模型导入到上一节也就先告一段落了，接下来，我将学习动画方面的知识。在这之前，我先复习了一下基础变化的相关知识。
基础动画就是缩放、位置和旋转，也就是配置模型的scale、position和rotation。我直接写了一个案例，来实现三种动画。
- 首先，我们创建了三个添加动画的模型：立方体、球和圆柱。
sphere = new three.mesh(spheregeometry, spherematerial); cube = new three.mesh(cubegeometry, cubematerial); cylinder = new three.mesh(cylindergeometry, cylindermaterial);
然后在render里面分别修改它们的scale、position和rotation。
//处理位置变化的球的移动 positionstep += gui.positionstep; sphere.position.x = 10*math.cos(positionstep) - 10; sphere.position.y = 5 + math.abs(math.sin(positionstep))*10; //处理立方体的旋转 cube.rotation.x += gui.rotationstep; cube.rotation.y += gui.rotationstep; cube.rotation.z += gui.rotationstep; //处理圆柱体的缩放 scalestep += gui.scalestep; cylinder.scale.x = math.abs(math.sin(scalestep)); cylinder.scale.y = math.abs(math.cos(scalestep)); cylinder.scale.z = math.abs(math.sin(scalestep));
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>title</title>
<style type="text/css">
html, body {
margin: 0;
height: 100%;
}
canvas {
display: block;
}
</style>
</head>
<body onload="draw();">
</body>
<script src="/lib/three.js"></script>
<script src="/lib/js/controls/orbitcontrols.js"></script>
<script src="/lib/js/libs/stats.min.js"></script>
<script src="/lib/js/libs/dat.gui.min.js"></script>
<script>
var renderer;
function initrender() {
renderer = new three.webglrenderer({antialias:true});
renderer.setsize(window.innerwidth, window.innerheight);
//告诉渲染器需要阴影效果
renderer.shadowmap.enabled = true;
renderer.shadowmap.type = three.pcfsoftshadowmap; // 默认的是，没有设置的这个清晰 three.pcfshadowmap
document.body.appendchild(renderer.domelement);
}
var camera;
function initcamera() {
camera = new three.perspectivecamera(45, window.innerwidth/window.innerheight, 0.1, 1000);
camera.position.set(0, 40, 50);
camera.lookat(new three.vector3(0,0,0));
}
var scene;
function initscene() {
scene = new three.scene();
}
//初始化dat.gui简化试验流程
var gui;
function initgui() {
//声明一个保存需求修改的相关数据的对象
gui = {
scalestep:0.01,
rotationstep:0.03,
positionstep:0.05
};
var datgui = new dat.gui();
//将设置属性添加到gui当中，gui.add(对象，属性，最小值，最大值）
datgui.add(gui, "scalestep", 0, 1);
datgui.add(gui, "rotationstep", 0, 1);
datgui.add(gui, "positionstep", 0, 1);
}
var light;
function initlight() {
scene.add(new three.ambientlight(0x444444));
light = new three.pointlight(0xffffff);
light.position.set(15,50,10);
//告诉平行光需要开启阴影投射
light.castshadow = true;
scene.add(light);
}
var sphere,cube,cylinder;
function initmodel() {
//球
var spheregeometry = new three.spheregeometry(5,200,200);
var spherematerial = new three.meshlambertmaterial({color:0xaaaaaa});
sphere = new three.mesh(spheregeometry, spherematerial);
sphere.position.x = -10;
sphere.position.y = 5;
sphere.position.z = 10;
//告诉球需要投射阴影
sphere.castshadow = true;
scene.add(sphere);
//辅助工具
var helper = new three.axeshelper(50);
scene.add(helper);
//立方体
var cubegeometry = new three.cubegeometry(10,10,8);
var cubematerial = new three.meshlambertmaterial({color:0x00ffff});
cube = new three.mesh(cubegeometry, cubematerial);
cube.position.x = 15;
cube.position.y = 5;
cube.position.z = -5;
//告诉立方体需要投射阴影
cube.castshadow = true;
scene.add(cube);
//创建圆柱体
var cylindergeometry = new three.cylindergeometry(5, 5, 10, 40, 20);
var cylindermaterial = new three.meshphongmaterial({color:0xff5f4d});
cylinder = new three.mesh(cylindergeometry, cylindermaterial);
cylinder.position.set(-15, 5, -10);
cylinder.castshadow = true;
scene.add(cylinder);
//底部平面
var planegeometry = new three.planegeometry(100,100);
var planematerial = new three.meshstandardmaterial({color:0xaaaaaa});
var plane = new three.mesh(planegeometry, planematerial);
plane.rotation.x = - 0.5 * math.pi;
plane.position.y = 0;
//告诉底部平面需要接收阴影
plane.receiveshadow = true;
scene.add(plane);
}
//初始化性能插件
var stats;
function initstats() {
stats = new stats();
document.body.appendchild(stats.dom);
}
//用户交互插件 鼠标左键按住旋转，右键按住平移，滚轮缩放
var controls;
function initcontrols() {
controls = new three.orbitcontrols( camera, renderer.domelement );
// 如果使用animate方法时，将此函数删除
//controls.addeventlistener( 'change', render );
// 使动画循环使用时阻尼或自转 意思是否有惯性
controls.enabledamping = true;
//动态阻尼系数 就是鼠标拖拽旋转灵敏度
//controls.dampingfactor = 0.25;
//是否可以缩放
controls.enablezoom = true;
//是否自动旋转
controls.autorotate = false;
//设置相机距离原点的最远距离
controls.mindistance = 100;
//设置相机距离原点的最远距离
controls.maxdistance = 200;
//是否开启右键拖拽
controls.enablepan = true;
}
var positionstep = 0,scalestep = 0; //模型旋转的速度
function render() {
//处理简单动画
//处理位置变化的球的移动
positionstep += gui.positionstep;
sphere.position.x = 10*math.cos(positionstep) - 10;
sphere.position.y = 5 + math.abs(math.sin(positionstep))*10;
//处理立方体的旋转
cube.rotation.x += gui.rotationstep;
cube.rotation.y += gui.rotationstep;
cube.rotation.z += gui.rotationstep;
//处理圆柱体的缩放
scalestep += gui.scalestep;
cylinder.scale.x = math.abs(math.sin(scalestep));
cylinder.scale.y = math.abs(math.cos(scalestep));
cylinder.scale.z = math.abs(math.sin(scalestep));
}
//窗口变动触发的函数
function onwindowresize() {
camera.aspect = window.innerwidth / window.innerheight;
camera.updateprojectionmatrix();
render();
renderer.setsize( window.innerwidth, window.innerheight );
}
function animate() {
//更新控制器
render();
//更新性能插件
stats.update();
controls.update();
renderer.render( scene, camera );
requestanimationframe(animate);
}
function draw() {
initgui();
initrender();
initscene();
initcamera();
initlight();
initmodel();
initcontrols();
initstats();
animate();
window.onresize = onwindowresize;
}
</script>
</html>
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