Iridescence `<mv-iridescence>`

Fonctionnement

Film de savon WebGL tenu à la verticale : la gravité l’amincit en haut et l’épaissit en bas, si bien que ses couleurs d’interférence s’empilent en bandes que de lents tourbillons enroulent et marbrent, et le film le plus épais se dépose en une perle de la couleur d’accent. Deux lumières en bande se reflètent dans le film ; le pointeur les fait glisser et change l’angle de vue, ce qui décale les couleurs autour de lui. Le film suit le thème : il brille en lumière réfléchie sur une page sombre et, rétroéclairé, montre ses pastels transmis sur une page claire. Il se met en pause hors écran, partage le budget de contextes WebGL de la page et garde une image fixe en mouvement réduit.

Catégorie	Arrière-plans
Type	Élément WebGL (`<mv-iridescence>`)
Statut	stable
Installe aussi	shader
Keywords	safe-rewrite, webgl, shader, iridescent, holographic, soap-film, pearl, hero

When to use

A beauty, fashion, crypto or creative brand wants a holographic, soap-film sheen as a hero backdrop
The backdrop should answer the pointer: reflections slide and colors shift where the visitor moves
The same iridescent hero must work in light (pastel, backlit) and dark (glowing) themes without extra tuning

Avoid when

The holographic look should apply to cards and buttons, not the page background → use Surface instead
A reflective liquid-metal surface is the intended look → use Liquid Chrome instead
A still section background is enough and no WebGL should run → use Backdrop instead

Installation

node scripts/add.mjs iridescence --out ./src/marvelous

Agent IA avec le serveur MCP de Marvelous UI : install_components({ slugs: ["iridescence"], target_dir: "<absolute path>/src/marvelous", framework: "react" }).

Fichiers copiés (dépendances comprises) : tokens/tokens.css, core/base.css, core/canvas.js, core/dom.js, core/element.js, core/i18n.js, core/motion.js, core/observe.js, core/webgl.js, components/shader/shader.js, components/shader/shader.css, components/iridescence/iridescence.js, components/iridescence/iridescence.css.

Utilisation

Balisage de référence : partez de celui-ci et personnalisez-le avec les attributs, data-* et les variables CSS :

<mv-iridescence data-fill></mv-iridescence>
<div style="position:relative;display:grid;place-items:center;height:100%;min-height:320px;padding:2rem 1rem;box-sizing:border-box;text-align:center;pointer-events:none">
  <div>
    <p style="margin:0;font:700 clamp(1.6rem,4vw,2.6rem)/1.1 var(--mv-font-sans);letter-spacing:-.03em;color:var(--mv-fg);text-shadow:0 0 28px var(--mv-bg),0 0 10px var(--mv-bg)">Thin as light</p>
    <p style="margin:.6rem auto 0;max-width:26rem;color:var(--mv-fg);text-shadow:0 0 16px var(--mv-bg),0 0 6px var(--mv-bg)">A soap film drains into bands of color. Move the pointer to tilt the light.</p>
  </div>
</div>

API

Attributes

Name	Type	Default	Description
`color`	CSS color	`var(--mv-accent)`	Pearl into which the thickest film settles; only its hue counts (tokens accepted, read again on theme change).
`scale`	number	`1`	Size of the swirls.
`amplitude`	number	`1`	Strength of the eddies that stir the bands (0 = flat horizontal bands).
`saturation`	number	`1`	Vividness of the interference colors (0 = a neutral sheen, max 3).
`depth`	number	`0.5`	Tonal depth: 0 = the whole film shows its colors, 1 = colors mostly where the strip lights fall.
`glint`	number	`1`	Strength of the strip-light reflections and their glare (0 = none, max 3).
`speed`	number	`1`	Time multiplier.
`paused`	boolean		Freezes the animation on the current frame.
`interactive`	boolean		Follows the pointer only over the element (otherwise across the whole window).
`dpr`	number	`1.5`	Max pixel density (capped at 2).
`data-fill`	boolean		Fills the positioned parent (absolute, inset 0).

Events

Name	Description
`mv-error`	The shader failed to compile on this GPU. detail: { message }. The element gets data-error and shows its fallback.

Content structure

Name	Description
`children`	Content placed inside the element sits above the film.

Accessibility

Decorative: the canvas is aria-hidden and never takes pointer events, and content placed inside stays in the normal reading order. The loop stops off screen and in hidden tabs; reduced motion (OS or <html data-motion="reduce">) and paused keep a still, representative frame. Without WebGL2 a still band of soap-film colors in the theme tokens is shown; forced colors and print hide the canvas. The bands are vivid and change brightness, so text placed over them needs a halo or a backing panel to stay readable.