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<title>three.js webgl - materials - wireframe</title>
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - materials - wireframe
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<script type="x-shader/x-vertex" id="vertexShader">
attribute vec3 center;
varying vec3 vCenter;
void main() {
vCenter = center;
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}
</script>
<script type="x-shader/x-fragment" id="fragmentShader">
uniform float thickness;
varying vec3 vCenter;
void main() {
vec3 afwidth = fwidth( vCenter.xyz );
vec3 edge3 = smoothstep( ( thickness - 1.0 ) * afwidth, thickness * afwidth, vCenter.xyz );
float edge = 1.0 - min( min( edge3.x, edge3.y ), edge3.z );
gl_FragColor.rgb = gl_FrontFacing ? vec3( 0.9, 0.9, 1.0 ) : vec3( 0.4, 0.4, 0.5 );
gl_FragColor.a = edge;
}
</script>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.8.0/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 { OrbitControls } from 'three/addons/controls/OrbitControls.js';
import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
const API = {
thickness: 1
};
let renderer, scene, camera, mesh2;
init();
function init() {
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 500 );
camera.position.z = 200;
const controls = new OrbitControls( camera, renderer.domElement );
controls.addEventListener( 'change', render ); // use if there is no animation loop
controls.enablePan = false;
controls.enableZoom = false;
new THREE.BufferGeometryLoader().load( 'models/json/WaltHeadLo_buffergeometry.json', function ( geometry ) {
geometry.deleteAttribute( 'normal' );
geometry.deleteAttribute( 'uv' );
setupAttributes( geometry );
// left
const material1 = new THREE.MeshBasicMaterial( {
color: 0xe0e0ff,
wireframe: true
} );
const mesh1 = new THREE.Mesh( geometry, material1 );
mesh1.position.set( - 40, 0, 0 );
scene.add( mesh1 );
// right
const material2 = new THREE.ShaderMaterial( {
uniforms: { 'thickness': { value: API.thickness } },
vertexShader: document.getElementById( 'vertexShader' ).textContent,
fragmentShader: document.getElementById( 'fragmentShader' ).textContent,
side: THREE.DoubleSide,
alphaToCoverage: true // only works when WebGLRenderer's "antialias" is set to "true"
} );
material2.extensions.derivatives = true;
mesh2 = new THREE.Mesh( geometry, material2 );
mesh2.position.set( 40, 0, 0 );
scene.add( mesh2 );
//
render();
} );
//
const gui = new GUI();
gui.add( API, 'thickness', 0, 4 ).onChange( function () {
mesh2.material.uniforms.thickness.value = API.thickness;
render();
} );
gui.open();
//
window.addEventListener( 'resize', onWindowResize );
}
function setupAttributes( geometry ) {
const vectors = [
new THREE.Vector3( 1, 0, 0 ),
new THREE.Vector3( 0, 1, 0 ),
new THREE.Vector3( 0, 0, 1 )
];
const position = geometry.attributes.position;
const centers = new Float32Array( position.count * 3 );
for ( let i = 0, l = position.count; i < l; i ++ ) {
vectors[ i % 3 ].toArray( centers, i * 3 );
}
geometry.setAttribute( 'center', new THREE.BufferAttribute( centers, 3 ) );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function render() {
renderer.render( scene, camera );
}
</script>
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