Merge branch 'feat/3D-model-editor' into 'main_dev'

feat：加入3D编辑器

See merge request yunteng/thingskit-view!289

-import path from 'path'
+import path, { resolve } from 'path'
 import { BuildOptions } from 'vite'
 import { BuildOptions } from 'vite'
 export const OUTPUT_DIR = 'dist'
 export const OUTPUT_DIR = 'dist'
 
 
@@ -13,6 +13,10 @@ export const brotliSize = false
 
 
 // 分包
 // 分包
 export const rollupOptions: BuildOptions['rollupOptions'] = {
 export const rollupOptions: BuildOptions['rollupOptions'] = {
+  input: {
+    main: resolve(__dirname, '../index.html'),
+    editor: resolve(__dirname, '../editor/index.html'),
+  },
   output: {
   output: {
     chunkFileNames: 'static/js/[name]-[hash].js',
     chunkFileNames: 'static/js/[name]-[hash].js',
     entryFileNames: 'static/js/[name]-[hash].js',
     entryFileNames: 'static/js/[name]-[hash].js',

+import { Plugin } from 'vite'
 import { createHtmlPlugin } from 'vite-plugin-html'
 import { createHtmlPlugin } from 'vite-plugin-html'
 
 
 const GLOB_CONFIG_FILE_NAME = '_app.config.js'
 const GLOB_CONFIG_FILE_NAME = '_app.config.js'
 
 
-export function configHtmlPlugin(env: ViteEnv, isBuild: boolean) {
+export function configHtmlPlugin(env: ViteEnv, isBuild: boolean): Plugin {
   const { VITE_GLOB_APP_TITLE, VITE_GLOB_PUBLIC_PATH } = env
   const { VITE_GLOB_APP_TITLE, VITE_GLOB_PUBLIC_PATH } = env
   const getAppConfigSrc = () => {
   const getAppConfigSrc = () => {
     const path = VITE_GLOB_PUBLIC_PATH
     const path = VITE_GLOB_PUBLIC_PATH
@@ -24,5 +25,21 @@ export function configHtmlPlugin(env: ViteEnv, isBuild: boolean) {
     }
     }
   })
   })
 
 
-  return htmlPlugin
+
+
+  return {
+    name: 'html-plugin',
+    transformIndexHtml: (code, ctx) => {
+      return {
+        html: code,
+        tags: isBuild ? [
+          {
+            tag: 'script',
+            attrs: { src: getAppConfigSrc() }
+          }
+        ] : []
+      }
+    },
+
+  }
 }
 }

+{
+    "extends": [
+        "../.eslintrc.json"
+    ],
+    "parserOptions": {
+        "sourceType": "module",
+        "ecmaVersion": 2020
+    }
+}

+:root {
+	color-scheme: light dark;
+}
+
+[hidden] {
+	display: none !important;
+}
+
+body {
+	font-family: Helvetica, Arial, sans-serif;
+	font-size: 14px;
+	margin: 0;
+	overflow: hidden;
+}
+
+hr {
+	border: 0;
+	border-top: 1px solid #ccc;
+}
+
+button {
+	position: relative;
+}
+
+input {
+	vertical-align: middle;
+}
+
+	input[type="color"]::-webkit-color-swatch-wrapper {
+		padding: 0;
+	}
+	input[type="color"]::-webkit-color-swatch {
+		border: none;
+	}
+
+textarea {
+	tab-size: 4;
+	white-space: pre;
+	word-wrap: normal;
+}
+
+	textarea.success {
+		border-color: #8b8 !important;
+	}
+
+	textarea.fail {
+		border-color: #f00 !important;
+		background-color: rgba(255,0,0,0.05);
+	}
+
+textarea, input { outline: none; } /* osx */
+
+.Panel {
+	-moz-user-select: none;
+	-webkit-user-select: none;
+	-ms-user-select: none;
+
+	/* No support for these yet */
+	-o-user-select: none;
+	user-select: none;
+}
+
+.TabbedPanel {
+	-moz-user-select: none;
+	-webkit-user-select: none;
+	-ms-user-select: none;
+
+	/* No support for these yet */
+	-o-user-select: none;
+	user-select: none;
+	position: relative;
+	display: block;
+	width: 100%;
+	min-width: 335px;
+}
+
+.TabbedPanel .Tabs {
+	position: relative;
+	z-index: 1; /** Above .Panels **/
+	display: block;
+	width: 100%;
+	white-space: pre;
+	overflow: hidden;
+	overflow-x: auto;
+}
+
+	.TabbedPanel .Tabs::-webkit-scrollbar {
+		height: 5px;
+		background: #eee;
+	}
+	.TabbedPanel .Tabs::-webkit-scrollbar-thumb {
+		background: #08f3;
+	}
+	.TabbedPanel .Tabs:hover::-webkit-scrollbar-thumb {
+		background: #08f;
+		cursor: ew-resize;
+	}
+
+	.TabbedPanel .Tabs .Tab {
+		padding: 10px 9px;
+		text-transform: uppercase;
+	}
+
+	.TabbedPanel .Panels {
+		position: absolute;
+		top: 40px;
+		display: block;
+		width: 100%;
+	}
+
+/* Listbox */
+.Listbox {
+	color: #444;
+	background-color: #fff;
+	padding: 0;
+	width: 100%;
+	min-height: 180px;
+	font-size: 12px;
+	cursor: default;
+	overflow: auto;
+}
+
+.Listbox .ListboxItem {
+	padding: 6px;
+	color: #666;
+	white-space: nowrap;
+}
+
+.Listbox .ListboxItem.active {
+	background-color: rgba(0, 0, 0, 0.04);
+}
+
+/* CodeMirror */
+
+.CodeMirror {
+
+	position: absolute !important;
+	top: 37px;
+	width: 100% !important;
+	height: calc(100% - 37px) !important;
+
+}
+
+	.CodeMirror .errorLine {
+
+		background: rgba(255,0,0,0.25);
+
+	}
+
+	.CodeMirror .esprima-error {
+
+		color: #f00;
+		text-align: right;
+		padding: 0 20px;
+
+	}
+
+/* outliner */
+
+#outliner .opener {
+	display: inline-block;
+	width: 14px;
+	height: 14px;
+	margin: 0px 4px;
+	vertical-align: top;
+	text-align: center;
+}
+
+	#outliner .opener.open:after {
+		content: '−';
+	}
+
+	#outliner .opener.closed:after {
+		content: '+';
+	}
+
+#outliner .option {
+
+	border: 1px solid transparent;
+
+}
+
+#outliner .option.drag {
+
+	border: 1px dashed #999;
+
+}
+
+#outliner .option.dragTop {
+
+	border-top: 1px dashed #999;
+
+}
+
+#outliner .option.dragBottom {
+
+	border-bottom: 1px dashed #999;
+
+}
+
+#outliner .type {
+	display: inline-block;
+	width: 14px;
+	height: 14px;
+	color: #ddd;
+	text-align: center;
+}
+
+#outliner .type:after {
+	content: '●';
+}
+
+/* */
+
+#outliner .Scene {
+	color: #8888dd;
+}
+
+#outliner .Camera {
+	color: #dd8888;
+}
+
+#outliner .Light {
+	color: #dddd88;
+}
+
+/* */
+
+#outliner .Object3D {
+	color: #aaaaee;
+}
+
+#outliner .Mesh {
+	color: #8888ee;
+}
+
+#outliner .Line {
+	color: #88ee88;
+}
+
+#outliner .LineSegments {
+	color: #88ee88;
+}
+
+#outliner .Points {
+	color: #ee8888;
+}
+
+/* */
+
+#outliner .Geometry {
+	color: #aaeeaa;
+}
+
+#outliner .Material {
+	color: #eeaaee;
+}
+
+/* */
+
+#outliner .Script:after {
+	content: '◎'
+}
+
+/*  */
+
+button {
+	color: #555;
+	background-color: #ddd;
+	border: 0px;
+	margin: 0px; /* GNOME Web */
+	padding: 5px 8px;
+	font-size: 12px;
+	text-transform: uppercase;
+	cursor: pointer;
+	outline: none;
+}
+
+	button:hover {
+		background-color: #fff;
+	}
+
+	button.selected {
+		background-color: #fff;
+	}
+
+input, textarea {
+	border: 1px solid transparent;
+	color: #444;
+}
+
+input.Number {
+	color: #08f!important;
+	font-size: 12px;
+	border: 0px;
+	padding: 2px;
+}
+
+select {
+	color: #666;
+	background-color: #ddd;
+	border: 0px;
+	text-transform: uppercase;
+	cursor: pointer;
+	outline: none;
+}
+
+	select:hover {
+		background-color: #fff;
+	}
+
+/* UI */
+
+#resizer {
+	position: absolute;
+	z-index: 2; /* Above #sidebar */
+	top: 32px;
+	right: 350px;
+	width: 5px;
+	bottom: 0px;
+	transform: translatex(2.5px);
+	cursor: col-resize;
+}
+
+	#resizer:hover {
+		background-color: #08f8;
+		transition-property: background-color;
+		transition-delay: 0.1s;
+		transition-duration: 0.2s;
+	}
+
+	#resizer:active {
+		background-color: #08f;
+	}
+
+#viewport {
+	position: absolute;
+	top: 32px;
+	left: 0;
+	right: 350px;
+	bottom: 0;
+}
+
+	#viewport .Text {
+		text-shadow: 1px 1px 0 rgba(0,0,0,0.25);
+		pointer-events: none;
+	}
+
+#script {
+	position: absolute;
+	top: 32px;
+	left: 0;
+	right: 350px;
+	bottom: 0;
+	opacity: 0.9;
+}
+
+#player {
+	position: absolute;
+	top: 32px;
+	left: 0;
+	right: 350px;
+	bottom: 0;
+}
+
+#menubar {
+	position: absolute;
+	width: 100%;
+	height: 32px;
+	background: #eee;
+	padding: 0;
+	margin: 0;
+	right: 0;
+	top: 0;
+}
+
+	#menubar .menu {
+		float: left;
+		cursor: pointer;
+		padding-right: 8px;
+	}
+
+	#menubar .menu.right {
+		float: right;
+		cursor: auto;
+		padding-right: 0;
+		text-align: right;
+	}
+
+		#menubar .menu .title {
+			display: inline-block;
+			color: #888;
+			margin: 0;
+			padding: 8px;
+			line-height: 16px;
+		}
+
+		#menubar .menu .key {
+			position: absolute;
+			right: 10px;
+			color: #ccc;
+			border: 1px solid #ccc;
+			border-radius: 4px;
+			font-size: 9px;
+			padding: 2px 4px;
+			right: 10px;
+			pointer-events: none;
+		}
+
+		#menubar .menu .options {
+			position: fixed;
+			z-index: 1; /* higher than resizer */
+			display: none;
+			padding: 5px 0;
+			background: #eee;
+			min-width: 150px;
+			max-height: calc(100vh - 80px);
+			overflow: auto;
+		}
+
+		#menubar .menu:hover .options {
+			display: block;
+			box-shadow: 0 10px 10px -5px #00000033;
+		}
+
+			#menubar .menu .options hr {
+				border-color: #ddd;
+			}
+
+			#menubar .menu .options .option {
+				color: #666;
+				background-color: transparent;
+				padding: 5px 10px;
+				margin: 0 !important;
+			}
+
+				#menubar .menu .options .option:hover {
+					color: #fff;
+					background-color: #08f;
+				}
+
+				#menubar .menu .options .option:not(.submenu-title):active {
+					color: #666;
+					background: transparent;
+				}
+
+				#menubar .menu .options .option.toggle::before {
+
+					content: ' ';
+					display: inline-block;
+					width: 16px;
+
+				}
+
+				#menubar .menu .options .option.toggle-on::before {
+
+					content: '✔';
+					font-size: 12px;
+
+				}
+
+				#menubar .submenu-title::after {
+					content: '⏵';
+					float: right;
+				}
+
+		#menubar .menu .options .inactive {
+			color: #bbb;
+			background-color: transparent;
+			padding: 5px 10px;
+			margin: 0 !important;
+			cursor: not-allowed;
+		}
+
+		
+
+#sidebar {
+	position: absolute;
+	right: 0;
+	top: 32px;
+	bottom: 0;
+	width: 350px;
+	background: #eee;
+	overflow: auto;
+	overflow-x: hidden;
+}
+
+	#sidebar .Panel {
+		color: #888;
+		padding: 10px;
+		border-top: 1px solid #ccc;
+	}
+
+	#sidebar .Panel.collapsed {
+		margin-bottom: 0;
+	}
+
+	#sidebar .Row {
+		display: flex;
+		align-items: center;
+		min-height: 24px;
+		margin-bottom: 10px;
+	}
+
+	#sidebar .Row .Label {
+
+		width: 120px;
+
+	}
+
+#tabs {
+	background-color: #ddd;
+	border-top: 1px solid #ccc;
+}
+
+	#tabs span {
+		color: #aaa;
+		border-right: 1px solid #ccc;
+		padding: 10px;
+	}
+
+	#tabs span.selected {
+		color: #888;
+		background-color: #eee;
+	}
+
+#toolbar {
+	position: absolute;
+	left: 10px;
+	top: 42px;
+	width: 32px;
+	background: #eee;
+	text-align: center;
+}
+
+	#toolbar button, #toolbar input {
+		height: 32px;
+	}
+
+		#toolbar button img {
+			width: 16px;
+			opacity: 0.5;
+		}
+
+.Outliner {
+	color: #444;
+	background-color: #fff;
+	padding: 0;
+	width: 100%;
+	height: 180px;
+	font-size: 12px;
+	cursor: default;
+	overflow: auto;
+	resize: vertical;
+	outline: none !important;
+}
+
+	.Outliner .option {
+		padding: 4px;
+		color: #666;
+		white-space: nowrap;
+	}
+
+	.Outliner .option:hover {
+		background-color: rgba(0,0,0,0.02);
+	}
+
+	.Outliner .option.active {
+		background-color: rgba(0,0,0,0.04);
+	}
+
+
+.TabbedPanel .Tabs {
+	background-color: #ddd;
+	border-top: 1px solid #ccc;
+}
+
+	.TabbedPanel .Tab {
+		color: #aaa;
+		border-right: 1px solid #ccc;
+	}
+
+	.TabbedPanel .Tab.selected {
+		color: #888;
+		background-color: #eee;
+	}
+
+.Listbox {
+	color: #444;
+	background-color: #fff;
+}
+
+.Panel {
+	color: #888;
+}
+
+/* */
+
+@media all and ( max-width: 600px ) {
+
+	#resizer {
+		display: none;
+	}
+
+	#menubar .menu .options {
+		max-height: calc(100% - 80px);
+	}
+
+	#menubar .menu.right {
+		display: none;
+	}
+
+	#viewport {
+		left: 0;
+		right: 0;
+		top: 32px;
+		height: calc(100% - 352px);
+	}
+
+	#script {
+		left: 0;
+		right: 0;
+		top: 32px;
+		height: calc(100% - 352px);
+	}
+
+	#player {
+		left: 0;
+		right: 0;
+		top: 32px;
+		height: calc(100% - 352px);
+	}
+
+	#sidebar {
+		left: 0;
+		width: 100%;
+		top: calc(100% - 320px);
+		bottom: 0;
+	}
+
+}
+
+/* DARK MODE */
+
+@media ( prefers-color-scheme: dark ) {
+
+	button {
+		color: #aaa;
+		background-color: #222;
+	}
+
+		button:hover {
+			color: #ccc;
+			background-color: #444;
+		}
+
+		button.selected {
+			color: #fff;
+			background-color: #08f;
+		}
+
+	input, textarea {
+		background-color: #222;
+		border: 1px solid transparent;
+		color: #888;
+	}
+
+	select {
+		color: #aaa;
+		background-color: #222;
+	}
+
+		select:hover {
+			color: #ccc;
+			background-color: #444;
+		}
+
+	/* UI */
+
+	#menubar {
+		background: #111;
+	}
+
+			#menubar .menu .key {
+				color: #444;
+				border-color: #444;
+			}
+
+			#menubar .menu .options {
+				background: #111;
+			}
+
+				#menubar .menu .options hr {
+					border-color: #222;
+				}
+
+				#menubar .menu .options .option {
+					color: #888;
+				}
+
+			#menubar .menu .options .inactive {
+				color: #444;
+			}
+
+	#sidebar {
+		background-color: #111;
+	}
+
+		#sidebar .Panel {
+			border-top: 1px solid #222;
+		}
+
+		#sidebar .Panel.Material canvas {
+			border: solid 1px #5A5A5A;
+		}
+
+	#tabs {
+		background-color: #1b1b1b;
+		border-top: 1px solid #222;
+	}
+
+		#tabs span {
+			color: #555;
+			border-right: 1px solid #222;
+		}
+
+		#tabs span.selected {
+			background-color: #111;
+		}
+
+	#toolbar {
+		background-color: #111;
+	}
+
+		#toolbar img {
+			filter: invert(1);
+		}
+
+	.Outliner {
+		background: #222;
+	}
+
+		.Outliner .option {
+			color: #999;
+		}
+
+		.Outliner .option:hover {
+			background-color: rgba(21,60,94,0.5);
+		}
+
+		.Outliner .option.active {
+			background-color: rgba(21,60,94,1);
+		}
+
+	.TabbedPanel .Tabs {
+		background-color: #1b1b1b;
+		border-top: 1px solid #222;
+	}
+
+		.TabbedPanel .Tabs::-webkit-scrollbar {
+			background: #111;
+		}
+
+		.TabbedPanel .Tab {
+			color: #555;
+			border-right: 1px solid #222;
+		}
+
+		.TabbedPanel .Tab.selected {
+			color: #888;
+			background-color: #111;
+		}
+
+	.Listbox {
+		color: #888;
+		background: #222;
+	}
+
+	.Listbox .ListboxItem:hover {
+		background-color: rgba(21,60,94,0.5);
+	}
+
+	.Listbox .ListboxItem.active {
+		background-color: rgba(21,60,94,1);
+	}
+
+}
+
+/* Temporary Chrome fix (#24794) */
+
+[draggable="true"] {
+	transform: translate(0, 0);
+	z-index: 0;
+}

