All surfaces have Lambertian reflectance Surface patches emit and reflect light uniformly over their entire surface
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David Luebke 4 Recap: Radiosity Matrix 1 - ρ 1 F 11 - 1 F 12 - 1 F 1n B 1 E 1 - 2 F 21 1 - 2 F 22 - 2 F 2n B 2 E 2 . . . . . . . . . . . . . . . - p n F n1 - n F n2 … 1 - n F nn B n E n Note: E i values zero except at emitters Note: F ii is zero for convex or planar patches Note: sum of form factors in any row = 1
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David Luebke 5 Evaluating Form Factors: Analytic: difficult, almost impossible Sampling: Hemicube/Ray-casting Ultimately still can get aliasing Sample from patch center/sample from vertices Ultimately still visibility, an approximation to the real form factor
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This note was uploaded on 12/09/2011 for the course CS 561/661 taught by Professor Lubke during the Summer '11 term at Virginia Tech.

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lecture10 - CS 551/651 Advanced Computer Graphics Radiosity...

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