<!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">

<meta property="og:title" content="three.js WebGL 2 - buffergeometry - attributes - none">

<meta property="og:type" content="website">

<meta property="og:url" content="https://threejs.org/examples/webgl_buffergeometry_attributes_none.html">

<meta property="og:image" content="https://threejs.org/examples/screenshots/webgl_buffergeometry_attributes_none.jpg">

<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>