[8.x.x Backport] Fixes for issue with Default shader and material not available when Models are imported at project startup.

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

@@ -37,6 +37,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed issue where using DOF at the same time as Dynamic Scaling, the depth buffer was sampled with incorrect UVs. [case 1225467](https://issuetracker.unity3d.com/product/unity/issues/guid/1225467/)
 - Fixed an issue where URP Simple Lit shader had attributes swapped incorrectly for BaseMap and BaseColor properties.
 - Fixed an issue where camera stacking with MSAA on OpenGL resulted in a black screen. [case 1250602](https://issuetracker.unity3d.com/issues/urp-camera-stacking-results-in-black-screen-when-msaa-and-opengl-graphics-api-are-used)
+- Fixed issue with Model Importer materials using the Legacy standard shader instead of URP's Lit shader when import happens at Editor startup.
 
 ## [8.1.0] - 2020-04-21
 

com.unity.render-pipelines.universal/Editor/AssetPostProcessors/FBXMaterialDescriptionPreprocessor.cs

@@ -1,6 +1,7 @@
 using System.IO;
 using UnityEditor.AssetImporters;
 using UnityEngine;
+using UnityEngine.Rendering.Universal;
 
 namespace UnityEditor.Rendering.Universal
 {
@@ -23,8 +24,9 @@ public void OnPreprocessMaterialDescription(MaterialDescription description, Mat
             var lowerCaseExtension = Path.GetExtension(assetPath).ToLower();
             if (lowerCaseExtension != ".fbx" && lowerCaseExtension != ".obj" && lowerCaseExtension != ".blend" && lowerCaseExtension != ".mb" && lowerCaseExtension != ".ma" && lowerCaseExtension != ".max")
                 return;
-
-            var shader = Shader.Find("Universal Render Pipeline/Lit");
+
+            string path = AssetDatabase.GUIDToAssetPath(ShaderUtils.GetShaderGUID(ShaderPathID.Lit));
+            var shader = AssetDatabase.LoadAssetAtPath<Shader>(path);
             if (shader == null)
                 return;
 

com.unity.render-pipelines.universal/Editor/AssetPostProcessors/SketchupMaterialDescriptionPostprocessor.cs

@@ -1,6 +1,7 @@
 using System.IO;
 using UnityEngine;
 using UnityEditor.AssetImporters;
+using UnityEngine.Rendering.Universal;
 
 namespace UnityEditor.Rendering.Universal
 {
@@ -25,7 +26,8 @@ public void OnPreprocessMaterialDescription(MaterialDescription description, Mat
             if (lowerCasePath != ".skp")
                 return;
 
-            var shader = Shader.Find("Universal Render Pipeline/Lit");
+            string path = AssetDatabase.GUIDToAssetPath(ShaderUtils.GetShaderGUID(ShaderPathID.Lit));
+            var shader = AssetDatabase.LoadAssetAtPath<Shader>(path);
             if (shader == null)
                 return;
             material.shader = shader;

com.unity.render-pipelines.universal/Editor/AssetPostProcessors/ThreeDSMaterialDescriptionPostprocessor.cs

@@ -2,6 +2,7 @@
 using System.IO;
 using UnityEngine;
 using UnityEditor.AssetImporters;
+using UnityEngine.Rendering.Universal;
 
 namespace UnityEditor.Rendering.Universal
 {
@@ -26,7 +27,8 @@ public void OnPreprocessMaterialDescription(MaterialDescription description, Mat
             if (lowerCasePath != ".3ds")
                 return;
 
-            var shader = Shader.Find("Universal Render Pipeline/Lit");
+            string path = AssetDatabase.GUIDToAssetPath(ShaderUtils.GetShaderGUID(ShaderPathID.Lit));
+            var shader = AssetDatabase.LoadAssetAtPath<Shader>(path);
             if (shader == null)
                 return;
             material.shader = shader;

com.unity.render-pipelines.universal/Runtime/Data/UniversalRenderPipelineAsset.cs

