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Add point light thin transmission support

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Signed-off-by: Santi Paprika <santi.gonzalez.cs@gmail.com>
This commit is contained in:
Santi Paprika
2021-12-02 18:36:55 +01:00
parent 97c36a71a2
commit d1b19a51d5
1 changed files with 9 additions and 8 deletions
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Gems/Atom/Feature/Common/Assets/ShaderLib/Atom/Features/PBR/Lights/PointLight.azsli
+9 -8
View File
@@ -84,8 +84,9 @@ void ApplyPointLight(ViewSrg::PointLight light, Surface surface, inout LightingD
// shadow
float litRatio = 1.0;
// How much is back face shadowed, it's set to the reverse of litRatio to share the same default value with thickness, which should be 0 if no shadow map available
float backShadowRatio = 0.0;
// Transmission distance from current light inside object (default non-influential values)
// o_transmission_mode == NONE is not taken into account because GetBackLighting already ignores this case
float transmissionDistance = (o_transmission_mode == TransmissionMode::ThickObject) ? 0.0f : 9999.0f;
if (o_enableShadows)
{
const float3 lightDir = normalize(light.m_position - surface.position);
@@ -97,13 +98,13 @@ void ApplyPointLight(ViewSrg::PointLight light, Surface surface, inout LightingD
lightDir,
surface.vertexNormal);
// Use backShadowRatio to carry thickness from shadow map for thick mode
backShadowRatio = 1.0 - litRatio;
if (o_transmission_mode == TransmissionMode::ThickObject)
{
backShadowRatio = ProjectedShadow::GetThickness(
shadowIndex,
surface.position);
transmissionDistance = ProjectedShadow::GetThickness(shadowIndex, surface.position);
}
else if (o_transmission_mode == TransmissionMode::ThinObject)
{
transmissionDistance = ProjectedShadow::GetThickness(shadowIndex, surface.position - lightingData.shrinkFactor * surface.normal);
}
}
@@ -111,7 +112,7 @@ void ApplyPointLight(ViewSrg::PointLight light, Surface surface, inout LightingD
lightingData.diffuseLighting += GetDiffuseLighting(surface, lightingData, lightIntensity, normalize(posToLight)) * litRatio;
// Transmission contribution
lightingData.translucentBackLighting += GetBackLighting(surface, lightingData, lightIntensity, normalize(posToLight), backShadowRatio);
lightingData.translucentBackLighting += GetBackLighting(surface, lightingData, lightIntensity, normalize(posToLight), transmissionDistance);
// Adjust the light direcion for specular based on bulb size