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Merge pull request #190 from EvgeniiG/master

Specify SSS profiles as assets in the material UI
/fptl_cleanup
GitHub 8 年前
当前提交
05d5c60c
共有 14 个文件被更改,包括 660 次插入457 次删除
  1. 100
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Editor/HDRenderPipelineInspector.cs
  2. 81
      Assets/ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipeline.asset
  3. 11
      Assets/ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipeline.cs
  4. 33
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Editor/LitUI.cs
  5. 29
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl
  6. 2
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader
  7. 5
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Resources/CombineSubsurfaceScattering.shader
  8. 2
      Assets/ScriptableRenderPipeline/HDRenderPipeline/SceneSettings/Resources/DrawGaussianProfile.shader
  9. 35
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Default SSS Profile.asset
  10. 9
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Default SSS Profile.asset.meta
  11. 490
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringProfile.cs
  12. 12
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringProfile.cs.meta
  13. 300
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringSettings.cs
  14. 8
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringSettings.cs.meta

100
Assets/ScriptableRenderPipeline/HDRenderPipeline/Editor/HDRenderPipelineInspector.cs


public readonly GUIContent shadowsAtlasWidth = new GUIContent("Atlas width");
public readonly GUIContent shadowsAtlasHeight = new GUIContent("Atlas height");
// Subsurface Scaterring Settings
public readonly GUIContent[] sssProfiles = new GUIContent[SubsurfaceScatteringSettings.maxNumProfiles] { new GUIContent("Profile #0"), new GUIContent("Profile #1"), new GUIContent("Profile #2"), new GUIContent("Profile #3"), new GUIContent("Profile #4"), new GUIContent("Profile #5"), new GUIContent("Profile #6"), new GUIContent("Profile #7") };
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 sssNumProfiles = new GUIContent("Number of profiles");
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 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 sssTexturingMode = new GUIContent("Texturing mode", "Specifies when the diffuse texture should be applied.");
// Subsurface Scattering Settings
public readonly GUIContent[] sssProfiles = new GUIContent[SubsurfaceScatteringSettings.maxNumProfiles] { new GUIContent("Profile #0"), new GUIContent("Profile #1"), new GUIContent("Profile #2"), new GUIContent("Profile #3"), new GUIContent("Profile #4"), new GUIContent("Profile #5"), new GUIContent("Profile #6"), new GUIContent("Profile #7") };
public readonly GUIContent sssNumProfiles = new GUIContent("Number of profiles");
public readonly GUIContent sssTexturingMode = new GUIContent("Texturing mode", "Specifies when the diffuse texture should be applied.");
public readonly GUIStyle centeredMiniBoldLabel = new GUIStyle(GUI.skin.label);
// Tile pass Settings
public readonly GUIContent tileLightLoopSettings = new GUIContent("Tile Light Loop Settings");

public readonly GUIContent lightingDebugAlbedo = new GUIContent("Lighting Debug Albedo");
public readonly GUIContent lightingDisplaySkyReflection = new GUIContent("Display Sky Reflection");
public readonly GUIContent lightingDisplaySkyReflectionMipmap = new GUIContent("Reflection Mipmap");
public Styles()
{
centeredMiniBoldLabel.alignment = TextAnchor.MiddleCenter;
centeredMiniBoldLabel.fontSize = 10;
centeredMiniBoldLabel.fontStyle = FontStyle.Bold;
}
}
private static Styles s_Styles = null;

SerializedProperty m_Profiles = null;
SerializedProperty m_NumProfiles = null;
// Subsurface Scattering internal data
private Material m_ProfileMaterial, m_TransmittanceMaterial;
private RenderTexture[] m_ProfileImages, m_TransmittanceImages;
private void InitializeProperties()
{
// Global debug

// Subsurface Scattering Settings
m_TexturingMode = FindProperty(x => x.sssSettings.texturingMode);
m_Profiles = FindProperty(x => x.sssSettings.profiles);
m_NumProfiles = m_Profiles.FindPropertyRelative("Array.size");
}
void InitializeSSS()
{
m_ProfileMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/DrawGaussianProfile");
m_TransmittanceMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/DrawTransmittanceGraph");
m_ProfileImages = new RenderTexture[SubsurfaceScatteringSettings.maxNumProfiles];
m_TransmittanceImages = new RenderTexture[SubsurfaceScatteringSettings.maxNumProfiles];
for (int i = 0; i < SubsurfaceScatteringSettings.maxNumProfiles; i++)
{
m_ProfileImages[i] = new RenderTexture(256, 256, 0, RenderTextureFormat.DefaultHDR);
m_TransmittanceImages[i] = new RenderTexture(16, 256, 0, RenderTextureFormat.DefaultHDR);
}
m_Profiles = FindProperty(x => x.sssSettings.profiles);
m_NumProfiles = m_Profiles.FindPropertyRelative("Array.size");
}
SerializedProperty FindProperty<TValue>(Expression<Func<HDRenderPipeline, TValue>> expr)

{
SerializedProperty profile = m_Profiles.GetArrayElementAtIndex(i);
EditorGUILayout.PropertyField(profile, styles.sssProfiles[i]);
if (profile.isExpanded)
{
EditorGUI.indentLevel++;
SerializedProperty profileStdDev1 = profile.FindPropertyRelative("stdDev1");
SerializedProperty profileStdDev2 = profile.FindPropertyRelative("stdDev2");
SerializedProperty profileLerpWeight = profile.FindPropertyRelative("lerpWeight");
SerializedProperty profileTransmission = profile.FindPropertyRelative("enableTransmission");
SerializedProperty profileThicknessRemap = profile.FindPropertyRelative("thicknessRemap");
EditorGUILayout.PropertyField(profileStdDev1, styles.sssProfileStdDev1);
EditorGUILayout.PropertyField(profileStdDev2, styles.sssProfileStdDev2);
EditorGUILayout.PropertyField(profileLerpWeight, styles.sssProfileLerpWeight);
EditorGUILayout.PropertyField(profileTransmission, styles.sssProfileTransmission);
Vector2 thicknessRemap = profileThicknessRemap.vector2Value;
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);
profileThicknessRemap.vector2Value = thicknessRemap;
EditorGUILayout.Space();
EditorGUILayout.LabelField(styles.sssProfilePreview0, styles.centeredMiniBoldLabel);
EditorGUILayout.LabelField(styles.sssProfilePreview1, EditorStyles.centeredGreyMiniLabel);
EditorGUILayout.LabelField(styles.sssProfilePreview2, EditorStyles.centeredGreyMiniLabel);
EditorGUILayout.Space();
// Draw the profile.
m_ProfileMaterial.SetColor("_StdDev1", profileStdDev1.colorValue);
m_ProfileMaterial.SetColor("_StdDev2", profileStdDev2.colorValue);
m_ProfileMaterial.SetFloat("_LerpWeight", profileLerpWeight.floatValue);
EditorGUI.DrawPreviewTexture(GUILayoutUtility.GetRect(256, 256), m_ProfileImages[i], m_ProfileMaterial, ScaleMode.ScaleToFit, 1.0f);
EditorGUILayout.Space();
EditorGUILayout.LabelField(styles.sssTransmittancePreview0, styles.centeredMiniBoldLabel);
EditorGUILayout.LabelField(styles.sssTransmittancePreview1, EditorStyles.centeredGreyMiniLabel);
EditorGUILayout.Space();
// Draw the transmittance graph.
m_TransmittanceMaterial.SetColor("_StdDev1", profileStdDev1.colorValue);
m_TransmittanceMaterial.SetColor("_StdDev2", profileStdDev2.colorValue);
m_TransmittanceMaterial.SetFloat("_LerpWeight", profileLerpWeight.floatValue);
m_TransmittanceMaterial.SetVector("_ThicknessRemap", profileThicknessRemap.vector2Value);
EditorGUI.DrawPreviewTexture(GUILayoutUtility.GetRect(16, 16), m_TransmittanceImages[i], m_TransmittanceMaterial, ScaleMode.ScaleToFit, 16.0f);
EditorGUILayout.Space();
EditorGUI.indentLevel--;
}
}
EditorGUI.indentLevel--;

