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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js WebGL 2 - buffergeometry - attributes - none</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> WebGL 2 - buffergeometry - attributes - none</div>
- <script id="vertexShader" type="x-shader/x-vertex">
- uniform mat4 modelViewMatrix;
- uniform mat4 projectionMatrix;
- uniform float seed;
- const uint ieeeMantissa = 0x007FFFFFu;
- const uint ieeeOne = 0x3F800000u;
- uint hash(uint x) {
- x += ( x << 10u );
- x ^= ( x >> 6u );
- x += ( x << 3u );
- x ^= ( x >> 11u );
- x += ( x << 15u );
- return x;
- }
- uint hash(uvec2 v) { return hash( v.x ^ hash(v.y) ); }
- float hashNoise(vec2 xy) {
- uint m = hash(floatBitsToUint(xy));
- m &= ieeeMantissa;
- m |= ieeeOne;
- return uintBitsToFloat( m ) - 1.0;
- }
- float pseudoRandom(float lower, float delta, in vec2 xy) {
- return lower + delta*hashNoise(xy);
- }
- vec3 pseudoRandomVec3(float lower, float upper, int index) {
- float delta = upper - lower;
- float x = pseudoRandom(lower, delta, vec2(index, 0));
- float y = pseudoRandom(lower, delta, vec2(index, 1));
- float z = pseudoRandom(lower, delta, vec2(index, 2));
- return vec3(x, y, z);
- }
- out vec3 vColor;
- void main() {
- const float scale = 1.0/64.0;
- vec3 position = pseudoRandomVec3(-1.0, +1.0, gl_VertexID/3) + scale * pseudoRandomVec3(-1.0, +1.0, gl_VertexID);
- vec3 color = pseudoRandomVec3(0.25, 1.0, gl_VertexID/3);
- gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0 );
- vColor = color;
- }
- </script>
- <script id="fragmentShader" type="x-shader/x-fragment">
- precision mediump float;
- in vec3 vColor;
- out vec4 fColor;
- void main() {
- fColor = vec4(vColor, 1);
- }
- </script>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- let camera, scene, renderer, mesh;
- init();
- function init() {
- camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
- camera.position.z = 4;
- scene = new THREE.Scene();
- scene.background = new THREE.Color( 0x050505 );
- scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );
- // geometry
- const triangleCount = 10000;
- const vertexCountPerTriangle = 3;
- const vertexCount = triangleCount * vertexCountPerTriangle;
- const geometry = new THREE.BufferGeometry();
- geometry.setDrawRange( 0, vertexCount );
- // material
- const material = new THREE.RawShaderMaterial( {
- uniforms: {
- seed: { value: 42 },
- },
- vertexShader: document.getElementById( 'vertexShader' ).textContent,
- fragmentShader: document.getElementById( 'fragmentShader' ).textContent,
- side: THREE.DoubleSide,
- glslVersion: THREE.GLSL3
- } );
- // mesh
- mesh = new THREE.Mesh( geometry, material );
- mesh.frustumCulled = false;
- scene.add( mesh );
- // renderer
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- document.body.appendChild( renderer.domElement );
- }
- function animate( time ) {
- mesh.rotation.x = time / 1000.0 * 0.25;
- mesh.rotation.y = time / 1000.0 * 0.50;
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
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