Merge pull request #225 from EvgeniiG/master

Improve the SSS implementation (+ *.meta files)

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

 
 // SSS parameters
 #define SSS_N_PROFILES 8
-#define SSS_UNIT_CONVERSION (1.0 / 300.0)                  // From meters to 1/3 centimeters
+#define SSS_UNIT_CONVERSION (1.0 / 300.0)                  // From 1/3 centimeters to meters
 uint   _EnableSSS;                                         // Globally toggles subsurface scattering on/off
 uint   _TransmissionFlags;                                 // 1 bit/profile; 0 = inf. thick, 1 = supports transmission
 uint   _TexturingModeFlags;                                // 1 bit/profile; 0 = PreAndPostScatter, 1 = PostScatter
         bsdfData.fresnel0 = 0.04; /* 0.028 ? */
         bsdfData.subsurfaceProfile = surfaceData.subsurfaceProfile;
         // Make the Std. Dev. of 1 correspond to the effective radius of 1 cm (three-sigma rule).
-        bsdfData.subsurfaceRadius  = SSS_UNIT_CONVERSION * surfaceData.subsurfaceRadius;
+        bsdfData.subsurfaceRadius  = SSS_UNIT_CONVERSION * surfaceData.subsurfaceRadius + 0.0001;
         bsdfData.thickness         = SSS_UNIT_CONVERSION * (_ThicknessRemaps[bsdfData.subsurfaceProfile][0] +
                                                             _ThicknessRemaps[bsdfData.subsurfaceProfile][1] * surfaceData.thickness);
         bsdfData.enableTransmission = IsBitSet(_TransmissionFlags, bsdfData.subsurfaceProfile);
         bsdfData.fresnel0 = 0.04; /* 0.028 ? */
         bsdfData.subsurfaceProfile = (SSS_N_PROFILES - 1) * inGBuffer2.a;
         // Make the Std. Dev. of 1 correspond to the effective radius of 1 cm (three-sigma rule).
-        bsdfData.subsurfaceRadius  = SSS_UNIT_CONVERSION * inGBuffer2.r;
+        bsdfData.subsurfaceRadius  = SSS_UNIT_CONVERSION * inGBuffer2.r + 0.0001;
         bsdfData.thickness         = SSS_UNIT_CONVERSION * (_ThicknessRemaps[bsdfData.subsurfaceProfile][0] +
                                                             _ThicknessRemaps[bsdfData.subsurfaceProfile][1] * inGBuffer2.g);
         bsdfData.enableTransmission = IsBitSet(_TransmissionFlags, bsdfData.subsurfaceProfile);
         [branch] if (lightData.shadowIndex >= 0 && illuminance > 0.0)
         {
             // TODO: factor out the biased position?
-            float3 biasedPositionWS = positionWS + bsdfData.normalWS * bsdfData.thickness;
+            float3 biasedPositionWS = positionWS - bsdfData.normalWS * bsdfData.thickness;
 #ifdef SHADOWS_USE_SHADOWCTXT
             float shadow = GetDirectionalShadowAttenuation(lightLoopContext.shadowContext, biasedPositionWS, lightData.shadowIndex, L, posInput.unPositionSS);
 #else
         [branch] if (lightData.shadowIndex >= 0 && illuminance > 0.0)
         {
             // TODO: factor out the common biased position?
-            float3 biasedPositionWS = positionWS + bsdfData.normalWS * bsdfData.thickness;
+            float3 biasedPositionWS = positionWS - bsdfData.normalWS * bsdfData.thickness;
             float3 offset = float3(0.0, 0.0, 0.0); // GetShadowPosOffset(nDotL, normal);
 #ifdef SHADOWS_USE_SHADOWCTXT
             float shadow = GetPunctualShadowAttenuation(lightLoopContext.shadowContext, biasedPositionWS + offset, lightData.shadowIndex, L, posInput.unPositionSS);
     [branch] if (bsdfData.enableTransmission)
     {
         // Reverse the normal.
-        illuminance = saturate(dot(-bsdfData.normalWS, L));
+        illuminance = saturate(dot(-bsdfData.normalWS, L) * clipFactor);
+        // TODO: these shadows do not work yet!
-            float3 biasedPositionWS = positionWS + bsdfData.normalWS * bsdfData.thickness;
+            float3 biasedPositionWS = positionWS - bsdfData.normalWS * bsdfData.thickness;
 #ifdef SHADOWS_USE_SHADOWCTXT
             float shadow = GetDirectionalShadowAttenuation(lightLoopContext.shadowContext, biasedPositionWS, lightData.shadowIndex, L, posInput.unPositionSS);
 #else