public void OnEnable()
{
InitializeProperties();
InitializeSSS();
}
public override void OnInspectorGUI()

81
Assets/ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipeline.asset


type: 2}
globalDebugSettings:
debugOverlayRatio: 0.33
displayMaterialDebug: 0
displayRenderingDebug: 0
displayMaterialDebug: 1
displayRenderingDebug: 1
displayLightingDebug: 0
materialDebugSettings:
debugViewMaterial: 0

overrideSmoothness: 0
overrideSmoothnessValue: 0.5
debugLightingAlbedo: {r: 0.5, g: 0.5, b: 0.5, a: 1}
displaySkyReflection: 0
skyReflectionMipmap: 0
renderingDebugSettings:
displayOpaqueObjects: 1
displayTransparentObjects: 1

useDepthPrepass: 0
sssSettings:
numProfiles: 1
texturingMode: 0
- stdDev1: {r: 0.3, g: 0.3, b: 0.3, a: 0}
stdDev2: {r: 0.6, g: 0.6, b: 0.6, a: 0}
lerpWeight: 0.5
enableTransmission: 0
thicknessRemap: {x: 0, y: 3}
m_FilterKernel:
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: -0.6594821}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: -0.3561445}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: -0.16454786}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: -0.000000048879357}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: 0.16454786}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: 0.35614443}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: 0.659482}
m_HalfRcpVariances:
- {x: 5.5555553, y: 5.5555553, z: 5.5555553}
- {x: 1.3888888, y: 1.3888888, z: 1.3888888}
m_HalfRcpWeightedVariances: {x: 2.4691355, y: 2.4691355, z: 2.4691355, w: 2.4691355}
- {fileID: 11400000, guid: 09521380d86baee43bf09b32473ea5f3, type: 2}
- 3
- 0
- 1
- 1
- 0
- 0
- 0

- 0
- 0
halfRcpVariancesAndLerpWeights:
- {x: 5.5555553, y: 5.5555553, z: 5.5555553, w: 0.5}
- {x: 1.3888888, y: 1.3888888, z: 1.3888888, w: 0.5}
- {x: 5.5555553, y: 5.5555553, z: 5.5555553, w: 0.5}
- {x: 1.3888888, y: 1.3888888, z: 1.3888888, w: 0.5}
- {x: 0, y: 0, z: 0, w: 0}

- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
halfRcpWeightedVariances:
- {x: 2.4691355, y: 2.4691355, z: 2.4691355, w: 2.4691355}
- {x: 2.4691355, y: 2.4691355, z: 2.4691355, w: 2.4691355}
halfRcpWeightedVariances:
- {x: 2.4691355, y: 2.4691355, z: 2.4691355, w: 2.4691355}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
filterKernels:
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.7609476}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.49358216}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.33642715}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.21256521}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.10326859}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.000000048879357}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.10326859}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.21256521}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.33642715}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.4935822}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.7609475}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.7609476}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.49358216}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.33642715}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.21256521}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.10326859}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.000000048879357}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.10326859}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.21256521}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.33642715}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.4935822}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.7609475}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}

- {x: 0, y: 0, z: 0, w: 0}
filterKernels:
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: -0.6594821}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: -0.3561445}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: -0.16454786}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: -0.000000048879357}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: 0.16454786}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: 0.35614443}
- {x: 0.14285715, y: 0.14285715, z: 0.14285715, w: 0.659482}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}
- {x: 0, y: 0, z: 0, w: 0}

11
Assets/ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipeline.cs


public SubsurfaceScatteringSettings sssSettings = new SubsurfaceScatteringSettings();
[SerializeField]
ShadowSettings m_ShadowSettings = ShadowSettings.Default;
[SerializeField] TextureSettings m_TextureSettings = TextureSettings.Default;
ShadowSettings m_ShadowSettings = ShadowSettings.Default;
[SerializeField]
TextureSettings m_TextureSettings = TextureSettings.Default;
public ShadowSettings shadowSettings { get { return m_ShadowSettings; } }
public TextureSettings textureSettings { get { return m_TextureSettings; } set { m_TextureSettings = value; } }

return m_SkySettings;
}
}
public void ApplyDebugSettings()
{
m_ShadowSettings.enabled = globalDebugSettings.lightingDebugSettings.enableShadows;

get { return m_Owner.globalDebugSettings; }
}
public SubsurfaceScatteringSettings sssSettings
{
get { return m_Owner.sssSettings; }
}
public HDRenderPipelineInstance(HDRenderPipeline owner)
{
m_Owner = owner;

