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              <canvas></canvas>
<div class="vignette"></div>
<h1><em>Click to toggle from </em><span class='ortho active'>Orthographic Camera</span><em> to</em> <span class="persp">Perspective Camera</span></h1>
            
          
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              body {
  overflow: hidden;
  margin: 0;
  cursor: pointer;
  width: 100vw;
  height: 100vh;
}
canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height:100%;
}

.vignette {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, rgba(0,0,0,0) 0%,rgba(0,0,0,0) 60%, rgba(0,0,0,0.1) 100%);
  background-size: 100% 100%;
}


h1 {
  position: absolute;
  left: 0;
  bottom: 20px;
  width: 100%;
  text-align: center;
  color: white;
  font-family: 'Pompiere', cursive;
  font-size: 16px;
  em, span {
    font-style:normal;
    opacity: 0.5;
    transition: 0.3s ease-out;
  }
  .active {
    font-size: 1.2em;
    opacity: 0.8;
  }
}
            
          
!
            
              var ww = window.innerWidth,
    wh = window.innerHeight;

var renderer = new THREE.WebGLRenderer({
  canvas: document.querySelector('canvas'),
  antialias: true
});
renderer.setPixelRatio(window.devicePixelRatio > 1 ? 2 : 1);
renderer.setSize(ww, wh);
renderer.setClearColor(0x8cc6b0);

var scene = new THREE.Scene();

var triangle = new THREE.Object3D();
scene.add(triangle);

var orthographicCamera = new THREE.OrthographicCamera( ww / - 2, ww / 2, wh / 2, wh / - 2, 1, 5000 );
orthographicCamera.position.set(1000, 1000, 1000);
orthographicCamera.lookAt(new THREE.Vector3(0,0,0));

var perspectiveCamera = new THREE.PerspectiveCamera( 45, ww / wh, 1, 5000 );
perspectiveCamera.position.set(900, 900, 900);
perspectiveCamera.lookAt(new THREE.Vector3(0,0,0));

var cube = 80;
if(ww < 1000) {
  cube = 40;
}
var mat = new THREE.MeshLambertMaterial({
  color:0xffffff
});

var geom = new THREE.BoxGeometry(cube * 5, cube, cube);
var mesh = new THREE.Mesh(geom, mat);
triangle.add(mesh);

var geom = new THREE.BoxGeometry(cube, cube, cube * 5);
var mesh = new THREE.Mesh(geom, mat);
mesh.position.x = cube * 2.5;
mesh.position.z = cube * 2;
triangle.add(mesh);

var geom = new THREE.BoxGeometry(cube, cube * 5.5, cube);
var mesh = new THREE.Mesh(geom, mat);
mesh.position.x = cube * 3;
mesh.position.y = cube * 2.75;
mesh.position.z = cube * 5;
triangle.add(mesh);

var geometry = new THREE.PlaneGeometry( cube, cube, cube );
var plane = new THREE.Mesh( geometry, mat );
plane.position.set(cube * 4.75, cube * 5.75, cube * 6.25)
triangle.add( plane );

var geometry = new THREE.PlaneGeometry( cube, cube, cube );
var mat = new THREE.MeshBasicMaterial({color:0xffa774})
var plane = new THREE.Mesh( geometry, mat );
plane.position.set(cube * 4.75, cube * 6.75, cube * 6.25)
triangle.add( plane );

var directionalLight = new THREE.DirectionalLight( 0xff8472, 1 );
directionalLight.position.x = 10;
scene.add( directionalLight );
var directionalLight = new THREE.DirectionalLight( 0xff9362, 1 );
directionalLight.position.y = 10;
scene.add( directionalLight );
var directionalLight = new THREE.DirectionalLight( 0xdd4a42, 1 );
directionalLight.position.z = 10;
scene.add( directionalLight );

function render(){
  requestAnimationFrame(render);
  if(currentCamera) {
    renderer.render(scene, orthographicCamera);
  } else {
    renderer.render(scene, perspectiveCamera);
    triangle.rotation.x += 0.003;
    triangle.rotation.y += 0.003;
    triangle.rotation.z += 0.003;
  }
}
requestAnimationFrame(render);

var currentCamera = true;
function onResize() {
  ww = window.innerWidth;
  wh = window.innerHeight;
  orthographicCamera.left = ww / - 2;
  orthographicCamera.right = ww / 2;
  orthographicCamera.top = wh / 2;
  orthographicCamera.bottom = wh / - 2;
  orthographicCamera.updateProjectionMatrix();
  
  perspectiveCamera.aspect = ww / wh;
  perspectiveCamera.updateProjectionMatrix();
  renderer.setSize(ww, wh);
}
function onClick() {
  currentCamera = !currentCamera;
  if(currentCamera) {
    triangle.rotation.x = 0;
    triangle.rotation.y = 0;
    triangle.rotation.z = 0;
    document.querySelector('.ortho').classList.add('active');
    document.querySelector('.persp').classList.remove('active');
  } else {
    document.querySelector('.persp').classList.add('active');
    document.querySelector('.ortho').classList.remove('active');
  }
}
window.addEventListener("resize", onResize);
document.body.addEventListener("click", onClick);
            
          
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