This repository has been archived by the owner on Nov 18, 2024. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 37
/
webgl_buffergeometry_glbufferattribute.html
189 lines (119 loc) · 4.77 KB
/
webgl_buffergeometry_glbufferattribute.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
<!DOCTYPE html>
<html lang="en">
<head>
<title>Verge3D webgl - buffergeometry - custom VBOs</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="container"></div>
<div id="info"><a href="https://www.soft8soft.com/verge3d" target="_blank" rel="noopener">Verge3D</a> webgl - buffergeometry - custom VBOs</div>
<!-- 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": {
"v3d": "../build/v3d.module.js",
"v3d/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as v3d from 'v3d';
import Stats from 'v3d/addons/libs/stats.module.js';
let container, stats;
let camera, scene, renderer;
let points;
const particles = 300000;
let drawCount = 10000;
init();
animate();
function init() {
container = document.getElementById('container');
//
renderer = new v3d.WebGLRenderer({ antialias: false });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
container.appendChild(renderer.domElement);
//
camera = new v3d.PerspectiveCamera(27, window.innerWidth / window.innerHeight, 5, 3500);
camera.position.z = 2750;
scene = new v3d.Scene();
scene.background = new v3d.Color(0x050505);
scene.fog = new v3d.Fog(0x050505, 2000, 3500);
//
const geometry = new v3d.BufferGeometry();
const positions = [];
const positions2 = [];
const colors = [];
const color = new v3d.Color();
const n = 1000, n2 = n / 2; // particles spread in the cube
for (let i = 0; i < particles; i++) {
// positions
const x = Math.random() * n - n2;
const y = Math.random() * n - n2;
const z = Math.random() * n - n2;
positions.push(x, y, z);
positions2.push(z * 0.3, x * 0.3, y * 0.3);
// colors
const vx = (x / n) + 0.5;
const vy = (y / n) + 0.5;
const vz = (z / n) + 0.5;
color.setRGB(vx, vy, vz);
colors.push(color.r, color.g, color.b);
}
const gl = renderer.getContext();
const pos = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, pos);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW);
const pos2 = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, pos2);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions2), gl.STATIC_DRAW);
const rgb = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, rgb);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(colors), gl.STATIC_DRAW);
const posAttr1 = new v3d.GLBufferAttribute(pos, gl.FLOAT, 3, 4, particles);
const posAttr2 = new v3d.GLBufferAttribute(pos2, gl.FLOAT, 3, 4, particles);
geometry.setAttribute('position', posAttr1);
setInterval(function() {
const attr = geometry.getAttribute('position');
geometry.setAttribute('position', (attr === posAttr1) ? posAttr2 : posAttr1);
}, 2000);
geometry.setAttribute('color', new v3d.GLBufferAttribute(rgb, gl.FLOAT, 3, 4, particles));
//
const material = new v3d.PointsMaterial({ size: 15, vertexColors: true });
points = new v3d.Points(geometry, material);
// Choose one:
// geometry.boundingSphere = (new v3d.Sphere()).set(new v3d.Vector3(), Infinity);
points.frustumCulled = false;
scene.add(points);
//
stats = new Stats();
container.appendChild(stats.dom);
//
window.addEventListener('resize', onWindowResize);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
//
function animate() {
requestAnimationFrame(animate);
render();
stats.update();
}
function render() {
drawCount = (Math.max(5000, drawCount) + Math.floor(500 * Math.random())) % particles;
points.geometry.setDrawRange(0, drawCount);
const time = Date.now() * 0.001;
points.rotation.x = time * 0.1;
points.rotation.y = time * 0.2;
renderer.render(scene, camera);
}
</script>
</body>
</html>