Merge pull request #61 from Looooong/improve-cone-tracing-direction-selection

Improve cone tracing direction selection

Author: Looooong

CHANGELOG.md

@@ -11,6 +11,11 @@
 
 - Added indirect lighting modifier.
 
+### Changed
+
+- Improved cone tracing direction selection.
+- Removed cone tracing bias.
+
 ### Fixed
 
 - Fixed the gizmos being drawn in Game View.

ShaderLibrary/Radiances/Pixel.cginc

@@ -80,7 +80,7 @@
       float3 unit = Directions[i];
       float NdotL = dot(data.vecN, unit);
 
-      if (NdotL <= 0.0) continue;
+      if (NdotL < ConeDirectionThreshold) continue;
 
       float4 incoming = 0.0;
       float size = 1.0;
@@ -89,7 +89,7 @@
       for (
         float3 coordinate = apex + direction;
         incoming.a < 0.95 && TextureSDF(coordinate) > 0.0;
-        size *= 1.5, direction *= 1.5, coordinate = apex + direction
+        size *= 2.0, direction *= 2.0, coordinate = apex + direction
       ) {
         incoming += 0.5 * (1.0 - incoming.a) * SampleRadiance(coordinate, size);
       }
@@ -98,6 +98,6 @@
       cones++;
     }
 
-    return data.diffuseColor * radiance * 2.0 / cones;
+    return data.diffuseColor * radiance / cones;
   }
 #endif

ShaderLibrary/Radiances/Voxel.cginc

@@ -55,7 +55,7 @@
       float3 unit = Directions[i];
       float NdotL = dot(data.vecN, unit);
 
-      if (NdotL <= 0.0) continue;
+      if (NdotL < ConeDirectionThreshold) continue;
 
       float4 incoming = 0.0;
       float size = 1.0;
@@ -64,7 +64,7 @@
       for (
         float3 coordinate = apex + direction;
         incoming.a < 0.95 && TextureSDF(coordinate) > 0.0;
-        size *= 1.5, direction *= 1.5, coordinate = apex + direction
+        size *= 2.0, direction *= 2.0, coordinate = apex + direction
       ) {
         incoming += 0.5 * (1.0 - incoming.a) * SampleRadiance(coordinate, size);
       }
@@ -73,7 +73,7 @@
       cones++;
     }
 
-    return radiance * 2.0 / cones;
+    return radiance / cones;
   }
 
   float3 VoxelRadiance(VoxelLightingData data)

ShaderLibrary/Variables.cginc

@@ -11,6 +11,8 @@
   SamplerState linear_clamp_sampler;
   StructuredBuffer<LightSource> LightSources;
 
+  static float ConeDirectionThreshold = sin(atan(1.0/3.0));
+
   // Cone tracing direction for indirect diffuse calculations
   static float3 Directions[32] = {
     float3(+0.000000, +1.000000, +0.000000),