javascript ThreeJS 旋转动画
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ThreeJS Rotation Animation
提问by Catherine Hwang
I have a cube in ThreeJS and I would like to rotate it 90 degrees clockwise every time I press a button. I think I have the basic gist of it: create a Three.Animation instance, bind it to the cube, and then have the animation begin every time I press the correct button. However, I'm having a difficult time understanding ThreeJS's API, because it doesn't seem to contain any examples for its methods.
我在 ThreeJS 中有一个立方体，每次按下按钮时我都想将它顺时针旋转 90 度。我想我有它的基本要点：创建一个 Three.Animation 实例，将它绑定到立方体，然后每次按下正确的按钮时动画开始。但是，我很难理解 ThreeJS 的 API，因为它似乎没有包含任何方法示例。
This is THREE.js's Animation constructor: ( root, data, interpolationType, JITCompile ) I don't understand what goes into the fields. I'm guessing root would be where I put my cube, but what about the rest?
这是 THREE.js 的 Animation 构造函数：（根、数据、插值类型、JITCompile）我不明白字段中的内容。我猜根将是我放置立方体的地方，但其余的呢？
Also can I just call animation.play()to cause the animation whenever I want? And how does the animationHandler work?
我也可以随时打电话animation.play()来引发动画吗？animationHandler 是如何工作的？
回答by George Profenza
I think for for rotating an object 90 degrees clockwise, using the TWEEN class will do. I think the Animation class is handy for heavier stuff (like bones/skin morphs/etc.)
我认为要将对象顺时针旋转 90 度，使用 TWEEN 类就可以了。我认为 Animation 类对于较重的东西（如骨骼/皮肤变形等）很方便。
To use the tween class there are 3 basic steps:
要使用 tween 类，有 3 个基本步骤：
- include the class in your file (
<script src="js/Tween.js"></script>) - add your tween for the event you need (
new TWEEN.Tween( cube.rotation ).to( { y:Math.random()}, 1000 ).easing( TWEEN.Easing.Quadratic.EaseOut).start();) - update the tween in your render loop (
TWEEN.update();)
- 在您的文件中包含该类 (
<script src="js/Tween.js"></script>) - 为您需要的事件添加补间 (
new TWEEN.Tween( cube.rotation ).to( { y:Math.random()}, 1000 ).easing( TWEEN.Easing.Quadratic.EaseOut).start();) - 更新渲染循环中的补间 (
TWEEN.update();)
You can have a have a look at the cubes tween examplefor a start.
您可以先看看多维数据集补间示例。
I've modified the default cube example to have the tween in:
我修改了默认的多维数据集示例以在其中添加补间：
<!doctype html>
<html lang="en">
<head>
<title>three.js canvas - geometry - cube</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 {
font-family: Monospace;
background-color: #f0f0f0;
margin: 0px;
overflow: hidden;
}
</style>
</head>
<body>
<script src="../build/Three.js"></script>
<script src="js/Tween.js"></script>
<script src="js/RequestAnimationFrame.js"></script>
<script src="js/Stats.js"></script>
<script>
var container, stats;
var camera, scene, renderer;
var cube, plane;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var rad90 = Math.PI * .5;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
var info = document.createElement( 'div' );
info.style.position = 'absolute';
info.style.top = '10px';
info.style.width = '100%';
info.style.textAlign = 'center';
info.innerHTML = 'click to tween';
container.appendChild( info );
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 1000 );
camera.position.y = 150;
camera.position.z = 500;
scene = new THREE.Scene();
// Cube
var materials = [];
for ( var i = 0; i < 6; i ++ ) {
materials.push( [ new THREE.MeshBasicMaterial( { color: Math.random() * 0xffffff } ) ] );
}
cube = new THREE.Mesh( new THREE.CubeGeometry( 200, 200, 200, 1, 1, 1, materials ), new THREE.MeshFaceMaterial() );
cube.position.y = 150;
cube.overdraw = true;
scene.add( cube );
// Plane
plane = new THREE.Mesh( new THREE.PlaneGeometry( 200, 200 ), new THREE.MeshBasicMaterial( { color: 0xe0e0e0 } ) );
plane.rotation.x = - 90 * ( Math.PI / 180 );
plane.overdraw = true;
scene.add( plane );
renderer = new THREE.CanvasRenderer();
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( 'mousedown', onDocumentMouseDown, false );
}
//
function onDocumentMouseDown( event ) {
event.preventDefault();
new TWEEN.Tween( cube.rotation ).to( { y: cube.rotation.y + rad90}, 1000 ).easing( TWEEN.Easing.Quadratic.EaseOut).start();
new TWEEN.Tween( plane.rotation ).to( { z: plane.rotation.z + rad90}, 1000 ).easing( TWEEN.Easing.Quadratic.EaseOut).start();
console.log("click");
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
TWEEN.update();
renderer.render( scene, camera );
}
</script>
</body>
</html>
