<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Particle</title>
<script src="../../three-part/threejs/three.js"></script>
<script src="../../three-part/utils/stats.min.js"></script>
<script src="../../three-part/utils/dat.gui.min.js"></script>
<script src="../controls/TrackballControls.js"></script>
<script src="../util/util.js"></script>
<style>
body {
margin: 0;
overflow: hidden;
}
</style>
</head>
<body>
<div id="container"></div>
<script type="text/javascript">
init();
function init() {
// show FPS
let stats = initStats();
// resize
window.addEventListener('resize', onResize, false);
let scene = new THREE.Scene();
let camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.x = -30;
camera.position.y = 40;
camera.position.z = 50;
camera.lookAt(scene.position);
let renderer = new THREE.WebGLRenderer();
renderer.setClearColor(new THREE.Color(0x000000));
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMap.enabled = true;
document.getElementById("container").appendChild(renderer.domElement);
// init trackball control
let trackballControls = initTrackballControls(camera, renderer);
let clock = new THREE.Clock();
let knot;
// attributes which can be modified in GUI
const controls = {
"radius" : 13,
"tube" : 1.7,
"radialSegments" : 156,
"tubularSegments" : 12,
"p" : 5,
"q" : 4,
"asParticles" : false,
"rotate" : false,
"redraw" : function(){
if(knot){
scene.remove(knot);
}
let geometry = new THREE.TorusKnotGeometry(controls.radius, controls.tube, Math.round(controls.radialSegments), Math.round(controls.tubularSegments), Math.round(controls.p), Math.round(controls.q));
knot = createPoints(geometry);
if (controls.asParticles) {
knot = createPoints(geometry);
} else {
knot = new THREE.Mesh(geometry, new THREE.MeshNormalMaterial());
}
scene.add(knot);
}
};
// init GUI
initGUI();
controls.redraw();
renderScene();
function initGUI(){
let gui = new dat.GUI();
gui.add(controls, 'radius', 0, 40).onChange(controls.redraw);
gui.add(controls, 'tube', 0, 40).onChange(controls.redraw);
gui.add(controls, 'radialSegments', 0, 400).step(1).onChange(controls.redraw);
gui.add(controls, 'tubularSegments', 1, 20).step(1).onChange(controls.redraw);
gui.add(controls, 'p', 1, 10).step(1).onChange(controls.redraw);
gui.add(controls, 'q', 1, 15).step(1).onChange(controls.redraw);
gui.add(controls, 'asParticles').onChange(controls.redraw);
gui.add(controls, 'rotate').onChange(controls.redraw);
}
function generateSprite() {
let canvas = document.createElement('canvas');
canvas.width = 16;
canvas.height = 16;
let context = canvas.getContext('2d');
let 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);
let texture = new THREE.Texture(canvas);
texture.needsUpdate = true;
return texture;
}
function createPoints(geom) {
let material = new THREE.PointsMaterial({
color: 0xffffff,
size: 3,
transparent: true,
blending: THREE.AdditiveBlending,
map: generateSprite(),
depthWrite: false
});
return new THREE.Points(geom, material);
}
function onResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function renderScene(){
trackballControls.update(clock.getDelta());
stats.update();
if (controls.rotate) {
knot.rotation.y += 0.01;
}
requestAnimationFrame(renderScene);
renderer.render(scene, camera);
}
}
</script>
</body>
</html>
运行结果：
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