envmapSH - An Efficient Representation for Irradiance...

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An Efficient Representation for An Efficient Representation for Irradiance Environment Maps Irradiance Environment Maps Ravi Ramamoorthi Pat Hanrahan Stanford University
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Natural Illumination Natural Illumination People perceive materials more easily under natural illumination than simplified illumination. Images courtesy Ron Dror and Ted Adelson
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Natural Illumination Natural Illumination Classically, rendering with natural illumination is very expensive compared to using simplified illumination Directional Source Natural Illumination
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Reflection Maps Reflection Maps Blinn and Newell, 1976
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Environment Maps Environment Maps Miller and Hoffman, 1984
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Irradiance Environment Maps Irradiance Environment Maps Incident Radiance (Illumination Environment Map) Irradiance Environment Map R N
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Assumptions Assumptions Diffuse surfaces Distant illumination No shadowing, interreflection Hence, Irradiance is a function of surface normal
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Diffuse Reflection Diffuse Reflection B E ρ = Radiosity (image intensity) Reflectance (albedo/texture) Irradiance (incoming light) × = quake light map
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Previous Work Previous Work Precomputed (prefiltered) Irradiance maps [Miller and Hoffman 84, Greene 86, Cabral et al 87] Irradiance volumes [Greger et al 98] Global illumination [Wilkie et al 00] Empirical: Irradiance varies slowly with surface normal Low resolution Irradiance maps Irradiance gradients [Ward 92]
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New Theoretical Results New Theoretical Results Analytic Irradiance Formula [Ramamoorthi Hanrahan 01, Basri Jacobs 01]
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This note was uploaded on 08/22/2010 for the course CAP 6701 taught by Professor Staff during the Spring '10 term at University of Central Florida.

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envmapSH - An Efficient Representation for Irradiance...

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