Renamed ScreenSpaceRefraction volume

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Lighting/Reflection/ScreenSpaceRefractionEditor.cs

 namespace UnityEngine.Experimental.Rendering.HDPipeline
 {
     [CanEditMultipleObjects]
-    [VolumeComponentEditor(typeof(ScreenSpaceRefractionVolume))]
-    public class ScreenSpaceRefractionVolumeEditor : VolumeComponentEditor
+    [VolumeComponentEditor(typeof(ScreenSpaceRefraction))]
+    public class ScreenSpaceRefractionEditor : VolumeComponentEditor
     {
         SerializedDataParameter m_RayMinLevel;
         SerializedDataParameter m_RayMaxLevel;
 
         public override void OnEnable()
         {
-            var o = new PropertyFetcher<ScreenSpaceRefractionVolume>(serializedObject);
+            var o = new PropertyFetcher<ScreenSpaceRefraction>(serializedObject);
 
             m_RayMinLevel = Unpack(o.Find(x => x.rayMinLevel));
             m_RayMaxLevel = Unpack(o.Find(x => x.rayMaxLevel));

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipeline.cs

 
                 m_VolumetricLightingSystem.PushGlobalParams(hdCamera, cmd);
 
-                var ssrefraction = VolumeManager.instance.stack.GetComponent<ScreenSpaceRefractionVolume>();
-                if (ssrefraction != null)
-                    ssrefraction.PushShaderParameters(cmd);
+                var ssrefraction = VolumeManager.instance.stack.GetComponent<ScreenSpaceRefraction>()
+                    ?? ScreenSpaceRefraction.@default;
+                ssrefraction.PushShaderParameters(cmd);
             }
         }
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/Reflection/ScreenSpaceRefraction.cs

+using System;
+using UnityEngine.Rendering;
+
+namespace UnityEngine.Experimental.Rendering.HDPipeline
+{
+    [Serializable]
+    public class ScreenSpaceRefraction : VolumeComponent
+    {
+        static ScreenSpaceRefraction s_Default = null;
+        public static ScreenSpaceRefraction @default
+        {
+            get
+            {
+                if (s_Default == null)
+                {
+                    s_Default = ScriptableObject.CreateInstance<ScreenSpaceRefraction>();
+                    s_Default.hideFlags = HideFlags.HideAndDontSave;
+                }
+                return s_Default;
+            }
+        }
+
+        public IntParameter                 rayMinLevel = new IntParameter(2);
+        public IntParameter                 rayMaxLevel = new IntParameter(6);
+        public IntParameter                 rayMaxIterations = new IntParameter(32);
+        public FloatParameter               rayDepthSuccessBias = new FloatParameter(0.1f);
+        public ClampedFloatParameter        screenWeightDistance = new ClampedFloatParameter(0.1f, 0, 1);
+
+        public void PushShaderParameters(CommandBuffer cmd)
+        {
+            cmd.SetGlobalInt(HDShaderIDs._SSRefractionRayMinLevel, rayMinLevel.value);
+            cmd.SetGlobalInt(HDShaderIDs._SSRefractionRayMaxLevel, rayMaxLevel.value);
+            cmd.SetGlobalInt(HDShaderIDs._SSRefractionRayMaxIterations, rayMaxIterations.value);
+            cmd.SetGlobalFloat(HDShaderIDs._SSRefractionRayDepthSuccessBias, rayDepthSuccessBias.value);
+            cmd.SetGlobalFloat(HDShaderIDs._SSRefractionInvScreenWeightDistance, 1f / screenWeightDistance.value);
+        }
+    }
+}

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/Reflection/ScreenSpaceRefractionVolume.cs

-using System;
-using UnityEngine.Rendering;
-
-namespace UnityEngine.Experimental.Rendering.HDPipeline
-{
-    [Serializable]
-    public class ScreenSpaceRefractionVolume : VolumeComponent
-    {
-        public IntParameter                 rayMinLevel = new IntParameter(2);
-        public IntParameter                 rayMaxLevel = new IntParameter(6);
-        public IntParameter                 rayMaxIterations = new IntParameter(32);
-        public FloatParameter               rayDepthSuccessBias = new FloatParameter(0.1f);
-        public ClampedFloatParameter        screenWeightDistance = new ClampedFloatParameter(0.1f, 0, 1);
-
-        public void PushShaderParameters(CommandBuffer cmd)
-        {
-            cmd.SetGlobalInt(HDShaderIDs._SSRefractionRayMinLevel, rayMinLevel.value);
-            cmd.SetGlobalInt(HDShaderIDs._SSRefractionRayMaxLevel, rayMaxLevel.value);
-            cmd.SetGlobalInt(HDShaderIDs._SSRefractionRayMaxIterations, rayMaxIterations.value);
-            cmd.SetGlobalFloat(HDShaderIDs._SSRefractionRayDepthSuccessBias, rayDepthSuccessBias.value);
-            cmd.SetGlobalFloat(HDShaderIDs._SSRefractionInvScreenWeightDistance, 1f / screenWeightDistance.value);
-        }
-    }
-}