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Use generic diffusion profiles instead of skin-specific

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Signed-off-by: Santi Paprika <santi.gonzalez.cs@gmail.com>
This commit is contained in:
Santi Paprika
2021-12-06 12:38:30 +01:00
parent 6172bb0034
commit 7e78c260c1
1 changed files with 7 additions and 2 deletions
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Gems/Atom/Feature/Common/Assets/ShaderLib/Atom/Features/PBR/BackLighting.azsli
+7 -2
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@@ -23,6 +23,7 @@ float3 TransmissionKernel(float t, float3 s)
return 0.25 * (1.0 / exp(exponent) + 3.0 / exp(exponent / 3.0));
}
// [specific profile for SKIN (not used ATM)]
// Analytical integation (approximation) of diffusion profile over radius, could be precomputed in a LUT
float3 T(float s)
{
@@ -68,11 +69,15 @@ float3 GetBackLighting(Surface surface, LightingData lightingData, float3 lightI
float E = max(lightingData.angleOffset + dot(-surface.normal, dirToLight),0.0);
// Transmission distance computed from shadowmaps modulated by editor-exposed parameters
float s = transmissionDistance * surface.transmission.thickness * (100 - transmissionParams.w) * 10;
float s = transmissionDistance * surface.transmission.thickness * (100 - transmissionParams.w);
// Use scattering color to weight thin object transmission color
const float3 invScattering = rcp(transmissionParams.xyz);
// Albedo at front (surface point) is used to approximate irradiance at the back of the object
// See observation 4 in [Jimenez J. et al, 2010]
result = T(s) * lightIntensity * surface.albedo * E;
result = TransmissionKernel(s, invScattering) * lightIntensity * surface.albedo * E;
// result = T(s) * lightIntensity * surface.albedo * E;
}
break;
}