ortho resize

with orbitControls, XZgrid, info

by jmcjc5u

HTML

<div id="info">Orthographic Resize
</div>
<script src="http://cdnjs.cloudflare.com/ajax/libs/three.js/84/three.min.js"></script>

CSS

#info {
  position: absolute;
  top: 0px;
  width: 100%;
  padding: 10px;
  text-align: center;
  color: #ffff00
}

body {
  overflow: hidden;
}

JavaScript

var camera, scene, renderer;

init();
animate();

function init() {
    renderer = new THREE.WebGLRenderer({
      antialias: true
    });
  
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.setClearColor(0x888888);
  document.body.appendChild(renderer.domElement);

	whRatio = window.innerWidth/window.innerHeight
	halfH = 20;
  halfW = halfH*whRatio
  
  scene = new THREE.Scene();
  camera = new THREE.OrthographicCamera(-halfW, halfW, halfH, -halfH, -10, 100);
  camera.position.z = 10;

  /////////////////////////////////////////////////////////
	let circle = new THREE.Mesh (new THREE.CircleGeometry (10,30), new THREE.MeshBasicMaterial())
  scene.add (circle)
  
  window.addEventListener('resize', onWindowResize, false);
}

function onWindowResize() {
	whRatio = window.innerWidth/window.innerHeight;
	halfH = 20;
  halfW = halfH*whRatio
	
  camera.left = -halfW; camera.right = halfW;
  camera.top = halfH; camera.bottom = -halfH;
  camera.updateProjectionMatrix();
	
  renderer.setSize(window.innerWidth, window.innerHeight);
}

function animate() {
  requestAnimationFrame(animate);
  render();
}

function render() {
  renderer.render(scene, camera);
}