@@ -4,8 +4,10 @@
 using UnityEditor;
 using UnityEditor.ProjectWindowCallback;
 using System.IO;
+using UnityEditorInternal;
 #endif
 using System.ComponentModel;
+using System.Linq;
 
 namespace UnityEngine.Rendering.LWRP
 {
@@ -258,9 +260,10 @@ UniversalRenderPipelineEditorResources editorResources
             {
                 if (m_EditorResourcesAsset != null && !m_EditorResourcesAsset.Equals(null))
                     return m_EditorResourcesAsset;
-
+                
                 string resourcePath = AssetDatabase.GUIDToAssetPath(editorResourcesGUID);
-                m_EditorResourcesAsset = AssetDatabase.LoadAssetAtPath<UniversalRenderPipelineEditorResources>(resourcePath);
+                var objs = InternalEditorUtility.LoadSerializedFileAndForget(resourcePath);
+                m_EditorResourcesAsset = objs != null && objs.Length > 0 ? objs.First() as UniversalRenderPipelineEditorResources : null;
                 return m_EditorResourcesAsset;
             }
         }
@@ -687,6 +690,12 @@ public override Shader defaultShader
                     if (defaultShader != null)
                         return defaultShader;
                 }
+
+                if (m_DefaultShader == null)
+                {
+                    string path = AssetDatabase.GUIDToAssetPath(ShaderUtils.GetShaderGUID(ShaderPathID.Lit));
+                    m_DefaultShader  = AssetDatabase.LoadAssetAtPath<Shader>(path);
+                }
 #endif
 
                 if (m_DefaultShader == null)

com.unity.render-pipelines.universal/Runtime/ShaderUtils.cs

@@ -53,5 +53,31 @@ public static bool IsLWShader(Shader shader)
         {
             return s_ShaderPaths.Contains(shader.name);
         }
+
+#if UNITY_EDITOR
+        static readonly string[] s_ShaderGUIDs =
+        {
+            "933532a4fcc9baf4fa0491de14d08ed7",
+            "8d2bb70cbf9db8d4da26e15b26e74248",
+            "650dd9526735d5b46b79224bc6e94025",
+            "69c1f799e772cb6438f56c23efccb782",
+            "b7839dad95683814aa64166edc107ae2",
+            "8516d7a69675844a7a0b7095af7c46af",
+            "0406db5a14f94604a8c57ccfbc9f3b46",
+            "0ca6dca7396eb48e5849247ffd444914",
+        };
+
+        internal static string GetShaderGUID(ShaderPathID id)
+        {
+            int index = (int)id;
+            if (index < 0 && index >= (int)ShaderPathID.Count)
+            {
+                Debug.LogError("Trying to access universal shader path out of bounds");
+                return "";
+            }
+
+            return s_ShaderGUIDs[index];
+        }
+#endif
     }
 }

com.unity.render-pipelines.universal/Tests/Editor/EditorTests.cs

@@ -64,6 +64,24 @@ public void ValidateBuiltinResourceFiles()
         Assert.IsFalse(string.IsNullOrEmpty(editorResourcesPath));
     }
 
+    // Validate that ShaderUtils.GetShaderGUID results are valid and that ShaderUtils.GetShaderPath match shader names.
+    [TestCase(ShaderPathID.Lit)]
+    [TestCase(ShaderPathID.SimpleLit)]
+    [TestCase(ShaderPathID.Unlit)]
+    [TestCase(ShaderPathID.TerrainLit)]
+    [TestCase(ShaderPathID.ParticlesLit)]
+    [TestCase(ShaderPathID.ParticlesSimpleLit)]
+    [TestCase(ShaderPathID.ParticlesUnlit)]
+    [TestCase(ShaderPathID.BakedLit)]
+    public void ValidateShaderResources(ShaderPathID shaderPathID)
+    {
+        string path = AssetDatabase.GUIDToAssetPath(ShaderUtils.GetShaderGUID(shaderPathID));
+        Assert.IsFalse(string.IsNullOrEmpty(path));
+
+        var shader = AssetDatabase.LoadAssetAtPath<Shader>(path);
+        Assert.AreEqual(shader.name, ShaderUtils.GetShaderPath(shaderPathID));
+    }
+
     // When creating URP all required resources should be initialized.
     [Test]
     public void ValidateNewAssetResources()