improved performance when extracting all materials from importer

Author: robertdorn83

Editor/Scripts/GLTFImporterInspector.cs

@@ -263,6 +263,32 @@ private void RemappingUI<T>(GLTFImporter t, SerializedProperty importedData, str
 				// TODO this also counts old remaps that are not used anymore
 				var remapCount = externalObjectMap.Values.Count(x => x is T);
 
+				void ExtractAssets(T[] subAssets, bool importImmediately)
+				{
+					var assetPath = AssetDatabase.GetAssetPath(subAssets[0]);
+					var assetImporter = AssetImporter.GetAtPath(assetPath);
+					foreach (var subAsset in subAssets)
+					{
+						if (!subAsset) return;
+						var filename = SanitizePath(subAsset.name);
+						var dirName = Path.GetDirectoryName(t.assetPath) + "/" + subDirectoryName;
+						if (!Directory.Exists(dirName))
+							Directory.CreateDirectory(dirName);
+						var destinationPath = dirName + "/" + filename + fileExtension;
+
+						var clone = Instantiate(subAsset);
+						AssetDatabase.CreateAsset(clone, destinationPath);
+
+						assetImporter.AddRemap(new AssetImporter.SourceAssetIdentifier(subAsset), clone);
+					}
+
+					if (importImmediately)
+					{
+						AssetDatabase.WriteImportSettingsIfDirty(assetPath);
+						AssetDatabase.ImportAsset(assetPath, ImportAssetOptions.ForceUpdate);
+					}
+				}
+				
 				void ExtractAsset(T subAsset, bool importImmediately)
 				{
 					if (!subAsset) return;