three.js画布，球体向右旋转或浮动
three.js画布，球体向右旋转或浮动
提问于 2017-07-04 17:20:53
我试着让球体以非常慢的速度向右转。这是我的源代码:我创建了一个新的contaier，里面有canvas，你可以看到代码。我要说的是球体以慢节奏转动吗？这里我也在github上有我的git存储库:查看https://github.com/SpaceG/SpaceSphere中的图像。在这里我还发现了另一个例子，用一个球体:这个圆球在同一个点上非常慢地转动了一个浮动，这是我需要的:在下面的代码中http://rectangleworld.com/demos/DustySphere/DustySphere.html这个向左转我需要的]。你也可以下载我的repo或者fork它，并在这里修复我的问题。
这是Html文档：
<!DOCTYPE html>
<html lang="en">
<head>
<title></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 {
background-color: #000000;
margin: 0px;
overflow: hidden;
}
a {
color:#0078ff;
}
</style>
<script src="../build/three.js"></script>
<script src="js/renderers/Projector.js"></script>
<script src="js/renderers/CanvasRenderer.js"></script>
</head>
<body>实现Sphere的Javascript代码：
<script>
var SCREEN_WIDTH = window.innerWidth,
SCREEN_HEIGHT = window.innerHeight,
mouseX = 0, mouseY = 0,
windowHalfX = window.innerWidth / 4,
windowHalfY = window.innerHeight / 4,
SEPARATION = 600,
AMOUNTX = 10,
AMOUNTY = 10,
camera, scene, renderer;
init();
animate();
function init() {
var container, turnAngle, separation = 100, amountX = 50, amountY = 50,
particles, particle;
container = document.createElement('div');
container.setAttribute('class', 'space-id');
document.body.appendChild(container);
camera = new THREE.PerspectiveCamera( 275, SCREEN_WIDTH / SCREEN_HEIGHT, 5, 10000000 );
camera.position.z = 100;
scene = new THREE.Scene();
renderer = new THREE.CanvasRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );
container.appendChild( renderer.domElement );
// particles
var PI2 = Math.PI * 2;
var material = new THREE.SpriteCanvasMaterial( {
color: 0xffffff,
program: function ( context ) {
context.beginPath();
context.arc( 0, 0, 0.5, 0, PI2, true );
context.fill();
}
} );
for ( var i = 0; i < 1000; i ++ ) {
particle = new THREE.Sprite( material );
particle.position.x = Math.random() * 2 - 1;
particle.position.y = Math.random() * 2 - 1;
particle.position.z = Math.random() * 2 - 1;
particle.position.normalize();
particle.position.multiplyScalar( Math.random() * 10 + 450 );
particle.scale.multiplyScalar( 2 );
scene.add( particle );
}
// lines
for (var i = 0; i < 300; i++) {
var geometry = new THREE.Geometry();
var vertex = new THREE.Vector3( Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1 );
vertex.normalize();
vertex.multiplyScalar( 450 );
geometry.vertices.push( vertex );
var vertex2 = vertex.clone();
vertex2.multiplyScalar( Math.random() * 0.3 + 1 );
geometry.vertices.push( vertex2 );
var line = new THREE.Line( geometry, new THREE.LineBasicMaterial( { color: 0xffffff, opacity: Math.random() } ) );
scene.add( line );
}
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
windowHalfX = window.innerWidth / 4;
windowHalfY = window.innerHeight / 4;
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
//
function onDocumentMouseMove(event) {
mouseX = event.clientX - windowHalfX;
mouseY = event.clientY - windowHalfY;
}
function onDocumentTouchStart( event ) {
if ( event.touches.length > 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
//
function animate() {
requestAnimationFrame( animate );
render();
}
function render() {
camera.position.x += ( mouseX - camera.position.x ) * .05;
camera.position.y += ( - mouseY + 200 - camera.position.y ) * .05;
camera.lookAt( scene.position );
renderer.render( scene, camera );
}
</script>
</body>
</html>这是一张关于项目目标的图片，圆球在缓慢的节奏中向左转，这里有人给我提示吗？让好的工作做好。谢谢你。
回答 1
Stack Overflow用户
发布于 2017-07-05 04:33:59
如果只想让球像示例中那样旋转，可以执行以下操作：
// Declare these before the call to init();
var group = new THREE.Group();
var rotationSpeed = 0.001; // Increase/decrease to control speed of rotation.而且，不是scene.add(particle);，而是
你做了group.add(particle);
然后是scene.add(group);
这几行也是一样的：
代替scene.add(line);
执行group.add(line); (这里您不需要添加到场景中，因为您正在添加到场景中已存在的组中。)
然后是渲染循环中缺少的关键行：
group.rotateY(rotationSpeed); // Rotates the ball with speed 'rotationSpeed'下面是这些更改的一些细节：JSFiddle
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/44901954
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