add description, move plugin toggle to the left

Runtime/Scripts/Extensions/MaterialExtensions.cs

@@ -49,6 +49,7 @@ public override GltfExportPluginContext CreateInstance(ExportContext context)
 		}
 
 		public override string DisplayName => "Material Extensions";
+		public override string Description => "Exports various glTF PBR Material model extensions.";
 	}
 
 	public class MaterialExtensions: GltfExportPluginContext

Runtime/Scripts/Extensions/TextMeshExport.cs

@@ -2,34 +2,34 @@
 using GLTF.Schema;
 using UnityEngine;
 using UnityGLTF.Extensions;
+using UnityGLTF.Plugins;
 
 namespace UnityGLTF
 {
-	public static class TextMeshExport
+	public class TextMeshExport : GltfExportPlugin
 	{
-#if UNITY_EDITOR
-		[UnityEditor.InitializeOnLoadMethod]
-#else
-		[RuntimeInitializeOnLoadMethod]
-#endif
-		static void Init()
+		public override string DisplayName => "TextMeshPro Export as Mesh";
+		public override string Description => "Bakes 3D TextMeshPro objects (not UI/Canvas) into meshes and attempts to faithfully apply their shader settings to generate the font texture.";
+		public override GltfExportPluginContext CreateInstance(ExportContext context)
 		{
-			GLTFSceneExporter.BeforeMaterialExport += BeforeMaterialExport;
-			GLTFSceneExporter.AfterSceneExport += CleanUpRenderTextureCache;
+			return new TextMeshExportContext();
 		}
-
-		private static void CleanUpRenderTextureCache(GLTFSceneExporter _, GLTFRoot __)
+	}
+
+	public class TextMeshExportContext: GltfExportPluginContext
+	{
+		public override void AfterSceneExport(GLTFSceneExporter _, GLTFRoot __)
 		{
 			if (rtCache == null) return;
 			foreach (var kvp in rtCache)
 				kvp.Value.Release();
 			rtCache.Clear();
 		}
 
-		private static Material tempMat;
-		private static Dictionary<Texture, RenderTexture> rtCache;
+		private Material tempMat;
+		private Dictionary<Texture, RenderTexture> rtCache;
 
-		private static bool BeforeMaterialExport(GLTFSceneExporter exporter, GLTFRoot gltfRoot, Material material, GLTFMaterial materialNode)
+		public override bool BeforeMaterialExport(GLTFSceneExporter exporter, GLTFRoot gltfRoot, Material material, GLTFMaterial materialNode)
 		{
 			if (material.shader.name.Contains("TextMeshPro")) // seems to only work for TextMeshPro/Mobile/ right now (SDFAA_HINTED?)
 			{

Runtime/Scripts/GLTFSettings.cs

@@ -124,23 +124,24 @@ internal static void OnPluginsGUI(IEnumerable<GltfPlugin> plugins)
 		        var expanded = SessionState.GetBool(key, false);
 		        using (new GUILayout.HorizontalScope())
 		        {
-			        var label = new GUIContent(displayName);
+			        plugin.Enabled = GUILayout.Toggle(plugin.Enabled, "", GUILayout.Width(12));
+			        var label = new GUIContent(displayName, plugin.Description);
 			        var expanded2 = EditorGUILayout.Foldout(expanded, label);
 			        if (expanded2 != expanded)
 			        {
 				        expanded = expanded2;
 				        SessionState.SetBool(key, expanded2);
 			        }
-			        plugin.Enabled = GUILayout.Toggle(plugin.Enabled, "", GUILayout.Width(20));
 		        }
 		        if (expanded)
 		        {
-			        EditorGUI.indentLevel++;
+			        EditorGUI.indentLevel += 2;
+			        EditorGUILayout.HelpBox(plugin.Description, MessageType.None);
 			        editorCache.TryGetValue(plugin.GetType(), out var editor);
 			        Editor.CreateCachedEditor(plugin, null, ref editor);
 			        editorCache[plugin.GetType()] = editor;
 			        editor.OnInspectorGUI();
-			        EditorGUI.indentLevel--;
+			        EditorGUI.indentLevel -= 2;
 		        }
 		        EditorGUILayout.EndFoldoutHeaderGroup();
 	        }

Runtime/Scripts/Plugins/GltfPlugin.cs

@@ -5,6 +5,8 @@ namespace UnityGLTF.Plugins
     public abstract class GltfPlugin: ScriptableObject
     {
         public abstract string DisplayName { get; }
+        public abstract string Description { get; }
+        public virtual string HelpUrl => "";
         public bool Enabled { get; set; } = true;
     }
 }