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<title>three.js webgl - helpers</title>
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - helpers
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<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
import { VertexNormalsHelper } from 'three/addons/helpers/VertexNormalsHelper.js';
import { VertexTangentsHelper } from 'three/addons/helpers/VertexTangentsHelper.js';
let scene, renderer;
let camera, light;
let vnh;
let vth;
init();
animate();
function init() {
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
//
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 1000 );
camera.position.z = 400;
scene = new THREE.Scene();
light = new THREE.PointLight();
light.position.set( 200, 100, 150 );
scene.add( light );
scene.add( new THREE.PointLightHelper( light, 15 ) );
const gridHelper = new THREE.GridHelper( 400, 40, 0x0000ff, 0x808080 );
gridHelper.position.y = - 150;
gridHelper.position.x = - 150;
scene.add( gridHelper );
const polarGridHelper = new THREE.PolarGridHelper( 200, 16, 8, 64, 0x0000ff, 0x808080 );
polarGridHelper.position.y = - 150;
polarGridHelper.position.x = 200;
scene.add( polarGridHelper );
const loader = new GLTFLoader();
loader.load( 'models/gltf/LeePerrySmith/LeePerrySmith.glb', function ( gltf ) {
const mesh = gltf.scene.children[ 0 ];
mesh.geometry.computeTangents(); // generates bad data due to degenerate UVs
const group = new THREE.Group();
group.scale.multiplyScalar( 50 );
scene.add( group );
// To make sure that the matrixWorld is up to date for the boxhelpers
group.updateMatrixWorld( true );
group.add( mesh );
vnh = new VertexNormalsHelper( mesh, 5 );
scene.add( vnh );
vth = new VertexTangentsHelper( mesh, 5 );
scene.add( vth );
scene.add( new THREE.BoxHelper( mesh ) );
const wireframe = new THREE.WireframeGeometry( mesh.geometry );
let line = new THREE.LineSegments( wireframe );
line.material.depthTest = false;
line.material.opacity = 0.25;
line.material.transparent = true;
line.position.x = 4;
group.add( line );
scene.add( new THREE.BoxHelper( line ) );
const edges = new THREE.EdgesGeometry( mesh.geometry );
line = new THREE.LineSegments( edges );
line.material.depthTest = false;
line.material.opacity = 0.25;
line.material.transparent = true;
line.position.x = - 4;
group.add( line );
scene.add( new THREE.BoxHelper( line ) );
scene.add( new THREE.BoxHelper( group ) );
scene.add( new THREE.BoxHelper( scene ) );
} );
//
window.addEventListener( 'resize', onWindowResize );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
requestAnimationFrame( animate );
const time = - performance.now() * 0.0003;
camera.position.x = 400 * Math.cos( time );
camera.position.z = 400 * Math.sin( time );
camera.lookAt( scene.position );
light.position.x = Math.sin( time * 1.7 ) * 300;
light.position.y = Math.cos( time * 1.5 ) * 400;
light.position.z = Math.cos( time * 1.3 ) * 300;
if ( vnh ) vnh.update();
if ( vth ) vth.update();
renderer.render( scene, camera );
}
</script>
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