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HTML 

              
                <script type="importmap">
  {
    "imports": {
      "three": "https://esm.sh/three@0.175.0/build/three.module.js",
      "three/addons/": "https://esm.sh/three@0.175.0/examples/jsm/"
    }
  }
</script>
!

CSS 

              
                body{
  overflow: hidden;
  margin: 0;
}
!

JS 

              
                import * as THREE from "three";
import { OrbitControls } from "three/addons/controls/OrbitControls.js";
import { mergeGeometries } from "three/addons/utils/BufferGeometryUtils.js";

console.clear();

class HelixCurve extends THREE.Curve {
  constructor(
    rBottom = 5,
    rTop = 7,
    yBottom = -7,
    yTop = 7,
    turns = 12,
    loose = 1,
    scale = 1
  ) {
    super();
    this.scale = scale;
    this.rBottom = rBottom;
    this.rTop = rTop;
    this.yBottom = yBottom;
    this.yTop = yTop;
    this.turns = turns;
    this.loose = loose;
  }

  getPoint(t, optionalTarget = new THREE.Vector3()) {
    let elevStart = this.yBottom;
    let elevation = (this.yTop - this.yBottom) * t ** this.loose;
    let radiusChange = (this.rTop - this.rBottom) * t + this.rBottom;
    let angleChagne = this.turns * Math.PI * 2 * t;

    return optionalTarget
      .set(
        Math.cos(angleChagne) * radiusChange,
        elevStart + elevation,
        Math.sin(-angleChagne) * radiusChange
      )
      .multiplyScalar(this.scale);
  }
}

class TubeGeometryExt extends THREE.BufferGeometry {
  constructor(
    path = new THREE.QuadraticBezierCurve3(
      new THREE.Vector3(-1, -1, 0),
      new THREE.Vector3(-1, 1, 0),
      new THREE.Vector3(1, 1, 0)
    ),
    tubularSegments = 64,
    radius = 1,
    radialSegments = 8,
    closed = false,
    capped = false,
    RGenerator = function (i, j) {
      return 1;
    }
  ) {
    super();

    this.type = "TubeGeometry";

    this.parameters = {
      path: path,
      tubularSegments: tubularSegments,
      radius: radius,
      radialSegments: radialSegments,
      closed: closed,
      capped: closed == true ? false : capped,
      RGenerator: RGenerator
    };

    const frames = path.computeFrenetFrames(tubularSegments, closed);

    // expose internals

    this.tangents = frames.tangents;
    this.normals = frames.normals;
    this.binormals = frames.binormals;

    // helper variables

    const vertex = new THREE.Vector3();
    const normal = new THREE.Vector3();
    const uv = new THREE.Vector2();
    let P = new THREE.Vector3();

    // buffer

    const vertices = [];
    const normals = [];
    const uvs = [];
    const indices = [];

    // create buffer data

    generateBufferData();

    // build geometry

    this.setIndex(indices);
    this.setAttribute(
      "position",
      new THREE.Float32BufferAttribute(vertices, 3)
    );
    this.setAttribute("normal", new THREE.Float32BufferAttribute(normals, 3));
    this.setAttribute("uv", new THREE.Float32BufferAttribute(uvs, 2));
    this.computeVertexNormals();

    // correct seam normals
    let n1 = new THREE.Vector3();
    let n2 = new THREE.Vector3();
    let n = new THREE.Vector3();
    let nor = this.attributes.normal;
    for (let i = 0; i <= tubularSegments; i++) {
      let idx1 = i * (radialSegments + 1);
      let idx2 = i * (radialSegments + 1) + radialSegments;

      n1.fromBufferAttribute(nor, idx1);
      n2.fromBufferAttribute(nor, idx2);

      n.addVectors(n1, n2).multiplyScalar(0.5).normalize();

      nor.setXYZ(idx1, n.x, n.y, n.z);
      nor.setXYZ(idx2, n.x, n.y, n.z);
    }
    //////////////////////

    if (this.parameters.capped == true) {
      this.copy(
        mergeGeometries(
          [this, getCap(0, 0), getCap(this.parameters.tubularSegments + 1, 1)],
          true
        )
      );
    }

    // functions

    function getCap(segmentIndex, t) {
      let startIdx = segmentIndex * radialSegments;
      let endIdx = (segmentIndex + 1) * radialSegments;
      let verticesPart =
        t > 0
          ? vertices.slice(-(radialSegments + 1) * 3)
          : vertices.slice(0, (radialSegments + 1) * 3);

      let positions = [...path.getPointAt(t), ...verticesPart];

      let capG = new THREE.BufferGeometry();
      capG.setAttribute(
        "position",
        new THREE.Float32BufferAttribute(positions, 3)
      );

      let uvs = [0.5, 0.5];
      for (let iUV = 0; iUV <= radialSegments; iUV++) {
        let a = (iUV / radialSegments) * Math.PI * 2;
        uvs.push(Math.cos(a) * 0.5 + 0.5, Math.sin(a) * 0.5 + 0.5);
      }
      capG.setAttribute("uv", new THREE.Float32BufferAttribute(uvs, 2));

      let indices = Array.from({ length: radialSegments }, (_, idx) => {
        return [0, idx + 1, idx + 2];
      }).flat();

      if (segmentIndex != 0) {
        indices = indices.reverse();
      }
      capG.setIndex(indices);
      capG.computeVertexNormals();

      return capG;
    }

    function generateBufferData() {
      for (let i = 0; i < tubularSegments; i++) {
        generateSegment(i);
      }