+How to implement additional commands for undo/redo functionality?
+===
+
+### Basics ###
+
+After evaluating different design patterns for undo/redo we decided to use the [command-pattern](http://en.wikipedia.org/wiki/Command_pattern) for implementing undo/redo functionality in the three.js-editor.
+
+This means that every action is encapsulated in a command-object which contains all the relevant information to restore the previous state.
+
+In our implementation we store the old and the new state separately (we don't store the complete state but rather the attribute and value which has changed).
+It would also be possible to only store the difference between the old and the new state.
+
+**Before implementing your own command you should look if you can't reuse one of the already existing ones.**
+
+For numbers, strings or booleans the Set...ValueCommand-commands can be used.
+Then there are separate commands for:
+- setting a color property (THREE.Color)
+- setting maps (THREE.Texture)
+- setting geometries
+- setting materials
+- setting position, rotation and scale
+
+### Template for new commands ###
+
+Every command needs a constructor. In the constructor
+
+```javascript
+
+function DoSomethingCommand( editor ) {
+
+	Command.call( this, editor ); // Required: Call default constructor
+
+	this.type = 'DoSomethingCommand';            // Required: has to match the object-name!
+	this.name = 'Set/Do/Update Something'; // Required: description of the command, used in Sidebar.History
+
+	// TODO: store all the relevant information needed to
+	// restore the old and the new state
+
+}
+```
+
+And as part of the prototype you need to implement four functions
+- **execute:** which is also used for redo
+- **undo:** which reverts the changes made by 'execute'
+- **toJSON:** which serializes the command so that the undo/redo-history can be preserved across a browser refresh
+- **fromJSON:** which deserializes the command
+
+```javascript
+DoSomethingCommand.prototype = {
+
+	execute: function () {
+
+		// TODO: apply changes to 'object' to reach the new state
+
+	},
+
+	undo: function () {
+
+		// TODO: restore 'object' to old state
+
+	},
+
+	toJSON: function () {
+
+		var output = Command.prototype.toJSON.call( this ); // Required: Call 'toJSON'-method of prototype 'Command'
+
+		// TODO: serialize all the necessary information as part of 'output' (JSON-format)
+		// so that it can be restored in 'fromJSON'
+
+		return output;
+
+	},
+
+	fromJSON: function ( json ) {
+
+		Command.prototype.fromJSON.call( this, json ); // Required: Call 'fromJSON'-method of prototype 'Command'
+
+		// TODO: restore command from json
+
+	}
+
+};
+
+```
+
+### Executing a command ###
+
+To execute a command we need an instance of the main editor-object. The editor-object functions as the only entry point through which all commands have to go to be added as part of the undo/redo-history.
+On **editor** we then call **.execute(...)*** with the new command-object which in turn calls **history.execute(...)** and adds the command to the undo-stack.
+
+```javascript
+
+editor.execute( new DoSomethingCommand() );
+
+```
+
+### Updatable commands ###
+
+Some commands are also **updatable**. By default a command is not updatable. Making a command updatable means that you
+have to implement a fifth function 'update' as part of the prototype. In it only the 'new' state gets updated while the old one stays the same.
+
+Here as an example is the update-function of **SetColorCommand**:
+
+```javascript
+update: function ( cmd ) {
+
+	this.newValue = cmd.newValue;
+
+},
+
+```
+
+#### List of updatable commands
+
+- SetColorCommand
+- SetGeometryCommand
+- SetMaterialColorCommand
+- SetMaterialValueCommand
+- SetPositionCommand
+- SetRotationCommand
+- SetScaleCommand
+- SetValueCommand
+- SetScriptValueCommand
+
+The idea behind 'updatable commands' is that two commands of the same type which occur
+within a short period of time should be merged into one.
+**For example:** Dragging with your mouse over the x-position field in the sidebar
+leads to hundreds of minor changes to the x-position.
+The user expectation is not to undo every single change that happened while they dragged
+the mouse cursor but rather to go back to the position before they started to drag their mouse.
+
+When editing a script the changes are also merged into one undo-step.

+Writing unit tests for undo-redo commands
+===
+
+### Overview ###
+
+Writing unit tests for undo/redo commands is easy.
+The main idea to simulate a scene, execute actions and perform undo and redo.
+Following steps are required.
+
+1. Create a new unit test file
+2. Include the new command and the unit test file in the editor's test suite
+3. Write the test
+4. Execute the test
+
+Each of the listed steps will now be described in detail.
+
+### 1. Create a new unit test file ###
+
+Create a new file in path `test/unit/editor/TestDoSomethingCommand.js`.
+
+### 2. Include the new command in the editor test suite ###
+
+Navigate to the editor test suite `test/unit/unittests_editor.html` and open it.
+Within the file, go to the `<!-- command object classes -->` and include the new command:
+
+```html
+// <!-- command object classes -->
+//...
+<script src="../../editor/js/commands/AddScriptCommand.js"></script>
+<script src="../../editor/js/commands/DoSomethingCommand.js"></script>         // add this line
+<script src="../../editor/js/commands/MoveObjectCommand.js"></script>
+//...
+```
+
+It is recommended to keep the script inclusions in alphabetical order, if possible.
+
+Next, in the same file, go to `<!-- Undo-Redo tests -->` and include the test file for the new command:
+
+```html
+// <!-- Undo-Redo tests -->
+//...
+<script src="editor/TestAddScriptCommand.js"></script>
+<script src="editor/TestDoSomethingCommand.js"></script>              // add this line
+<script src="editor/TestMoveObjectCommand.js"></script>
+//...
+```
+
+Again, keeping the alphabetical order is recommended.
+
+### 3. Write the test ###
+
+#### Template ####
+
+Open the unit test file `test/unit/editor/TestDoSomethingCommand.js` and paste following code:
+
+```javascript
+module( "DoSomethingCommand" );
+
+test("Test DoSomethingCommand (Undo and Redo)", function() {
+
+    var editor = new Editor();
+
+    var box = aBox( 'Name your box' );
+
+    // other available objects from "CommonUtilities.js"
+    // var sphere = aSphere( 'Name your sphere' );
+    // var pointLight = aPointLight( 'Name your pointLight' );
+    // var perspectiveCamera = aPerspectiveCamera( 'Name your perspectiveCamera' );
+
+    // in most cases you'll need to add the object to work with
+    editor.execute( new AddObjectCommand( editor, box ) );
+
+
+    // your test begins here...
+
+
+} );
+```
+
+The predefined code is just meant to ease the development, you do not have to stick with it.
+However, the test should cover at least one `editor.execute()`, one `editor.undo()` and one `editor.redo()` call.
+
+Best practice is to call `editor.execute( new DoSomethingCommand( {custom parameters} ) )` **twice**. Since you'll have to do one undo (go one step back), it is recommended to have a custom state for comparison. Try to avoid assertions `ok()` against default values.
+
+#### Assertions ####
+After performing `editor.execute()` twice, you can do your first assertion to check whether the executes are done correctly.
+
+Next, you perform `editor.undo()` and check if the last action was undone.
+
+Finally, perform `editor.redo()` and verify if the values are as expected.
+
+### 4. Execute the test ###
+
+Open the editor's unit test suite `test/unit/unittests_editor.html` in your browser and check the results from the test framework.

