∞ forever components

Particles & Physics

Iron Filings Field

A grid of short rods aligns to a roaming dipole magnetic field like iron filings; rods tint red/gold by nearest pole and react to pointer.

canvasmedium complexitymoderate motionpointermobile-ready

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When to use it

Science-themed hero backgrounds, physics visualizations, ambient dark-mode displays needing elegant generative motion.

When not to

Light-background UIs (background hardcoded dark). Contexts where constant field rotation competes with readable content.

Working with an AI agent

Every component ships agent-ready metadata. An example instruction for this one:

Change the dipole orbit speed by setting t+=0.025, increase rod density by lowering step divisor from 15 to 20, and change positive pole color from #f87171 to #facc15. Theme: dark tokens live in :root, the light variant in :root[data-theme="light"]; ?theme=light or a {type:'forever:theme'} postMessage switches at runtime.

Safe to edit

  • orbit speed (t += 0.012)
  • grid density (step divisor /15)
  • rod length multiplier (step*0.42)
  • pole colors (#f87171 / #C08459)
  • pointer attractor strength (80/d2)
  • trail fade opacity (0.35 in fillRect)
  • theme tokens (:root dark defaults + [data-theme=light] overrides)

Keep intact

  • angle interpolation (da wrap + f.a+=da*0.2)
  • visibilitychange pause/play
  • DPR-aware canvas sizing
  • reduced-motion guard (static frames only)
  • theme hook (?theme= bootstrap + forever:theme message listener + theme tokens)
  • demo-v1 preview lifecycle: initialize demoEnabled from window.__foreverPreview and stop attract work on the window forever:interactive event; retain manual feedback, settling, cleanup and explicit sessions

Known limitations

  • Reduced-motion path only renders two static frames then stops — no looping static fallback
  • Background color hardcoded in CSS (#0c0c0e) — must edit to change dark theme
  • State remains local to each mounted instance; format/theme remount preserves takeover, not component values.

magneticfieldparticlesphysicscanvasgenerativeambient

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