forked from mrdoob/three.js
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathwebgl_materials_grass.html
151 lines (96 loc) · 3.25 KB
/
webgl_materials_grass.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
<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - materials - grass</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
background:#030;
color:#fff;
padding:0;
margin:0;
overflow:hidden;
font-family:georgia;
text-align:center;
}
</style>
</head>
<body>
<script src="../build/three.min.js"></script>
<script src="js/Detector.js"></script>
<script>
if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
var camera, scene, renderer,
mesh, levels = [];
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 1000 );
camera.position.set( 0, 75, 100 );
scene = new THREE.Scene();
var geometry = new THREE.PlaneGeometry( 100, 100 );
var bitmap = generateTextureBase();
for ( var i = 0; i < 15; i ++ ) {
mesh = levels[ i ] = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { map: new THREE.Texture( generateTextureLevel( bitmap ) ), transparent: true, depthWrite: false, depthTest: false } ) );
mesh.material.map.needsUpdate = true;
mesh.position.y = i * 0.25;
mesh.rotation.x = - Math.PI / 2;
scene.add( mesh );
}
renderer = new THREE.WebGLRenderer();
renderer.sortObjects = false;
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function generateTextureBase() {
var canvas = document.createElement( 'canvas' );
canvas.width = 512;
canvas.height = 512;
var context = canvas.getContext( '2d' );
for ( var i = 0; i < 20000; i ++ ) {
context.fillStyle = 'rgba(0,' + Math.floor( Math.random() * 64 + 32 ) + ',16,1)';
context.beginPath();
context.arc( Math.random() * canvas.width, Math.random() * canvas.height, Math.random() * 1 + 0.5, 0, Math.PI * 2, true );
context.closePath();
context.fill();
}
context.globalAlpha = 0.075;
context.globalCompositeOperation = 'lighter';
return canvas;
}
function generateTextureLevel( texture ) {
texture.getContext( '2d' ).drawImage( texture, 0, 0 );
var canvas = document.createElement( 'canvas' );
canvas.width = texture.width;
canvas.height = texture.height;
canvas.getContext( '2d' ).drawImage( texture, 0, 0 );
return canvas;
}
//
function animate() {
requestAnimationFrame( animate );
render();
}
function render() {
var time = Date.now() / 6000;
camera.position.x = 80 * Math.cos( time );
camera.position.z = 80 * Math.sin( time );
camera.lookAt( scene.position );
for ( var i = 0, l = levels.length; i < l; i ++ ) {
mesh = levels[ i ];
mesh.position.x = Math.sin( time * 4 ) * i * i * 0.005;
mesh.position.z = Math.cos( time * 6 ) * i * i * 0.005;
}
renderer.render( scene, camera );
}
</script>
</body>
</html>