Merge pull request #511 from Unity-Technologies/feature/refractionthickness

Feature/refractionthickness

SampleScenes/HDTest/GraphicTest/Common/Material/Mat_refraction_sphere_EarthMap_pretransparent.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Mat_refraction_thicksphere_EarthMap_pretransparent
+  m_Name: Mat_refraction_sphere_EarthMap_pretransparent
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
   m_ShaderKeywords: _BLENDMODE_ALPHA _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _ENABLE_FOG_ON_TRANSPARENT
     _MASKMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKSPHERE _SURFACE_TYPE_TRANSPARENT
-  m_CustomRenderQueue: 3000
+  m_CustomRenderQueue: 2750
   stringTagMap:
     RenderType: Transparent
   disabledShaderPasses:
     - _PPDPrimitiveWidth: 1
     - _Parallax: 0.02
     - _PerPixelDisplacementObjectScale: 1
-    - _PreRefractionPass: 0
+    - _PreRefractionPass: 1
     - _PreTransparentPass: 1
     - _RefractionAbsorptionEnable: 0
     - _RefractionEnable: 0
     - _ZTestMode: 8
     - _ZWrite: 0
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 0}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 0.078431375}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

SampleScenes/HDTest/GraphicTest/Common/Material/Mat_refraction_sphere_EarthMap_RefractionMask.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Mat_refraction_thicksphere_EarthMap_RefractionMask
+  m_Name: Mat_refraction_sphere_EarthMap_RefractionMask
-    _MASKMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKSPHERE _SURFACE_TYPE_TRANSPARENT
+    _MASKMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_SPHERE _REFRACTION_THICKSPHERE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _ZTestMode: 8
     - _ZWrite: 0
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 0.047}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

SampleScenes/HDTest/GraphicTest/Common/Material/Mat_refraction_sphere_EarthMap.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Mat_refraction_thicksphere_EarthMap
+  m_Name: Mat_refraction_sphere_EarthMap
-    _MASKMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKSPHERE _SURFACE_TYPE_TRANSPARENT
+    _MASKMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_SPHERE _REFRACTION_THICKSPHERE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _ZTestMode: 8
     - _ZWrite: 0
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 0}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

SampleScenes/HDTest/GraphicTest/Common/Material/Mat_refraction_sphere_Dragon.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Mat_refraction_thicksphere_Dragon
+  m_Name: Mat_refraction_sphere_Dragon
-    _HEIGHTMAP _MASKMAP _NORMALMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKSPHERE
+    _HEIGHTMAP _MASKMAP _NORMALMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_SPHERE _REFRACTION_THICKSPHERE
     _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
     - _ZTestMode: 8
     - _ZWrite: 0
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 0}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

SampleScenes/HDTest/GraphicTest/Common/Material/Mat_refraction_sphere_Clear_ior15.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Mat_refraction_thicksphere_Clear_ior15
+  m_Name: Mat_refraction_sphere_Clear_ior15
-    _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKSPHERE _SURFACE_TYPE_TRANSPARENT
+    _NORMALMAP_TANGENT_SPACE _REFRACTION_SPHERE _REFRACTION_THICKSPHERE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _ZTestMode: 8
     - _ZWrite: 0
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 0}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

SampleScenes/HDTest/GraphicTest/Common/Material/Mat_refraction_sphere_Clear_ior101.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Mat_refraction_thicksphere_Clear_ior101
+  m_Name: Mat_refraction_sphere_Clear_ior101
-    _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKSPHERE _SURFACE_TYPE_TRANSPARENT
+    _NORMALMAP_TANGENT_SPACE _REFRACTION_SPHERE _REFRACTION_THICKSPHERE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _ZTestMode: 8
     - _ZWrite: 0
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 0}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

SampleScenes/HDTest/GraphicTest/Common/Material/Mat_refraction_plane_EarthMap.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Mat_refraction_thickplane_EarthMap
+  m_Name: Mat_refraction_plane_EarthMap
-    _MASKMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKPLANE _SURFACE_TYPE_TRANSPARENT
+    _MASKMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_PLANE _REFRACTION_THICKPLANE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _ZTestMode: 8
     - _ZWrite: 0
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 0}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

