three.js实现围绕某物体旋转
话不多说，请看代码：
可以拖动右上角观察变化
<!DOCTYPEhtml>
<htmllang="en"style="width:100%;height:100%;">
<head>
<metacharset="UTF-8">
<title>Document</title>
<scriptsrc="http://cdn.bootcss.com/three.js/r83/three.min.js"></script>
<scriptsrc="http://cooklife.cn/html/node_modules/dat.gui/build/dat.gui.min.js"></script>
</head>
<bodyonload="threeExcute()"style="width:100%;height:100%;">
<divid="box"></div>
</body>
<!--Three.js的核心五步就是：
1.设置three.js渲染器
2.设置摄像机camera
3.设置场景scene
4.设置光源light
5.设置物体object
-->
<script>
//1.设置three.js渲染器
varrenderer;
functioninitThree(){
width=document.getElementById("box").clientWidth;
height=document.getElementById("box").clientHeight;
renderer=newTHREE.WebGLRenderer({
antialias:true
});/*生成渲染器对象（属性：抗锯齿效果为设置有效）*/
renderer.setSize(width,height);
document.getElementById("box").appendChild(renderer.domElement);
/*设置canvas背景色(clearColor)和背景色透明度（clearAlpha）*/
renderer.setClearColor(0xFFFF00,1.0);
}
//2.设置摄像机camera
varcamera;
functioninitCamera(){
camera=newTHREE.PerspectiveCamera(45,width/height,1,10000);
camera.position.x=1000;
camera.position.y=1000;
camera.position.z=1000;
camera.up.x=0;
camera.up.y=0;
camera.up.z=100;
camera.lookAt({x:0,y:0,z:0});//设置视野的中心坐标
}
//3.设置场景
varscene;
functioninitScene(){
scene=newTHREE.Scene();
}
//4.设置光源light
varlight;
functioninitLight(){
light=newTHREE.DirectionalLight(0xFF00FF,1.0,0);//平行光
light.position.set(100,100,200);//设置光源位置
scene.add(light);//将官员添加到场景
}
//5.设置物体
varsphereMesh;
varcubeMesh;
varcubeMesh2;
varcubeMesh3;
varcubeMesh4;
varcubeMesh5;
varcubeMesh6;
functioninitObject(){
cubeMesh=newTHREE.Mesh(newTHREE.BoxGeometry(80,80,80),newTHREE.MeshLambertMaterial({color:0xff0000})/*
设置球体的材质*/);
cubeMesh2=newTHREE.Mesh(newTHREE.BoxGeometry(80,80,80),newTHREE.MeshLambertMaterial({color:0xff0000})/*
设置球体的材质*/);
cubeMesh3=newTHREE.Mesh(newTHREE.BoxGeometry(80,80,80),newTHREE.MeshLambertMaterial({color:0xff0000})/*
设置球体的材质*/);
sphereMesh=newTHREE.Mesh(newTHREE.SphereGeometry(200,200,200),newTHREE.MeshLambertMaterial({color:0xff00FF})/*设置球体的材质*/);//材质设定
sphereMesh.position.set(0,0,0);/*设置物体位置*/
cubeMesh2.position.set(400,0,0);
cubeMesh.position.set(390,150,0);
cubeMesh3.position.set(380,100,0);
/*
*旋转要点。。。
*/
varpivotPoint=newTHREE.Object3D();
pivotPoint.add(cubeMesh);
pivotPoint.add(cubeMesh2);
pivotPoint.add(cubeMesh3);
sphereMesh.add(pivotPoint);
scene.add(sphereMesh);
sphereMesh.name='cube'
}
control=newfunction(){
this.rotationSpeedX=0.001;
this.rotationSpeedY=0.001;
this.rotationSpeedZ=0.001;
};
functionaddController(){
vargui=newdat.GUI();
gui.add(control,'rotationSpeedX',-0.2,0.2);
gui.add(control,'rotationSpeedY',-0.2,0.2);
gui.add(control,'rotationSpeedZ',-0.2,0.2);
}
functionrender(){
renderer.render(scene,camera);
scene.getObjectByName('cube').rotation.x+=control.rotationSpeedX;
scene.getObjectByName('cube').rotation.y+=control.rotationSpeedY;
scene.getObjectByName('cube').rotation.z+=control.rotationSpeedZ;
requestAnimationFrame(render);
}
functionthreeExcute(){
initThree();
initCamera();
initScene();
initLight();
initObject();
renderer.clear();
addController();
render();
}
</script>
<styletype="text/css">
div#box{
border:none;
cursor:move;
width:100%;
height:100%;
background-color:#EEEEEE;
}
</style>
</html>
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