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Replace the standard deviation with the scatter distance in centimeters

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Evgenii Golubev 7 年前
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8f41c126
共有 2 个文件被更改，包括 51 次插入 和 45 次删除
  1. 8
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl
  2. 88
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringProfile.cs

8
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl
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// SSS parameters
#define SSS_N_PROFILES 8
#define SSS_UNIT_CONVERSION (1.0 / 300.0) // From 1/3 centimeters to meters
#define SSS_LOW_THICKNESS 0.005 // 0.5 cm
#define CENTIMETERS_TO_METERS (1.0 / 100.0)

// TODO take from subsurfaceProfile
bsdfData.fresnel0 = 0.04; // Should be 0.028 for the skin
bsdfData.subsurfaceProfile = subsurfaceProfile;
// Make the Std. Dev. of 1 correspond to the effective radius of 1 cm (three-sigma rule).
bsdfData.subsurfaceRadius = SSS_UNIT_CONVERSION * subsurfaceRadius + 0.0001;
bsdfData.thickness = CENTIMETERS_TO_METERS * (_ThicknessRemaps[subsurfaceProfile][0] +
_ThicknessRemaps[subsurfaceProfile][1] * thickness);
bsdfData.subsurfaceRadius = CENTIMETERS_TO_METERS * subsurfaceRadius + 0.0001;
bsdfData.thickness = CENTIMETERS_TO_METERS * (_ThicknessRemaps[subsurfaceProfile][0] +
_ThicknessRemaps[subsurfaceProfile][1] * thickness);
bsdfData.enableTransmission = IsBitSet(_TransmissionFlags, subsurfaceProfile);
if (bsdfData.enableTransmission)

88
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringProfile.cs
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public const int numSamples = 11; // Must be an odd number
[ColorUsage(false, true, 0.05f, 2.0f, 1.0f, 1.0f)]
public Color stdDev1;
public Color scatterDistance1;
public Color stdDev2;
public Color scatterDistance2;
public float lerpWeight;
public TexturingMode texturingMode;
public bool enableTransmission;

public SubsurfaceScatteringProfile()
{
stdDev1 = new Color(0.3f, 0.3f, 0.3f, 0.0f);
stdDev2 = new Color(0.6f, 0.6f, 0.6f, 0.0f);
scatterDistance1 = new Color(0.3f, 0.3f, 0.3f, 0.0f);
scatterDistance2 = new Color(0.6f, 0.6f, 0.6f, 0.0f);
lerpWeight = 0.5f;
texturingMode = TexturingMode.PreAndPostScatter;
enableTransmission = false;

{
m_HalfRcpVariances = new Vector3[2];
}
// Apply the three-sigma rule.
Color stdDev1 = scatterDistance1 * (1.0f / 3.0f);
Color stdDev2 = scatterDistance2 * (1.0f / 3.0f);
// 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

// Skip unassigned profiles.
if (profiles[i] == null) continue;
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.r = Mathf.Clamp(profiles[i].scatterDistance1.r, 0.05f, 2.0f);
c.g = Mathf.Clamp(profiles[i].scatterDistance1.g, 0.05f, 2.0f);
c.b = Mathf.Clamp(profiles[i].scatterDistance1.b, 0.05f, 2.0f);
profiles[i].stdDev1 = c;
profiles[i].scatterDistance1 = 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.r = Mathf.Clamp(profiles[i].scatterDistance2.r, 0.05f, 2.0f);
c.g = Mathf.Clamp(profiles[i].scatterDistance2.g, 0.05f, 2.0f);
c.b = Mathf.Clamp(profiles[i].scatterDistance2.b, 0.05f, 2.0f);
profiles[i].stdDev2 = c;
profiles[i].scatterDistance2 = c;
profiles[i].lerpWeight = Mathf.Clamp01(profiles[i].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 the 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 for thickness values from the remap.");
public readonly GUIContent sssTransmittancePreview2 = new GUIContent("Can be thought of as a cross section of a slab of material illuminated by a white light from the left.");
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 the 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 for thickness values from the remap.");
public readonly GUIContent sssTransmittancePreview2 = new GUIContent("Can be thought of as a cross section of a slab of material illuminated by a white light from the left.");
public readonly GUIContent sssProfileScatterDistance1 = new GUIContent("Scatter Distance #1", "The radius (in centimeters) of the 1st Gaussian filter, one per color channel. Alpha is ignored. The blur is energy-preserving, so a wide filter results in a large area with small contributions of individual samples. Smaller values increase the sharpness.");
public readonly GUIContent sssProfileScatterDistance2 = new GUIContent("Scatter Distance #2", "The radius (in centimeters) of the 2nd Gaussian filter, one per color channel. Alpha is ignored. The blur is energy-preserving, so a wide filter results in a large area with small contributions of individual samples. Smaller values increase the sharpness.");
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]
{
new GUIContent("Pre- and post-scatter", "Texturing is performed during both the lighting and the SSS passes. Slightly blurs the diffuse texture. Choose this mode if your diffuse texture contains little to no SSS lighting."),
new GUIContent("Post-scatter", "Texturing is performed only during the SSS pass. Effectively preserves the sharpness of the diffuse texture. Choose this mode if your diffuse texture already contains SSS lighting (e.g. a photo of skin).")

