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webgl_materials_modified.html
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webgl_materials_modified.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - materials - modified</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<link type="text/css" rel="stylesheet" href="main.css">
</head>
<body>
<div id="info">
<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> wegbl - modified material.
<a href="https://casual-effects.com/data/" target="_blank" rel="noopener">Lee Perry-Smith</a> head.
</div>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import Stats from 'three/addons/libs/stats.module.js';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
let camera, scene, renderer, stats;
init();
function init() {
camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 0.1, 100 );
camera.position.z = 20;
scene = new THREE.Scene();
const loader = new GLTFLoader();
loader.load( 'models/gltf/LeePerrySmith/LeePerrySmith.glb', function ( gltf ) {
const geometry = gltf.scene.children[ 0 ].geometry;
let mesh = new THREE.Mesh( geometry, buildTwistMaterial( 2.0 ) );
mesh.position.x = - 3.5;
mesh.position.y = - 0.5;
scene.add( mesh );
mesh = new THREE.Mesh( geometry, buildTwistMaterial( - 2.0 ) );
mesh.position.x = 3.5;
mesh.position.y = - 0.5;
scene.add( mesh );
} );
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setAnimationLoop( animate );
document.body.appendChild( renderer.domElement );
const controls = new OrbitControls( camera, renderer.domElement );
controls.minDistance = 10;
controls.maxDistance = 50;
//
stats = new Stats();
document.body.appendChild( stats.dom );
// EVENTS
window.addEventListener( 'resize', onWindowResize );
}
function buildTwistMaterial( amount ) {
const material = new THREE.MeshNormalMaterial();
material.onBeforeCompile = function ( shader ) {
shader.uniforms.time = { value: 0 };
shader.vertexShader = 'uniform float time;\n' + shader.vertexShader;
shader.vertexShader = shader.vertexShader.replace(
'#include <begin_vertex>',
[
`float theta = sin( time + position.y ) / ${ amount.toFixed( 1 ) };`,
'float c = cos( theta );',
'float s = sin( theta );',
'mat3 m = mat3( c, 0, s, 0, 1, 0, -s, 0, c );',
'vec3 transformed = vec3( position ) * m;',
'vNormal = vNormal * m;'
].join( '\n' )
);
material.userData.shader = shader;
};
// Make sure WebGLRenderer doesnt reuse a single program
material.customProgramCacheKey = function () {
return amount.toFixed( 1 );
};
return material;
}
//
function onWindowResize() {
const width = window.innerWidth;
const height = window.innerHeight;
camera.aspect = width / height;
camera.updateProjectionMatrix();
renderer.setSize( width, height );
}
//
function animate() {
render();
stats.update();
}
function render() {
scene.traverse( function ( child ) {
if ( child.isMesh ) {
const shader = child.material.userData.shader;
if ( shader ) {
shader.uniforms.time.value = performance.now() / 1000;
}
}
} );
renderer.render( scene, camera );
}
</script>
</body>
</html>