33
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Editor/LitUI.cs


using System;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Experimental.Rendering;
using UnityEngine.Experimental.Rendering.HDPipeline;
namespace UnityEditor.Experimental.Rendering.HDPipeline

protected MaterialProperty detailSmoothnessScale = null;
protected const string kDetailSmoothnessScale = "_DetailSmoothnessScale";
protected MaterialProperty subsurfaceProfile = null;
protected const string kSubsurfaceProfile = "_SubsurfaceProfile";
protected SubsurfaceScatteringProfile subsurfaceProfile = null;
protected MaterialProperty subsurfaceProfileID = null;
protected const string kSubsurfaceProfileID = "_SubsurfaceProfile";
protected MaterialProperty subsurfaceRadius = null;
protected const string kSubsurfaceRadius = "_SubsurfaceRadius";
protected MaterialProperty subsurfaceRadiusMap = null;

detailSmoothnessScale = FindProperty(kDetailSmoothnessScale, props);
// Sub surface
subsurfaceProfile = FindProperty(kSubsurfaceProfile, props);
subsurfaceProfileID = FindProperty(kSubsurfaceProfileID, props);
subsurfaceRadius = FindProperty(kSubsurfaceRadius, props);
subsurfaceRadiusMap = FindProperty(kSubsurfaceRadiusMap, props);
thickness = FindProperty(kThickness, props);

protected void ShaderSSSInputGUI()
{
m_MaterialEditor.ShaderProperty(subsurfaceProfile, Styles.subsurfaceProfileText);
if (subsurfaceProfile == null)
{
int profileID = (int)subsurfaceProfileID.floatValue;
HDRenderPipelineInstance hdPipeline = RenderPipelineManager.currentPipeline as HDRenderPipelineInstance;
if (profileID >= 0 && profileID < hdPipeline.sssSettings.profiles.Length)
{
// This is a valid profile ID.
subsurfaceProfile = hdPipeline.sssSettings.profiles[profileID];
}
else
{
subsurfaceProfile = SubsurfaceScatteringProfile.defaultProfile;
}
// Refresh the ID of the profile.
hdPipeline.sssSettings.OnValidate();
}
// Extract the profile ID.
subsurfaceProfile = EditorGUILayout.ObjectField(Styles.subsurfaceProfileText, subsurfaceProfile, subsurfaceProfile.GetType(), false, null) as SubsurfaceScatteringProfile;
subsurfaceProfileID.floatValue = subsurfaceProfile.settingsIndex;
m_MaterialEditor.ShaderProperty(subsurfaceRadius, Styles.subsurfaceRadiusText);
m_MaterialEditor.TexturePropertySingleLine(Styles.subsurfaceRadiusMapText, subsurfaceRadiusMap);
m_MaterialEditor.ShaderProperty(thickness, Styles.thicknessText);

29
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl


#define LTC_MULTI_GGX_FRESNEL_DISNEY_DIFFUSE_INDEX 2 // RGB, A unused
// SSS parameters
#define N_PROFILES 8
uint _TransmissionFlags; // One bit per profile; 1 = enabled
float _ThicknessRemaps[N_PROFILES][2]; // Remap: 0 = start, 1 = end - start
float4 _HalfRcpVariancesAndLerpWeights[N_PROFILES][2]; // 2x Gaussians per color channel, A is the the associated interpolation weight
#define SSS_N_PROFILES 8
#define SSS_UNIT_CONVERSION (1.0 / 300.0) // From meters to 1/3 centimeters
uint _TransmissionFlags; // One bit per profile; 1 = enabled
float _ThicknessRemaps[SSS_N_PROFILES][2]; // Remap: 0 = start, 1 = end - start
float4 _HalfRcpVariancesAndLerpWeights[SSS_N_PROFILES][2]; // 2x Gaussians per color channel, A is the the associated interpolation weight
//-----------------------------------------------------------------------------
// Helper functions/variable specific to this material

// Thickness and SSS radius are decoupled for artists.
// In theory, we should modify the thickness by the inverse of the radius scale of the profile.
// thickness /= radiusScale;
thickness *= 100;
thickness /= SSS_UNIT_CONVERSION;
float t2 = thickness * thickness;

bsdfData.diffuseColor = surfaceData.baseColor;
bsdfData.fresnel0 = 0.028; // TODO take from subsurfaceProfile
bsdfData.subsurfaceProfile = surfaceData.subsurfaceProfile;
bsdfData.subsurfaceRadius = 0.01 * surfaceData.subsurfaceRadius;
bsdfData.thickness = 0.01 * (_ThicknessRemaps[bsdfData.subsurfaceProfile][0] +
_ThicknessRemaps[bsdfData.subsurfaceProfile][1] * surfaceData.thickness);
// 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.thickness = SSS_UNIT_CONVERSION * (_ThicknessRemaps[bsdfData.subsurfaceProfile][0] +
_ThicknessRemaps[bsdfData.subsurfaceProfile][1] * surfaceData.thickness);
bsdfData.enableTransmission = (1 << bsdfData.subsurfaceProfile) & _TransmissionFlags;
if (bsdfData.enableTransmission)
{

}
else if (surfaceData.materialId == MATERIALID_LIT_SSS)
{
outGBuffer2 = float4(surfaceData.subsurfaceRadius, surfaceData.thickness, 0.0, surfaceData.subsurfaceProfile / 8.0); // Number of profile not define yet
outGBuffer2 = float4(surfaceData.subsurfaceRadius, surfaceData.thickness, 0.0, surfaceData.subsurfaceProfile * rcp(SSS_N_PROFILES));
}
else if (surfaceData.materialId == MATERIALID_LIT_CLEAR_COAT)
{

{
bsdfData.diffuseColor = baseColor;
bsdfData.fresnel0 = 0.028; // TODO take from subsurfaceProfile
bsdfData.subsurfaceProfile = 8.00 * inGBuffer2.a;
bsdfData.subsurfaceRadius = 0.01 * inGBuffer2.r;
bsdfData.thickness = 0.01 * (_ThicknessRemaps[bsdfData.subsurfaceProfile][0] +
_ThicknessRemaps[bsdfData.subsurfaceProfile][1] * inGBuffer2.g);
bsdfData.subsurfaceProfile = SSS_N_PROFILES * 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.thickness = SSS_UNIT_CONVERSION * (_ThicknessRemaps[bsdfData.subsurfaceProfile][0] +
_ThicknessRemaps[bsdfData.subsurfaceProfile][1] * inGBuffer2.g);
bsdfData.enableTransmission = (1 << bsdfData.subsurfaceProfile) & _TransmissionFlags;
if (bsdfData.enableTransmission)
{

2
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader


_Anisotropy("Anisotropy", Range(0.0, 1.0)) = 0
_AnisotropyMap("AnisotropyMap", 2D) = "white" {}
_SubsurfaceProfile("Subsurface Profile", Int) = 0
_SubsurfaceProfile("Subsurface Profile", Float) = 0
_SubsurfaceRadius("Subsurface Radius", Range(0.004, 1.0)) = 1.0
_SubsurfaceRadiusMap("Subsurface Radius Map", 2D) = "white" {}
_Thickness("Thickness", Range(0.004, 1.0)) = 1.0

5
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Resources/CombineSubsurfaceScattering.shader


PositionInputs posInput = GetPositionInput(input.positionCS.xy, _ScreenSize.zw, uint2(0, 0));
float2 gBufferData = LOAD_TEXTURE2D(_GBufferTexture2, posInput.unPositionSS).ra;
int profileID = int(gBufferData.y * N_PROFILES);
float distScale = gBufferData.x * 0.01;
int profileID = N_PROFILES * gBufferData.y;
// Make the Std. Dev. of 1 correspond to the effective radius of 1 cm (three-sigma rule).
float distScale = (1.0 / 300.0) * gBufferData.x;
float invDistScale = rcp(distScale);
// Reconstruct the view-space position.

