[USDU-230][USDU-232][USDU-275] Add testcases regarding texture mapping

package/com.unity.formats.usd/Tests/Common/BaseFixture.cs

@@ -29,6 +29,8 @@ public abstract class BaseFixture
         protected string ArtifactsDirectoryName => "Artifacts";
         protected string ArtifactsDirectoryFullPath => Path.Combine(Application.dataPath, ArtifactsDirectoryName);
         protected string ArtifactsDirectoryRelativePath => Path.Combine("Assets", ArtifactsDirectoryName);
+        protected string TestAssetDirectoryName => TestAssetData.Directory.FolderName;
+        protected string TestUsdAssetDirectoryRelativePath => Path.Combine("Packages", "com.unity.formats.usd", "Tests", "Common", "Data", TestAssetDirectoryName);
 
         public string GetUnityScenePath(string sceneName = null)
         {
@@ -60,7 +62,7 @@ public string GetUSDScenePath(string usdFileName = null)
             return Path.Combine(ArtifactsDirectoryFullPath, usdFileName);
         }
 
-        public string GetPrefabPath(string prefabName = null)
+        public string GetPrefabPath(string prefabName = null, bool resource = false)
         {
             if (string.IsNullOrEmpty(prefabName))
             {
@@ -72,7 +74,16 @@ public string GetPrefabPath(string prefabName = null)
                 prefabName += ".prefab";
             }
 
-            return Path.Combine(ArtifactsDirectoryRelativePath, prefabName);
+            return Path.Combine(ArtifactsDirectoryRelativePath, resource ? "Resources" : "", prefabName);
+        }
+
+        public string GetTestAssetPath(string fileName)
+        {
+            if (!fileName.EndsWith(TestAssetData.Extension.Usda))
+            {
+                fileName += TestAssetData.Extension.Usda;
+            }
+            return Path.GetFullPath(Path.Combine(TestUsdAssetDirectoryRelativePath, fileName));
         }
 
         public string CreateTmpUsdFile(string fileName = "tempUsd.usda")
@@ -117,14 +128,28 @@ public void CleanupTestArtifacts()
                 Directory.Delete(ArtifactsDirectoryFullPath, true);
             }
 
-            if (File.Exists(ArtifactsDirectoryFullPath.TrimEnd('/') + ".meta"))
+            DeleteMetaFile(ArtifactsDirectoryFullPath);
+
+#if UNITY_EDITOR
+            // TODO: If materialImportMode = MaterialImportMode.ImportPreviewSurface, it creates all the texture2d files on the root assets
+            // Figure out if the texture2ds can be set into a different location - such as our artifacts directory
+            foreach (var textureArtifactGUID in AssetDatabase.FindAssets("t:texture2D", new string[] { "Assets" }))
             {
-                File.Delete(ArtifactsDirectoryFullPath.TrimEnd('/') + ".meta");
+                var textureFilePath = Path.GetFullPath(AssetDatabase.GUIDToAssetPath(textureArtifactGUID));
+                File.Delete(textureFilePath);
+                DeleteMetaFile(textureFilePath);
             }
 
-#if UNITY_EDITOR
             AssetDatabase.Refresh();
 #endif
         }
+
+        private void DeleteMetaFile(string fullPath)
+        {
+            if (File.Exists(fullPath.TrimEnd('/') + ".meta"))
+            {
+                File.Delete(fullPath.TrimEnd('/') + ".meta");
+            }
+        }
     }
 }