+{
+	"metadata": {
+		"type": "App"
+	},
+	"project": {
+		"shadows": true,
+		"vr": false
+	},
+	"camera": {
+		"metadata": {
+			"version": 4.5,
+			"type": "Object",
+			"generator": "Object3D.toJSON"
+		},
+		"object": {
+			"uuid": "0C0DD0AD-3A7F-4ECD-A9FE-CECD97D5CBD9",
+			"type": "PerspectiveCamera",
+			"name": "Camera",
+			"layers": 1,
+			"matrix": [0.939236,0,-0.343272,0,-0.147782,0.902586,-0.404351,0,0.309832,0.430511,0.847741,0,11.713146,19.228675,40.388679,1],
+			"fov": 50,
+			"zoom": 1,
+			"near": 0.1,
+			"far": 100000,
+			"focus": 10,
+			"aspect": 1.428977,
+			"filmGauge": 35,
+			"filmOffset": 0
+		}
+	},
+	"scene": {
+		"metadata": {
+			"version": 4.5,
+			"type": "Object",
+			"generator": "Object3D.toJSON"
+		},
+		"geometries": [
+			{
+				"uuid": "BBEE74D1-E43D-4C32-A9F3-4656E78C26F3",
+				"type": "PlaneGeometry",
+				"width": 30,
+				"height": 40,
+				"widthSegments": 1,
+				"heightSegments": 1
+			},
+			{
+				"uuid": "C1722F5F-89AD-45D8-B78C-D1D34AF2A012",
+				"type": "BoxGeometry",
+				"width": 2,
+				"height": 1,
+				"depth": 1,
+				"widthSegments": 1,
+				"heightSegments": 1,
+				"depthSegments": 1
+			},
+			{
+				"uuid": "327EFFCF-649C-4EF3-86D4-B422C5A86E89",
+				"type": "CylinderGeometry",
+				"radiusTop": 0.5,
+				"radiusBottom": 0.5,
+				"height": 2,
+				"radialSegments": 32,
+				"heightSegments": 1,
+				"openEnded": false
+			},
+			{
+				"uuid": "0791211B-BB02-4E57-82B5-64C05DE92B39",
+				"type": "SphereGeometry",
+				"radius": 0.5,
+				"widthSegments": 32,
+				"heightSegments": 16,
+				"phiStart": 0,
+				"phiLength": 6.28,
+				"thetaStart": 0,
+				"thetaLength": 3.14
+			},
+			{
+				"uuid": "73F12A47-9EA7-47FD-BCF3-89B8219B2626",
+				"type": "BoxGeometry",
+				"width": 2,
+				"height": 1,
+				"depth": 1,
+				"widthSegments": 1,
+				"heightSegments": 1,
+				"depthSegments": 1
+			},
+			{
+				"uuid": "3BDEB9FB-BDD4-44AD-8A47-008BED1C8982",
+				"type": "CylinderGeometry",
+				"radiusTop": 0.5,
+				"radiusBottom": 0.5,
+				"height": 2,
+				"radialSegments": 32,
+				"heightSegments": 1,
+				"openEnded": false
+			}],
+		"materials": [
+			{
+				"uuid": "2F69AF3A-DDF5-4BBA-87B5-80159F90DDBF",
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+				"color": 86015,
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+				"specular": 1118481,
+				"shininess": 30,
+				"depthFunc": 3,
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+				"depthWrite": true
+			},
+			{
+				"uuid": "D98FC4D1-169E-420A-92EA-20E55009A46D",
+				"type": "MeshBasicMaterial",
+				"color": 63744,
+				"depthFunc": 3,
+				"depthTest": true,
+				"depthWrite": true,
+				"wireframe": true
+			},
+			{
+				"uuid": "3B9DE64D-E1C8-4C24-9F73-3A9E10E3E655",
+				"type": "MeshPhongMaterial",
+				"color": 16777215,
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+				"shininess": 30,
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+				"depthWrite": true
+			},
+			{
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+				"type": "MeshPhongMaterial",
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+				"emissive": 0,
+				"specular": 1118481,
+				"shininess": 30,
+				"depthFunc": 3,
+				"depthTest": true,
+				"depthWrite": true
+			},
+			{
+				"uuid": "40EC9BDA-91C0-4671-937A-2BCB6DA7EEBB",
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+				"color": 63744,
+				"depthFunc": 3,
+				"depthTest": true,
+				"depthWrite": true,
+				"wireframe": true
+			}],
+		"object": {
+			"uuid": "31517222-A9A7-4EAF-B5F6-60751C0BABA3",
+			"type": "Scene",
+			"name": "Scene",
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+				{
+					"uuid": "EBBB1E63-6318-4752-AE2E-440A4E0B3EF3",
+					"type": "Mesh",
+					"name": "Ground",
+					"layers": 1,
+					"matrix": [1,0,0,0,0,0.000796,-1,0,0,1,0.000796,0,0,0,0,1],
+					"geometry": "BBEE74D1-E43D-4C32-A9F3-4656E78C26F3",
+					"material": "2F69AF3A-DDF5-4BBA-87B5-80159F90DDBF"
+				},
+				{
+					"uuid": "6EE2E764-43E0-48E0-85F2-E0C8823C20DC",
+					"type": "DirectionalLight",
+					"name": "DirectionalLight 1",
+					"layers": 1,
+					"matrix": [1,0,0,0,0,1,0,0,0,0,1,0,10,20,15,1],
+					"color": 16777215,
+					"intensity": 1,
+					"shadow": {
+						"camera": {
+							"uuid": "3BC010F7-9766-4087-BA04-1D4FD7721ABA",
+							"type": "OrthographicCamera",
+							"layers": 1,
+							"zoom": 1,
+							"left": -5,
+							"right": 5,
+							"top": 5,
+							"bottom": -5,
+							"near": 0.5,
+							"far": 500
+						}
+					}
+				},
+				{
+					"uuid": "38219749-1E67-45F2-AB15-E64BA0940CAD",
+					"type": "Mesh",
+					"name": "Brick",
+					"layers": 1,
+					"matrix": [1,0,0,0,0,1,0,0,0,0,1,0,0,0.5,0,1],
+					"geometry": "C1722F5F-89AD-45D8-B78C-D1D34AF2A012",
+					"material": "D98FC4D1-169E-420A-92EA-20E55009A46D",
+					"children": [
+						{
+							"uuid": "711A5955-8F17-4A8B-991A-7604D27E6FA0",
+							"type": "Mesh",
+							"name": "Cylinder",
+							"layers": 1,
+							"matrix": [0.000795,0.000795,1,0,-1.000001,-0.000001,0.000795,0,0.000001,-1.000001,0.000795,0,0,0,0,1],
+							"geometry": "327EFFCF-649C-4EF3-86D4-B422C5A86E89",
+							"material": "3B9DE64D-E1C8-4C24-9F73-3A9E10E3E655"
+						}]
+				},
+				{
+					"uuid": "18FFA67C-F893-4E7A-8A76-8D996DEBE0C6",
+					"type": "Mesh",
+					"name": "Ball",
+					"layers": 1,
+					"matrix": [1,0,0,0,0,1,0,0,0,0,1,0,0,0.5,3.55,1],
+					"geometry": "0791211B-BB02-4E57-82B5-64C05DE92B39",
+					"material": "043B208C-1F83-42C6-802C-E0E35621C27C"
+				},
+				{
+					"uuid": "6D660D49-39B8-40C3-95F6-E4E007AA8D79",
+					"type": "Mesh",
+					"name": "Paddle",
+					"layers": 1,
+					"matrix": [2,0,0,0,0,1,0,0,0,0,1,0,0,0.5,15.95,1],
+					"geometry": "73F12A47-9EA7-47FD-BCF3-89B8219B2626",
+					"material": "40EC9BDA-91C0-4671-937A-2BCB6DA7EEBB",
+					"children": [
+						{
+							"uuid": "4F5F884C-9E1B-45E6-8F1E-4D538A46D8CB",
+							"type": "Mesh",
+							"name": "Cylinder",
+							"layers": 1,
+							"matrix": [0.000795,0.000795,1,0,-1.000001,-0.000001,0.000795,0,0.000001,-1.000001,0.000795,0,0,0,0,1],
+							"geometry": "3BDEB9FB-BDD4-44AD-8A47-008BED1C8982",
+							"material": "3B9DE64D-E1C8-4C24-9F73-3A9E10E3E655"
+						}]
+				},
+				{
+					"uuid": "B0BEAF69-8B5D-4D87-ADCA-FDE83A02762D",
+					"type": "PointLight",
+					"name": "PointLight 2",
+					"layers": 1,
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+					"color": 16777215,
+					"intensity": 1,
+					"distance": 0,
+					"decay": 1,
+					"shadow": {
+						"camera": {
+							"uuid": "2F0DA21A-EFB8-4E9A-83C5-A601D6113780",
+							"type": "PerspectiveCamera",
+							"layers": 1,
+							"fov": 90,
+							"zoom": 1,
+							"near": 0.5,
+							"far": 500,
+							"focus": 10,
+							"aspect": 1,
+							"filmGauge": 35,
+							"filmOffset": 0
+						}
+					}
+				}],
+			"background": 11184810
+		}
+	},
+	"scripts": {
+		"6D660D49-39B8-40C3-95F6-E4E007AA8D79": [
+			{
+				"name": "User",
+				"source": "function pointermove( event ) {\n\n\tthis.position.x = ( event.clientX / player.width ) * 30 - 15;\n\n}\n\n// function update( event ) {}"
+			}],
+		"31517222-A9A7-4EAF-B5F6-60751C0BABA3": [
+			{
+				"name": "Game Logic",
+				"source": "var ball = this.getObjectByName( 'Ball' );\n\nvar direction = new THREE.Vector3();\ndirection.x = Math.random() - 0.5;\ndirection.z = - 0.5;\ndirection.normalize();\n\nvar speed = new THREE.Vector3();\n\n//\n\nvar group = new THREE.Group();\nthis.add( group );\n\nvar paddle = this.getObjectByName( 'Paddle' );\npaddle.material.visible = false;\ngroup.add( paddle );\n\nvar brick = this.getObjectByName( 'Brick' );\n\nfor ( var j = 0; j < 8; j ++ ) {\n\n\tvar material = new THREE.MeshPhongMaterial( { color: Math.random() * 0xffffff } );\n\n\tfor ( var i = 0; i < 12; i ++ ) {\n\t\t\n\t\tvar object = brick.clone();\n\t\tobject.position.x = i * 2.2 - 12;\n\t\tobject.position.z = j * 1.4 - 12;\n\t\tgroup.add( object );\n\n\t\tvar cylinder = object.getObjectByName( 'Cylinder' );\n\t\tcylinder.material = material;\n\n\t}\n\t\n}\n\nbrick.visible = false;\nbrick.material.visible = false;\n\n//\n\nvar raycaster = new THREE.Raycaster();\n\nfunction update( event ) {\n\t\n\tif ( ball.position.x < - 15 || ball.position.x > 15 ) direction.x = - direction.x;\n\tif ( ball.position.z < - 20 || ball.position.z > 20 ) direction.z = - direction.z;\n\n\tball.position.x = Math.max( - 15, Math.min( 15, ball.position.x ) );\n\tball.position.z = Math.max( - 20, Math.min( 20, ball.position.z ) );\n\t\t\n\traycaster.set( ball.position, direction );\n\t\n\tvar intersections = raycaster.intersectObjects( group.children );\n\t\n\tif ( intersections.length > 0 ) {\n\t\n\t\tvar intersection = intersections[ 0 ];\n\t\t\n\t\tif ( intersection.distance < 0.5 ) {\n\t\t\t\n\t\t\tif ( intersection.object !== paddle ) {\n\n\t\t\t\tgroup.remove( intersection.object );\n\t\t\t\t\n\t\t\t}\n\t\t\t\n\t\t\tdirection.reflect( intersection.face.normal );\n\t\t\t\n\t\t}\n\t\t\n\t}\n\n\tball.position.add( speed.copy( direction ).multiplyScalar( event.delta / 40 ) );\n\t\n}"
+			}]
+	}
+}

+{
+	"metadata": {
+		"type": "App"
+	},
+	"project": {
+		"shadows": true,
+		"vr": false
+	},
+	"camera": {
+		"metadata": {
+			"version": 4.5,
+			"type": "Object",
+			"generator": "Object3D.toJSON"
+		},
+		"object": {
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+			"type": "PerspectiveCamera",
+			"name": "Camera",
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+			"far": 100000,
+			"focus": 10,
+			"aspect": 1.428977,
+			"filmGauge": 35,
+			"filmOffset": 0
+		}
+	},
+	"scene": {
+		"metadata": {
+			"version": 4.5,
+			"type": "Object",
+			"generator": "Object3D.toJSON"
+		},
+		"geometries": [
+			{
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+				"type": "PlaneGeometry",
+				"width": 10,
+				"height": 10,
+				"widthSegments": 1,
+				"heightSegments": 1
+			},
+			{
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+				"height": 1,
+				"depth": 1,
+				"widthSegments": 1,
+				"heightSegments": 1,
+				"depthSegments": 1
+			},
+			{
+				"uuid": "F482ACD4-013A-49CF-AE0F-C9FF4ADAE409",
+				"type": "CylinderGeometry",
+				"radiusTop": 0,
+				"radiusBottom": 0.4,
+				"height": 0.75,
+				"radialSegments": 4,
+				"heightSegments": 1,
+				"openEnded": false
+			},
+			{
+				"uuid": "51CDDCED-BC71-4B1B-A485-725B6A48204B",
+				"type": "IcosahedronGeometry",
+				"radius": 0.4,
+				"detail": 2
+			}],
+		"materials": [
+			{
+				"uuid": "4AE8130E-B6A8-47BC-ACCF-060973C74044",
+				"type": "MeshPhongMaterial",
+				"color": 16777215,
+				"emissive": 0,
+				"specular": 1118481,
+				"shininess": 30,
+				"depthFunc": 3,
+				"depthTest": true,
+				"depthWrite": true
+			},
+			{
+				"uuid": "B5943856-E404-45D9-A427-4774202C2CD0",
+				"type": "MeshPhongMaterial",
+				"color": 37119,
+				"emissive": 0,
+				"specular": 1118481,
+				"shininess": 30,
+				"depthFunc": 3,
+				"depthTest": true,
+				"depthWrite": true
+			},
+			{
+				"uuid": "3F872310-2067-4BE4-9250-5B3F4E43797E",
+				"type": "MeshPhongMaterial",
+				"color": 15859456,
+				"emissive": 0,
+				"specular": 1118481,
+				"shininess": 30,
+				"depthFunc": 3,
+				"depthTest": true,
+				"depthWrite": true
+			},
+			{
+				"uuid": "E1826901-7922-4584-A25D-6D487E2C9BBD",
+				"type": "MeshPhongMaterial",
+				"color": 16711680,
+				"emissive": 0,
+				"specular": 1118481,
+				"shininess": 30,
+				"depthFunc": 3,
+				"depthTest": true,
+				"depthWrite": true
+			}],
+		"object": {
+			"uuid": "3741222A-BD8F-401C-A5D2-5A907E891896",
+			"type": "Scene",
+			"name": "Scene",
+			"layers": 1,
+			"matrix": [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],
+			"children": [
+				{
+					"uuid": "B7CBBC6F-EC26-49B5-8D0D-67D9C535924B",
+					"type": "Group",
+					"name": "Dummy",
+					"layers": 1,
+					"matrix": [1,0,0,0,0,1,0,0,0,0,1,0,0,1,4,1],
+					"children": [
+						{
+							"uuid": "60B69C58-4201-43FD-815E-AD2EDFBBD0CE",
+							"type": "PerspectiveCamera",
+							"name": "PerspectiveCamera",
+							"layers": 1,
+							"matrix": [-1,0,0,0,0,1,0,0,0,0,-1,0,0,0,0,1],
+							"fov": 50,
+							"zoom": 1,
+							"near": 0.1,
+							"far": 100,
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+}

