Mitchell-ShadingInValvesSourceEngine

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Ambient Cube Basis‣ Six RGB lobes stored in shader constants‣ More concise basis than first two orders of sphericalharmonics (nine RGB colors)‣ Pixel shader constant store is currently a bottleneck,though this eases quite a bit on ps_3_0‣ Developed in parallel with other techniques such as[Ramamoorthi01]+y-x-z +z+x-yfloat3 AmbientLight( const float3 worldNormal ){float3 nSquared = worldNormal * worldNormal;int3 isNegative = ( worldNormal < 0.0 );float3 linearColor;linearColor = nSquared.x * cAmbientCube[isNegative.x] +nSquared.y * cAmbientCube[isNegative.y+2] +nSquared.z * cAmbientCube[isNegative.z+4];return linearColor;}
Comparison of Ambient Cube to Spherical HarmonicsOriginal Light ProbesIrradiance EnvironmentMaps from[Ramamoorthi01]Valve AmbientCubes
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 and 26: ‣ Typically clampN·L to zero at
Page 27: Ambient Cube‣ Pre-compute irradia
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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