2
Assets/ScriptableRenderPipeline/HDRenderPipeline/SceneSettings/Resources/DrawGaussianProfile.shader


float4 Frag(Varyings input) : SV_Target
{
float dist = length(2 * input.texcoord - 1);
float dist = length(input.texcoord - 0.5);
float3 var1 = _StdDev1.rgb * _StdDev1.rgb;
float3 var2 = _StdDev2.rgb * _StdDev2.rgb;

35
Assets/ScriptableRenderPipeline/HDRenderPipeline/Default SSS Profile.asset


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m_Script: {fileID: 11500000, guid: a6e7465350bf0d248b4799d98e18cd24, type: 3}
m_Name: Default SSS Profile
m_EditorClassIdentifier:
stdDev1: {r: 0.3, g: 0.3, b: 0.3, a: 0}
stdDev2: {r: 0.6, g: 0.6, b: 0.6, a: 0}
lerpWeight: 0.5
enableTransmission: 0
thicknessRemap: {x: 0, y: 1}
settingsIndex: 0
m_FilterKernel:
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.7609476}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.49358216}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.33642715}
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- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: -0.000000048879357}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.10326859}
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- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.4935822}
- {x: 0.09090909, y: 0.09090909, z: 0.09090909, w: 0.7609475}
m_HalfRcpVariances:
- {x: 5.5555553, y: 5.5555553, z: 5.5555553}
- {x: 1.3888888, y: 1.3888888, z: 1.3888888}
m_HalfRcpWeightedVariances: {x: 2.4691355, y: 2.4691355, z: 2.4691355, w: 2.4691355}

9
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490
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringProfile.cs


