Silk shader preview: Heavy satin folding slowly, a long sheen running down each fold.
ittybitty

Silk

Heavy satin folding slowly, a long sheen running down each fold.

Code

The usage always matches the preview, layers and performance settings included. No build step or package.

Copy embed gives one block to paste into any page or site builder, no setup. For your own code: add silk.js, ittybitty-shader.js, runtime.js, container.js, pointer.js, shape.js, texture.js next to this page. Highlighted values follow the controls.

<!-- Quickest: one element. Size it with CSS; it fills its box. -->
<script type="module" src="./ittybitty-shader.js"></script>
<ittybitty-shader effect="silk" style="width: 100%; height: 480px;"></ittybitty-shader>

<!-- Or with JavaScript, for full control: -->
<canvas id="silk" aria-hidden="true" style="width: 100%; height: 480px; display: block"></canvas>

<script type="module">
  import { silk } from './silk.js';

  const canvas = document.getElementById('silk');
  const effect = silk(canvas, {
    speed: 0.3,
    scale: 1,
    depth: 0.7,
    sheen: 0.8,
    angle: 30,
    style: 'satin',
    interactive: true,
    responsiveness: 0.5,
    color: '#6d3a5c',
    container: 'off',
    outline: 'itty',
    edgeLight: 0.6,
    rim: 0.6,
    gloss: 0.5,
    innerShadow: 0.5,
    // Performance
    dpr: 1,
    adaptive: true,
  });

  // Later: effect.set(…), effect.pause(), effect.resume(), effect.destroy()
</script>

Details

Folds run mostly in one direction and ripple slowly across it. The highlight is anisotropic, stretched along the folds the way light runs down real silk rather than sitting as a round spot.

Payload
8.1 KB brotli for silk.js and ittybitty-shader.js and runtime.js and container.js and pointer.js and shape.js and texture.js, measured at build time. See the method.
Resolution
Device pixel ratio capped at 1; the cloth is soft.
Frame rate
Display rate.
When unseen
Stops rendering when the canvas leaves the viewport or the tab is hidden, and resumes where it left off.
Reduced motion
Shows a single still frame. Controls still update it.
Layers
Up to five effects fuse into one shader and one draw call. Filters such as dithering and halftone process the layers beneath them.
Browsers
Any browser with WebGL2: Chrome and Edge 56+, Firefox 51+, Safari 15+.
Licence
MIT. Copy it, change it, ship it.