Threejs - Groups

HTML

<script src="https://rawgit.com/mrdoob/three.js/dev/build/three.js"></script>
<script src="https://rawgit.com/mrdoob/three.js/dev/examples/js/controls/OrbitControls.js"></script>

CSS

/* fix mouse click offset errors when doing drags */
body {
  margin: 0;
}

JavaScript

class Main {
	constructor(){
    this.objects = []; 
    this.scene = new THREE.Scene();
    
    var width = window.innerWidth;
    var height = window.innerHeight * .75;
    this.camera = new THREE.PerspectiveCamera( 
    	35, width/height, 0.1, 1000 
    );
    
    this.renderer = new THREE.WebGLRenderer();
    
    
    this.renderer.setSize( width, height );
    this.renderer.setClearColor( 0xcccccc, 1 ); 
    
    // controls should set 2nd param or mouse move will be all over the main dom element
    // null on 2nd param, threejs will use the parent as the mouse click and prevent default
    this.controls = new THREE.OrbitControls(this.camera, this.renderer.domElement);
    
    // will turn off zooming while panning with right mouse click, false by default
    this.controls.screenSpacePanning = true;
    
    document.body.appendChild( this.renderer.domElement );
    this.scene.add(this.camera);

    
    this.setToFullOrbit(this.controls);
    this.camera.position.copy(new THREE.Vector3(10,10,10));
    // fix first frame render issue going invisible
    this.camera.lookAt(new THREE.Vector3(0,0,0));

    var axisHelper = new THREE.AxisHelper();
    this.scene.add(axisHelper);
    
    this.group = new THREE.Group();
    this.group.applyMatrix(new THREE.Matrix4().makeTranslation(0,2,0));
    this.group.position.x += 5;
    this.scene.add(this.group);
    
    var grid = new THREE.GridHelper();
    this.scene.add(grid);

		this.createScene();
    
   	this.fps = 5;
    this.currentFrame = 0;
    this.canAnimate = false;

  }
  
  createScene(){
  
  	var s1 = Utils.createSphere();
    this.group.add(s1);
    
    var s2 = Utils.createSphere();
    this.group.add(s2);
    s2.position.x += 4;
    
    var s3 = Utils.createSphere();
    this.group.add(s3);
    s3.position.x += 2;
    
    // rotating the group happens in the render
    
    var btn = document.createElement('button');
    btn.innerHTML = 'Play';
    btn.addEventListener('click', (e) => {
     ...