Ember

Warm light rises over a dark horizon, with film grain and a slow breath.

isomer.sh/effects/ember

Knobs

Continue on iPhone
Preset
#FF7A3D
1.00
0.30
0.60
Colour1
0.60
Light2
12.0
0.85
Shape2
0.95
10.0
Texture1
0.50
Follow the pointer

Drives px and py.

Still frame

What reduced motion shows: 3.4 s.

Install

Code

components/isomer/ember.tsx
'use client';
// Generated by isomer. Do not edit by hand; run `isomer add` again to update. (from packages/react/src/Ember.tsx)
// generated by packages/react/scripts/gen-components.mjs, do not edit
import type { CSSProperties } from 'react';
import { useIsomerCanvas, type Mount } from './useIsomerCanvas';
// @ts-ignore: the runtime is plain JS with no type declarations
import * as runtime from './ember.js';

const { DEFAULTS, mount } = runtime as { DEFAULTS: EmberKnobs; mount: Mount };

export interface EmberKnobs {
  accent: string;
  intensity: number;
  horizon: number;
  speed: number;
  grain: number;
  whiteHot: number;
  falloff: number;
  rimLight: number;
  planetSize: number;
  rays: number;
  px: number;
  py: number;
}

export interface EmberProps extends Partial<EmberKnobs> {
  className?: string;
  style?: CSSProperties;
  /** Render this one frame (seconds) and run no clock. Used by the parity tests. */
  time?: number;
  paused?: boolean;
  /** Draw t = 0 once when the user prefers reduced motion. Default true. */
  respectReducedMotion?: boolean;
  /** Keep each frame readable after it is shown, for canvas.toDataURL or readPixels. Read at mount. Default false. */
  preserveDrawingBuffer?: boolean;
}

export const emberDefaults: Readonly<EmberKnobs> = DEFAULTS;

export function Ember({ className, style, time, paused, respectReducedMotion, preserveDrawingBuffer, ...props }: EmberProps) {
  const knobs = { ...DEFAULTS };
  for (const k of Object.keys(DEFAULTS) as (keyof EmberKnobs)[]) {
    const v = props[k];
    if (v !== undefined) (knobs as Record<string, unknown>)[k] = v;
  }
  const ref = useIsomerCanvas({ mount, knobs, time, paused, respectReducedMotion, preserveDrawingBuffer });
  return <canvas ref={ref} className={className} style={{ display: 'block', width: '100%', height: '100%', ...style }} />;
}

Parity

iPhone 17 Pro simulator, iOS 26.3.1 against Chromium headless + SwiftShader, 15 October 2026.