Increased path tracing roughness range.

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -794,6 +794,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - DXR: Dispatch binned rays in 1D instead of 2D.
 - Lit and LayeredLit tessellation cross lod fade don't used dithering anymore between LOD but fade the tessellation height instead. Allow a smoother transition
 - Changed the way planar reflections are filtered in order to be a bit more "physically based".
+- Increased path tracing BSDFs roughness range from [0.001, 0.999] to [0.00001, 0.99999].
 
 ## [7.1.1] - 2019-09-05
 

com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/PathTracing/Shaders/PathTracingBSDF.hlsl

@@ -4,8 +4,8 @@
 #include "Packages/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/Raytracing/Shaders/SubSurface.hlsl"
 
 #define DELTA_PDF 1000000.0
-#define MIN_GGX_ROUGHNESS 0.001
-#define MAX_GGX_ROUGHNESS 0.999
+#define MIN_GGX_ROUGHNESS 0.00001
+#define MAX_GGX_ROUGHNESS 0.99999
 
 // Adapted from: "Sampling the GGX Distribution of Visible Normals", by E. Heitz
 // http://jcgt.org/published/0007/04/01/paper.pdf

com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/PathTracing/Shaders/PathTracingMain.raytrace

@@ -108,7 +108,7 @@ void RayGen()
     pathIntersection.value = 1.0;
     pathIntersection.remainingDepth = _RaytracingMaxRecursion;
     pathIntersection.pixelCoord = currentPixelCoord;
-    pathIntersection.maxRoughness = 0.001;
+    pathIntersection.maxRoughness = 0.0;
 
     // In order to achieve filtering for the textures, we need to compute the spread angle of the pixel
     pathIntersection.cone.spreadAngle = _RaytracingPixelSpreadAngle;