using System;
#if UNITY_EDITOR
using UnityEditor;
#endif
namespace UnityEngine.Experimental.Rendering.HDPipeline
{
[Serializable]
public class SubsurfaceScatteringProfile : ScriptableObject
{
public const int numSamples = 11; // Must be an odd number
[SerializeField, ColorUsage(false, true, 0.05f, 2.0f, 1.0f, 1.0f)]
public Color stdDev1;
[SerializeField, ColorUsage(false, true, 0.05f, 2.0f, 1.0f, 1.0f)]
public Color stdDev2;
[SerializeField]
public float lerpWeight;
[SerializeField]
public bool enableTransmission;
[SerializeField]
public Vector2 thicknessRemap;
[SerializeField] [HideInInspector]
public int settingsIndex;
[SerializeField] [HideInInspector]
Vector4[] m_FilterKernel;
[SerializeField] [HideInInspector]
Vector3[] m_HalfRcpVariances;
[SerializeField] [HideInInspector]
Vector4 m_HalfRcpWeightedVariances;
private static SubsurfaceScatteringProfile s_DefaultProfile = null; // Singleton
// --- Public Methods ---
public static SubsurfaceScatteringProfile defaultProfile
{
get
{
if (s_DefaultProfile == null)
{
s_DefaultProfile = CreateInstance<SubsurfaceScatteringProfile>();
AssetDatabase.CreateAsset(s_DefaultProfile, "Assets/ScriptableRenderPipeline/HDRenderPipeline/Default SSS Profile.asset");
AssetDatabase.SaveAssets();
}
return s_DefaultProfile;
}
}
public SubsurfaceScatteringProfile()
{
stdDev1 = new Color(0.3f, 0.3f, 0.3f, 0.0f);
stdDev2 = new Color(0.6f, 0.6f, 0.6f, 0.0f);
lerpWeight = 0.5f;
enableTransmission = false;
thicknessRemap = new Vector2(0, 1);
settingsIndex = 0;
UpdateKernelAndVarianceData();
}
public Vector4[] filterKernel
{
// Set via UpdateKernelAndVarianceData().
get { return m_FilterKernel; }
}
public Vector3[] halfRcpVariances
{
// Set via UpdateKernelAndVarianceData().
get { return m_HalfRcpVariances; }
}
public Vector4 halfRcpWeightedVariances
{
// Set via UpdateKernelAndVarianceData().
get { return m_HalfRcpWeightedVariances; }
}
public void UpdateKernelAndVarianceData()
{
if (m_FilterKernel == null || m_FilterKernel.Length != numSamples)
{
m_FilterKernel = new Vector4[numSamples];
}
if (m_HalfRcpVariances == null)
{
m_HalfRcpVariances = new Vector3[2];
}
// Our goal is to blur the image using a filter which is represented
// as a product of a linear combination of two normalized 1D Gaussians
// as suggested by Jimenez et al. in "Separable Subsurface Scattering".
// A normalized (i.e. energy-preserving) 1D Gaussian with the mean of 0
// is defined as follows: G1(x, v) = exp(-x * x / (2 * v)) / sqrt(2 * Pi * v),
// where 'v' is variance and 'x' is the radial distance from the origin.
// Using the weight 'w', our 1D and the resulting 2D filters are given as:
// A1(v1, v2, w, x) = G1(x, v1) * (1 - w) + G1(r, v2) * w,
// A2(v1, v2, w, x, y) = A1(v1, v2, w, x) * A1(v1, v2, w, y).
// The resulting filter function is a non-Gaussian PDF.
// It is separable by design, but generally not radially symmetric.
// Find the widest Gaussian across 3 color channels.
float maxStdDev1 = Mathf.Max(stdDev1.r, stdDev1.g, stdDev1.b);
float maxStdDev2 = Mathf.Max(stdDev2.r, stdDev2.g, stdDev2.b);
Vector3 weightSum = new Vector3(0, 0, 0);
// Importance sample the linear combination of two Gaussians.
for (uint i = 0; i < numSamples; i++)
{
float u = (i + 0.5f) / numSamples;
float pos = GaussianCombinationCdfInverse(u, maxStdDev1, maxStdDev2, lerpWeight);
float pdf = GaussianCombination(pos, maxStdDev1, maxStdDev2, lerpWeight);
Vector3 val;
val.x = GaussianCombination(pos, stdDev1.r, stdDev2.r, lerpWeight);
val.y = GaussianCombination(pos, stdDev1.g, stdDev2.g, lerpWeight);
val.z = GaussianCombination(pos, stdDev1.b, stdDev2.b, lerpWeight);
// We do not divide by 'numSamples' since we will renormalize, anyway.
m_FilterKernel[i].x = val.x * (1 / pdf);
m_FilterKernel[i].y = val.y * (1 / pdf);
m_FilterKernel[i].z = val.z * (1 / pdf);
m_FilterKernel[i].w = pos;
weightSum.x += m_FilterKernel[i].x;
weightSum.y += m_FilterKernel[i].y;
weightSum.z += m_FilterKernel[i].z;
}
// Renormalize the weights to conserve energy.
for (uint i = 0; i < numSamples; i++)
{
m_FilterKernel[i].x *= 1 / weightSum.x;
m_FilterKernel[i].y *= 1 / weightSum.y;
m_FilterKernel[i].z *= 1 / weightSum.z;
}
// Store (1 / (2 * Variance)) per color channel per Gaussian.
m_HalfRcpVariances[0].x = 0.5f / (stdDev1.r * stdDev1.r);
m_HalfRcpVariances[0].y = 0.5f / (stdDev1.g * stdDev1.g);
m_HalfRcpVariances[0].z = 0.5f / (stdDev1.b * stdDev1.b);
m_HalfRcpVariances[1].x = 0.5f / (stdDev2.r * stdDev2.r);
m_HalfRcpVariances[1].y = 0.5f / (stdDev2.g * stdDev2.g);
m_HalfRcpVariances[1].z = 0.5f / (stdDev2.b * stdDev2.b);
Vector4 weightedStdDev;
weightedStdDev.x = Mathf.Lerp(stdDev1.r, stdDev2.r, lerpWeight);
weightedStdDev.y = Mathf.Lerp(stdDev1.g, stdDev2.g, lerpWeight);
weightedStdDev.z = Mathf.Lerp(stdDev1.b, stdDev2.b, lerpWeight);
weightedStdDev.w = Mathf.Lerp(maxStdDev1, maxStdDev2, lerpWeight);
// Store (1 / (2 * WeightedVariance)) per color channel.
m_HalfRcpWeightedVariances.x = 0.5f / (weightedStdDev.x * weightedStdDev.x);
m_HalfRcpWeightedVariances.y = 0.5f / (weightedStdDev.y * weightedStdDev.y);
