<!DOCTYPE html>
<html>
<head>
<title>Example 05.03 - Basic 2D geometries - Ring</title>
<script src="https://cdn.bootcss.com/three.js/r67/three.js"></script>
<script src="https://cdn.bootcss.com/stats.js/r10/Stats.min.js"></script>
<script type="text/javascript" src="https://cdn.bootcss.com/dat-gui/0.7.3/dat.gui.js"></script>
<style>
body {
margin: 0;
overflow: hidden;
}
</style>
</head>
<body>
<div id="Stats-output">
</div>
<div id="WebGL-output">
</div>
<script type="text/javascript">
// 初始化
function init() {
var stats = initStats();
// 创建一个场景
var scene = new THREE.Scene();
// 创建一个相机
var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
// 创建一个渲染器
var webGLRenderer = new THREE.WebGLRenderer();
webGLRenderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0));
webGLRenderer.setSize(window.innerWidth, window.innerHeight);
webGLRenderer.shadowMapEnabled = true;
var torus = createMesh(new THREE.RingGeometry());
// 把形状添加到场景中去
scene.add(torus);
// 设置相机坐标 和 朝向
camera.position.x = -30;
camera.position.y = 40;
camera.position.z = 50;
camera.lookAt(new THREE.Vector3(10, 0, 0));
// 把渲染后的结果添加到DOM元素中去
document.getElementById("WebGL-output").appendChild(webGLRenderer.domElement);
var step = 0;
var controls = new function () {
this.innerRadius = 0;
this.outerRadius = 50;
this.thetaSegments = 8;
this.phiSegments = 8;
this.thetaStart = 0;
this.thetaLength = Math.PI * 2;
this.redraw = function () {
scene.remove(torus);
torus = createMesh(new THREE.RingGeometry(controls.innerRadius, controls.outerRadius, controls.thetaSegments, controls.phiSegments, controls.thetaStart, controls.thetaLength));
scene.add(torus);
};
};
var gui = new dat.GUI();
gui.add(controls, 'innerRadius', 0, 40).onChange(controls.redraw);
gui.add(controls, 'outerRadius', 0, 100).onChange(controls.redraw);
gui.add(controls, 'thetaSegments', 1, 40).step(1).onChange(controls.redraw);
gui.add(controls, 'phiSegments', 1, 20).step(1).onChange(controls.redraw);
gui.add(controls, 'thetaStart', 0, Math.PI * 2).onChange(controls.redraw);
gui.add(controls, 'thetaLength', 0, Math.PI * 2).onChange(controls.redraw);
render();
function createMesh(geom) {
// 申请两种材质
var meshMaterial = new THREE.MeshNormalMaterial();
meshMaterial.side = THREE.DoubleSide;
var wireFrameMat = new THREE.MeshBasicMaterial();
wireFrameMat.wireframe = true;
// 创建多材质图形
var mesh = THREE.SceneUtils.createMultiMaterialObject(geom, [meshMaterial, wireFrameMat]);
return mesh;
}
function render() {
stats.update();
torus.rotation.y = step += 0.01;
requestAnimationFrame(render);
webGLRenderer.render(scene, camera);
}
function initStats() {
var stats = new Stats();
stats.setMode(0); // 0: fps, 1: ms
stats.domElement.style.position = 'absolute';
stats.domElement.style.left = '0px';
stats.domElement.style.top = '0px';
document.getElementById("Stats-output").appendChild(stats.domElement);
return stats;
}
}
window.onload = init;
</script>
</body>
</html>