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bsdfData.ior = ior; |
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// IOR define the fresnel0 value, so update it also for consistency (and even if not physical we still need to take into account any metal mask) |
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bsdfData.fresnel0 = lerp(ConvertIORToFresnel0(ior).xxx, baseColor, metallic); |
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bsdfData.fresnel0 = lerp(IORToFresnel0(ior).xxx, baseColor, metallic); |
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// Absorption coefficient from Disney: http://blog.selfshadow.com/publications/s2015-shading-course/burley/s2015_pbs_disney_bsdf_notes.pdf |
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bsdfData.absorptionCoefficient = -log(transmittanceColor + 0.00001) / max(atDistance, 0.000001); |
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bsdfData.absorptionCoefficient = TransmittanceColorAtDistanceToAbsorption (transmittanceColor, atDistance); |
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bsdfData.transmittanceMask = transmittanceMask; |
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bsdfData.thickness = max(thickness, 0.0001); |
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} |
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// Refraction |
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float3 transmissionRefractV; // refracted view vector after exiting the shape |
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float3 transmissionPositionWS; // start of the refracted ray after exiting the shape |
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float transmissionOpticalDepth; // length of the transmission during refraction through the shape |
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float3 transmissionTransmittance; // transmittance due to absorption |
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float transmissionSSMipLevel; // mip level of the screen space gaussian pyramid for rough refraction |
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}; |
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// This is a refract - TODO: do we call original refract or this one, original maybe slightly emore expensive, to check |
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// This is a refract - TODO: do we call original refract or this one, original maybe slightly more expensive, to check |
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float3 ClearCoatTransform(float3 X, float3 N, float ieta) |
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{ |
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float XdotN = saturate(dot(N, X)); |
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RefractionModelResult refraction = REFRACTION_MODEL(V, posInput, bsdfData); |
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preLightData.transmissionRefractV = refraction.rayWS; |
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preLightData.transmissionPositionWS = refraction.positionWS; |
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preLightData.transmissionOpticalDepth = refraction.opticalDepth; |
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preLightData.transmissionTransmittance = exp(-bsdfData.absorptionCoefficient * refraction.opticalDepth); |
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preLightData.transmissionSSMipLevel = PerceptualRoughnessToMipmapLevel(bsdfData.perceptualRoughness, uint(_GaussianPyramidColorMipSize.z)); |
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preLightData.transmissionTransmittance = exp(-bsdfData.absorptionCoefficient * refraction.distance); |
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// Empirical remap to try to match a bit the refractio probe blurring for the fallback |
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preLightData.transmissionSSMipLevel = sqrt(bsdfData.perceptualRoughness) * uint(_GaussianPyramidColorMipSize.z); |
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preLightData.transmissionOpticalDepth = 0; |
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preLightData.transmissionTransmittance = float3(1.0, 1.0, 1.0); |
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preLightData.transmissionSSMipLevel = 0; |
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#endif |
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GitHub
7 年前