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132 lines
3.1 KiB
132 lines
3.1 KiB
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - trails</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<style>
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body {
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background:#000;
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padding:0;
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margin:0;
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font-weight: bold;
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overflow:hidden;
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}
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</style>
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</head>
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<body>
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<script src="../build/three.js"></script>
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<script src="js/libs/stats.min.js"></script>
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<script>
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var container, stats;
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var camera, scene, renderer;
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var mouseX = 0, mouseY = 0;
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var windowHalfX = window.innerWidth / 2;
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var windowHalfY = window.innerHeight / 2;
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init();
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animate();
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function init() {
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container = document.createElement( 'div' );
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document.body.appendChild( container );
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camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 10000 );
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camera.position.set( 0, 0, 1000 );
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scene = new THREE.Scene();
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var colorArray = [ new THREE.Color( 0xff0080 ), new THREE.Color( 0xffffff ), new THREE.Color( 0x8000ff ) ];
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var positions = [];
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var colors = [];
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for ( var i = 0; i < 100; i ++ ) {
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positions.push( 4000 * ( Math.random() - 0.5 ), 4000 * ( Math.random() - 0.5 ), 4000 * ( Math.random() - 0.5 ) );
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var clr = colorArray[ Math.floor( Math.random() * colorArray.length ) ];
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colors.push( clr.r, clr.g, clr.b );
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}
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var geometry = new THREE.BufferGeometry();
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geometry.addAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
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geometry.addAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
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var material = new THREE.PointsMaterial( { size: 4, vertexColors: THREE.VertexColors, depthTest: false, sizeAttenuation: false } );
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var mesh = new THREE.Points( geometry, material );
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scene.add( mesh );
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renderer = new THREE.WebGLRenderer( { preserveDrawingBuffer: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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renderer.autoClearColor = false;
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container.appendChild( renderer.domElement );
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stats = new Stats();
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container.appendChild( stats.dom );
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//
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document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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window.addEventListener( 'resize', onWindowResize, false );
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}
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function onWindowResize() {
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windowHalfX = window.innerWidth / 2;
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windowHalfY = window.innerHeight / 2;
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function onDocumentMouseMove( event ) {
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mouseX = ( event.clientX - windowHalfX ) * 10;
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mouseY = ( event.clientY - windowHalfY ) * 10;
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}
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//
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function animate() {
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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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camera.position.x += ( mouseX - camera.position.x ) * .05;
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camera.position.y += ( - mouseY - camera.position.y ) * .05;
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camera.lookAt( scene.position );
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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