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

         _AnisotropyMap("AnisotropyMap", 2D) = "white" {}
 
         _SubsurfaceProfile("Subsurface Profile", Int) = 0
-        _SubsurfaceRadius("Subsurface Radius", Range(0.004, 1.0)) = 1.0
+        _SubsurfaceRadius("Subsurface Radius", Range(0.0, 1.0)) = 1.0
-        _Thickness("Thickness", Range(0.004, 1.0)) = 1.0
+        _Thickness("Thickness", Range(0.0, 1.0)) = 1.0
         _ThicknessMap("Thickness Map", 2D) = "white" {}
 
         // Wind

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitDataInternal.hlsl

     surfaceData.specular = 0.04;
 
     surfaceData.subsurfaceProfile = _SubsurfaceProfile;
+    surfaceData.subsurfaceRadius  = _SubsurfaceRadius;
+    surfaceData.thickness         = _Thickness;
+
-    surfaceData.subsurfaceRadius = SAMPLE_UVMAPPING_TEXTURE2D(_SubsurfaceRadiusMap, sampler_SubsurfaceRadiusMap, layerTexCoord.base).r * _SubsurfaceRadius;
-#else
-    surfaceData.subsurfaceRadius = _SubsurfaceRadius;
+    surfaceData.subsurfaceRadius *= SAMPLE_UVMAPPING_TEXTURE2D(_SubsurfaceRadiusMap, sampler_SubsurfaceRadiusMap, layerTexCoord.base).r;
-    surfaceData.thickness = SAMPLE_UVMAPPING_TEXTURE2D(_ThicknessMap, sampler_ThicknessMap, layerTexCoord.base).r;
-#else
-    surfaceData.thickness = _Thickness;
+    surfaceData.thickness *= SAMPLE_UVMAPPING_TEXTURE2D(_ThicknessMap, sampler_ThicknessMap, layerTexCoord.base).r;
 #endif
 
     surfaceData.coatNormalWS = float3(1.0, 0.0, 0.0);

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader

         _AnisotropyMap("AnisotropyMap", 2D) = "white" {}
 
         _SubsurfaceProfile("Subsurface Profile", Int) = 0
-        _SubsurfaceRadius("Subsurface Radius", Range(0.004, 1.0)) = 1.0
+        _SubsurfaceRadius("Subsurface Radius", Range(0.0, 1.0)) = 1.0
-        _Thickness("Thickness", Range(0.004, 1.0)) = 1.0
+        _Thickness("Thickness", Range(0.0, 1.0)) = 1.0
         _ThicknessMap("Thickness Map", 2D) = "white" {}
 
         // Wind

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Resources/CombineSubsurfaceScattering.shader

                 // TODO: ask Morten if there is a better way to do this.
                 float3 totalWeight = sampleWeight;
 
