wip showing extensions

Runtime/Plugins/GLTFSerialization/Extensions/MSFT_LODExtension.cs

@@ -9,7 +9,6 @@ namespace GLTF.Schema
 	/// </summary>
 	public class MSFT_LODExtension : IExtension
 	{
-
 		public List<int> NodeIds { get; set; }
 		public MSFT_LODExtension(List<int> nodeIds)
 		{

Runtime/Plugins/GLTFSerialization/Schema/GLTFProperty.cs

@@ -9,6 +9,17 @@ namespace GLTF.Schema
 {
 	public class GLTFProperty
 	{
+		public static IReadOnlyList<string> RegisteredExtensions
+		{
+			get
+			{
+				lock (_extensionRegistry)
+				{
+					return _extensionRegistry.Keys.ToList();
+				}
+			}
+		}
+
 		private static Dictionary<string, ExtensionFactory> _extensionRegistry = new Dictionary<string, ExtensionFactory>()
 		{
 			{ ExtTextureTransformExtensionFactory.EXTENSION_NAME, new ExtTextureTransformExtensionFactory() },

Runtime/Scripts/GLTFSettings.cs

@@ -7,6 +7,7 @@
 using UnityEngine;
 using System.IO;
 using System.Linq;
+using GLTF.Schema;
 using UnityEngine.UIElements;
 using UnityGLTF.Cache;
 using UnityGLTF.Plugins;
@@ -120,6 +121,15 @@ internal static void OnPluginsGUI()
 		        }
 		        EditorGUILayout.EndFoldoutHeaderGroup();
 	        }
+
+	        EditorGUILayout.LabelField("Supported Extensions (Import)", EditorStyles.boldLabel);
+	        // All plugins in the extension factory are supported for import.
+	        // TODO Some of them have extra package requirements (e.g. meshopt/draco), could be shown here
+	        // TODO help buttons and docs/tooltip would be great
+	        foreach (var ext in GLTFProperty.RegisteredExtensions)
+	        {
+		        EditorGUILayout.ToggleLeft(ext, true);
+	        }
         }
 
     }