How to create tubes efficiently in three.js - three.js

Question

I'm struggling to make tubes in THREE.js and there are very few tutorials on them so I decided to ask here. How can I create a tube without using this difficult piece of code taken from the official docs?
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 );
}
}
Preferably with the use of bezier curves or something intuitive.
(To be clear, I'm using React-three-fiber to create these models but I know how to convert vanilla THREE.js to it.)

Answer 1

Try it like so:
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>
The example code uses a simple quadratic bezier curve in order to generate the tube's shape.