package/com.unity.formats.usd/Tests/Common/CustomAsserts/ImportAssert.cs

@@ -0,0 +1,118 @@
+using UnityEngine;
+using NUnit.Framework;
+
+namespace Unity.Formats.USD.Tests
+{
+    public static class ImportAssert
+    {
+        public static class Editor
+        {
+            enum ObjectTypeName
+            {
+                UsdPlayableAsset = 0,
+                GameObject = 1,
+                Material = 2,
+                UsdPrimSource = 3
+            }
+
+            public static void IsValidImport(Object[] usdAsObjects, int expectedGameObjectCount, int expectedPrimSourceCount, int expectedMaterialCount)
+            {
+                Assert.NotZero(usdAsObjects.Length);
+
+                bool playableAssetFound = false;
+                int gameObjectCount = 0;
+                int materialCount = 0;
+                int usdPrimSourceCount = 0;
+
+                foreach (Object childObject in usdAsObjects)
+                {
+                    switch (childObject.GetType().Name)
+                    {
+                        case nameof(ObjectTypeName.UsdPlayableAsset):
+                            playableAssetFound = true;
+                            break;
+
+                        case nameof(ObjectTypeName.GameObject):
+                            gameObjectCount++;
+                            break;
+
+                        case nameof(ObjectTypeName.Material):
+                            materialCount++;
+                            break;
+
+                        case nameof(ObjectTypeName.UsdPrimSource):
+                            usdPrimSourceCount++;
+                            break;
+
+                        default:
+                            break;
+                    }
+                }
+
+                Assert.IsTrue(playableAssetFound, "No PlayableAssset was found in the prefab.");
+                Assert.AreEqual(expectedGameObjectCount, gameObjectCount, "Wrong GameObjects count in the prefab.");
+                Assert.AreEqual(expectedPrimSourceCount, usdPrimSourceCount, "Wrong USD Prim Source object in the prefab");
+                Assert.AreEqual(expectedMaterialCount, materialCount, "Wrong Materials count in the prefab");
+            }
+        }
+
+        public static void IsTextureDataSaved(GameObject usdObject, string fileName, bool isPrefab)
+        {
+            var materials = usdObject.transform.Find(TestAssetData.ImportGameObjectName.Material);
+            var rootPrim = usdObject.transform.Find(TestAssetData.ImportGameObjectName.RootPrim);
+
+            Assert.IsTrue(rootPrim.childCount == 1);
+            Assert.AreEqual(materials.childCount, rootPrim.childCount);
+
+            foreach (Transform child in materials)
+            {
+                // TODO: Not sure how to access "Prim Type"
+                Assert.IsNotNull(child.GetComponent<UsdPrimSource>());
+            }
+
+            var renderer = rootPrim.Find(fileName).GetComponent<MeshRenderer>();
+
+            Material[] allMaterials;
+            if (isPrefab)
+            {
+                allMaterials = renderer.sharedMaterials;
+            }
+            else
+            {
+                allMaterials = renderer.materials;
+            }
+
+            foreach (var material in allMaterials)
+            {
+                IsTextureFileMapped(fileName, material);
+            }
+        }
+
+        private static void IsTextureFileMapped(string fileName, Material material)
+        {
+            switch (fileName)
+            {
+                case TestAssetData.FileName.TexturedTransparent_Cutout:
+                    {
+                        Assert.AreEqual("Cutout", material.GetTag("RenderType", false));
+                        Assert.AreEqual("textured_transparency", material.mainTexture.name);
+                        Assert.AreEqual(1f, material.GetFloat("_Cutoff"));
+                        break;
+                    }
+                case TestAssetData.FileName.TexturedOpaque:
+                    {
+                        Assert.AreEqual("Opaque", material.GetTag("RenderType", false));
+                        Assert.AreEqual("textured", material.mainTexture.name);
+                        break;
+                    }
+
+                default:
+                    break;
+            }
+
+            Assert.AreEqual("textured_metallic.metalicRough", material.GetTexture("_MetallicGlossMap").name);
+            Assert.AreEqual("textured_normal", material.GetTexture("_BumpMap").name);
+            Assert.AreEqual("textured_emissive", material.GetTexture("_EmissionMap").name);
+        }
+    }
+}

package/com.unity.formats.usd/Tests/Common/Data/UsdImportTests/TexturedOpaque.usda

