feat(All):Initial

packages/sdk/lib/core/commands/AddObjectCommand.ts

@@ -0,0 +1,49 @@
+import { Command } from './Command';
+import { ObjectLoader } from '../loader/ObjectLoader';
+import App from "../app/App";
+
+/**
+ * @param object THREE.Object3D
+ * @constructor
+ */
+class AddObjectCommand extends Command {
+	public object;
+
+	constructor( object ) {
+		super();
+
+		this.type = 'AddObjectCommand';
+		this.object = object;
+		if ( object !== undefined ) {
+			this.name = `Add object`;
+		}
+	}
+
+	execute() {
+		App.addObject(this.object);
+		App.select(this.object);
+	}
+
+	undo() {
+		App.removeObject( this.object );
+		App.deselect();
+	}
+
+	toJSON() {
+		const output = super.toJSON();
+		output.object = this.object.toJSON();
+		return output;
+	}
+
+	fromJSON( json ) {
+		super.fromJSON( json );
+		this.object = App.getObjectByUuid( json.object.object.uuid );
+
+		if ( this.object === undefined ) {
+			const loader = new ObjectLoader();
+			this.object = loader.parse( json.object );
+		}
+	}
+}
+
+export { AddObjectCommand };