      generateSegment(closed === false ? tubularSegments : 0);

      generateUVs();

      generateIndices();
    }

    function generateSegment(i) {
      P = path.getPointAt(i / tubularSegments, P);

      const N = frames.normals[i];
      const B = frames.binormals[i];

      for (let j = 0; j <= radialSegments; j++) {
        const v = (j / radialSegments) * Math.PI * 2;

        const sin = Math.sin(v);
        const cos = -Math.cos(v);

        let rScale = RGenerator(i / tubularSegments, v);

        normal.x = cos * N.x + sin * B.x;
        normal.y = cos * N.y + sin * B.y;
        normal.z = cos * N.z + sin * B.z;
        normal.normalize();
        normals.push(normal.x, normal.y, normal.z);

        vertex.x = P.x + radius * rScale * normal.x;
        vertex.y = P.y + radius * rScale * normal.y;
        vertex.z = P.z + radius * rScale * normal.z;
        vertices.push(vertex.x, vertex.y, vertex.z);
      }
    }

    function generateIndices() {
      for (let j = 1; j <= tubularSegments; j++) {
        for (let i = 1; i <= radialSegments; i++) {
          const a = (radialSegments + 1) * (j - 1) + (i - 1);
          const b = (radialSegments + 1) * j + (i - 1);
          const c = (radialSegments + 1) * j + i;
          const d = (radialSegments + 1) * (j - 1) + i;

          indices.push(a, b, d);
          indices.push(b, c, d);
        }
      }
    }

    function generateUVs() {
      for (let i = 0; i <= tubularSegments; i++) {
        for (let j = 0; j <= radialSegments; j++) {
          uv.x = i / tubularSegments;
          uv.y = j / radialSegments;

          uvs.push(uv.x, uv.y);
        }
      }
    }
  }
}

let gu = {
  time: {
    value: 0
  }
};
let dpr = Math.min(devicePixelRatio, 1);
let scene = new THREE.Scene();
scene.background = new THREE.Color(0xface8d);
let camera = new THREE.PerspectiveCamera(
  45,
  innerWidth / innerHeight,
  0.1,
  100
);
camera.position.set(0, 0.2, 1).setLength(32);
let renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(devicePixelRatio);
renderer.setSize(innerWidth * dpr, innerHeight * dpr);
document.body.appendChild(renderer.domElement);

window.addEventListener("resize", (event) => {
  camera.aspect = innerWidth / innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(innerWidth * dpr, innerHeight * dpr);
});

let controls = new OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;

let light = new THREE.DirectionalLight(0xffffff, Math.PI * 1.5);
light.position.setScalar(1);
scene.add(light, new THREE.AmbientLight(0xffffff, Math.PI * 0.5));

// stuff
let glassCurves = [
  {
    curve: new HelixCurve(5, 8, -12, 7, 4, 1.25),
    color: "yellow",
    radius: 1,
    segmentation: 50,
    swaying: 10
  },
  {
    curve: new HelixCurve(8, 2, 7, 10, 2.5, 1),
    color: "white",
    radius: 0.75,
    segmentation: 30,
    swaying: 10
  },
  //J
  {
    curve: new THREE.CatmullRomCurve3(
      new THREE.CubicBezierCurve(
        new THREE.Vector2(-2, 5),
        new THREE.Vector2(-1, -5),
        new THREE.Vector2(-1, -5),
        new THREE.Vector2(-5, -5)
      )
        .getSpacedPoints(10)
        .map((p) => {
          return new THREE.Vector3(...p).setZ(0);
        })
    ),
    color: "maroon",
    radius: 0.75,
    segmentation: 10,
    swaying: 3
  },
  //S
  {
    curve: new THREE.CatmullRomCurve3(
      [
        [5, 5],
        [1, 2],
        [5, -2],
        [1, -5]
      ].map((p) => {
        return new THREE.Vector3(...p).setZ(0);
      }),
      false,
      "catmullrom",
      1
    ),
    color: "maroon",
    radius: 0.75,
    segmentation: 10,
    swaying: 3
  }
];

glassCurves.forEach((curve) => {
  let radiusCurve = new THREE.CatmullRomCurve3(
    Array.from({ length: curve.segmentation }, (_, idx) => {
      let r = (Math.random() * 0.75 + 0.25) * 1.5;
      r = idx == 0 || idx == curve.segmentation - 1 ? 0 : r;
      return new THREE.Vector3(idx, r, 0);
    })
  );

  let tubeCurve = curve.curve;

  let g = new TubeGeometryExt(
    tubeCurve,
    1000,
    curve.radius,
    100,
    false,
    false,

    function (i, j) {
      // [0..1], [0..2PI]
      let r = radiusCurve.getPoint(i).y;
      let swaying = Math.sin(Math.PI * 2 * curve.swaying * i) * Math.PI * 2;
      r *= Math.sin(j * 5 + swaying) * 0.5 + 0.5 + 0.5;
      return r;
    }
    /**/
  );
  let m = new THREE.MeshLambertMaterial({
    color: curve.color,
    wireframe: false
  });
  let o = new THREE.Mesh(g, m);
  o.position.y = 1;
  scene.add(o);
});

////////

let clock = new THREE.Clock();
let t = 0;

renderer.setAnimationLoop(() => {
  let dt = clock.getDelta();
  t += dt;
  gu.time.value = t;
  controls.update();

  renderer.render(scene, camera);
});
!
999px

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