如何在three.js中高效地创建管

Question

我正在努力在THREE.js中制作管道，并且很少有关于它们的教程，所以我决定在这里问一下。如何在不使用这段从官方文档中获取的复杂代码的情况下创建一个管道?

class CustomSinCurve extends THREE.Curve {
constructor( scale = 1 ) {
super();
this.scale = scale;
}
getPoint( t, optionalTarget = new THREE.Vector3() ) {
const tx = t * 3 - 1.5;
const ty = Math.sin( 2 * Math.PI * t );
const tz = 0;
return optionalTarget.set( tx, ty, tz ).multiplyScalar( this.scale );
}
}

最好使用贝塞尔曲线或一些直观的东西。(为了明确，我使用React-three-fiber来创建这些模型，但我知道如何将香草THREE.js转换为它。)

Answer 1

试一下:

let mesh;
let camera, scene, renderer;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 0.01, 10);
camera.position.z = 4;
scene = new THREE.Scene();
const curve = new THREE.QuadraticBezierCurve3(new THREE.Vector3(-1, -1, 0), new THREE.Vector3(-1, 1, 0), new THREE.Vector3(1, 1, 0))
const geometry = new THREE.TubeGeometry(curve);
const material = new THREE.MeshNormalMaterial({
side: THREE.DoubleSide
});
mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

}
function animate() {
requestAnimationFrame(animate);
mesh.rotation.y += 0.01;
renderer.render(scene, camera);
}

body {
margin: 0;
}

<script src="https://cdn.jsdelivr.net/npm/three@0.133.1/build/three.min.js"></script>

示例代码使用简单的二次bezier曲线来生成管的形状。