<!DOCTYPE html> <html lang="en"> <head> <title>three.js canvas - particles - sprites</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; } a { color:#0078ff; } </style> </head> <body> <script src="../build/three.min.js"></script> <script src="js/renderers/Projector.js"></script> <script src="js/renderers/CanvasRenderer.js"></script> <script src="js/libs/stats.min.js"></script> <script src="js/libs/tween.min.js"></script> <script> var container, stats; var camera, scene, renderer, particle; 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( 75, window.innerWidth / window.innerHeight, 1, 5000 ); camera.position.z = 1000; scene = new THREE.Scene(); var material = new THREE.SpriteMaterial( { map: new THREE.Texture( generateSprite() ), blending: THREE.AdditiveBlending } ); for ( var i = 0; i < 1000; i++ ) { particle = new THREE.Sprite( material ); initParticle( particle, i * 10 ); scene.add( particle ); } renderer = new THREE.CanvasRenderer(); renderer.setClearColor( 0x000040 ); renderer.setPixelRatio( window.devicePixelRatio ); renderer.setSize( window.innerWidth, window.innerHeight ); 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 generateSprite() { var canvas = document.createElement( 'canvas' ); canvas.width = 16; canvas.height = 16; var context = canvas.getContext( '2d' ); var gradient = context.createRadialGradient( canvas.width / 2, canvas.height / 2, 0, canvas.width / 2, canvas.height / 2, canvas.width / 2 ); gradient.addColorStop( 0, 'rgba(255,255,255,1)' ); gradient.addColorStop( 0.2, 'rgba(0,255,255,1)' ); gradient.addColorStop( 0.4, 'rgba(0,0,64,1)' ); gradient.addColorStop( 1, 'rgba(0,0,0,1)' ); context.fillStyle = gradient; context.fillRect( 0, 0, canvas.width, canvas.height ); return canvas; } function initParticle( particle, delay ) { var particle = this instanceof THREE.Sprite ? this : particle; var delay = delay !== undefined ? delay : 0; particle.position.set( 0, 0, 0 ) particle.scale.x = particle.scale.y = Math.random() * 32 + 16; new TWEEN.Tween( particle ) .delay( delay ) .to( {}, 10000 ) .onComplete( initParticle ) .start(); new TWEEN.Tween( particle.position ) .delay( delay ) .to( { x: Math.random() * 4000 - 2000, y: Math.random() * 1000 - 500, z: Math.random() * 4000 - 2000 }, 10000 ) .start(); new TWEEN.Tween( particle.scale ) .delay( delay ) .to( { x: 0, y: 0 }, 10000 ) .start(); } // 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() { TWEEN.update(); camera.position.x += ( mouseX - camera.position.x ) * 0.05; camera.position.y += ( - mouseY - camera.position.y ) * 0.05; camera.lookAt( scene.position ); renderer.render( scene, camera ); } </script> </body> </html>