Frost

Window frost grows inward from the edges of cold dark glass.

isomer.sh/effects/frost

Knobs

Continue on iPhone
Preset
#9FD8FF
0.88
0.75
12.0
Colour2
0.60
0.08
Light1
0.45
Shape3
75
120
0.32
Texture2
0.16
0.03
Still frame

What reduced motion shows: 20 s.

Install

Code

components/isomer/frost.tsx
'use client';
// Generated by isomer. Do not edit by hand; run `isomer add` again to update. (from packages/react/src/Frost.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 './frost.js';

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

export interface FrostKnobs {
  accent: string;
  coverage: number;
  branchiness: number;
  growth: number;
  grain: number;
  frostWhite: number;
  glassTone: number;
  crystalGlow: number;
  ragged: number;
  boughLength: number;
  pioneers: number;
  mist: number;
}

export interface FrostProps extends Partial<FrostKnobs> {
  className?: string;
  style?: CSSProperties;
  /** Render this one frame (seconds) and run no clock. Used by the parity tests. */
  time?: number;
  paused?: boolean;
  /** The clock stops at t = 20 and holds that frame. Draw t = 20 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 frostDefaults: Readonly<FrostKnobs> = DEFAULTS;

export function Frost({ className, style, time, paused, respectReducedMotion, preserveDrawingBuffer, ...props }: FrostProps) {
  const knobs = { ...DEFAULTS };
  for (const k of Object.keys(DEFAULTS) as (keyof FrostKnobs)[]) {
    const v = props[k];
    if (v !== undefined) (knobs as Record<string, unknown>)[k] = v;
  }
  const ref = useIsomerCanvas({ mount, knobs, time, paused, respectReducedMotion, preserveDrawingBuffer, posterTime: 20.0, settleAt: 20.0 });
  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.