Mitchell-ShadingInValvesSourceEngine

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Radiosity Normal Mapping‣ We created this technique to efficiently address thestrengths of both radiosity and normal mapping‣ In other engines, per-pixel lighting terms are oftenaccumulated one light at a time• Multiple lights handled by summing multiple light contributionswithin or between passes‣ We express the full lighting environment in our novelbasis in order to effectively perform diffuse bumpmapping with respect to an arbitrary number of lights‣ This is the key to shading in Valve’s Source engine
Basis for Radiosity Normal Mapping⎨⎧ 1 1 1− , ,⎩ 6 2 3⎫⎬⎭⎧⎨−⎩16, −12,13⎫⎬⎭⎧⎨⎩32,0 ,13⎫⎬⎭
Page 1: Shading in Valve’s Source EngineS
Page 5: Marketplace ContextSee full survey
Page 8: Radiosity lighting
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 and 26: ‣ Typically clampN·L to zero at
Page 27 and 28: Ambient Cube‣ Pre-compute irradia
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
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Mitchell-ShadingInValvesSourceEngine

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