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+			"children": [
+				{
+					"uuid": "FC7B6CF2-6386-4F47-9CE6-8ADB9FCA6E1F",
+					"type": "Mesh",
+					"name": "Icosahedron 1",
+					"layers": 1,
+					"matrix": [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],
+					"geometry": "EA781333-F3AE-470D-9110-A9724FCB42AA",
+					"material": "50ED51F1-DEA4-4B61-8082-BF41609E8C27"
+				}],
+			"background": 11184810
+		}
+	},
+	"scripts": {
+		"FC7B6CF2-6386-4F47-9CE6-8ADB9FCA6E1F": [
+			{
+				"name": "",
+				"source": "function update( event ) {\n\n\tthis.material.uniforms.time.value = event.time / 500.0;\n\n}"
+			}]
+	}
+}

+<?xml version="1.0" encoding="UTF-8"?>
+<svg version="1.1" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg">
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+</svg>

+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+	<title>3D Model Editor</title>
+	<meta charset="utf-8">
+	<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
+</head>
+
+<body>
+	<link rel="stylesheet" href="css/main.css">
+	<link rel="stylesheet" href="js/libs/codemirror/codemirror.css">
+	<link rel="stylesheet" href="js/libs/codemirror/theme/monokai.css">
+	<link rel="stylesheet" href="js/libs/codemirror/addon/dialog.css">
+	<link rel="stylesheet" href="js/libs/codemirror/addon/show-hint.css">
+	<link rel="stylesheet" href="js/libs/codemirror/addon/tern.css">
+
+	<script type="module" src="./jsm/libs/draco/draco_encoder.js"></script>
+	<script type="module" src="./js/libs/codemirror/codemirror.js"></script>
+	<script type="module" src="./js/libs/codemirror/mode/javascript.js"></script>
+	<script type="module" src="./js/libs/codemirror/mode/glsl.js"></script>
+	<script type="module" src="./js/libs/esprima.js"></script>
+	<script type="module" src="./js/libs/jsonlint.js"></script>
+	<script type="module" src="./js/libs/ffmpeg/ffmpeg.min.js"></script>
+	<script type="module" src="./js/libs/codemirror/addon/dialog.js"></script>
+	<script type="module" src="./js/libs/codemirror/addon/show-hint.js"></script>
+	<script type="module" src="./js/libs/codemirror/addon/tern.js"></script>
+	<script type="module" src="./js/libs/acorn/acorn.js"></script>
+	<script type="module" src="./js/libs/acorn/acorn_loose.js"></script>
+	<script type="module" src="./js/libs/acorn/walk.js"></script>
+	<script type="module" src="./js/libs/ternjs/polyfill.js"></script>
+	<script type="module" src="./js/libs/ternjs/signal.js"></script>
+	<script type="module" src="./js/libs/ternjs/tern.js"></script>
+	<script type="module" src="./js/libs/ternjs/def.js"></script>
+	<script type="module" src="./js/libs/ternjs/comment.js"></script>
+	<script type="module" src="./js/libs/ternjs/infer.js"></script>
+	<script type="module" src="./js/libs/ternjs/doc_comment.js"></script>
+	<script type="module" src="./js/libs/tern-threejs/threejs.js"></script>
+	<script type="module" src="./js/libs/signals.min.js"></script>
+
+	<script src="./main.js" type="module"></script>
+</body>
+
+</html>

+/**
+ * @param editor pointer to main editor object used to initialize
+ *        each command object with a reference to the editor
+ * @constructor
+ */
+
+class Command {
+
+	constructor( editor ) {
+
+		this.id = - 1;
+		this.inMemory = false;
+		this.updatable = false;
+		this.type = '';
+		this.name = '';
+		this.editor = editor;
+
+	}
+
+	toJSON() {
+
+		const output = {};
+		output.type = this.type;
+		output.id = this.id;
+		output.name = this.name;
+		return output;
+
+	}
+
+	fromJSON( json ) {
+
+		this.inMemory = true;
+		this.type = json.type;
+		this.id = json.id;
+		this.name = json.name;
+
+	}
+
+}
+
+export { Command };

+function Config() {
+
+	const name = 'threejs-editor';
+
+	const userLanguage = navigator.language.split( '-' )[ 0 ];
+
+	const suggestedLanguage = [ 'fr', 'ja', 'zh', 'ko' ].includes( userLanguage ) ? userLanguage : 'en';
+
+	const storage = {
+		'language': suggestedLanguage,
+
+		'autosave': true,
+
+		'project/title': '',
+		'project/editable': false,
+		'project/vr': false,
+
+		'project/renderer/antialias': true,
+		'project/renderer/shadows': true,
+		'project/renderer/shadowType': 1, // PCF
+		'project/renderer/toneMapping': 0, // NoToneMapping
+		'project/renderer/toneMappingExposure': 1,
+
+		'settings/history': false,
+
+		'settings/shortcuts/translate': 'w',
+		'settings/shortcuts/rotate': 'e',
+		'settings/shortcuts/scale': 'r',
+		'settings/shortcuts/undo': 'z',
+		'settings/shortcuts/focus': 'f'
+	};
+
+	if ( window.localStorage[ name ] === undefined ) {
+
+		window.localStorage[ name ] = JSON.stringify( storage );
+
+	} else {
+
+		const data = JSON.parse( window.localStorage[ name ] );
+
+		for ( const key in data ) {
+
+			storage[ key ] = data[ key ];
+
+		}
+
+	}
+
+	return {
+
+		getKey: function ( key ) {
+
+			return storage[ key ];
+
+		},
+
+		setKey: function () { // key, value, key, value ...
+
+			for ( let i = 0, l = arguments.length; i < l; i += 2 ) {
+
+				storage[ arguments[ i ] ] = arguments[ i + 1 ];
+
+			}
+
+			window.localStorage[ name ] = JSON.stringify( storage );
+
+			console.log( '[' + /\d\d\:\d\d\:\d\d/.exec( new Date() )[ 0 ] + ']', 'Saved config to LocalStorage.' );
+
+		},
+
+		clear: function () {
+
+			delete window.localStorage[ name ];
+
+		}
+
+	};
+
+}
+
+export { Config };