m_HalfRcpWeightedVariances.z = 0.5f / (weightedStdDev.z * weightedStdDev.z);
m_HalfRcpWeightedVariances.w = 0.5f / (weightedStdDev.w * weightedStdDev.w);
}
// --- Private Methods ---
static float Gaussian(float x, float stdDev)
{
float variance = stdDev * stdDev;
return Mathf.Exp(-x * x / (2 * variance)) / Mathf.Sqrt(2 * Mathf.PI * variance);
}
static float GaussianCombination(float x, float stdDev1, float stdDev2, float lerpWeight)
{
return Mathf.Lerp(Gaussian(x, stdDev1), Gaussian(x, stdDev2), lerpWeight);
}
static float RationalApproximation(float t)
{
// Abramowitz and Stegun formula 26.2.23.
// The absolute value of the error should be less than 4.5 e-4.
float[] c = {2.515517f, 0.802853f, 0.010328f};
float[] d = {1.432788f, 0.189269f, 0.001308f};
return t - ((c[2] * t + c[1]) * t + c[0]) / (((d[2] * t + d[1]) * t + d[0]) * t + 1.0f);
}
// Ref: https://www.johndcook.com/blog/csharp_phi_inverse/
static float NormalCdfInverse(float p, float stdDev)
{
float x;
if (p < 0.5)
{
// F^-1(p) = - G^-1(p)
x = -RationalApproximation(Mathf.Sqrt(-2.0f * Mathf.Log(p)));
}
else
{
// F^-1(p) = G^-1(1-p)
x = RationalApproximation(Mathf.Sqrt(-2.0f * Mathf.Log(1.0f - p)));
}
return x * stdDev;
}
static float GaussianCombinationCdfInverse(float p, float stdDev1, float stdDev2, float lerpWeight)
{
return Mathf.Lerp(NormalCdfInverse(p, stdDev1), NormalCdfInverse(p, stdDev2), lerpWeight);
}
}
[Serializable]
public class SubsurfaceScatteringSettings
{
public enum TexturingMode : int { PreScatter = 0, PostScatter = 1, PreAndPostScatter = 2, MaxValue = 2 };
public const int maxNumProfiles = 8;
public int numProfiles;
public TexturingMode texturingMode;
public int transmissionFlags;
public SubsurfaceScatteringProfile[] profiles;
public float[] thicknessRemaps;
public Vector4[] halfRcpVariancesAndLerpWeights;
public Vector4[] halfRcpWeightedVariances;
public Vector4[] filterKernels;
// --- Public Methods ---
public SubsurfaceScatteringSettings()
{
numProfiles = 1;
texturingMode = TexturingMode.PreScatter;
profiles = null;
thicknessRemaps = null;
halfRcpVariancesAndLerpWeights = null;
halfRcpWeightedVariances = null;
filterKernels = null;
}
public void OnValidate()
{
if (profiles == null)
{
// It will be called during the initialization of the HDRenderPipeline.
CreateProfiles();
}
numProfiles = Math.Max(1, Math.Min(profiles.Length, maxNumProfiles));
if (profiles.Length != numProfiles)
{
Array.Resize(ref profiles, numProfiles);
}
for (int i = 0; i < numProfiles; i++)
{
if (profiles[i] == null)
{
// No invalid/empty assets allowed!
profiles[i] = SubsurfaceScatteringProfile.defaultProfile;
}
// Assign profile IDs.
profiles[i].settingsIndex = i;
}
texturingMode = (TexturingMode)Math.Max(0, Math.Min((int)texturingMode, (int)TexturingMode.MaxValue));
if (thicknessRemaps == null || thicknessRemaps.Length != (maxNumProfiles * 2))
{
thicknessRemaps = new float[maxNumProfiles * 2];
}
if (halfRcpVariancesAndLerpWeights == null || halfRcpVariancesAndLerpWeights.Length != (maxNumProfiles * 2))
{
halfRcpVariancesAndLerpWeights = new Vector4[maxNumProfiles * 2];
}
if (halfRcpWeightedVariances == null || halfRcpWeightedVariances.Length != maxNumProfiles)
{
halfRcpWeightedVariances = new Vector4[maxNumProfiles];
}
if (filterKernels == null || filterKernels.Length != (maxNumProfiles * SubsurfaceScatteringProfile.numSamples))
{
filterKernels = new Vector4[maxNumProfiles * SubsurfaceScatteringProfile.numSamples];
}
transmissionFlags = 0;
Color c = new Color();
for (int i = 0; i < numProfiles; i++)
{
transmissionFlags |= (profiles[i].enableTransmission ? 1 : 0) << i;
c.r = Mathf.Clamp(profiles[i].stdDev1.r, 0.05f, 2.0f);
c.g = Mathf.Clamp(profiles[i].stdDev1.g, 0.05f, 2.0f);
c.b = Mathf.Clamp(profiles[i].stdDev1.b, 0.05f, 2.0f);
c.a = 0.0f;
profiles[i].stdDev1 = c;
c.r = Mathf.Clamp(profiles[i].stdDev2.r, 0.05f, 2.0f);
c.g = Mathf.Clamp(profiles[i].stdDev2.g, 0.05f, 2.0f);
c.b = Mathf.Clamp(profiles[i].stdDev2.b, 0.05f, 2.0f);
c.a = 0.0f;
profiles[i].stdDev2 = c;
profiles[i].lerpWeight = Mathf.Clamp01(profiles[i].lerpWeight);
profiles[i].thicknessRemap.x = Mathf.Clamp(profiles[i].thicknessRemap.x, 0, profiles[i].thicknessRemap.y);
profiles[i].thicknessRemap.y = Mathf.Max(profiles[i].thicknessRemap.x, profiles[i].thicknessRemap.y);
profiles[i].UpdateKernelAndVarianceData();
}
// Use the updated data to fill the cache.
for (int i = 0; i < numProfiles; i++)
{
thicknessRemaps[2 * i] = profiles[i].thicknessRemap.x;
thicknessRemaps[2 * i + 1] = profiles[i].thicknessRemap.y - profiles[i].thicknessRemap.x;
halfRcpVariancesAndLerpWeights[2 * i] = profiles[i].halfRcpVariances[0];
halfRcpVariancesAndLerpWeights[2 * i].w = 1.0f - profiles[i].lerpWeight;
halfRcpVariancesAndLerpWeights[2 * i + 1] = profiles[i].halfRcpVariances[1];
halfRcpVariancesAndLerpWeights[2 * i + 1].w = profiles[i].lerpWeight;
halfRcpWeightedVariances[i] = profiles[i].halfRcpWeightedVariances;
for (int j = 0, n = SubsurfaceScatteringProfile.numSamples; j < n; j++)
{
filterKernels[n * i + j] = profiles[i].filterKernel[j];
}
}
}
// --- Private Methods ---
// Limitation of Unity - cannot create assets in the constructor.