SampleScenes/HDTest/GraphicTest/Common/Material/Mat_refraction_plane_Dragon.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Mat_refraction_thickplane_Dragon
+  m_Name: Mat_refraction_plane_Dragon
-    _HEIGHTMAP _MASKMAP _NORMALMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKPLANE
+    _HEIGHTMAP _MASKMAP _NORMALMAP _NORMALMAP_TANGENT_SPACE _REFRACTION_PLANE _REFRACTION_THICKPLANE
     _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
     - _ZTestMode: 8
     - _ZWrite: 0
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 0}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

SampleScenes/HDTest/GraphicTest/Common/Material/Mat_refraction_plane_Clear_ior15.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Mat_refraction_thickplane_Clear_ior15
+  m_Name: Mat_refraction_plane_Clear_ior15
-    _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKPLANE _SURFACE_TYPE_TRANSPARENT
+    _NORMALMAP_TANGENT_SPACE _REFRACTION_PLANE _REFRACTION_THICKPLANE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _ZTestMode: 8
     - _ZWrite: 0
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 0}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

SampleScenes/HDTest/GraphicTest/Common/Material/Mat_refraction_plane_Clear_ior101.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Mat_refraction_thickplane_Clear_ior101
+  m_Name: Mat_refraction_plane_Clear_ior101
-    _NORMALMAP_TANGENT_SPACE _REFRACTION_THICKPLANE _SURFACE_TYPE_TRANSPARENT
+    _NORMALMAP_TANGENT_SPACE _REFRACTION_PLANE _REFRACTION_THICKPLANE _SURFACE_TYPE_TRANSPARENT
   m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _ZTestMode: 8
     - _ZWrite: 0
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 0}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Sphere Sphere Map Earth.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickSphere Sphere Map Earth
+  m_Name: Refraction Sphere Sphere Map Earth
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Sphere Sphere Map Earth - PreTransparent.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickSphere Sphere Map Earth - PreTransparent
+  m_Name: Refraction Sphere Sphere Map Earth - PreTransparent
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Sphere Sphere Clear.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickSphere Sphere Clear
+  m_Name: Refraction Sphere Sphere Clear
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Sphere Mapped Dragon.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickSphere Mapped Dragon
+  m_Name: Refraction Sphere Mapped Dragon
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Sphere Cube Clear.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickSphere Cube Clear
+  m_Name: Refraction Sphere Cube Clear
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Sphere Clear Dragon.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickSphere Clear Dragon
+  m_Name: Refraction Sphere Clear Dragon
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Plane Sphere Map Earth.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickPlane Sphere Map Earth
+  m_Name: Refraction Plane Sphere Map Earth
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Plane Sphere Clear.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickPlane Sphere Clear
+  m_Name: Refraction Plane Sphere Clear
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Plane Mapped Dragon.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickPlane Mapped Dragon
+  m_Name: Refraction Plane Mapped Dragon
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Plane Cube Clear.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickPlane Cube Clear
+  m_Name: Refraction Plane Cube Clear
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction Plane Clear Dragon.prefab

   - component: {fileID: 33235095751850106}
   - component: {fileID: 23359103481084912}
   m_Layer: 0
-  m_Name: Refraction ThickPlane Clear Dragon
+  m_Name: Refraction Plane Clear Dragon
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0

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

 
                         blendMode.floatValue = (float)BlendMode.Alpha;
 
-                        if (mode != Lit.RefractionMode.ThinPlane)
-                        {
-                            if (thicknessMap[0].textureValue == null)
-                                m_MaterialEditor.ShaderProperty(thickness[0], Styles.refractionThicknessText);
-                            m_MaterialEditor.TexturePropertySingleLine(Styles.refractionThicknessMapText, thicknessMap[0]);
+                        if (thicknessMap[0].textureValue == null)
+                            m_MaterialEditor.ShaderProperty(thickness[0], Styles.refractionThicknessText);
+                        m_MaterialEditor.TexturePropertySingleLine(Styles.refractionThicknessMapText, thicknessMap[0]);
-                            ++EditorGUI.indentLevel;
-                            m_MaterialEditor.ShaderProperty(thicknessMultiplier, Styles.refractionThicknessMultiplierText);
-                            --EditorGUI.indentLevel;
-                        }
+                        ++EditorGUI.indentLevel;
+                        m_MaterialEditor.ShaderProperty(thicknessMultiplier, Styles.refractionThicknessMultiplierText);
+                        --EditorGUI.indentLevel;
 