+import * as THREE from 'three';
+
+import { Config } from './Config.js';
+import { Loader } from './Loader.js';
+import { History as _History } from './History.js';
+import { Strings } from './Strings.js';
+import { Storage as _Storage } from './Storage.js';
+import { Selector } from './Selector.js';
+
+var _DEFAULT_CAMERA = new THREE.PerspectiveCamera( 50, 1, 0.01, 1000 );
+_DEFAULT_CAMERA.name = 'Camera';
+_DEFAULT_CAMERA.position.set( 0, 5, 10 );
+_DEFAULT_CAMERA.lookAt( new THREE.Vector3() );
+
+function Editor() {
+
+	const Signal = signals.Signal; // eslint-disable-line no-undef
+
+	this.signals = {
+
+		// script
+
+		editScript: new Signal(),
+
+		// player
+
+		startPlayer: new Signal(),
+		stopPlayer: new Signal(),
+
+		// xr
+
+		enterXR: new Signal(),
+		offerXR: new Signal(),
+		leaveXR: new Signal(),
+
+		// notifications
+
+		editorCleared: new Signal(),
+
+		savingStarted: new Signal(),
+		savingFinished: new Signal(),
+
+		transformModeChanged: new Signal(),
+		snapChanged: new Signal(),
+		spaceChanged: new Signal(),
+		rendererCreated: new Signal(),
+		rendererUpdated: new Signal(),
+		rendererDetectKTX2Support: new Signal(),
+
+		sceneBackgroundChanged: new Signal(),
+		sceneEnvironmentChanged: new Signal(),
+		sceneFogChanged: new Signal(),
+		sceneFogSettingsChanged: new Signal(),
+		sceneGraphChanged: new Signal(),
+		sceneRendered: new Signal(),
+
+		cameraChanged: new Signal(),
+		cameraResetted: new Signal(),
+
+		geometryChanged: new Signal(),
+
+		objectSelected: new Signal(),
+		objectFocused: new Signal(),
+
+		objectAdded: new Signal(),
+		objectChanged: new Signal(),
+		objectRemoved: new Signal(),
+
+		cameraAdded: new Signal(),
+		cameraRemoved: new Signal(),
+
+		helperAdded: new Signal(),
+		helperRemoved: new Signal(),
+
+		materialAdded: new Signal(),
+		materialChanged: new Signal(),
+		materialRemoved: new Signal(),
+
+		scriptAdded: new Signal(),
+		scriptChanged: new Signal(),
+		scriptRemoved: new Signal(),
+
+		windowResize: new Signal(),
+
+		showHelpersChanged: new Signal(),
+		refreshSidebarObject3D: new Signal(),
+		refreshSidebarEnvironment: new Signal(),
+		historyChanged: new Signal(),
+
+		viewportCameraChanged: new Signal(),
+		viewportShadingChanged: new Signal(),
+
+		intersectionsDetected: new Signal(),
+
+		pathTracerUpdated: new Signal(),
+
+	};
+
+	this.config = new Config();
+	this.history = new _History( this );
+	this.selector = new Selector( this );
+	this.storage = new _Storage();
+	this.strings = new Strings( this.config );
+
+	this.loader = new Loader( this );
+
+	this.camera = _DEFAULT_CAMERA.clone();
+
+	this.scene = new THREE.Scene();
+	this.scene.name = 'Scene';
+
+	this.sceneHelpers = new THREE.Scene();
+	this.sceneHelpers.add( new THREE.HemisphereLight( 0xffffff, 0x888888, 2 ) );
+
+	this.object = {};
+	this.geometries = {};
+	this.materials = {};
+	this.textures = {};
+	this.scripts = {};
+
+	this.materialsRefCounter = new Map(); // tracks how often is a material used by a 3D object
+
+	this.mixer = new THREE.AnimationMixer( this.scene );
+
+	this.selected = null;
+	this.helpers = {};
+
+	this.cameras = {};
+
+	this.viewportCamera = this.camera;
+	this.viewportShading = 'default';
+
+	this.addCamera( this.camera );
+
+}
+
+Editor.prototype = {
+
+	setScene: function ( scene ) {
+
+		this.scene.uuid = scene.uuid;
+		this.scene.name = scene.name;
+
+		this.scene.background = scene.background;
+		this.scene.environment = scene.environment;
+		this.scene.fog = scene.fog;
+		this.scene.backgroundBlurriness = scene.backgroundBlurriness;
+		this.scene.backgroundIntensity = scene.backgroundIntensity;
+
+		this.scene.userData = JSON.parse( JSON.stringify( scene.userData ) );
+
+		// avoid render per object
+
+		this.signals.sceneGraphChanged.active = false;
+
+		while ( scene.children.length > 0 ) {
+
+			this.addObject( scene.children[ 0 ] );
+
+		}
+
+		this.signals.sceneGraphChanged.active = true;
+		this.signals.sceneGraphChanged.dispatch();
+
+	},
+
+	//
+
+	addObject: function ( object, parent, index ) {
+
+		var scope = this;
+
+		object.traverse( function ( child ) {
+
+			if ( child.geometry !== undefined ) scope.addGeometry( child.geometry );
+			if ( child.material !== undefined ) scope.addMaterial( child.material );
+
+			scope.addCamera( child );
+			scope.addHelper( child );
+
+		} );
+
+		if ( parent === undefined ) {
+
+			this.scene.add( object );
+
+		} else {
+
+			parent.children.splice( index, 0, object );
+			object.parent = parent;
+
+		}
+
+		this.signals.objectAdded.dispatch( object );
+		this.signals.sceneGraphChanged.dispatch();
+
+	},
+
+	nameObject: function ( object, name ) {
+
+		object.name = name;
+		this.signals.sceneGraphChanged.dispatch();
+
+	},
+
+	removeObject: function ( object ) {
+
+		if ( object.parent === null ) return; // avoid deleting the camera or scene
+
+		var scope = this;
+
+		object.traverse( function ( child ) {
+
+			scope.removeCamera( child );
+			scope.removeHelper( child );
+
+			if ( child.material !== undefined ) scope.removeMaterial( child.material );
+
+		} );
+
+		object.parent.remove( object );
+
+		this.signals.objectRemoved.dispatch( object );
+		this.signals.sceneGraphChanged.dispatch();
+
+	},
+
+	addGeometry: function ( geometry ) {
+
+		this.geometries[ geometry.uuid ] = geometry;
+
+	},
+
+	setGeometryName: function ( geometry, name ) {
+
+		geometry.name = name;
+		this.signals.sceneGraphChanged.dispatch();
+
+	},
+
+	addMaterial: function ( material ) {
+
+		if ( Array.isArray( material ) ) {
+
+			for ( var i = 0, l = material.length; i < l; i ++ ) {
+
+				this.addMaterialToRefCounter( material[ i ] );
+
+			}
+
+		} else {
+
+			this.addMaterialToRefCounter( material );
+
+		}
+
+		this.signals.materialAdded.dispatch();
+
+	},
+
+	addMaterialToRefCounter: function ( material ) {
+
+		var materialsRefCounter = this.materialsRefCounter;
+
+		var count = materialsRefCounter.get( material );
+
+		if ( count === undefined ) {
+
+			materialsRefCounter.set( material, 1 );
+			this.materials[ material.uuid ] = material;
+
+		} else {
+
+			count ++;
+			materialsRefCounter.set( material, count );
+
+		}
+
+	},
+
+	removeMaterial: function ( material ) {
+
+		if ( Array.isArray( material ) ) {
+
+			for ( var i = 0, l = material.length; i < l; i ++ ) {
+
+				this.removeMaterialFromRefCounter( material[ i ] );
+
+			}
+
+		} else {
+
+			this.removeMaterialFromRefCounter( material );
+
+		}
+
+		this.signals.materialRemoved.dispatch();
+
+	},
+
+	removeMaterialFromRefCounter: function ( material ) {
+
+		var materialsRefCounter = this.materialsRefCounter;
+
+		var count = materialsRefCounter.get( material );
+		count --;
+
+		if ( count === 0 ) {
+
+			materialsRefCounter.delete( material );
+			delete this.materials[ material.uuid ];
+
+		} else {
+
+			materialsRefCounter.set( material, count );
+
+		}
+
+	},
+
+	getMaterialById: function ( id ) {
+
+		var material;
+		var materials = Object.values( this.materials );
+
+		for ( var i = 0; i < materials.length; i ++ ) {
+
+			if ( materials[ i ].id === id ) {
+
+				material = materials[ i ];
+				break;
+
+			}
+
+		}
+
+		return material;
+
+	},
+
+	setMaterialName: function ( material, name ) {
+
+		material.name = name;
+		this.signals.sceneGraphChanged.dispatch();
+
+	},
+
+	addTexture: function ( texture ) {
+
+		this.textures[ texture.uuid ] = texture;
+
+	},
+
+	//
+
+	addCamera: function ( camera ) {
+
+		if ( camera.isCamera ) {
+
+			this.cameras[ camera.uuid ] = camera;
+
+			this.signals.cameraAdded.dispatch( camera );
+
+		}
+
+	},
+
+	removeCamera: function ( camera ) {
+
+		if ( this.cameras[ camera.uuid ] !== undefined ) {
+
+			delete this.cameras[ camera.uuid ];
+
+			this.signals.cameraRemoved.dispatch( camera );
+
+		}
+
+	},
+
+	//
+
+	addHelper: function () {
+
+		var geometry = new THREE.SphereGeometry( 2, 4, 2 );
+		var material = new THREE.MeshBasicMaterial( { color: 0xff0000, visible: false } );
+
+		return function ( object, helper ) {
+
+			if ( helper === undefined ) {
+
+				if ( object.isCamera ) {
+
+					helper = new THREE.CameraHelper( object );
+
+				} else if ( object.isPointLight ) {
+
+					helper = new THREE.PointLightHelper( object, 1 );
+
+				} else if ( object.isDirectionalLight ) {
+
+					helper = new THREE.DirectionalLightHelper( object, 1 );
+
+				} else if ( object.isSpotLight ) {
+
+					helper = new THREE.SpotLightHelper( object );
+
+				} else if ( object.isHemisphereLight ) {
+
+					helper = new THREE.HemisphereLightHelper( object, 1 );
+
+				} else if ( object.isSkinnedMesh ) {
+
+					helper = new THREE.SkeletonHelper( object.skeleton.bones[ 0 ] );
+
+				} else if ( object.isBone === true && object.parent && object.parent.isBone !== true ) {
+
+					helper = new THREE.SkeletonHelper( object );
+
+				} else {
+
+					// no helper for this object type
+					return;
+
+				}
+
+				const picker = new THREE.Mesh( geometry, material );
+				picker.name = 'picker';
+				picker.userData.object = object;
+				helper.add( picker );
+
+			}
+
+			this.sceneHelpers.add( helper );
+			this.helpers[ object.id ] = helper;
+
+			this.signals.helperAdded.dispatch( helper );
+
+		};
+
+	}(),
+
+	removeHelper: function ( object ) {
+
+		if ( this.helpers[ object.id ] !== undefined ) {
+
+			var helper = this.helpers[ object.id ];
+			helper.parent.remove( helper );
+			helper.dispose();
+
+			delete this.helpers[ object.id ];
+
+			this.signals.helperRemoved.dispatch( helper );
+
+		}
+
+	},
+
+	//
+
+	addScript: function ( object, script ) {
+
+		if ( this.scripts[ object.uuid ] === undefined ) {
+
+			this.scripts[ object.uuid ] = [];
+
+		}
+
+		this.scripts[ object.uuid ].push( script );
+
+		this.signals.scriptAdded.dispatch( script );
+
+	},
+
+	removeScript: function ( object, script ) {
+
+		if ( this.scripts[ object.uuid ] === undefined ) return;
+
+		var index = this.scripts[ object.uuid ].indexOf( script );
+
+		if ( index !== - 1 ) {
+
+			this.scripts[ object.uuid ].splice( index, 1 );
+
+		}
+
+		this.signals.scriptRemoved.dispatch( script );
+
+	},
+
+	getObjectMaterial: function ( object, slot ) {
+
+		var material = object.material;
+
+		if ( Array.isArray( material ) && slot !== undefined ) {
+
+			material = material[ slot ];
+
+		}
+
+		return material;
+
+	},
+
+	setObjectMaterial: function ( object, slot, newMaterial ) {
+
+		if ( Array.isArray( object.material ) && slot !== undefined ) {
+
+			object.material[ slot ] = newMaterial;
+
+		} else {
+
+			object.material = newMaterial;
+
+		}
+
+	},
+
+	setViewportCamera: function ( uuid ) {
+
+		this.viewportCamera = this.cameras[ uuid ];
+		this.signals.viewportCameraChanged.dispatch();
+
+	},
+
+	setViewportShading: function ( value ) {
+
+		this.viewportShading = value;
+		this.signals.viewportShadingChanged.dispatch();
+
+	},
+
+	//
+
+	select: function ( object ) {
+
+		this.selector.select( object );
+
+	},
+
+	selectById: function ( id ) {
+
+		if ( id === this.camera.id ) {
+
+			this.select( this.camera );
+			return;
+
+		}
+
+		this.select( this.scene.getObjectById( id ) );
+
+	},
+
+	selectByUuid: function ( uuid ) {
+
+		var scope = this;
+
+		this.scene.traverse( function ( child ) {
+
+			if ( child.uuid === uuid ) {
+
+				scope.select( child );
+
+			}
+
+		} );
+
+	},
+
+	deselect: function () {
+
+		this.selector.deselect();
+
+	},
+
+	focus: function ( object ) {
+
+		if ( object !== undefined ) {
+
+			this.signals.objectFocused.dispatch( object );
+
+		}
+
+	},
+
+	focusById: function ( id ) {
+
+		this.focus( this.scene.getObjectById( id ) );
+
+	},
+
+	clear: function () {
+
+		this.history.clear();
+		this.storage.clear();
+
+		this.camera.copy( _DEFAULT_CAMERA );
+		this.signals.cameraResetted.dispatch();
+
+		this.scene.name = 'Scene';
+		this.scene.userData = {};
+		this.scene.background = null;
+		this.scene.environment = null;
+		this.scene.fog = null;
+
+		var objects = this.scene.children;
+
+		this.signals.sceneGraphChanged.active = false;
+
+		while ( objects.length > 0 ) {
+
+			this.removeObject( objects[ 0 ] );
+
+		}
+
+		this.signals.sceneGraphChanged.active = true;
+
+		this.geometries = {};
+		this.materials = {};
+		this.textures = {};
+		this.scripts = {};
+
+		this.materialsRefCounter.clear();
+
+		this.animations = {};
+		this.mixer.stopAllAction();
+
+		this.deselect();
+
+		this.signals.editorCleared.dispatch();
+
+	},
+
+	//
+
+	fromJSON: async function ( json ) {
+
+		var loader = new THREE.ObjectLoader();
+		var camera = await loader.parseAsync( json.camera );
+
+		const existingUuid = this.camera.uuid;
+		const incomingUuid = camera.uuid;
+
+		// copy all properties, including uuid
+		this.camera.copy( camera );
+		this.camera.uuid = incomingUuid;
+
+		delete this.cameras[ existingUuid ]; // remove old entry [existingUuid, this.camera]
+		this.cameras[ incomingUuid ] = this.camera; // add new entry [incomingUuid, this.camera]
+
+		this.signals.cameraResetted.dispatch();
+
+		this.history.fromJSON( json.history );
+		this.scripts = json.scripts;
+
+		this.setScene( await loader.parseAsync( json.scene ) );
+
+		if ( json.environment === 'ModelViewer' ) {
+
+			this.signals.sceneEnvironmentChanged.dispatch( json.environment );
+			this.signals.refreshSidebarEnvironment.dispatch();
+
+		}
+
+	},
+
+	toJSON: function () {
+
+		// scripts clean up
+
+		var scene = this.scene;
+		var scripts = this.scripts;
+
+		for ( var key in scripts ) {
+
+			var script = scripts[ key ];
+
+			if ( script.length === 0 || scene.getObjectByProperty( 'uuid', key ) === undefined ) {
+
+				delete scripts[ key ];
+
+			}
+
+		}
+
+		// honor modelviewer environment
+
+		let environment = null;
+
+		if ( this.scene.environment !== null && this.scene.environment.isRenderTargetTexture === true ) {
+
+			environment = 'ModelViewer';
+
+		}
+
+		//
+
+		return {
+
+			metadata: {},
+			project: {
+				shadows: this.config.getKey( 'project/renderer/shadows' ),
+				shadowType: this.config.getKey( 'project/renderer/shadowType' ),
+				toneMapping: this.config.getKey( 'project/renderer/toneMapping' ),
+				toneMappingExposure: this.config.getKey( 'project/renderer/toneMappingExposure' )
+			},
+			camera: this.viewportCamera.toJSON(),
+			scene: this.scene.toJSON(),
+			scripts: this.scripts,
+			history: this.history.toJSON(),
+			environment: environment
+
+		};
+
+	},
+
+	objectByUuid: function ( uuid ) {
+
+		return this.scene.getObjectByProperty( 'uuid', uuid, true );
+
+	},
+
+	execute: function ( cmd, optionalName ) {
+
+		this.history.execute( cmd, optionalName );
+
+	},
+
+	undo: function () {
+
+		this.history.undo();
+
+	},
+
+	redo: function () {
+
+		this.history.redo();
+
+	},
+
+	utils: {
+
+		save: save,
+		saveArrayBuffer: saveArrayBuffer,
+		saveString: saveString,
+		formatNumber: formatNumber
+
+	}
+
+};
+
+const link = document.createElement( 'a' );
+
+function save( blob, filename ) {
+
+	if ( link.href ) {
+
+		URL.revokeObjectURL( link.href );
+
+	}
+
+	link.href = URL.createObjectURL( blob );
+	link.download = filename || 'data.json';
+	link.dispatchEvent( new MouseEvent( 'click' ) );
+
+}
+
+function saveArrayBuffer( buffer, filename ) {
+
+	save( new Blob( [ buffer ], { type: 'application/octet-stream' } ), filename );
+
+}
+
+function saveString( text, filename ) {
+
+	save( new Blob( [ text ], { type: 'text/plain' } ), filename );
+
+}
+
+function formatNumber( number ) {
+
+	return new Intl.NumberFormat( 'en-us', { useGrouping: true } ).format( number );
+
+}
+
+export { Editor };