public void CreateProfiles()
{
profiles = new SubsurfaceScatteringProfile[numProfiles];
for (int i = 0; i < numProfiles; i++)
{
profiles[i] = SubsurfaceScatteringProfile.defaultProfile;
}
}
}
#if UNITY_EDITOR
public class SubsurfaceScatteringProfileFactory
{
[MenuItem("Assets/Create/Subsurface Scattering Profile", priority = 666)]
static void MenuCreateSubsurfaceScatteringProfile()
{
Texture2D icon = EditorGUIUtility.FindTexture("ScriptableObject Icon");
ProjectWindowUtil.StartNameEditingIfProjectWindowExists(0,
ScriptableObject.CreateInstance<DoCreateSubsurfaceScatteringProfile>(),
"New SSS Profile.asset", icon, null);
}
public static SubsurfaceScatteringProfile CreateSssProfileAtPath(string path)
{
var profile = ScriptableObject.CreateInstance<SubsurfaceScatteringProfile>();
profile.name = System.IO.Path.GetFileName(path);
AssetDatabase.CreateAsset(profile, path);
return profile;
}
}
class DoCreateSubsurfaceScatteringProfile : UnityEditor.ProjectWindowCallback.EndNameEditAction
{
public override void Action(int instanceId, string pathName, string resourceFile)
{
var profiles = SubsurfaceScatteringProfileFactory.CreateSssProfileAtPath(pathName);
ProjectWindowUtil.ShowCreatedAsset(profiles);
}
}
[CustomEditor(typeof(SubsurfaceScatteringProfile))]
public class SubsurfaceScatteringProfileEditor : Editor {
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 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 GUIStyle centeredMiniBoldLabel = new GUIStyle(GUI.skin.label);
public Styles()
{
centeredMiniBoldLabel.alignment = TextAnchor.MiddleCenter;
centeredMiniBoldLabel.fontSize = 10;
centeredMiniBoldLabel.fontStyle = FontStyle.Bold;
}
}
private static Styles styles
{
get
{
if (s_Styles == null)
{
s_Styles = new Styles();
}
return s_Styles;
}
}
private static Styles s_Styles = null;
private RenderTexture m_ProfileImage, m_TransmittanceImage;
private Material m_ProfileMaterial, m_TransmittanceMaterial;
private SerializedProperty m_Profile, m_ProfileStdDev1, m_ProfileStdDev2,
m_ProfileLerpWeight, m_ProfileTransmission,
m_ProfileThicknessRemap;
void OnEnable()
{
m_ProfileStdDev1 = serializedObject.FindProperty("stdDev1");
m_ProfileStdDev2 = serializedObject.FindProperty("stdDev2");
m_ProfileLerpWeight = serializedObject.FindProperty("lerpWeight");
m_ProfileTransmission = serializedObject.FindProperty("enableTransmission");
m_ProfileThicknessRemap = serializedObject.FindProperty("thicknessRemap");
m_ProfileMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/DrawGaussianProfile");
m_TransmittanceMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/DrawTransmittanceGraph");
m_ProfileImage = new RenderTexture(256, 256, 0, RenderTextureFormat.DefaultHDR);
m_TransmittanceImage = new RenderTexture( 16, 256, 0, RenderTextureFormat.DefaultHDR);
}
public override void OnInspectorGUI() {
serializedObject.Update();
EditorGUI.BeginChangeCheck();
{
EditorGUILayout.PropertyField(m_ProfileStdDev1, styles.sssProfileStdDev1);
EditorGUILayout.PropertyField(m_ProfileStdDev2, styles.sssProfileStdDev2);
EditorGUILayout.PropertyField(m_ProfileLerpWeight, styles.sssProfileLerpWeight);
EditorGUILayout.PropertyField(m_ProfileTransmission, styles.sssProfileTransmission);
Vector2 thicknessRemap = m_ProfileThicknessRemap.vector2Value;
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);
m_ProfileThicknessRemap.vector2Value = thicknessRemap;
EditorGUILayout.Space();
EditorGUILayout.LabelField(styles.sssProfilePreview0, styles.centeredMiniBoldLabel);
EditorGUILayout.LabelField(styles.sssProfilePreview1, EditorStyles.centeredGreyMiniLabel);
EditorGUILayout.LabelField(styles.sssProfilePreview2, EditorStyles.centeredGreyMiniLabel);
EditorGUILayout.Space();
}
// Draw the profile.
m_ProfileMaterial.SetColor("_StdDev1", m_ProfileStdDev1.colorValue);
m_ProfileMaterial.SetColor("_StdDev2", m_ProfileStdDev2.colorValue);
m_ProfileMaterial.SetFloat("_LerpWeight", m_ProfileLerpWeight.floatValue);
EditorGUI.DrawPreviewTexture(GUILayoutUtility.GetRect(256, 256), m_ProfileImage, m_ProfileMaterial, ScaleMode.ScaleToFit, 1.0f);
EditorGUILayout.Space();
EditorGUILayout.LabelField(styles.sssTransmittancePreview0, styles.centeredMiniBoldLabel);
EditorGUILayout.LabelField(styles.sssTransmittancePreview1, EditorStyles.centeredGreyMiniLabel);
EditorGUILayout.Space();
// Draw the transmittance graph.
m_TransmittanceMaterial.SetColor("_StdDev1", m_ProfileStdDev1.colorValue);
m_TransmittanceMaterial.SetColor("_StdDev2", m_ProfileStdDev2.colorValue);
m_TransmittanceMaterial.SetFloat("_LerpWeight", m_ProfileLerpWeight.floatValue);
m_TransmittanceMaterial.SetVector("_ThicknessRemap", m_ProfileThicknessRemap.vector2Value);
EditorGUI.DrawPreviewTexture(GUILayoutUtility.GetRect(16, 16), m_TransmittanceImage, m_TransmittanceMaterial, ScaleMode.ScaleToFit, 16.0f);
serializedObject.ApplyModifiedProperties();
if (EditorGUI.EndChangeCheck())
{
// Validate each individual asset and update caches.
HDRenderPipelineInstance hdPipeline = RenderPipelineManager.currentPipeline as HDRenderPipelineInstance;
hdPipeline.sssSettings.OnValidate();
}
}
}
#endif
}

