用threejs 写小球轨道运行的代码
时间: 2024-06-08 21:01:19 浏览: 4
好的,以下是使用threejs写小球轨道运行的代码示例:
```javascript
// 创建场景
var scene = new THREE.Scene();
// 创建相机
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.set(0, 0, 10);
// 创建渲染器
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
// 创建空间曲线
var curve = new THREE.EllipseCurve(
0, 0, // x, y 中心点
5, 5, // x, y 半径
0, 2 * Math.PI, // 起始角度, 终止角度
false, // 逆时针方向
0 // 旋转角度
);
// 创建曲线路径
var path = new THREE.Path(curve.getPoints(100));
// 创建轨道线
var geometry = path.createPointsGeometry(100);
var material = new THREE.LineBasicMaterial({ color: 0xffffff });
var line = new THREE.Line(geometry, material);
scene.add(line);
// 创建小球
var sphereGeometry = new THREE.SphereGeometry(0.2, 32, 32);
var sphereMaterial = new THREE.MeshBasicMaterial({ color: 0xff0000 });
var sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);
scene.add(sphere);
// 让小球沿着曲线运动
var t = 0;
function animate() {
requestAnimationFrame(animate);
t += 0.01;
var point = curve.getPoint(t);
sphere.position.x = point.x;
sphere.position.y = point.y;
sphere.position.z = 0;
renderer.render(scene, camera);
}
animate();
```
希望这个代码示例对你有帮助!
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