extend Element for a Cube class

js/Cube.js

@@ -0,0 +1,12 @@
+import { Element } from "./Element.js";
+
+export class Cube extends Element {
+    constructor() {
+        super();
+
+        this.data = new THREE.Mesh(
+            new THREE.BoxGeometry(1, 1, 1),
+            new THREE.MeshBasicMaterial({ color: 0x00ff00 })
+        );
+    }
+}

js/Element.js

@@ -1,16 +1,15 @@
 export class Element {
     constructor() {
-        this.data = new THREE.Mesh(
+        this.data = undefined;
-            new THREE.BoxGeometry(1, 1, 1),
-            new THREE.MeshBasicMaterial({ color: 0x00ff00 })
-        );
     }
 
     /**
      * Rotate the element
      */
     rotate = () => {
-        this.data.rotation.x += 0.01;
+        if (this.data) {
-        this.data.rotation.y += 0.01;
+            this.data.rotation.x += 0.01;
+            this.data.rotation.y += 0.01;
+        }
     };
 }