                         m_MaterialEditor.ShaderProperty(transmittanceColor, Styles.transmittanceColorText);
                         ++EditorGUI.indentLevel;
             var refractionModeValue = (Lit.RefractionMode)material.GetFloat(kRefractionMode);
             // We can't have refraction in pre-refraction queue
             var canHaveRefraction = !material.HasProperty(kPreRefractionPass) || material.GetFloat(kPreRefractionPass) <= 0.0;
-            SetKeyword(material, "_REFRACTION_THINPLANE", (refractionModeValue == Lit.RefractionMode.ThinPlane) && canHaveRefraction);
-            SetKeyword(material, "_REFRACTION_THICKPLANE", (refractionModeValue == Lit.RefractionMode.ThickPlane) && canHaveRefraction);
-            SetKeyword(material, "_REFRACTION_THICKSPHERE", (refractionModeValue == Lit.RefractionMode.ThickSphere) && canHaveRefraction);
+            SetKeyword(material, "_REFRACTION_PLANE", (refractionModeValue == Lit.RefractionMode.Plane) && canHaveRefraction);
+            SetKeyword(material, "_REFRACTION_SPHERE", (refractionModeValue == Lit.RefractionMode.Sphere) && canHaveRefraction);
         }
     }
 } // namespace UnityEditor

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.cs

         public enum RefractionMode
         {
             None = 0,
-            ThickPlane = 1,
-            ThickSphere = 2,
-            ThinPlane = 3
+            Plane = 1,
+            Sphere = 2
         };
 
         //-----------------------------------------------------------------------------

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

 #endif
 
 // Define refraction keyword helpers
-#define HAS_REFRACTION (defined(_REFRACTION_THINPLANE) || defined(_REFRACTION_THICKPLANE) || defined(_REFRACTION_THICKSPHERE))
+#define HAS_REFRACTION (defined(_REFRACTION_PLANE) || defined(_REFRACTION_SPHERE))
 
 // In case we pack data uint16 buffer we need to change the output render target format to uint16
 // TODO: Is there a way to automate these output type based on the format declare in lit.cs ?
     bsdfData.ior = ior;
     // Absorption coefficient from Disney: http://blog.selfshadow.com/publications/s2015-shading-course/burley/s2015_pbs_disney_bsdf_notes.pdf
     bsdfData.absorptionCoefficient = -log(transmittanceColor + 0.00001) / max(atDistance, 0.000001);
-#if defined(_REFRACTION_THINPLANE)
-    bsdfData.thickness = 0.03;
-#else
-    bsdfData.thickness = max(0.000001, thickness);
-#endif
+    bsdfData.thickness = max(thickness, 0.0001);
 }
 
 // For image based lighting, a part of the BSDF is pre-integrated.
     // For all refraction approximation, to calculate the refracted point in world space,
     //   we approximate the scene as a plane (back plane) with normal -V at the depth hit point.
     //   (We avoid to raymarch the depth texture to get the refracted point.)
-#if defined(_REFRACTION_THICKPLANE)
-    // Thick plane shape model:
-    //  We approximate locally the shape of the object as halfspace defined by the normal {bsdfData.normallWS} at {bsdfData.positionWS}
-    //  Thus, the light is refracted once.
-    //  It approximate cubic filled shapes
-    //
-    // However, we can't approximate the optical depth of the object, so we use a constant as parameter ({bsdfData.thickness})
+#if defined(_REFRACTION_PLANE)
+    // Plane shape model: 
+    //  We approximate locally the shape of the object as a plane with normal {bsdfData.normalWS} at {bsdfData.positionWS} 
+    //  with a thickness {bsdfData.thickness} 
-    // Refracted ray
+    // Refracted ray 
-    // Get the depth of the approximated back plane
+    // Get the depth of the approximated back plane 
-    // Distance from point to the back plane
+    // Distance from point to the back plane 
+    // Optical depth within the thin plane 
+    opticalDepth = bsdfData.thickness / dot(R, -bsdfData.normalWS);
+
+    // The refracted ray exiting the thin plane is the same as the incident ray (parallel interfaces and same ior) 
-    refractedBackPointWS = posInput.positionWS + R * distFromP / VoR;
-    opticalDepth = bsdfData.thickness;
+    float VoN = dot(V, bsdfData.normalWS);
+    refractedBackPointWS = posInput.positionWS + R * opticalDepth - V * (distFromP - VoR * opticalDepth);
-#elif defined(_REFRACTION_THICKSPHERE)
-    // Thick sphere shape model:
+#elif defined(_REFRACTION_SPHERE)
+    // Sphere shape model:
     //  We approximate locally the shape of the object as sphere, that is tangent to the shape.
     //  The sphere has a diameter of {bsdfData.thickness}
     //  The center of the sphere is at {bsdfData.positionWS} - {bsdfData.normalWS} * {bsdfData.thickness}
     // Refracted source point
     refractedBackPointWS = P1 - R2 * (depthFromPosition - NoR1 * VoR1 * bsdfData.thickness) / N1oR2;
 