12
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringProfile.cs.meta


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300
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringSettings.cs


using System;
using UnityEngine.Rendering;
#if UNITY_EDITOR
using UnityEditor;
#endif
namespace UnityEngine.Experimental.Rendering.HDPipeline
{
[Serializable]
public class SubsurfaceScatteringProfile
{
public const int numSamples = 11; // Must be an odd number
[SerializeField, ColorUsage(false, true, 0.05f, 2.0f, 1.0f, 1.0f)]
public Color stdDev1;
[SerializeField, ColorUsage(false, true, 0.05f, 2.0f, 1.0f, 1.0f)]
public Color stdDev2;
[SerializeField]
public float lerpWeight;
[SerializeField]
public bool enableTransmission;
[SerializeField]
public Vector2 thicknessRemap;
[SerializeField] [HideInInspector]
Vector4[] m_FilterKernel;
[SerializeField] [HideInInspector]
Vector3[] m_HalfRcpVariances;
[SerializeField] [HideInInspector]
Vector4 m_HalfRcpWeightedVariances;
// --- Public Methods ---
public SubsurfaceScatteringProfile()
{
stdDev1 = new Color(0.3f, 0.3f, 0.3f, 0.0f);
stdDev2 = new Color(0.6f, 0.6f, 0.6f, 0.0f);
lerpWeight = 0.5f;
enableTransmission = false;
thicknessRemap = new Vector2(0, 3);
UpdateKernelAndVarianceData();
}
public Vector4[] filterKernel
{
// Set via UpdateKernelAndVarianceData().
get { return m_FilterKernel; }
}
public Vector3[] halfRcpVariances
{
// Set via UpdateKernelAndVarianceData().
get { return m_HalfRcpVariances; }
}
public Vector4 halfRcpWeightedVariances
{
// Set via UpdateKernelAndVarianceData().
get { return m_HalfRcpWeightedVariances; }
}
public void UpdateKernelAndVarianceData()
{
if (m_FilterKernel == null || m_FilterKernel.Length != numSamples)
{
m_FilterKernel = new Vector4[numSamples];
}
if (m_HalfRcpVariances == null)
{
m_HalfRcpVariances = new Vector3[2];
}
// Our goal is to blur the image using a filter which is represented
// as a product of a linear combination of two normalized 1D Gaussians
// as suggested by Jimenez et al. in "Separable Subsurface Scattering".
// A normalized (i.e. energy-preserving) 1D Gaussian with the mean of 0
// is defined as follows: G1(x, v) = exp(-x * x / (2 * v)) / sqrt(2 * Pi * v),
// where 'v' is variance and 'x' is the radial distance from the origin.
// Using the weight 'w', our 1D and the resulting 2D filters are given as:
// A1(v1, v2, w, x) = G1(x, v1) * (1 - w) + G1(r, v2) * w,
// A2(v1, v2, w, x, y) = A1(v1, v2, w, x) * A1(v1, v2, w, y).
// The resulting filter function is a non-Gaussian PDF.
// It is separable by design, but generally not radially symmetric.
// Find the widest Gaussian across 3 color channels.
float maxStdDev1 = Mathf.Max(stdDev1.r, stdDev1.g, stdDev1.b);
float maxStdDev2 = Mathf.Max(stdDev2.r, stdDev2.g, stdDev2.b);
Vector3 weightSum = new Vector3(0, 0, 0);
// Importance sample the linear combination of two Gaussians.
for (uint i = 0; i < numSamples; i++)
{
float u = (i + 0.5f) / numSamples;
float pos = GaussianCombinationCdfInverse(u, maxStdDev1, maxStdDev2, lerpWeight);
float pdf = GaussianCombination(pos, maxStdDev1, maxStdDev2, lerpWeight);
Vector3 val;
val.x = GaussianCombination(pos, stdDev1.r, stdDev2.r, lerpWeight);
val.y = GaussianCombination(pos, stdDev1.g, stdDev2.g, lerpWeight);
val.z = GaussianCombination(pos, stdDev1.b, stdDev2.b, lerpWeight);
// We do not divide by 'numSamples' since we will renormalize, anyway.
m_FilterKernel[i].x = val.x * (1 / pdf);
m_FilterKernel[i].y = val.y * (1 / pdf);
m_FilterKernel[i].z = val.z * (1 / pdf);
m_FilterKernel[i].w = pos;
weightSum.x += m_FilterKernel[i].x;
weightSum.y += m_FilterKernel[i].y;
weightSum.z += m_FilterKernel[i].z;
}
// Renormalize the weights to conserve energy.
for (uint i = 0; i < numSamples; i++)
{
m_FilterKernel[i].x *= 1 / weightSum.x;
m_FilterKernel[i].y *= 1 / weightSum.y;
m_FilterKernel[i].z *= 1 / weightSum.z;
}
// Store (1 / (2 * Variance)) per color channel per Gaussian.
m_HalfRcpVariances[0].x = 0.5f / (stdDev1.r * stdDev1.r);
m_HalfRcpVariances[0].y = 0.5f / (stdDev1.g * stdDev1.g);
m_HalfRcpVariances[0].z = 0.5f / (stdDev1.b * stdDev1.b);
m_HalfRcpVariances[1].x = 0.5f / (stdDev2.r * stdDev2.r);
m_HalfRcpVariances[1].y = 0.5f / (stdDev2.g * stdDev2.g);
m_HalfRcpVariances[1].z = 0.5f / (stdDev2.b * stdDev2.b);
Vector4 weightedStdDev;
weightedStdDev.x = Mathf.Lerp(stdDev1.r, stdDev2.r, lerpWeight);
weightedStdDev.y = Mathf.Lerp(stdDev1.g, stdDev2.g, lerpWeight);
weightedStdDev.z = Mathf.Lerp(stdDev1.b, stdDev2.b, lerpWeight);
weightedStdDev.w = Mathf.Lerp(maxStdDev1, maxStdDev2, lerpWeight);
// Store (1 / (2 * WeightedVariance)) per color channel.
m_HalfRcpWeightedVariances.x = 0.5f / (weightedStdDev.x * weightedStdDev.x);
m_HalfRcpWeightedVariances.y = 0.5f / (weightedStdDev.y * weightedStdDev.y);
m_HalfRcpWeightedVariances.z = 0.5f / (weightedStdDev.z * weightedStdDev.z);
m_HalfRcpWeightedVariances.w = 0.5f / (weightedStdDev.w * weightedStdDev.w);
}
// --- Private Methods ---
static float Gaussian(float x, float stdDev)
{
float variance = stdDev * stdDev;
return Mathf.Exp(-x * x / (2 * variance)) / Mathf.Sqrt(2 * Mathf.PI * variance);
}
static float GaussianCombination(float x, float stdDev1, float stdDev2, float lerpWeight)
{
return Mathf.Lerp(Gaussian(x, stdDev1), Gaussian(x, stdDev2), lerpWeight);
}
static float RationalApproximation(float t)
{
// Abramowitz and Stegun formula 26.2.23.
// The absolute value of the error should be less than 4.5 e-4.
float[] c = {2.515517f, 0.802853f, 0.010328f};
float[] d = {1.432788f, 0.189269f, 0.001308f};
return t - ((c[2] * t + c[1]) * t + c[0]) / (((d[2] * t + d[1]) * t + d[0]) * t + 1.0f);
}
// Ref: https://www.johndcook.com/blog/csharp_phi_inverse/
static float NormalCdfInverse(float p, float stdDev)
{
float x;
if (p < 0.5)
{
// F^-1(p) = - G^-1(p)
x = -RationalApproximation(Mathf.Sqrt(-2.0f * Mathf.Log(p)));
}
else
{
// F^-1(p) = G^-1(1-p)
x = RationalApproximation(Mathf.Sqrt(-2.0f * Mathf.Log(1.0f - p)));
}
return x * stdDev;
}
static float GaussianCombinationCdfInverse(float p, float stdDev1, float stdDev2, float lerpWeight)
{
return Mathf.Lerp(NormalCdfInverse(p, stdDev1), NormalCdfInverse(p, stdDev2), lerpWeight);
}
}
[Serializable]
public class SubsurfaceScatteringSettings
{
public enum TexturingMode : int { PreScatter = 0, PostScatter = 1, PreAndPostScatter = 2, MaxValue = 2 };
public const int maxNumProfiles = 8;
public int numProfiles;
public TexturingMode texturingMode;
public int transmissionFlags;
public SubsurfaceScatteringProfile[] profiles;
public float[] thicknessRemaps;
public Vector4[] halfRcpVariancesAndLerpWeights;
public Vector4[] halfRcpWeightedVariances;
public Vector4[] filterKernels;
// --- Public Methods ---
public SubsurfaceScatteringSettings()
{
numProfiles = 1;
texturingMode = 0;
profiles = new SubsurfaceScatteringProfile[numProfiles];
for (int i = 0; i < numProfiles; i++)
{
profiles[i] = new SubsurfaceScatteringProfile();
}
OnValidate();
}
public void OnValidate()
{
if (profiles.Length > maxNumProfiles)
{
Array.Resize(ref profiles, maxNumProfiles);
}
numProfiles = profiles.Length;
texturingMode = (TexturingMode)Math.Max(0, Math.Min((int)texturingMode, (int)TexturingMode.MaxValue));
if (thicknessRemaps == null)
{
thicknessRemaps = new float[maxNumProfiles * 2];
}
if (halfRcpVariancesAndLerpWeights == null)
{
halfRcpVariancesAndLerpWeights = new Vector4[maxNumProfiles * 2];
}
if (halfRcpWeightedVariances == null)
{
halfRcpWeightedVariances = new Vector4[maxNumProfiles];
}
if (filterKernels == null || filterKernels.Length != (maxNumProfiles * SubsurfaceScatteringProfile.numSamples))
{
filterKernels = new Vector4[maxNumProfiles * SubsurfaceScatteringProfile.numSamples];
}
transmissionFlags = 0;
Color c = new Color();
for (int i = 0; i < numProfiles; i++)
{
transmissionFlags |= (profiles[i].enableTransmission ? 1 : 0) << i;
c.r = Mathf.Clamp(profiles[i].stdDev1.r, 0.05f, 2.0f);
c.g = Mathf.Clamp(profiles[i].stdDev1.g, 0.05f, 2.0f);
c.b = Mathf.Clamp(profiles[i].stdDev1.b, 0.05f, 2.0f);
c.a = 0.0f;
profiles[i].stdDev1 = c;
c.r = Mathf.Clamp(profiles[i].stdDev2.r, 0.05f, 2.0f);
c.g = Mathf.Clamp(profiles[i].stdDev2.g, 0.05f, 2.0f);
c.b = Mathf.Clamp(profiles[i].stdDev2.b, 0.05f, 2.0f);
c.a = 0.0f;
profiles[i].stdDev2 = c;
profiles[i].lerpWeight = Mathf.Clamp01(profiles[i].lerpWeight);
profiles[i].thicknessRemap.x = Mathf.Clamp(profiles[i].thicknessRemap.x, 0, profiles[i].thicknessRemap.y);
profiles[i].thicknessRemap.y = Mathf.Max(profiles[i].thicknessRemap.x, profiles[i].thicknessRemap.y);
profiles[i].UpdateKernelAndVarianceData();
}
// Use the updated data to fill the cache.
for (int i = 0; i < numProfiles; i++)
{
thicknessRemaps[2 * i] = profiles[i].thicknessRemap.x;
thicknessRemaps[2 * i + 1] = profiles[i].thicknessRemap.y - profiles[i].thicknessRemap.x;
halfRcpVariancesAndLerpWeights[2 * i] = profiles[i].halfRcpVariances[0];
halfRcpVariancesAndLerpWeights[2 * i].w = 1.0f - profiles[i].lerpWeight;
halfRcpVariancesAndLerpWeights[2 * i + 1] = profiles[i].halfRcpVariances[1];
halfRcpVariancesAndLerpWeights[2 * i + 1].w = profiles[i].lerpWeight;
halfRcpWeightedVariances[i] = profiles[i].halfRcpWeightedVariances;
for (int j = 0, n = SubsurfaceScatteringProfile.numSamples; j < n; j++)
{
filterKernels[n * i + j] = profiles[i].filterKernel[j];
}
}
}
}
}

8
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringSettings.cs.meta


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