Mitchell-ShadingInValvesSourceEngine

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Indirect Illumination in Games‣ Quake III used a filtered samplefrom a 3D array of ambient terms toprovide a constant ambient for agiven character [Hook99]‣ MotoGP used a hemisphere lightingmodel where bounced light from theground varied spatially throughoutthe race track [Hargreaves03]‣ Max Payne 2 stored linear 4-termspherical harmonic coefficients foruse in lighting characters and othermoving geometry [Lehtinen06]From [Hargreaves03]
Ambient Cube‣ Pre-compute irradiance samplesthroughout the environment‣ 4’×4’×8’ density‣ The set of samples is referred to inthe literature as an irradiancevolume [Greger98] and eachsample defines an irradianceenvironment map [Ramamoorthi01]Directional AmbientConstant Ambient‣ Directional ambient term which includes indirect light‣ Lights beyond the first two can be added to the ambient cube
Page 1: Shading in Valve’s Source EngineS
Page 5: Marketplace ContextSee full survey
Page 8: Radiosity lighting
Page 11 and 12: Basis for Radiosity Normal Mapping
Page 13 and 14: At the pixel level. . .‣ Sample t
Page 15 and 16: Variable Luxel DensityCoarser light
Page 18 and 19: Environment probesplaced in Level E
Page 20 and 21: Diffuse Lighting Only
Page 23 and 24: Other World Lighting‣ There are a
Page 25: ‣ Typically clampN·L to zero at
Page 29 and 30: Comparison of Ambient Cube to Spher
Page 31: Benefits of Half Lambert and Ambien
Page 36 and 37: ‣ Compute Phong termsfor up to tw
Page 40 and 41: High Dynamic RangeRendering in theS
Page 43 and 44: Scene from Lost Coast at Multiple E
Page 45 and 46: Authored Sources of HDR Illuminatio
Page 48: Tone Mapping‣ Very careful with l
Page 51 and 52: Another bucket from the running his
Page 53 and 54: Float vs. Integer HDR Tradeoffs‣
Page 55 and 56: Half Life 2: Episode 1
Page 57 and 58: Team Fortress 2: NPR + HDR!
Page 59 and 60: Team Fortress 2: NPR + HDR!
Page 61 and 62: Color Correction‣ Color has been
Page 63 and 64: DesaturationOriginal ImageDesaturat
Page 65 and 66: ‣ World Lighting• Radiosity Nor
Page 67 and 68: Acknowledgements‣ Many thanks to
Page 69: Questions?Valve is Hiring!jobs@valv

Mitchell-ShadingInValvesSourceEngine

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