调整窗口大小会导致动画加速。 （三JS）
我有以下代码，我想知道为什么当我调整窗口大小时它的速度会失控。
<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
</head>
<body>
<h1>FooBarBaz</h1>
<p>LaDeDa</p>
<script src="http://threejs.org/build/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/TrackballControls.js"></script>
<script>
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
var objects = [
{
name : "earth",
mesh : new THREE.Mesh(new THREE.SphereGeometry(1, 32, 32), new THREE.MeshPhongMaterial()),
init : function(scene){
this.mesh.position.set(0,0,0);
//this.material.map = THREE.ImageUtils.loadTexture('../earth.jpg');
scene.add(this.mesh);
},
animate : function(t){return}
},
{
name : "satellite",
mesh : new THREE.Mesh(new THREE.SphereGeometry(0.1, 32, 32), new THREE.MeshPhongMaterial()),
init : function(scene){
this.mesh.position.set(1.5,0,0);
//this.material.map = THREE.ImageUtils.loadTexture('../earth.jpg');
scene.add(this.mesh);
},
animate : function(t){this.mesh.position.set(Math.sin(t)*1.5,Math.cos(t)*1.5,0);}
}];
objects.forEach(object => object.init(scene));
var light = new THREE.HemisphereLight(0xf6e86d, 0x404040, 0.5);
scene.add(light);
camera.position.x = 0;
camera.position.y = -5;
camera.position.z = 0;
camera.lookAt(new THREE.Vector3( 0, 0, 0));
var timeStep = 0.01;
var time = 0;
var controls = new THREE.TrackballControls( camera, renderer.domElement );
controls.target.set( 0, 0, 0 );
var render = function () {
time += timeStep;
requestAnimationFrame( render );
objects.forEach(object => object.animate(time));
controls.update();
renderer.render(scene, camera);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight
camera.updateProjectionMatrix()
renderer.setSize(window.innerWidth, window.innerHeight)
render()
}
window.addEventListener('resize', onWindowResize, false)
document.body.appendChild( renderer.domElement );
render();</script>
</body>
</html>
正如您所看到的，每次调整窗口大小时，它都会变得越来越快......为什么？
I have the following code and I'm wondering why it speeds out of control when I resize the window.
<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
</head>
<body>
<h1>FooBarBaz</h1>
<p>LaDeDa</p>
<script src="http://threejs.org/build/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/TrackballControls.js"></script>
<script>
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
var objects = [
{
name : "earth",
mesh : new THREE.Mesh(new THREE.SphereGeometry(1, 32, 32), new THREE.MeshPhongMaterial()),
init : function(scene){
this.mesh.position.set(0,0,0);
//this.material.map = THREE.ImageUtils.loadTexture('../earth.jpg');
scene.add(this.mesh);
},
animate : function(t){return}
},
{
name : "satellite",
mesh : new THREE.Mesh(new THREE.SphereGeometry(0.1, 32, 32), new THREE.MeshPhongMaterial()),
init : function(scene){
this.mesh.position.set(1.5,0,0);
//this.material.map = THREE.ImageUtils.loadTexture('../earth.jpg');
scene.add(this.mesh);
},
animate : function(t){this.mesh.position.set(Math.sin(t)*1.5,Math.cos(t)*1.5,0);}
}];
objects.forEach(object => object.init(scene));
var light = new THREE.HemisphereLight(0xf6e86d, 0x404040, 0.5);
scene.add(light);
camera.position.x = 0;
camera.position.y = -5;
camera.position.z = 0;
camera.lookAt(new THREE.Vector3( 0, 0, 0));
var timeStep = 0.01;
var time = 0;
var controls = new THREE.TrackballControls( camera, renderer.domElement );
controls.target.set( 0, 0, 0 );
var render = function () {
time += timeStep;
requestAnimationFrame( render );
objects.forEach(object => object.animate(time));
controls.update();
renderer.render(scene, camera);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight
camera.updateProjectionMatrix()
renderer.setSize(window.innerWidth, window.innerHeight)
render()
}
window.addEventListener('resize', onWindowResize, false)
document.body.appendChild( renderer.domElement );
render();</script>
</body>
</html>
As you can see every time you resize the window it starts going faster and faster... Why?
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评论（1）
因为调整大小调用渲染和渲染调用请求动画帧（渲染），所以最终会出现渲染重叠的多个隐秘循环。通过添加一个不请求动画帧的函数 renderOnce 并使用它来调整大小，问题就解决了。调整大小时动画的移动速度仍会稍快，但调整大小完成后动画速度会恢复正常。
此外，调整大小时的加速可以通过将 time+=timeStep 从 renderOnce 移动到 render 来解决。
Because resize calls render and render calls request animation frame(render) you end up with multiple reclusive loops of render overlapping. By adding a function renderOnce that doesn't request animation frame and using that for resizing the problem is solved. The animation will still move slightly faster while resizing but once resizing is complete the animation speed is back to normal.
Also the acceleration while resizing can be solved by moving time+=timeStep from renderOnce to render.