+import * as THREE from 'three';
+
+class EditorControls extends THREE.EventDispatcher {
+
+	constructor( object, domElement ) {
+
+		super();
+
+		// API
+
+		this.enabled = true;
+		this.center = new THREE.Vector3();
+		this.panSpeed = 0.002;
+		this.zoomSpeed = 0.1;
+		this.rotationSpeed = 0.005;
+
+		// internals
+
+		var scope = this;
+		var vector = new THREE.Vector3();
+		var delta = new THREE.Vector3();
+		var box = new THREE.Box3();
+
+		var STATE = { NONE: - 1, ROTATE: 0, ZOOM: 1, PAN: 2 };
+		var state = STATE.NONE;
+
+		var center = this.center;
+		var normalMatrix = new THREE.Matrix3();
+		var pointer = new THREE.Vector2();
+		var pointerOld = new THREE.Vector2();
+		var spherical = new THREE.Spherical();
+		var sphere = new THREE.Sphere();
+
+		var pointers = [];
+		var pointerPositions = {};
+
+		// events
+
+		var changeEvent = { type: 'change' };
+
+		this.focus = function ( target ) {
+
+			var distance;
+
+			box.setFromObject( target );
+
+			if ( box.isEmpty() === false ) {
+
+				box.getCenter( center );
+				distance = box.getBoundingSphere( sphere ).radius;
+
+			} else {
+
+				// Focusing on an Group, AmbientLight, etc
+
+				center.setFromMatrixPosition( target.matrixWorld );
+				distance = 0.1;
+
+			}
+
+			delta.set( 0, 0, 1 );
+			delta.applyQuaternion( object.quaternion );
+			delta.multiplyScalar( distance * 4 );
+
+			object.position.copy( center ).add( delta );
+
+			scope.dispatchEvent( changeEvent );
+
+		};
+
+		this.pan = function ( delta ) {
+
+			var distance = object.position.distanceTo( center );
+
+			delta.multiplyScalar( distance * scope.panSpeed );
+			delta.applyMatrix3( normalMatrix.getNormalMatrix( object.matrix ) );
+
+			object.position.add( delta );
+			center.add( delta );
+
+			scope.dispatchEvent( changeEvent );
+
+		};
+
+		this.zoom = function ( delta ) {
+
+			var distance = object.position.distanceTo( center );
+
+			delta.multiplyScalar( distance * scope.zoomSpeed );
+
+			if ( delta.length() > distance ) return;
+
+			delta.applyMatrix3( normalMatrix.getNormalMatrix( object.matrix ) );
+
+			object.position.add( delta );
+
+			scope.dispatchEvent( changeEvent );
+
+		};
+
+		this.rotate = function ( delta ) {
+
+			vector.copy( object.position ).sub( center );
+
+			spherical.setFromVector3( vector );
+
+			spherical.theta += delta.x * scope.rotationSpeed;
+			spherical.phi += delta.y * scope.rotationSpeed;
+
+			spherical.makeSafe();
+
+			vector.setFromSpherical( spherical );
+
+			object.position.copy( center ).add( vector );
+
+			object.lookAt( center );
+
+			scope.dispatchEvent( changeEvent );
+
+		};
+
+		//
+
+		function onPointerDown( event ) {
+
+			if ( scope.enabled === false ) return;
+
+			if ( pointers.length === 0 ) {
+
+				domElement.setPointerCapture( event.pointerId );
+
+				domElement.ownerDocument.addEventListener( 'pointermove', onPointerMove );
+				domElement.ownerDocument.addEventListener( 'pointerup', onPointerUp );
+
+			}
+
+			//
+
+			if ( isTrackingPointer( event ) ) return;
+
+			//
+
+			addPointer( event );
+
+			if ( event.pointerType === 'touch' ) {
+
+				onTouchStart( event );
+
+			} else {
+
+				onMouseDown( event );
+
+			}
+
+		}
+
+		function onPointerMove( event ) {
+
+			if ( scope.enabled === false ) return;
+
+			if ( event.pointerType === 'touch' ) {
+
+				onTouchMove( event );
+
+			} else {
+
+				onMouseMove( event );
+
+			}
+
+		}
+
+		function onPointerUp( event ) {
+
+			removePointer( event );
+
+			switch ( pointers.length ) {
+
+				case 0:
+
+					domElement.releasePointerCapture( event.pointerId );
+
+					domElement.ownerDocument.removeEventListener( 'pointermove', onPointerMove );
+					domElement.ownerDocument.removeEventListener( 'pointerup', onPointerUp );
+
+					break;
+
+				case 1:
+
+					var pointerId = pointers[ 0 ];
+					var position = pointerPositions[ pointerId ];
+
+					// minimal placeholder event - allows state correction on pointer-up
+					onTouchStart( { pointerId: pointerId, pageX: position.x, pageY: position.y } );
+
+					break;
+
+			}
+
+		}
+
+		// mouse
+
+		function onMouseDown( event ) {
+
+			if ( event.button === 0 ) {
+
+				state = STATE.ROTATE;
+
+			} else if ( event.button === 1 ) {
+
+				state = STATE.ZOOM;
+
+			} else if ( event.button === 2 ) {
+
+				state = STATE.PAN;
+
+			}
+
+			pointerOld.set( event.clientX, event.clientY );
+
+		}
+
+		function onMouseMove( event ) {
+
+			pointer.set( event.clientX, event.clientY );
+
+			var movementX = pointer.x - pointerOld.x;
+			var movementY = pointer.y - pointerOld.y;
+
+			if ( state === STATE.ROTATE ) {
+
+				scope.rotate( delta.set( - movementX, - movementY, 0 ) );
+
+			} else if ( state === STATE.ZOOM ) {
+
+				scope.zoom( delta.set( 0, 0, movementY ) );
+
+			} else if ( state === STATE.PAN ) {
+
+				scope.pan( delta.set( - movementX, movementY, 0 ) );
+
+			}
+
+			pointerOld.set( event.clientX, event.clientY );
+
+		}
+
+		function onMouseUp() {
+
+			state = STATE.NONE;
+
+		}
+
+		function onMouseWheel( event ) {
+
+			if ( scope.enabled === false ) return;
+
+			event.preventDefault();
+
+			// Normalize deltaY due to https://bugzilla.mozilla.org/show_bug.cgi?id=1392460
+			scope.zoom( delta.set( 0, 0, event.deltaY > 0 ? 1 : - 1 ) );
+
+		}
+
+		function contextmenu( event ) {
+
+			event.preventDefault();
+
+		}
+
+		this.dispose = function () {
+
+			domElement.removeEventListener( 'contextmenu', contextmenu );
+			domElement.removeEventListener( 'dblclick', onMouseUp );
+			domElement.removeEventListener( 'wheel', onMouseWheel );
+
+			domElement.removeEventListener( 'pointerdown', onPointerDown );
+
+		};
+
+		domElement.addEventListener( 'contextmenu', contextmenu );
+		domElement.addEventListener( 'dblclick', onMouseUp );
+		domElement.addEventListener( 'wheel', onMouseWheel, { passive: false } );
+
+		domElement.addEventListener( 'pointerdown', onPointerDown );
+
+		// touch
+
+		var touches = [ new THREE.Vector3(), new THREE.Vector3(), new THREE.Vector3() ];
+		var prevTouches = [ new THREE.Vector3(), new THREE.Vector3(), new THREE.Vector3() ];
+
+		var prevDistance = null;
+
+		function onTouchStart( event ) {
+
+			trackPointer( event );
+
+			switch ( pointers.length ) {
+
+				case 1:
+					touches[ 0 ].set( event.pageX, event.pageY, 0 ).divideScalar( window.devicePixelRatio );
+					touches[ 1 ].set( event.pageX, event.pageY, 0 ).divideScalar( window.devicePixelRatio );
+					break;
+
+				case 2:
+
+					var position = getSecondPointerPosition( event );
+
+					touches[ 0 ].set( event.pageX, event.pageY, 0 ).divideScalar( window.devicePixelRatio );
+					touches[ 1 ].set( position.x, position.y, 0 ).divideScalar( window.devicePixelRatio );
+					prevDistance = touches[ 0 ].distanceTo( touches[ 1 ] );
+					break;
+
+			}
+
+			prevTouches[ 0 ].copy( touches[ 0 ] );
+			prevTouches[ 1 ].copy( touches[ 1 ] );
+
+		}
+
+
+		function onTouchMove( event ) {
+
+			trackPointer( event );
+
+			function getClosest( touch, touches ) {
+
+				var closest = touches[ 0 ];
+
+				for ( var touch2 of touches ) {
+
+					if ( closest.distanceTo( touch ) > touch2.distanceTo( touch ) ) closest = touch2;
+
+				}
+
+				return closest;
+
+			}
+
+			switch ( pointers.length ) {
+
+				case 1:
+					touches[ 0 ].set( event.pageX, event.pageY, 0 ).divideScalar( window.devicePixelRatio );
+					touches[ 1 ].set( event.pageX, event.pageY, 0 ).divideScalar( window.devicePixelRatio );
+					scope.rotate( touches[ 0 ].sub( getClosest( touches[ 0 ], prevTouches ) ).multiplyScalar( - 1 ) );
+					break;
+
+				case 2:
+
+					var position = getSecondPointerPosition( event );
+
+					touches[ 0 ].set( event.pageX, event.pageY, 0 ).divideScalar( window.devicePixelRatio );
+					touches[ 1 ].set( position.x, position.y, 0 ).divideScalar( window.devicePixelRatio );
+					var distance = touches[ 0 ].distanceTo( touches[ 1 ] );
+					scope.zoom( delta.set( 0, 0, prevDistance - distance ) );
+					prevDistance = distance;
+
+
+					var offset0 = touches[ 0 ].clone().sub( getClosest( touches[ 0 ], prevTouches ) );
+					var offset1 = touches[ 1 ].clone().sub( getClosest( touches[ 1 ], prevTouches ) );
+					offset0.x = - offset0.x;
+					offset1.x = - offset1.x;
+
+					scope.pan( offset0.add( offset1 ) );
+
+					break;
+
+			}
+
+			prevTouches[ 0 ].copy( touches[ 0 ] );
+			prevTouches[ 1 ].copy( touches[ 1 ] );
+
+		}
+
+		function addPointer( event ) {
+
+			pointers.push( event.pointerId );
+
+		}
+
+		function removePointer( event ) {
+
+			delete pointerPositions[ event.pointerId ];
+
+			for ( var i = 0; i < pointers.length; i ++ ) {
+
+				if ( pointers[ i ] == event.pointerId ) {
+
+					pointers.splice( i, 1 );
+					return;
+
+				}
+
+			}
+
+		}
+
+		function isTrackingPointer( event ) {
+
+			for ( var i = 0; i < pointers.length; i ++ ) {
+
+				if ( pointers[ i ] == event.pointerId ) return true;
+
+			}
+
+			return false;
+
+		}
+
+		function trackPointer( event ) {
+
+			var position = pointerPositions[ event.pointerId ];
+
+			if ( position === undefined ) {
+
+				position = new THREE.Vector2();
+				pointerPositions[ event.pointerId ] = position;
+
+			}
+
+			position.set( event.pageX, event.pageY );
+
+		}
+
+		function getSecondPointerPosition( event ) {
+
+			var pointerId = ( event.pointerId === pointers[ 0 ] ) ? pointers[ 1 ] : pointers[ 0 ];
+
+			return pointerPositions[ pointerId ];
+
+		}
+
+	}
+
+}
+
+export { EditorControls };

