浏览代码

Added comment

/main
Sebastien Lagarde 7 年前
当前提交
fe80ebe2
共有 1 个文件被更改,包括 15 次插入3 次删除
  1. 18
      ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/Lit.hlsl

18
ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/Lit.hlsl


// term and there is no "neutral" value in this unlike in the original paper.
// We use Iridescence mask here to allow to have neutral value
// Hack: In order to use only one parameter (DInc), we deduced the ior of iridescence from current Dinc thicknessIridescence
// and we use mask instead to fade out the effect
float eta_2 = lerp(2.0, 1.0, bsdfData.thicknessIridescence);
// Following line from original code is not needed for us, it create a discontinuity
float eta2 = lerp(2.0, 1.1, bsdfData.thicknessIridescence);
float eta_2 = lerp(eta_1, eta2, smoothstep(0.0, 0.03, Dinc));
// float eta_2 = lerp(eta_1, eta_2, smoothstep(0.0, 0.03, Dinc));
// Evaluate the cosTheta on the base layer (Snell law)
float cosTheta2 = sqrt(1.0 - Sq(eta_1 / eta_2) * (1.0 - Sq(cosTheta1)));

float NdotV = ClampNdotV(preLightData.NdotV);
float3 F = F_Schlick(bsdfData.fresnel0, LdotH);
float DV;
// Note: Here we are suppose to call EvalIridescence with LdotH
// This is to expensive for our need, so instead we use the NdotV
// Moreover, the bsdfData.fresnel0 here already contain the evaluation of F_Schlick
// in the context of iridescence, so if iridescence is enabled, don't apply schlick a second time
if (HasFeatureFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_IRIDESCENCE))
{
F = lerp(F, bsdfData.fresnel0, bsdfData.iridescenceMask);
}
float DV;
if (HasFeatureFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_ANISOTROPY))
{
float3 H = (L + V) * invLenLV;

正在加载...
取消
保存