请写一段threejs网页完整代码,显示一个三角形,绕a(1,4,3) b(5,1,2)两点所在直线旋转
时间: 2023-06-13 22:06:08 浏览: 104
以下是一个使用Three.js显示一个绕a(1,4,3) b(5,1,2)两点所在直线旋转的三角形的完整代码:
```html
<!DOCTYPE html>
<html>
<head>
<title>Three.js Rotation Example</title>
<style>
body { margin: 0; }
canvas { display: block; }
</style>
</head>
<body>
<script src="https://cdn.jsdelivr.net/npm/three@0.128.0/build/three.min.js"></script>
<script>
// 创建场景、相机、渲染器
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
// 创建三角形
const geometry = new THREE.Geometry();
geometry.vertices.push(new THREE.Vector3(-1, 0, 0));
geometry.vertices.push(new THREE.Vector3(0, 1, 0));
geometry.vertices.push(new THREE.Vector3(1, 0, 0));
geometry.faces.push(new THREE.Face3(0, 1, 2));
geometry.computeFaceNormals();
const material = new THREE.MeshBasicMaterial({ color: 0xffffff });
const triangle = new THREE.Mesh(geometry, material);
scene.add(triangle);
// 计算旋转轴和角度
const a = new THREE.Vector3(1, 4, 3);
const b = new THREE.Vector3(5, 1, 2);
const line = new THREE.Line3(a, b);
const axis = new THREE.Vector3().subVectors(b, a).normalize();
const angle = Math.PI / 2; // 旋转90度
// 旋转三角形
triangle.position.copy(a); // 将三角形的位置设置为a点
triangle.position.sub(line.closestPointToPoint(triangle.position)); // 将三角形移动到直线上
triangle.rotateOnAxis(axis, angle);
// 设置相机位置
camera.position.z = 5;
// 渲染场景
function animate() {
requestAnimationFrame(animate);
renderer.render(scene, camera);
}
animate();
</script>
</body>
</html>
```
此代码会创建一个白色的三角形,并将其绕a(1,4,3) b(5,1,2)两点所在直线旋转90度。你可以将此代码保存为一个HTML文件,用浏览器打开查看。
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