-#elif defined(_REFRACTION_THINPLANE)
-    // Thin plane shape model:
-    //  We approximate locally the shape of the object as a plane with normal {bsdfData.normalWS} at {bsdfData.positionWS}
-    //  with a thickness {bsdfData.thickness}
-
-    // Refracted ray
-    float3 R = refract(-V, bsdfData.normalWS, 1.0 / bsdfData.ior);
-
-    // Get the depth of the approximated back plane
-    float pyramidDepth = LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, posInput.positionSS * (depthSize >> 2), 2).r;
-    float depth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
-
-    // Distance from point to the back plane
-    float distFromP = depth - posInput.depthVS;
-
-    // Optical depth within the thin plane
-    opticalDepth = bsdfData.thickness / dot(R, -bsdfData.normalWS);
-
-    // The refracted ray exiting the thin plane is the same as the incident ray (parallel interfaces and same ior)
-    float VoR = dot(-V, R);
-    float VoN = dot(V, bsdfData.normalWS);
-    refractedBackPointWS = posInput.positionWS + R * opticalDepth - V * (distFromP - VoR * opticalDepth);
 #endif
 
     // Calculate screen space coordinates of refracted point in back plane

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

         _AlphaCutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5
 
         // Transparency
-        [Enum(None, 0, ThickPlane, 1, ThickSphere, 2, ThinPlane, 3)]_RefractionMode("Refraction Mode", Int) = 0
+        [Enum(None, 0, Plane, 1, Sphere, 2)]_RefractionMode("Refraction Mode", Int) = 0
         _IOR("Indice Of Refraction", Range(1.0, 2.5)) = 1.0
         _ThicknessMultiplier("Thickness Multiplier", Float) = 1.0
         _TransmittanceColor("Transmittance Color", Color) = (1.0, 1.0, 1.0)
     #pragma shader_feature _DISPLACEMENT_LOCK_TILING_SCALE
     #pragma shader_feature _PIXEL_DISPLACEMENT_LOCK_OBJECT_SCALE
     #pragma shader_feature _VERTEX_WIND
-    #pragma shader_feature _ _REFRACTION_THINPLANE _REFRACTION_THICKPLANE _REFRACTION_THICKSPHERE
+    #pragma shader_feature _ _REFRACTION_PLANE _REFRACTION_SPHERE
 
     #pragma shader_feature _ _MAPPING_PLANAR _MAPPING_TRIPLANAR
     #pragma shader_feature _NORMALMAP_TANGENT_SPACE

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader

         _AlphaCutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5
 
         // Transparency
-        [Enum(None, 0, ThickPlane, 1, ThickSphere, 2, ThinPlane, 3)]_RefractionMode("Refraction Mode", Int) = 0
+        [Enum(None, 0, Plane, 1, Sphere, 2)]_RefractionMode("Refraction Mode", Int) = 0
         _IOR("Indice Of Refraction", Range(1.0, 2.5)) = 1.0
         _ThicknessMultiplier("Thickness Multiplier", Float) = 1.0
         _TransmittanceColor("Transmittance Color", Color) = (1.0, 1.0, 1.0)
     #pragma shader_feature _PIXEL_DISPLACEMENT_LOCK_OBJECT_SCALE
     #pragma shader_feature _VERTEX_WIND
     #pragma shader_feature _ _TESSELLATION_PHONG
-    #pragma shader_feature _ _REFRACTION_THINPLANE _REFRACTION_THICKPLANE _REFRACTION_THICKSPHERE
+    #pragma shader_feature _ _REFRACTION_PLANE _REFRACTION_SPHERE
 
     #pragma shader_feature _ _MAPPING_PLANAR _MAPPING_TRIPLANAR
     #pragma shader_feature _NORMALMAP_TANGENT_SPACE

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SampleScenes/HDTest/GraphicTest/Common/Prefabs/Refraction ThinPlane Clear Dragon.prefab

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