Threejs - Camera AutoFit

by black strings

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>
<!--
  /**
   * corrects gl transparency rendering issues when no decking and framing is selected
   * the lower the number, the higher the priority to be rendered first
   */
  public static readonly RENDER_ORDER_DECK_FLOOR = new DeckDefaults(15);

  /**
   * corrects gl transparency rendering issues when no decking and framing is selected
   * the lower the number, the higher the priority to be rendered first
   */
  public static readonly RENDER_ORDER_FRAMING = new DeckDefaults(10);
  
  -->

CSS

body {
  margin:0;
}

JavaScript

var objects = []; 
var scene = new THREE.Scene();

var width = window.innerWidth;
var height = window.innerHeight / 1.2;

var camera = new THREE.PerspectiveCamera( 35, width/height, 0.1, 10000 );
var renderer = new THREE.WebGLRenderer();

renderer.setSize( width, height );
renderer.setClearColor( 0xcccccc, 1 ); 
document.body.appendChild( renderer.domElement );
scene.add(camera);

controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.screenSpacePanning = true;
setToFullOrbit(controls)
camera.position.copy(new THREE.Vector3(fti(5), fti(5), fti(5)) );
// fix first frame render issue going invisible
camera.lookAt(new THREE.Vector3(0,0,0));

var axisHelper = new THREE.AxisHelper();
scene.add(axisHelper);

var grid = new THREE.GridHelper(fti(12), 12);
scene.add(grid);

// ----- playground starts here ----------------- //

var geo = new THREE.BoxGeometry(3,3, 3);
var mesh = new THREE.Mesh(geo);
scene.add(mesh);

var btn = document.createElement('button');
btn.innerHTML = 'zoom';
document.body.appendChild(btn);
btn.addEventListener('click', () => {
	fitCameraToObject(camera, mesh, 12);
  controls.update();	// if camera is transformed manually, must call update to sync up
});

var v1 = new THREE.Vector3();

// ---- end of playground ---------------------- //

function createLine(points, color){
	color = color || 0xff0000;
	var geo = new THREE.Geometry();
  geo.vertices.push(...points);
  var line = new THREE.Line(geo, new THREE.LineBasicMaterial({color: color}));
  scene.add(line);
  console.warn('line addded');
}

function createSphere(size){
	var mesh = new THREE.Mesh(new THREE.SphereGeometry(size,10,10));
	scene.add(mesh);
  return mesh;
}

function createShape(color) {
	// ---- playground here
  var points = [
    new THREE.Vector2(-2,0),
    new THREE.Vector2(-1,1),
    new THREE.Vector2(1,1),
    new THREE.Vector2(2,0)
  ];
  var shape = new THREE.Shape(points);
  var geo = new THREE.ShapeGeometry(shape);
  var mesh = new THREE.Mesh(geo, new...