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webgl_custom_attributes_ribbons.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - custom attributes [ribbons]</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-color: #000000;
margin: 0px;
overflow: hidden;
font-family:Monospace;
font-size:13px;
text-align:center;
font-weight: bold;
text-align:center;
}
a {
color:#0078ff;
}
#info {
color:#fff;
position: absolute;
top: 0px; width: 100%;
padding: 5px;
z-index:100;
}
</style>
</head>
<body>
<script src="../build/three.min.js"></script>
<script src="js/Detector.js"></script>
<script src="js/libs/stats.min.js"></script>
<div id="info">
<a href="http://threejs.org" target="_blank">three.js</a> - webgl custom attributes example
</div>
<script type="x-shader/x-vertex" id="vertexShader">
uniform float ratio;
attribute vec3 position2;
attribute vec3 customColor;
varying vec3 vColor;
void main() {
vColor = customColor;
vec3 newPosition = mix( position, position2, ratio );
gl_Position = projectionMatrix * modelViewMatrix * vec4( newPosition, 1.0 );
}
</script>
<script type="x-shader/x-fragment" id="fragmentShader">
uniform vec3 color;
varying vec3 vColor;
void main() {
gl_FragColor = vec4( color * vColor, 1.0 );
}
</script>
<script>
if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
var container, stats;
var camera, scene, renderer;
var materials = [];
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 3000 );
camera.position.z = 1200;
scene = new THREE.Scene();
scene.fog = new THREE.FogExp2( 0x000000, 0.0016 );
//
var vertexShader = document.getElementById( 'vertexShader' ).textContent;
var fragmentShader = document.getElementById( 'fragmentShader' ).textContent;
var attributes = { customColor: { type: 'c', boundTo: 'vertices', value: [] },
position2: { type: 'v3', boundTo: 'vertices', value: [] }
};
uniforms = { ratio: { type: "f", value: 1.0 },
color: { type: "c", value: new THREE.Color( 0xffffff ) }
};
var material = new THREE.ShaderMaterial( { uniforms: uniforms, attributes: attributes, vertexShader: vertexShader, fragmentShader: fragmentShader, side: THREE.DoubleSide } );
var position2 = attributes.position2.value;
var colors = attributes.customColor.value;
//
var geometry = new THREE.Geometry();
var i, i2;
var x1, y1, z1;
var x2, y2, z2;
var color;
var n = 200;
for ( i = -n; i < n; i ++ ) {
i2 = i + n;
x1 = 10 * i;
y1 = - 50 + ( i2 % 2 ) * 100 - Math.cos( 4 * Math.PI * i/n ) * 50;
z1 = 0;
x2 = x1;
y2 = y1 + Math.cos( 4 * Math.PI * i/n ) * 100;
z2 = z1;
h = i2 % 2 ? 1 : 0.15;
if ( i2 % 4 <= 2 ) h -= 0.15;
color = new THREE.Color( 0xffffff );
color.setHSV( 0.1 * Math.random(), 0.15, h );
position2[ geometry.vertices.length ] = new THREE.Vector3( x2, y2, z2 );
colors[ geometry.vertices.length ] = color;
geometry.vertices.push( new THREE.Vector3( x1, y1, z1 ) );
}
var ribbon = new THREE.Ribbon( geometry, material );
scene.add( ribbon );
materials.push( ribbon.material );
var ribbon = new THREE.Ribbon( geometry, material.clone() );
ribbon.position.y = 250;
ribbon.position.x = 250;
scene.add( ribbon );
ribbon.material.uniforms.color.value.setHSV( 0, 0.75, 1 );
materials.push( ribbon.material );
var ribbon = new THREE.Ribbon( geometry, material.clone() );
ribbon.position.y = -250;
ribbon.position.x = 250;
scene.add( ribbon );
ribbon.material.uniforms.color.value.setHSV( 0.1, 0.75, 1 );
materials.push( ribbon.material );
//
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setClearColor( scene.fog.color, 1 );
container.appendChild( renderer.domElement );
//
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
container.appendChild( stats.domElement );
//
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
windowHalfX = window.innerWidth / 2;
windowHalfY = window.innerHeight / 2;
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onDocumentMouseMove( event ) {
mouseX = event.clientX - windowHalfX;
mouseY = event.clientY - windowHalfY;
}
function onDocumentTouchStart( event ) {
if ( event.touches.length === 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length === 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
var time = Date.now() * 0.0025;
//camera.position.x += ( mouseX - camera.position.x ) * 0.036;
//camera.position.y += ( - mouseY - camera.position.y ) * 0.036;
camera.lookAt( scene.position );
for ( var i = 0; i < materials.length; i ++ ) {
var uniforms = materials[ i ].uniforms;
uniforms.ratio.value = 0.5 * ( Math.sin( time ) + 1 );
}
renderer.render( scene, camera );
}
</script>
</body>
</html>