Merge of #2253

commit e5e780c
Author: Elvar Örn Unnþórsson <[email protected]>
Date:   Fri Oct 16 10:53:25 2020 +0200

    Hide warnings about mismatched particle normals

    We always include vertex normals by default when building particle data, so users can switch between lit + unlit shaders without any extra config changes.
    This causes the standard particle gui to complain, but we should hide this error.

Author: phi-lira

com.unity.render-pipelines.universal/CHANGELOG.md

@@ -6,13 +6,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [11.0.0] - 2020-10-21
 
-Version Updated
-The version number for this package has increased due to a version update of a related graphics package.
-
 ### Fixed
 - Fixed an issue where soft particles were not rendered when depth texture was disabled in the URP Asset. [case 1162556](https://issuetracker.unity3d.com/issues/lwrp-unlit-particles-shader-is-not-rendered-when-soft-particles-are-enabled-on-built-application)
 - Fixed an issue where soft particles were rendered opaque on OpenGL. [case 1226288](https://issuetracker.unity3d.com/issues/urp-objects-that-are-using-soft-particles-are-rendered-opaque-when-opengl-is-used)
 - Fixed an issue where the depth texture sample node used an incorrect texture in some frames. [case 1268079](https://issuetracker.unity3d.com/issues/urp-depth-texture-sample-node-does-not-use-correct-texture-in-some-frames)
+- Removed the warning about mis-matched vertex streams when creating a default Particle System. [case 1285272](https://issuetracker.unity3d.com/issues/particles-urp-default-material-shows-warning-in-inspector)
 
 ## [10.2.0] - 2020-10-19
 

com.unity.render-pipelines.universal/Editor/ShaderGUI/ParticleGUI.cs

@@ -327,9 +327,9 @@ public static void DoVertexStreamsArea(Material material, List<ParticleSystemRen
 
                 bool streamsValid;
                 if (useGPUInstancing && renderer.renderMode == ParticleSystemRenderMode.Mesh && renderer.supportsMeshInstancing)
-                    streamsValid = rendererStreams.SequenceEqual(instancedStreams);
+                    streamsValid = CompareVertexStreams(rendererStreams, instancedStreams);
                 else
-                    streamsValid = rendererStreams.SequenceEqual(streams);
+                    streamsValid = CompareVertexStreams(rendererStreams, instancedStreams);
 
                 if (!streamsValid)
                     Warnings += "-" + renderer.name + "\n";
@@ -356,6 +356,22 @@ public static void DoVertexStreamsArea(Material material, List<ParticleSystemRen
             }
         }
 
+        private static bool CompareVertexStreams(IEnumerable<ParticleSystemVertexStream> a, IEnumerable<ParticleSystemVertexStream> b)
+        {
+            var differenceA = a.Except(b);
+            var differenceB = b.Except(a);
+            var difference = differenceA.Union(differenceB).Distinct();
+            if (!difference.Any())
+                return true;
+            // If normals are the only difference, ignore them, because the default particle streams include normals, to make it easy for users to switch between lit and unlit
+            if (difference.Count() == 1)
+            {
+                if (difference.First() == ParticleSystemVertexStream.Normal)
+                    return true;
+            }
+            return false;
+        }
+
         public static void SetMaterialKeywords(Material material)
         {
             // Setup particle + material color blending