private RenderTexture m_ProfileImage, m_TransmittanceImage;
private Material m_ProfileMaterial, m_TransmittanceMaterial;
private SerializedProperty m_StdDev1, m_StdDev2, m_LerpWeight, m_TintColor,
private SerializedProperty m_ScatterDistance1, m_ScatterDistance2, m_LerpWeight, m_TintColor,
m_StdDev1 = serializedObject.FindProperty("stdDev1");
m_StdDev2 = serializedObject.FindProperty("stdDev2");
m_LerpWeight = serializedObject.FindProperty("lerpWeight");
m_TexturingMode = serializedObject.FindProperty("texturingMode");
m_Transmission = serializedObject.FindProperty("enableTransmission");
m_TintColor = serializedObject.FindProperty("tintColor");
m_ThicknessRemap = serializedObject.FindProperty("thicknessRemap");
m_ScatterDistance1 = serializedObject.FindProperty("scatterDistance1");
m_ScatterDistance2 = serializedObject.FindProperty("scatterDistance2");
m_LerpWeight = serializedObject.FindProperty("lerpWeight");
m_TexturingMode = serializedObject.FindProperty("texturingMode");
m_Transmission = serializedObject.FindProperty("enableTransmission");
m_TintColor = serializedObject.FindProperty("tintColor");
m_ThicknessRemap = serializedObject.FindProperty("thicknessRemap");
m_ProfileMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/DrawGaussianProfile");
m_TransmittanceMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/DrawTransmittanceGraph");

EditorGUI.BeginChangeCheck();
{
EditorGUILayout.PropertyField(m_StdDev1, styles.sssProfileStdDev1);
EditorGUILayout.PropertyField(m_StdDev2, styles.sssProfileStdDev2);
EditorGUILayout.PropertyField(m_LerpWeight, styles.sssProfileLerpWeight);
EditorGUILayout.PropertyField(m_ScatterDistance1, styles.sssProfileScatterDistance1);
EditorGUILayout.PropertyField(m_ScatterDistance2, styles.sssProfileScatterDistance2);
EditorGUILayout.PropertyField(m_LerpWeight, styles.sssProfileLerpWeight);
EditorGUILayout.PropertyField(m_Transmission, styles.sssProfileTransmission);
EditorGUILayout.PropertyField(m_TintColor, styles.sssProfileTintColor);
EditorGUILayout.PropertyField(m_Transmission, styles.sssProfileTransmission);
EditorGUILayout.PropertyField(m_TintColor, styles.sssProfileTintColor);
EditorGUILayout.PropertyField(m_ThicknessRemap, styles.sssProfileMinMaxThickness);
Vector2 thicknessRemap = m_ThicknessRemap.vector2Value;

EditorGUILayout.Space();
}
// Apply the three-sigma rule.
Color stdDev1 = m_ScatterDistance1.colorValue * (1.0f / 3.0f);
Color stdDev2 = m_ScatterDistance2.colorValue * (1.0f / 3.0f);
m_ProfileMaterial.SetColor("_StdDev1", m_StdDev1.colorValue);
m_ProfileMaterial.SetColor("_StdDev2", m_StdDev2.colorValue);
m_ProfileMaterial.SetColor("_StdDev1", stdDev1);
m_ProfileMaterial.SetColor("_StdDev2", stdDev2);
m_ProfileMaterial.SetFloat("_LerpWeight", m_LerpWeight.floatValue);
EditorGUI.DrawPreviewTexture(GUILayoutUtility.GetRect(256, 256), m_ProfileImage, m_ProfileMaterial, ScaleMode.ScaleToFit, 1.0f);

EditorGUILayout.Space();
// Draw the transmittance graph.
m_TransmittanceMaterial.SetColor("_StdDev1", m_StdDev1.colorValue);
m_TransmittanceMaterial.SetColor("_StdDev2", m_StdDev2.colorValue);
m_TransmittanceMaterial.SetColor("_StdDev1", stdDev1);
m_TransmittanceMaterial.SetColor("_StdDev2", stdDev2);
m_TransmittanceMaterial.SetFloat("_LerpWeight", m_LerpWeight.floatValue);
m_TransmittanceMaterial.SetVector("_ThicknessRemap", m_ThicknessRemap.vector2Value);
m_TransmittanceMaterial.SetVector("_TintColor", m_TintColor.colorValue);

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