+import * as Commands from './commands/Commands.js';
+
+class History {
+
+	constructor( editor ) {
+
+		this.editor = editor;
+		this.undos = [];
+		this.redos = [];
+		this.lastCmdTime = Date.now();
+		this.idCounter = 0;
+
+		this.historyDisabled = false;
+		this.config = editor.config;
+
+		// signals
+
+		const scope = this;
+
+		this.editor.signals.startPlayer.add( function () {
+
+			scope.historyDisabled = true;
+
+		} );
+
+		this.editor.signals.stopPlayer.add( function () {
+
+			scope.historyDisabled = false;
+
+		} );
+
+	}
+
+	execute( cmd, optionalName ) {
+
+		const lastCmd = this.undos[ this.undos.length - 1 ];
+		const timeDifference = Date.now() - this.lastCmdTime;
+
+		const isUpdatableCmd = lastCmd &&
+			lastCmd.updatable &&
+			cmd.updatable &&
+			lastCmd.object === cmd.object &&
+			lastCmd.type === cmd.type &&
+			lastCmd.script === cmd.script &&
+			lastCmd.attributeName === cmd.attributeName;
+
+		if ( isUpdatableCmd && cmd.type === 'SetScriptValueCommand' ) {
+
+			// When the cmd.type is "SetScriptValueCommand" the timeDifference is ignored
+
+			lastCmd.update( cmd );
+			cmd = lastCmd;
+
+		} else if ( isUpdatableCmd && timeDifference < 500 ) {
+
+			lastCmd.update( cmd );
+			cmd = lastCmd;
+
+		} else {
+
+			// the command is not updatable and is added as a new part of the history
+
+			this.undos.push( cmd );
+			cmd.id = ++ this.idCounter;
+
+		}
+
+		cmd.name = ( optionalName !== undefined ) ? optionalName : cmd.name;
+		cmd.execute();
+		cmd.inMemory = true;
+
+		if ( this.config.getKey( 'settings/history' ) ) {
+
+			cmd.json = cmd.toJSON();	// serialize the cmd immediately after execution and append the json to the cmd
+
+		}
+
+		this.lastCmdTime = Date.now();
+
+		// clearing all the redo-commands
+
+		this.redos = [];
+		this.editor.signals.historyChanged.dispatch( cmd );
+
+	}
+
+	undo() {
+
+		if ( this.historyDisabled ) {
+
+			alert( this.editor.strings.getKey( 'prompt/history/forbid' ) );
+			return;
+
+		}
+
+		let cmd = undefined;
+
+		if ( this.undos.length > 0 ) {
+
+			cmd = this.undos.pop();
+
+			if ( cmd.inMemory === false ) {
+
+				cmd.fromJSON( cmd.json );
+
+			}
+
+		}
+
+		if ( cmd !== undefined ) {
+
+			cmd.undo();
+			this.redos.push( cmd );
+			this.editor.signals.historyChanged.dispatch( cmd );
+
+		}
+
+		return cmd;
+
+	}
+
+	redo() {
+
+		if ( this.historyDisabled ) {
+
+			alert( this.editor.strings.getKey( 'prompt/history/forbid' ) );
+			return;
+
+		}
+
+		let cmd = undefined;
+
+		if ( this.redos.length > 0 ) {
+
+			cmd = this.redos.pop();
+
+			if ( cmd.inMemory === false ) {
+
+				cmd.fromJSON( cmd.json );
+
+			}
+
+		}
+
+		if ( cmd !== undefined ) {
+
+			cmd.execute();
+			this.undos.push( cmd );
+			this.editor.signals.historyChanged.dispatch( cmd );
+
+		}
+
+		return cmd;
+
+	}
+
+	toJSON() {
+
+		const history = {};
+		history.undos = [];
+		history.redos = [];
+
+		if ( ! this.config.getKey( 'settings/history' ) ) {
+
+			return history;
+
+		}
+
+		// Append Undos to History
+
+		for ( let i = 0; i < this.undos.length; i ++ ) {
+
+			if ( this.undos[ i ].hasOwnProperty( 'json' ) ) {
+
+				history.undos.push( this.undos[ i ].json );
+
+			}
+
+		}
+
+		// Append Redos to History
+
+		for ( let i = 0; i < this.redos.length; i ++ ) {
+
+			if ( this.redos[ i ].hasOwnProperty( 'json' ) ) {
+
+				history.redos.push( this.redos[ i ].json );
+
+			}
+
+		}
+
+		return history;
+
+	}
+
+	fromJSON( json ) {
+
+		if ( json === undefined ) return;
+
+		for ( let i = 0; i < json.undos.length; i ++ ) {
+
+			const cmdJSON = json.undos[ i ];
+			const cmd = new Commands[ cmdJSON.type ]( this.editor ); // creates a new object of type "json.type"
+			cmd.json = cmdJSON;
+			cmd.id = cmdJSON.id;
+			cmd.name = cmdJSON.name;
+			this.undos.push( cmd );
+			this.idCounter = ( cmdJSON.id > this.idCounter ) ? cmdJSON.id : this.idCounter; // set last used idCounter
+
+		}
+
+		for ( let i = 0; i < json.redos.length; i ++ ) {
+
+			const cmdJSON = json.redos[ i ];
+			const cmd = new Commands[ cmdJSON.type ]( this.editor ); // creates a new object of type "json.type"
+			cmd.json = cmdJSON;
+			cmd.id = cmdJSON.id;
+			cmd.name = cmdJSON.name;
+			this.redos.push( cmd );
+			this.idCounter = ( cmdJSON.id > this.idCounter ) ? cmdJSON.id : this.idCounter; // set last used idCounter
+
+		}
+
+		// Select the last executed undo-command
+		this.editor.signals.historyChanged.dispatch( this.undos[ this.undos.length - 1 ] );
+
+	}
+
+	clear() {
+
+		this.undos = [];
+		this.redos = [];
+		this.idCounter = 0;
+
+		this.editor.signals.historyChanged.dispatch();
+
+	}
+
+	goToState( id ) {
+
+		if ( this.historyDisabled ) {
+
+			alert( this.editor.strings.getKey( 'prompt/history/forbid' ) );
+			return;
+
+		}
+
+		this.editor.signals.sceneGraphChanged.active = false;
+		this.editor.signals.historyChanged.active = false;
+
+		let cmd = this.undos.length > 0 ? this.undos[ this.undos.length - 1 ] : undefined;	// next cmd to pop
+
+		if ( cmd === undefined || id > cmd.id ) {
+
+			cmd = this.redo();
+			while ( cmd !== undefined && id > cmd.id ) {
+
+				cmd = this.redo();
+
+			}
+
+		} else {
+
+			while ( true ) {
+
+				cmd = this.undos[ this.undos.length - 1 ];	// next cmd to pop
+
+				if ( cmd === undefined || id === cmd.id ) break;
+
+				this.undo();
+
+			}
+
+		}
+
+		this.editor.signals.sceneGraphChanged.active = true;
+		this.editor.signals.historyChanged.active = true;
+
+		this.editor.signals.sceneGraphChanged.dispatch();
+		this.editor.signals.historyChanged.dispatch( cmd );
+
+	}
+
+	enableSerialization( id ) {
+
+		/**
+		 * because there might be commands in this.undos and this.redos
+		 * which have not been serialized with .toJSON() we go back
+		 * to the oldest command and redo one command after the other
+		 * while also calling .toJSON() on them.
+		 */
+
+		this.goToState( - 1 );
+
+		this.editor.signals.sceneGraphChanged.active = false;
+		this.editor.signals.historyChanged.active = false;
+
+		let cmd = this.redo();
+		while ( cmd !== undefined ) {
+
+			if ( ! cmd.hasOwnProperty( 'json' ) ) {
+
+				cmd.json = cmd.toJSON();
+
+			}
+
+			cmd = this.redo();
+
+		}
+
+		this.editor.signals.sceneGraphChanged.active = true;
+		this.editor.signals.historyChanged.active = true;
+
+		this.goToState( id );
+
+	}
+
+}
+
+export { History };

