Portal camera

buttons

by jmcjc5u

HTML

<div id="info">Box
  <br>
  <button id="toggle" style="width:20%">Toggle Camera</button>
  <canvas id='mycanvas' style="width:100vh;height:100vh"></canvas>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/104/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js">
</script>
<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
<script src="https://jyunming-chen.github.io/tutsplus/js/KeyboardState.js"></script>

CSS

#info {
  position: absolute;
  top: 2%;
  width: 100%;
  padding: 10px;
  text-align: center;
  color: #ffff00
}

body {
  overflow: hidden;
}

JavaScript

var scene, renderer, camera, acamera;
var L, near;
var actingCamera;
var cameraSphere;
var keyboard;

init();
animate();

$("#toggle").click(function() {
	if (actingCamera === camera) {
  	actingCamera = acamera;
  } else
  	actingCamera = camera;
});


function init() {
  L = 30;
  near = L/2;
	keyboard = new KeyboardState();
  
	scene = new THREE.Scene();
  let cc = document.getElementById('mycanvas');
  renderer = new THREE.WebGLRenderer({canvas:cc});
  let size = $('#mycanvas').innerHeight();
  console.log ('size' + size)
  renderer.setSize(size,size);
  renderer.setClearColor(0x888888);
  document.body.appendChild(renderer.domElement);

  camera = new THREE.PerspectiveCamera(90,1, 1, 1000);
  camera.position.z = near;
  let controls = new THREE.OrbitControls(camera, renderer.domElement);
  
	acamera = new THREE.PerspectiveCamera ();
  acamera.position.set (0,0,near);
  makePerspective();
	actingCamera = acamera;
  
  cameraSphere = new THREE.Mesh (new THREE.SphereGeometry (2,20,20), new THREE.MeshNormalMaterial())
  scene.add (cameraSphere);
  
	///////////////
	let grid = new THREE.GridHelper (L, 10, 'white', 'white');  
  let grid0 = grid.clone();
  grid0.position.set (0, L/2, -L/2);
  scene.add (grid0);
  let grid1 = grid.clone();
  grid1.position.set (0, -L/2, -L/2);
  scene.add (grid1);

	let grid2 = grid.clone();
  grid2.position.set (L/2, 0, -L/2);
  grid2.rotation.z = Math.PI/2;
  scene.add (grid2);
  
	let grid3 = grid.clone();
  grid3.position.set (-L/2, 0, -L/2);
  grid3.rotation.z = Math.PI/2;
  scene.add (grid3);

	let grid4 = grid.clone();
  grid4.position.set (0, 0, -L);
  grid4.rotation.x = Math.PI/2;
  scene.add (grid4);

	let axes = new THREE.AxesHelper (10);
  scene.add (axes);
}

function makePerspective() {
	// set parameters
  let x = acamera.position.x;
  let y = acamera.position.y;
  
	let left = -(L/2+x);
  let right = L/2-x;
  let top = L/2-y;
  let bottom = -(L/2+y);
  let far = near + L;
 ...