Make work with astra

UnityProject/Assets/ThirdParty/PostProcessing/Runtime/Models/DitheringModel.cs

@@ -0,0 +1,30 @@
+using System;
+
+namespace UnityEngine.PostProcessing
+{
+    [Serializable]
+    public class DitheringModel : PostProcessingModel
+    {
+        [Serializable]
+        public struct Settings
+        {
+            public static Settings defaultSettings
+            {
+                get { return new Settings(); }
+            }
+        }
+
+        [SerializeField]
+        Settings m_Settings = Settings.defaultSettings;
+        public Settings settings
+        {
+            get { return m_Settings; }
+            set { m_Settings = value; }
+        }
+
+        public override void Reset()
+        {
+            m_Settings = Settings.defaultSettings;
+        }
+    }
+}