From 76d71b4b5a0925454b5c86dc3904d7d5e3d17bec Mon Sep 17 00:00:00 2001
From: Alexander Gauggel <agauggel@uni-koblenz.de>
Date: Thu, 24 Jun 2021 01:52:01 +0200
Subject: [PATCH] [#82] Light bleeding reduction
---
.../resources/shaders/shadowMapping.inc | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/projects/voxelization/resources/shaders/shadowMapping.inc b/projects/voxelization/resources/shaders/shadowMapping.inc
index c97e0b81..8f14d35d 100644
--- a/projects/voxelization/resources/shaders/shadowMapping.inc
+++ b/projects/voxelization/resources/shaders/shadowMapping.inc
@@ -35,7 +35,7 @@ float ComputeMSMShadowIntensity(vec4 _4Moments, float FragmentDepth, float Depth
vec4(0.0));
float Quotient=(Switch[0]*z[2]-b[0]*(Switch[0]+z[2])+b[1])
/((z[2]-Switch[1])*(z[0]-z[1]));
- return clamp(Switch[2]+Switch[3]*Quotient, 0, 1);
+ return 1-clamp(Switch[2]+Switch[3]*Quotient, 0, 1);
}
vec4 quantizeMoments(vec4 moments){
@@ -59,6 +59,16 @@ vec4 unquantizeMoments(vec4 moments){
return T * moments;
}
+float rescaleRange(float a, float b, float v)
+{
+ return clamp((v - a) / (b - a), 0, 1);
+}
+
+float reduceLightBleeding(float shadow, float amount)
+{
+ return rescaleRange(amount, 1.0f, shadow);
+}
+
float shadowTest(vec3 worldPos, LightInfo lightInfo, texture2D shadowMap, sampler shadowMapSampler, vec2 offset){
vec4 lightPos = lightInfo.lightMatrix * vec4(worldPos, 1);
lightPos /= lightPos.w;
@@ -78,7 +88,8 @@ float shadowTest(vec3 worldPos, LightInfo lightInfo, texture2D shadowMap, sample
float depthBias = 0.f;
float momentBias = 0.00005;
- return 1-ComputeMSMShadowIntensity(shadowMapSample, lightPos.z, depthBias, momentBias);
+ float shadow = ComputeMSMShadowIntensity(shadowMapSample, lightPos.z, depthBias, momentBias);
+ return reduceLightBleeding(shadow, 0.1f);
}
#endif // #ifndef SHADOW_MAPPING_INC
\ No newline at end of file
--
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