-                [unroll]
-                for (int i = 1; i < N_SAMPLES; i++)
+                uint i;  // Sample index
+
+                [unroll] // Gather samples from the center to the left (up).
+                for (i = 1; i <= N_SAMPLES / 2; i++)
                 {
                     samplePosition = posInput.unPositionSS + rotatedDirection * _FilterKernels[profileID][i].a;
                     sampleWeight   = _FilterKernels[profileID][i].rgb;
+
+                    if (any(sampleIrradiance) == false)
+                    {
+                        // The irradiance is 0. There could be two reasons for this.
+                        // Most likely, the surface fragment does not have an SSS material.
+                        // Alternatively, the surface fragment could be completely shadowed.
+                        // Our blur is energy-preserving, so 'sampleWeight' should be 0.
+                        // We can save some bandwidth by terminating the loop early.
+                        break;
+                    }
+
+                    // Apply bilateral weighting.
+                    // Ref #1: Skin Rendering by Pseudo–Separable Cross Bilateral Filtering.
+                    // Ref #2: Separable SSS, Supplementary Materials, Section E.
+                    float sampleDepth = LinearEyeDepth(rawDepth, _ZBufferParams);
+                    float zDistance   = invDistScale * sampleDepth - (invDistScale * centerPosVS.z);
+                    sampleWeight     *= exp(-zDistance * zDistance * halfRcpVariance);
+
+                    totalIrradiance += sampleWeight * sampleIrradiance;
+                    totalWeight     += sampleWeight;
+                }
+
+                [unroll] // Gather samples from the center to the right (down).
+                for (; i < N_SAMPLES; i++)
+                {
+                    samplePosition = posInput.unPositionSS + rotatedDirection * _FilterKernels[profileID][i].a;
+                    sampleWeight   = _FilterKernels[profileID][i].rgb;
+
+                    rawDepth         = LOAD_TEXTURE2D(_MainDepthTexture, samplePosition).r;
+                    sampleIrradiance = LOAD_TEXTURE2D(_IrradianceSource, samplePosition).rgb;
+
+                    if (any(sampleIrradiance) == false)
+                    {
+                        // The irradiance is 0. There could be two reasons for this.
+                        // Most likely, the surface fragment does not have an SSS material.
+                        // Alternatively, the surface fragment could be completely shadowed.
+                        // Our blur is energy-preserving, so 'sampleWeight' should be 0.
+                        // We can save some bandwidth by terminating the loop early.
+                        break;
+                    }
 
                     // Apply bilateral weighting.
                     // Ref #1: Skin Rendering by Pseudo–Separable Cross Bilateral Filtering.

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringProfile.cs

 
             Vector3 weightSum = new Vector3(0, 0, 0);
 
+            float rcpNumSamples = 1.0f / numSamples;
+
-                float u   = (i + 0.5f) / numSamples;
+                float u = (i <= numSamples / 2) ? 0.5f - i * rcpNumSamples    // The center and to the left
+                                                : (i + 0.5f) * rcpNumSamples; // From the center to the right
+
                 float pos = GaussianCombinationCdfInverse(u, maxStdDev1, maxStdDev2, lerpWeight);
                 float pdf = GaussianCombination(pos, maxStdDev1, maxStdDev2, lerpWeight);
 