+import * as THREE from 'three';
+
+import { TGALoader } from 'three/addons/loaders/TGALoader.js';
+
+import { AddObjectCommand } from './commands/AddObjectCommand.js';
+
+import { LoaderUtils } from './LoaderUtils.js';
+
+import { unzipSync, strFromU8 } from 'three/addons/libs/fflate.module.js';
+
+function Loader( editor ) {
+
+	const scope = this;
+
+	this.texturePath = '';
+
+	this.loadItemList = function ( items ) {
+
+		LoaderUtils.getFilesFromItemList( items, function ( files, filesMap ) {
+
+			scope.loadFiles( files, filesMap );
+
+		} );
+
+	};
+
+	this.loadFiles = function ( files, filesMap ) {
+
+		if ( files.length > 0 ) {
+
+			filesMap = filesMap || LoaderUtils.createFilesMap( files );
+
+			const manager = new THREE.LoadingManager();
+			manager.setURLModifier( function ( url ) {
+
+				url = url.replace( /^(\.?\/)/, '' ); // remove './'
+
+				const file = filesMap[ url ];
+
+				if ( file ) {
+
+					console.log( 'Loading', url );
+
+					return URL.createObjectURL( file );
+
+				}
+
+				return url;
+
+			} );
+
+			manager.addHandler( /\.tga$/i, new TGALoader() );
+
+			for ( let i = 0; i < files.length; i ++ ) {
+
+				scope.loadFile( files[ i ], manager );
+
+			}
+
+		}
+
+	};
+
+	this.loadFile = function ( file, manager ) {
+
+		const filename = file.name;
+		const extension = filename.split( '.' ).pop().toLowerCase();
+
+		const reader = new FileReader();
+		reader.addEventListener( 'progress', function ( event ) {
+
+			const size = '(' + editor.utils.formatNumber( Math.floor( event.total / 1000 ) ) + ' KB)';
+			const progress = Math.floor( ( event.loaded / event.total ) * 100 ) + '%';
+
+			console.log( 'Loading', filename, size, progress );
+
+		} );
+
+		switch ( extension ) {
+
+			case '3dm':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { Rhino3dmLoader } = await import( 'three/addons/loaders/3DMLoader.js' );
+
+					const loader = new Rhino3dmLoader();
+					loader.setLibraryPath( '../examples/jsm/libs/rhino3dm/' );
+					loader.parse( contents, function ( object ) {
+
+						object.name = filename;
+
+						editor.execute( new AddObjectCommand( editor, object ) );
+
+					}, function ( error ) {
+
+						console.error( error );
+
+					} );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case '3ds':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const { TDSLoader } = await import( 'three/addons/loaders/TDSLoader.js' );
+
+					const loader = new TDSLoader();
+					const object = loader.parse( event.target.result );
+
+					editor.execute( new AddObjectCommand( editor, object ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case '3mf':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const { ThreeMFLoader } = await import( 'three/addons/loaders/3MFLoader.js' );
+
+					const loader = new ThreeMFLoader();
+					const object = loader.parse( event.target.result );
+
+					editor.execute( new AddObjectCommand( editor, object ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'amf':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const { AMFLoader } = await import( 'three/addons/loaders/AMFLoader.js' );
+
+					const loader = new AMFLoader();
+					const amfobject = loader.parse( event.target.result );
+
+					editor.execute( new AddObjectCommand( editor, amfobject ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'dae':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { ColladaLoader } = await import( 'three/addons/loaders/ColladaLoader.js' );
+
+					const loader = new ColladaLoader( manager );
+					const collada = loader.parse( contents );
+
+					collada.scene.name = filename;
+
+					editor.execute( new AddObjectCommand( editor, collada.scene ) );
+
+				}, false );
+				reader.readAsText( file );
+
+				break;
+
+			}
+
+			case 'drc':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { DRACOLoader } = await import( 'three/addons/loaders/DRACOLoader.js' );
+
+					const loader = new DRACOLoader();
+					loader.setDecoderPath( '../examples/jsm/libs/draco/' );
+					loader.parse( contents, function ( geometry ) {
+
+						let object;
+
+						if ( geometry.index !== null ) {
+
+							const material = new THREE.MeshStandardMaterial();
+
+							object = new THREE.Mesh( geometry, material );
+							object.name = filename;
+
+						} else {
+
+							const material = new THREE.PointsMaterial( { size: 0.01 } );
+							material.vertexColors = geometry.hasAttribute( 'color' );
+
+							object = new THREE.Points( geometry, material );
+							object.name = filename;
+
+						}
+
+						loader.dispose();
+						editor.execute( new AddObjectCommand( editor, object ) );
+
+					} );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'fbx':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { FBXLoader } = await import( 'three/addons/loaders/FBXLoader.js' );
+
+					const loader = new FBXLoader( manager );
+					const object = loader.parse( contents );
+
+					editor.execute( new AddObjectCommand( editor, object ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'glb':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const loader = await createGLTFLoader();
+
+					loader.parse( contents, '', function ( result ) {
+
+						const scene = result.scene;
+						scene.name = filename;
+
+						scene.animations.push( ...result.animations );
+						editor.execute( new AddObjectCommand( editor, scene ) );
+
+						loader.dracoLoader.dispose();
+						loader.ktx2Loader.dispose();
+
+					} );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'gltf':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const loader = await createGLTFLoader( manager );
+
+					loader.parse( contents, '', function ( result ) {
+
+						const scene = result.scene;
+						scene.name = filename;
+
+						scene.animations.push( ...result.animations );
+						editor.execute( new AddObjectCommand( editor, scene ) );
+
+						loader.dracoLoader.dispose();
+						loader.ktx2Loader.dispose();
+
+					} );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'js':
+			case 'json':
+
+			{
+
+				reader.addEventListener( 'load', function ( event ) {
+
+					const contents = event.target.result;
+
+					// 2.0
+
+					if ( contents.indexOf( 'postMessage' ) !== - 1 ) {
+
+						const blob = new Blob( [ contents ], { type: 'text/javascript' } );
+						const url = URL.createObjectURL( blob );
+
+						const worker = new Worker( url );
+
+						worker.onmessage = function ( event ) {
+
+							event.data.metadata = { version: 2 };
+							handleJSON( event.data );
+
+						};
+
+						worker.postMessage( Date.now() );
+
+						return;
+
+					}
+
+					// >= 3.0
+
+					let data;
+
+					try {
+
+						data = JSON.parse( contents );
+
+					} catch ( error ) {
+
+						alert( error );
+						return;
+
+					}
+
+					handleJSON( data );
+
+				}, false );
+				reader.readAsText( file );
+
+				break;
+
+			}
+
+			case 'kmz':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const { KMZLoader } = await import( 'three/addons/loaders/KMZLoader.js' );
+
+					const loader = new KMZLoader();
+					const collada = loader.parse( event.target.result );
+
+					collada.scene.name = filename;
+
+					editor.execute( new AddObjectCommand( editor, collada.scene ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'ldr':
+			case 'mpd':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const { LDrawLoader } = await import( 'three/addons/loaders/LDrawLoader.js' );
+
+					const loader = new LDrawLoader();
+					loader.setPath( '../../examples/models/ldraw/officialLibrary/' );
+					loader.parse( event.target.result, function ( group ) {
+
+						group.name = filename;
+						// Convert from LDraw coordinates: rotate 180 degrees around OX
+						group.rotation.x = Math.PI;
+
+						editor.execute( new AddObjectCommand( editor, group ) );
+
+					} );
+
+				}, false );
+				reader.readAsText( file );
+
+				break;
+
+			}
+
+			case 'md2':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { MD2Loader } = await import( 'three/addons/loaders/MD2Loader.js' );
+
+					const geometry = new MD2Loader().parse( contents );
+					const material = new THREE.MeshStandardMaterial();
+
+					const mesh = new THREE.Mesh( geometry, material );
+					mesh.mixer = new THREE.AnimationMixer( mesh );
+					mesh.name = filename;
+
+					mesh.animations.push( ...geometry.animations );
+					editor.execute( new AddObjectCommand( editor, mesh ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'obj':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { OBJLoader } = await import( 'three/addons/loaders/OBJLoader.js' );
+
+					const object = new OBJLoader().parse( contents );
+					object.name = filename;
+
+					editor.execute( new AddObjectCommand( editor, object ) );
+
+				}, false );
+				reader.readAsText( file );
+
+				break;
+
+			}
+
+			case 'pcd':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { PCDLoader } = await import( 'three/addons/loaders/PCDLoader.js' );
+
+					const points = new PCDLoader().parse( contents );
+					points.name = filename;
+
+					editor.execute( new AddObjectCommand( editor, points ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'ply':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { PLYLoader } = await import( 'three/addons/loaders/PLYLoader.js' );
+
+					const geometry = new PLYLoader().parse( contents );
+					let object;
+
+					if ( geometry.index !== null ) {
+
+						const material = new THREE.MeshStandardMaterial();
+
+						object = new THREE.Mesh( geometry, material );
+						object.name = filename;
+
+					} else {
+
+						const material = new THREE.PointsMaterial( { size: 0.01 } );
+						material.vertexColors = geometry.hasAttribute( 'color' );
+
+						object = new THREE.Points( geometry, material );
+						object.name = filename;
+
+					}
+
+					editor.execute( new AddObjectCommand( editor, object ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'stl':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { STLLoader } = await import( 'three/addons/loaders/STLLoader.js' );
+
+					const geometry = new STLLoader().parse( contents );
+					const material = new THREE.MeshStandardMaterial();
+
+					const mesh = new THREE.Mesh( geometry, material );
+					mesh.name = filename;
+
+					editor.execute( new AddObjectCommand( editor, mesh ) );
+
+				}, false );
+
+				if ( reader.readAsBinaryString !== undefined ) {
+
+					reader.readAsBinaryString( file );
+
+				} else {
+
+					reader.readAsArrayBuffer( file );
+
+				}
+
+				break;
+
+			}
+
+			case 'svg':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { SVGLoader } = await import( 'three/addons/loaders/SVGLoader.js' );
+
+					const loader = new SVGLoader();
+					const paths = loader.parse( contents ).paths;
+
+					//
+
+					const group = new THREE.Group();
+					group.name = filename;
+					group.scale.multiplyScalar( 0.1 );
+					group.scale.y *= - 1;
+
+					for ( let i = 0; i < paths.length; i ++ ) {
+
+						const path = paths[ i ];
+
+						const material = new THREE.MeshBasicMaterial( {
+							color: path.color,
+							depthWrite: false
+						} );
+
+						const shapes = SVGLoader.createShapes( path );
+
+						for ( let j = 0; j < shapes.length; j ++ ) {
+
+							const shape = shapes[ j ];
+
+							const geometry = new THREE.ShapeGeometry( shape );
+							const mesh = new THREE.Mesh( geometry, material );
+
+							group.add( mesh );
+
+						}
+
+					}
+
+					editor.execute( new AddObjectCommand( editor, group ) );
+
+				}, false );
+				reader.readAsText( file );
+
+				break;
+
+			}
+
+			case 'usdz':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { USDZLoader } = await import( 'three/addons/loaders/USDZLoader.js' );
+
+					const group = new USDZLoader().parse( contents );
+					group.name = filename;
+
+					editor.execute( new AddObjectCommand( editor, group ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'vox':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { VOXLoader, VOXMesh } = await import( 'three/addons/loaders/VOXLoader.js' );
+
+					const chunks = new VOXLoader().parse( contents );
+
+					const group = new THREE.Group();
+					group.name = filename;
+
+					for ( let i = 0; i < chunks.length; i ++ ) {
+
+						const chunk = chunks[ i ];
+
+						const mesh = new VOXMesh( chunk );
+						group.add( mesh );
+
+					}
+
+					editor.execute( new AddObjectCommand( editor, group ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'vtk':
+			case 'vtp':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { VTKLoader } = await import( 'three/addons/loaders/VTKLoader.js' );
+
+					const geometry = new VTKLoader().parse( contents );
+					const material = new THREE.MeshStandardMaterial();
+
+					const mesh = new THREE.Mesh( geometry, material );
+					mesh.name = filename;
+
+					editor.execute( new AddObjectCommand( editor, mesh ) );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			case 'wrl':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { VRMLLoader } = await import( 'three/addons/loaders/VRMLLoader.js' );
+
+					const result = new VRMLLoader().parse( contents );
+
+					editor.execute( new AddObjectCommand( editor, result ) );
+
+				}, false );
+				reader.readAsText( file );
+
+				break;
+
+			}
+
+			case 'xyz':
+
+			{
+
+				reader.addEventListener( 'load', async function ( event ) {
+
+					const contents = event.target.result;
+
+					const { XYZLoader } = await import( 'three/addons/loaders/XYZLoader.js' );
+
+					const geometry = new XYZLoader().parse( contents );
+
+					const material = new THREE.PointsMaterial();
+					material.vertexColors = geometry.hasAttribute( 'color' );
+
+					const points = new THREE.Points( geometry, material );
+					points.name = filename;
+
+					editor.execute( new AddObjectCommand( editor, points ) );
+
+				}, false );
+				reader.readAsText( file );
+
+				break;
+
+			}
+
+			case 'zip':
+
+			{
+
+				reader.addEventListener( 'load', function ( event ) {
+
+					handleZIP( event.target.result );
+
+				}, false );
+				reader.readAsArrayBuffer( file );
+
+				break;
+
+			}
+
+			default:
+
+				console.error( 'Unsupported file format (' + extension + ').' );
+
+				break;
+
+		}
+
+	};
+
+	function handleJSON( data ) {
+
+		if ( data.metadata === undefined ) { // 2.0
+
+			data.metadata = { type: 'Geometry' };
+
+		}
+
+		if ( data.metadata.type === undefined ) { // 3.0
+
+			data.metadata.type = 'Geometry';
+
+		}
+
+		if ( data.metadata.formatVersion !== undefined ) {
+
+			data.metadata.version = data.metadata.formatVersion;
+
+		}
+
+		switch ( data.metadata.type.toLowerCase() ) {
+
+			case 'buffergeometry':
+
+			{
+
+				const loader = new THREE.BufferGeometryLoader();
+				const result = loader.parse( data );
+
+				const mesh = new THREE.Mesh( result );
+
+				editor.execute( new AddObjectCommand( editor, mesh ) );
+
+				break;
+
+			}
+
+			case 'geometry':
+
+				console.error( 'Loader: "Geometry" is no longer supported.' );
+
+				break;
+
+			case 'object':
+
+			{
+
+				const loader = new THREE.ObjectLoader();
+				loader.setResourcePath( scope.texturePath );
+
+				loader.parse( data, function ( result ) {
+
+					editor.execute( new AddObjectCommand( editor, result ) );
+
+				} );
+
+				break;
+
+			}
+
+			case 'app':
+
+				editor.fromJSON( data );
+
+				break;
+
+		}
+
+	}
+
+	async function handleZIP( contents ) {
+
+		const zip = unzipSync( new Uint8Array( contents ) );
+
+		const manager = new THREE.LoadingManager();
+		manager.setURLModifier( function ( url ) {
+
+			const file = zip[ url ];
+
+			if ( file ) {
+
+				console.log( 'Loading', url );
+
+				const blob = new Blob( [ file.buffer ], { type: 'application/octet-stream' } );
+				return URL.createObjectURL( blob );
+
+			}
+
+			return url;
+
+		} );
+
+		// Poly
+
+		if ( zip[ 'model.obj' ] && zip[ 'materials.mtl' ] ) {
+
+			const { MTLLoader } = await import( 'three/addons/loaders/MTLLoader.js' );
+			const { OBJLoader } = await import( 'three/addons/loaders/OBJLoader.js' );
+
+			const materials = new MTLLoader( manager ).parse( strFromU8( zip[ 'materials.mtl' ] ) );
+			const object = new OBJLoader().setMaterials( materials ).parse( strFromU8( zip[ 'model.obj' ] ) );
+
+			editor.execute( new AddObjectCommand( editor, object ) );
+			return;
+
+		}
+
+		//
+
+		for ( const path in zip ) {
+
+			const file = zip[ path ];
+
+			const extension = path.split( '.' ).pop().toLowerCase();
+
+			switch ( extension ) {
+
+				case 'fbx':
+
+				{
+
+					const { FBXLoader } = await import( 'three/addons/loaders/FBXLoader.js' );
+
+					const loader = new FBXLoader( manager );
+					const object = loader.parse( file.buffer );
+
+					editor.execute( new AddObjectCommand( editor, object ) );
+
+					break;
+
+				}
+
+				case 'glb':
+
+				{
+
+					const loader = await createGLTFLoader();
+
+					loader.parse( file.buffer, '', function ( result ) {
+
+						const scene = result.scene;
+
+						scene.animations.push( ...result.animations );
+						editor.execute( new AddObjectCommand( editor, scene ) );
+
+						loader.dracoLoader.dispose();
+						loader.ktx2Loader.dispose();
+
+					} );
+
+					break;
+
+				}
+
+				case 'gltf':
+
+				{
+
+					const loader = await createGLTFLoader( manager );
+
+					loader.parse( strFromU8( file ), '', function ( result ) {
+
+						const scene = result.scene;
+
+						scene.animations.push( ...result.animations );
+						editor.execute( new AddObjectCommand( editor, scene ) );
+
+						loader.dracoLoader.dispose();
+						loader.ktx2Loader.dispose();
+
+					} );
+
+					break;
+
+				}
+
+			}
+
+		}
+
+	}
+
+	async function createGLTFLoader( manager ) {
+
+		const { GLTFLoader } = await import( 'three/addons/loaders/GLTFLoader.js' );
+		const { DRACOLoader } = await import( 'three/addons/loaders/DRACOLoader.js' );
+		const { KTX2Loader } = await import( 'three/addons/loaders/KTX2Loader.js' );
+		const { MeshoptDecoder } = await import( 'three/addons/libs/meshopt_decoder.module.js' );
+
+		const dracoLoader = new DRACOLoader();
+		dracoLoader.setDecoderPath( '../examples/jsm/libs/draco/gltf/' );
+
+		const ktx2Loader = new KTX2Loader( manager );
+		ktx2Loader.setTranscoderPath( '../examples/jsm/libs/basis/' );
+
+		editor.signals.rendererDetectKTX2Support.dispatch( ktx2Loader );
+
+		const loader = new GLTFLoader( manager );
+		loader.setDRACOLoader( dracoLoader );
+		loader.setKTX2Loader( ktx2Loader );
+		loader.setMeshoptDecoder( MeshoptDecoder );
+
+		return loader;
+
+	}
+
+}
+
+export { Loader };

+const LoaderUtils = {
+
+	createFilesMap: function ( files ) {
+
+		const map = {};
+
+		for ( let i = 0; i < files.length; i ++ ) {
+
+			const file = files[ i ];
+			map[ file.name ] = file;
+
+		}
+
+		return map;
+
+	},
+
+	getFilesFromItemList: function ( items, onDone ) {
+
+		// TOFIX: setURLModifier() breaks when the file being loaded is not in root
+
+		let itemsCount = 0;
+		let itemsTotal = 0;
+
+		const files = [];
+		const filesMap = {};
+
+		function onEntryHandled() {
+
+			itemsCount ++;
+
+			if ( itemsCount === itemsTotal ) {
+
+				onDone( files, filesMap );
+
+			}
+
+		}
+
+		function handleEntry( entry ) {
+
+			if ( entry.isDirectory ) {
+
+				const reader = entry.createReader();
+				reader.readEntries( function ( entries ) {
+
+					for ( let i = 0; i < entries.length; i ++ ) {
+
+						handleEntry( entries[ i ] );
+
+					}
+
+					onEntryHandled();
+
+				} );
+
+			} else if ( entry.isFile ) {
+
+				entry.file( function ( file ) {
+
+					files.push( file );
+
+					filesMap[ entry.fullPath.slice( 1 ) ] = file;
+					onEntryHandled();
+
+				} );
+
+			}
+
+			itemsTotal ++;
+
+		}
+
+		for ( let i = 0; i < items.length; i ++ ) {
+
+			const item = items[ i ];
+
+			if ( item.kind === 'file' ) {
+
+				handleEntry( item.webkitGetAsEntry() );
+
+			}
+
+		}
+
+	}
+
+};
+
+export { LoaderUtils };