@@ -0,0 +1,114 @@
+#usda 1.0
+(
+"""
+USDA 1.0 file created for Unity USD Import test
+"""
+    defaultPrim = "RootPrim"
+    metersPerUnit = 1
+    upAxis = "Y"
+)
+
+def Xform "RootPrim"
+{
+    def Mesh "TexturedOpaque"
+    {
+        int[] faceVertexCounts = [4, 4, 4, 4, 4]
+        int[] faceVertexIndices = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
+        rel material:binding = </Material/TexturedOpaque>
+        normal3f[] normals = [(-1, 0, 0), (-1, 0, 0), (-1, 0, 0), (-1, 0, 0), (0, 0, -1), (0, 0, -1), (0, 0, -1), (0, 0, -1), (1, 0, 0), (1, 0, 0), (1, 0, 0), (1, 0, 0), (0, 1, 0), (0, 1, 0), (0, 1, 0), (0, 1, 0), (0, 0, 1), (0, 0, 1), (0, 0, 1), (0, 0, 1)]
+        point3f[] points = [(0, 1, -2), (0, 1, -1), (0, 2, -1), (0, 2, -2), (1, 1, -2), (0, 1, -2), (0, 2, -2), (1, 2, -2), (1, 1, -1), (1, 1, -2), (1, 2, -2), (1, 2, -1), (0, 2, -1), (1, 2, -1), (1, 2, -2), (0, 2, -2), (0, 1, -1), (1, 1, -1), (1, 2, -1), (0, 2, -1)]
+        texCoord2f[] primvars:st = [(0, 0), (1, 0), (1, 1), (0, 1), (0, 0), (1, 0), (1, 1), (0, 1), (0, 0), (1, 0), (1, 1), (0, 1), (0, 0), (1, 0), (1, 1), (0, 1), (0, 0), (1, 0), (1, 1), (0, 1)] (
+            interpolation = "vertex"
+        )
+    }
+}
+
+def Scope "Material" (
+    kind = "model"
+)
+{
+    def Material "TexturedOpaque"
+    {
+        token outputs:displacement.connect = </Material/TexturedOpaque/PreviewSurface.outputs:displacement>
+        token outputs:surface.connect = </Material/TexturedOpaque/PreviewSurface.outputs:surface>
+
+        def Shader "PreviewSurface"
+        {
+            uniform token info:id = "UsdPreviewSurface"
+            color3f inputs:diffuseColor.connect = </Material/TexturedOpaque/main_texture.outputs:rgb>
+            float inputs:metallic.connect = </Material/TexturedOpaque/metallic_texture.outputs:r>
+            color3f inputs:emissiveColor.connect = </Material/TexturedOpaque/emissive_texture.outputs:rgb>
+            normal3f inputs:normal.connect = </Material/TexturedOpaque/normal_texture.outputs:rgb>
+            float inputs:opacity = 1
+            float inputs:roughness.connect = </Material/TexturedOpaque/roughness_texture.outputs:r>
+            int inputs:useSpecularWorkflow = 0
+            token outputs:out
+            token outputs:surface
+        }
+
+        def Shader "uv_reader"
+        {
+            uniform token info:id = "UsdPrimvarReader_float2"
+            float2 inputs:fallback = (0, 0)
+            token inputs:varname = "st"
+            float2 outputs:result
+        }
+
+        def Shader "roughness_texture"
+        {
+            uniform token info:id = "UsdUVTexture"
+            asset inputs:file = @./Textures/textured_rough.png@
+            token inputs:sourceColorSpace = "raw"
+            float2 inputs:st.connect = </Material/TexturedOpaque/uv_reader.outputs:result>
+            token inputs:wrapS = "repeat"
+            token inputs:wrapT = "repeat"
+            float outputs:r
+        }
+
+        def Shader "normal_texture"
+        {
+            uniform token info:id = "UsdUVTexture"
+            float4 inputs:bias = (-1, 1, -1, -1)
+            asset inputs:file = @./Textures/textured_normal.png@
+            float4 inputs:scale = (2, -2, 2, 2)
+            token inputs:sourceColorSpace = "raw"
+            float2 inputs:st.connect = </Material/TexturedOpaque/uv_reader.outputs:result>
+            token inputs:wrapS = "repeat"
+            token inputs:wrapT = "repeat"
+            float3 outputs:rgb
+        }
+
+        def Shader "main_texture"
+        {
+            uniform token info:id = "UsdUVTexture"
+            asset inputs:file = @./Textures/textured.png@
+            token inputs:sourceColorSpace = "sRGB"
+            float2 inputs:st.connect = </Material/TexturedOpaque/uv_reader.outputs:result>
+            token inputs:wrapS = "repeat"
+            token inputs:wrapT = "repeat"
+            color3f outputs:rgb
+        }
+
+        def Shader "metallic_texture"
+        {
+            uniform token info:id = "UsdUVTexture"
+            asset inputs:file = @./Textures/textured_metallic.png@
+            token inputs:sourceColorSpace = "raw"
+            float2 inputs:st.connect = </Material/TexturedOpaque/uv_reader.outputs:result>
+            token inputs:wrapS = "repeat"
+            token inputs:wrapT = "repeat"
+            float outputs:r
+        }
+
+        def Shader "emissive_texture"
+        {
+            uniform token info:id = "UsdUVTexture"
+            asset inputs:file = @./Textures/textured_emissive.png@
+            float4 inputs:scale = (1000, 1000, 1000, 1)
+            float2 inputs:st.connect = </Material/TexturedOpaque/uv_reader.outputs:result>
+            token inputs:wrapS = "repeat"
+            token inputs:wrapT = "repeat"
+            float3 outputs:rgb
+        }
+    }
+}