2023.03.19

• dreamwork engine 开源
• Dual Lobe Specular
• ddx ddy
• C++ final

dreamwork engine 开源

https://github.com/dreamworksanimation/openmoonray

Dual Lobe Specular

• dual lobe BeckMann

  half specularTermBeckMann = (2.0 * (brdfData.roughness2) / ((d * d) * max(0.1h, LoH2) * brdfData.normalizationTerm)) * _LobeWeight * mask;
  half specularTerm = (specularTermGGX / 2 + specularTermBeckMann) * SpecularOcclusion ;

• skin dual lobe specular

  float roughnessL = PerceptualSmoothnessToRoughness(saturate(lobeA - bsdfData.perceptualRoughness * lobeA));
  float roughnessH = PerceptualSmoothnessToRoughness(saturate(lobeB - bsdfData.perceptualRoughness * lobeB));
  
  DV = lerp(DV_SmithJointGGX(NdotH, abs(NdotL), clampedNdotV, roughnessL, preLightData.partLambdaV),
       DV_SmithJointGGX(NdotH, abs(NdotL), clampedNdotV, roughnessH, preLightData.partLambdaV),
       lobeMix);

ddx ddy

底层实现本质，只支持pixel input的梯度

C++ final