     {
         private class Styles
         {
-            public readonly GUIContent   sssProfilePreview0       = new GUIContent("Profile preview");
-            public readonly GUIContent   sssProfilePreview1       = new GUIContent("Shows the fraction of light scattered from the source as radius increases to 1.");
-            public readonly GUIContent   sssProfilePreview2       = new GUIContent("Note that the intensity of the region in the center may be clamped.");
-            public readonly GUIContent   sssTransmittancePreview0 = new GUIContent("Transmittance preview");
-            public readonly GUIContent   sssTransmittancePreview1 = new GUIContent("Shows the fraction of light passing through the object as thickness increases to 1.");
-            public readonly GUIContent   sssProfileStdDev1        = new GUIContent("Standard deviation #1", "Determines the shape of the 1st Gaussian filter. Increases the strength and the radius of the blur of the corresponding color channel.");
-            public readonly GUIContent   sssProfileStdDev2        = new GUIContent("Standard deviation #2", "Determines the shape of the 2nd Gaussian filter. Increases the strength and the radius of the blur of the corresponding color channel.");
-            public readonly GUIContent   sssProfileLerpWeight     = new GUIContent("Filter interpolation", "Controls linear interpolation between the two Gaussian filters.");
-            public readonly GUIContent   sssTexturingMode         = new GUIContent("Texturing mode", "Specifies when the diffuse texture should be applied.");
-            public readonly GUIContent[] sssTexturingModeOptions  = new GUIContent[2]
+            public readonly GUIContent   sssProfilePreview0        = new GUIContent("Profile Preview");
+            public readonly GUIContent   sssProfilePreview1        = new GUIContent("Shows the fraction of light scattered from the source as radius increases to 1.");
+            public readonly GUIContent   sssProfilePreview2        = new GUIContent("Note that the intensity of the region in the center may be clamped.");
+            public readonly GUIContent   sssTransmittancePreview0  = new GUIContent("Transmittance Preview");
+            public readonly GUIContent   sssTransmittancePreview1  = new GUIContent("Shows the fraction of light passing through the object as thickness increases to 1.");
+            public readonly GUIContent   sssProfileStdDev1         = new GUIContent("Standard Deviation #1", "Determines the shape of the 1st Gaussian filter. Increases the strength and the radius of the blur of the corresponding color channel.");
+            public readonly GUIContent   sssProfileStdDev2         = new GUIContent("Standard Deviation #2", "Determines the shape of the 2nd Gaussian filter. Increases the strength and the radius of the blur of the corresponding color channel.");
+            public readonly GUIContent   sssProfileLerpWeight      = new GUIContent("Filter Interpolation", "Controls linear interpolation between the two Gaussian filters.");
+            public readonly GUIContent   sssTexturingMode          = new GUIContent("Texturing Mode", "Specifies when the diffuse texture should be applied.");
+            public readonly GUIContent[] sssTexturingModeOptions   = new GUIContent[2]
-            public readonly GUIContent   sssProfileTransmission   = new GUIContent("Enable transmission", "Toggles simulation of light passing through thin objects. Depends on the thickness of the material.");
-            public readonly GUIContent   sssProfileThicknessRemap = new GUIContent("Thickness remap", "Remaps the thickness parameter from [0, 1] to the desired range.");
+            public readonly GUIContent   sssProfileTransmission    = new GUIContent("Enable Transmission", "Toggles simulation of light passing through thin objects. Depends on the thickness of the material.");
+            public readonly GUIContent   sssProfileMinMaxThickness = new GUIContent("Min-Max Thickness", "Shows the values of the thickness remap below.");
+            public readonly GUIContent   sssProfileThicknessRemap  = new GUIContent("Thickness Remap", "Remaps the thickness parameter from [0, 1] to the desired range.");
-            public readonly GUIStyle     centeredMiniBoldLabel    = new GUIStyle(GUI.skin.label);
+            public readonly GUIStyle     centeredMiniBoldLabel     = new GUIStyle(GUI.skin.label);
 
             public Styles()
             {
                 m_TexturingMode.intValue = EditorGUILayout.Popup(styles.sssTexturingMode, m_TexturingMode.intValue, styles.sssTexturingModeOptions);
                 EditorGUILayout.PropertyField(m_Transmission, styles.sssProfileTransmission);
 
+
+                EditorGUILayout.PropertyField(m_ThicknessRemap, styles.sssProfileMinMaxThickness);
-                EditorGUILayout.LabelField("Min thickness: ", thicknessRemap.x.ToString());
-                EditorGUILayout.LabelField("Max thickness: ", thicknessRemap.y.ToString());
-                EditorGUILayout.MinMaxSlider(styles.sssProfileThicknessRemap, ref thicknessRemap.x, ref thicknessRemap.y, 0, 10);
+                EditorGUILayout.MinMaxSlider(styles.sssProfileThicknessRemap, ref thicknessRemap.x, ref thicknessRemap.y, 0, 100);
                 m_ThicknessRemap.vector2Value = thicknessRemap;
 
                 EditorGUILayout.Space();

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