Molten flow

Swirling caustic filaments glow from deep violet to white-hot, heat up under the pointer and flare outward on click.

element
fire
metal
caustics
pointer
shader
since 0.2

Background Studio: tune it below, then copy the code

Your system asks for reduced motion: the demo shows its final state and nothing moves.

Live demo

Molten flow example

Code

It follows the controls above: change an option and the code changes with it.

<script src="https://search.axi0.io/axi0/motion/motion.js" defer></script>

<axi0-molten-flow cover></axi0-molten-flow>

import { MoltenFlow } from "./motion/react/MoltenFlow";

<MoltenFlow />

<script setup lang="ts">
import MoltenFlow from "./motion/vue/MoltenFlow.vue";
</script>

<template>
  <MoltenFlow />
</template>

const fx = document.createElement("axi0-molten-flow");
document.querySelector("#hero").append(fx);

The wrappers: MoltenFlow.tsx (React, TypeScript) and MoltenFlow.vue (Vue). Both render the same attributes as the HTML; the loader does the rest.

Options

Attribute	Default	What it does
`scale`	`1`	Size of the swirls
`heat`	`1`	How hot the pointer makes the flow
`colors`	auto	Colors, comma separated (empty: the palette for the page's theme)
`background`	auto	Background color (empty: the theme's)
`speed`	`1`	How fast it moves
`theme`	`auto`	Light or dark palette (auto: from the page behind it)
`cover`	`false`	Fill the nearest positioned parent, behind its content

Decorative: the canvas is aria-hidden and takes no focus; with cover it ignores the pointer, so the content above it stays clickable and readable. With no pointer the hot spot wanders on its own, so touch and keyboard users see the same scene; a tap flares like a click. Drawn by the shared WebGL runner below device resolution (never more than one pixel per CSS pixel, device pixel ratio capped at 2); it starts when it comes within 300 px of the screen, the frame loop stops off screen and in hidden tabs, and reduced motion draws one still frame with no movement. Without WebGL it shows a still gradient in its own colors.

Size

molten-flow.js is 0.7 KB gzip, with gl.js 2.1 KB and backgrounds-kit.js 3.4 KB it needs. A page loads the loader (2.9 KB) and core.js (1.4 KB) once, whatever it uses.