Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using it's URL and the proper URL extention.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <script async src="https://ga.jspm.io/npm:es-module-shims@1.4.3/dist/es-module-shims.js" crossorigin="anonymous"></script>
<script type='importmap-shim'>
  {
    "imports": {
      "three": "https://unpkg.com/three@0.138.3/build/three.module.js",
      "three/": "https://unpkg.com/three@0.138.3/",
      "omega/": "https://cdn.jsdelivr.net/gh/ycw/omega@0.0.2/",
      "postprocessing/": "https://unpkg.com/postprocessing@6.26.0/"
    }
  }
</script>
<script defer type='module-shim'>
import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'
import { Strip, StripGeometry, StripHelper, UvPreset } from 'omega/dist/Strip.js'
import * as PP from 'postprocessing/build/postprocessing.esm.js'

// ----
// main
// ----

const renderer = new THREE.WebGLRenderer();
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, 2, .1, 100);
const controls = new OrbitControls(camera, renderer.domElement);

scene.background = new THREE.Color('white');
controls.target.set(0, .8, 0);
camera.position.set(1, 1, .8);
controls.autoRotate = true;
controls.enableDamping = true;
renderer.shadowMap.enabled = true;

const light = new THREE.DirectionalLight('white', 1);
light.position.set(2, 2, 1);
scene.add(light);
light.castShadow = true;
light.shadow.bias = -0.0001;
scene.add(new THREE.AmbientLight('white', 1));

const N_SEG = 20;
const BREADTH = .5;
const curve = new THREE.CatmullRomCurve3([
  new THREE.Vector3(0, 1, 0),
  new THREE.Vector3(0, 0, 0),
  new THREE.Vector3(0, -1, 0),
  new THREE.Vector3(0, -2, 0),
], false);
const radius_fn = (i, I) => .2 + 1.5 * i / I;
const tilt_fn = (i, I) => 5 * Math.PI * i / I + Math.PI * .5;
const strip = new Strip(curve, radius_fn, tilt_fn);
const frames = strip.computeFrames(N_SEG);
const strip_geom = new StripGeometry(strip, N_SEG);
// scene.add(new StripHelper(strip, N_SEG));


function f(strip_geom, radius_fn, frames, result) { // random pos lying on strip
  const ab_pos = strip_geom.getAttribute('position').array;
  const n_idx = ab_pos.length / 6; // /3/2
  const idx = Math.random() * n_idx | 0;
  const pa = new THREE.Vector3(...ab_pos.subarray(idx * 6, idx * 6 + 3));
  const pb = new THREE.Vector3(...ab_pos.subarray(idx * 6 + 3, idx * 6 + 6));
  const pa2pb = new THREE.Vector3().subVectors(pb, pa);
  const len = 2 * radius_fn(idx, n_idx);
  pa2pb.normalize().multiplyScalar(len * Math.random());
  pa.add(pa2pb);
  const [B, N, T] = frames[idx];
  result.makeBasis(B, N, T).setPosition(pa);
}

// texture by Lena Albers - https://unsplash.com/photos/px-JsA27fbQ
const url = 'https://images.unsplash.com/photo-1628071616999-0660c371c465?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxlZGl0b3JpYWwtZmVlZHw4MXx8fGVufDB8fHx8&auto=format&fit=crop&w=500&q=60';
const tex = new THREE.TextureLoader().load(url);
{ // https://codepen.io/ycw/pen/KKZgPyB
  const N_INST = 1000;
  const strip = new Strip(new THREE.CatmullRomCurve3([
    new THREE.Vector3(.2, .2, 0),
    new THREE.Vector3(.4, .5, 0),
    new THREE.Vector3(.4, .1, 0),
    new THREE.Vector3(0, 0, 0),
  ]), (i, I) => .5 * (i / I), (i, I) => Math.PI * 0.4 * i / I);
  const geom = new StripGeometry(strip, 32, UvPreset.strip[0]);
  const mat = new THREE.MeshPhysicalMaterial({ map: tex, side: THREE.DoubleSide, roughness: 1, alphaMap: tex, alphaTest: .2 });
  const mesh = new THREE.InstancedMesh(geom, mat, N_INST);
  const $mat_basis = new THREE.Matrix4();
  const $mat_r = new THREE.Matrix4(); // ry
  const $mat_s = new THREE.Matrix4(); // scale
  const $col = new THREE.Color();
  for (let i = 0; i < N_INST; ++i) {
    $mat_r.makeRotationY(Math.PI * Math.random() * 2);
    $mat_s.makeScale(Math.random(), Math.random(), Math.random());
    f(strip_geom, radius_fn, frames, $mat_basis);
    mesh.setMatrixAt(i, $mat_basis.multiply($mat_r).multiply($mat_s));
    mesh.setColorAt(i, $col.setHSL(Math.random(), .5, .5 + .5 * Math.random()));
  }
  scene.add(mesh);
  mesh.castShadow = true;
  mesh.receiveShadow = true;
}

{
  const geom = new THREE.CylinderGeometry(.1, .1, 2.6);
  const mat = new THREE.MeshPhysicalMaterial({ roughness: 1, map: tex, color: '#222' });
  const mesh = new THREE.Mesh(geom, mat);
  scene.add(mesh);
}

// ----
// render
// ----

const composer = new PP.EffectComposer(renderer);
composer.addPass(new PP.RenderPass(scene, camera));
composer.addPass(new PP.EffectPass(
  camera,
  new PP.BrightnessContrastEffect({ contrast: +.5 }),
  new PP.BloomEffect({
    luminanceThreshold: .1,
    intensity: 1
  })
));

renderer.setAnimationLoop((t) => {
  composer.render();
  controls.update();
  tex.offset.y = -1 + Math.min(t * 0.00033, 2)/2;
});

// ----
// view
// ----

function resize(w, h, dpr = devicePixelRatio) {
  composer.setSize(w, h);
  camera.aspect = w / h;
  camera.updateProjectionMatrix();
}
addEventListener('resize', () => resize(innerWidth, innerHeight));
dispatchEvent(new Event('resize'));
document.body.prepend(renderer.domElement);
</script>
              
            
!

CSS

              
                canvas {
  display: block; width: 100%; height: 100vh;
  cursor: grab;
  position: fixed; top: 0; left: 0;
}

              
            
!

JS

              
                
              
            
!
999px

Console