∞ forever components

Particles & Physics

Smoke Vortex Street

300 teal smoke streamlines flow past an invisible cylinder, shedding alternating Karman vortices; pointer repels nearby particles revealing the swirling wake.

canvasheavy complexitymoderate motionpointer

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When to use it

Dark ambient backgrounds, fluid-dynamics demos, science or generative-art hero sections.

When not to

Light-background UIs (background is hardcoded dark teal-black). Contexts where pointer interaction competes with UI elements above the canvas.

Working with an AI agent

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

Change the smoke color to a warm amber palette by editing the strokeStyle line: replace (40+heat*70|0),(150+heat*60|0),(150+heat*40|0) with (220+heat*35|0),(120+heat*80|0),(20+heat*20|0). 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

  • particle count (N=300)
  • obstacle position (oX=W*0.30, oY=H*0.5)
  • obstacle radius (oR=sc*0.07)
  • eddy shed period (period=58)
  • base flow speed (sc*0.0016)
  • smoke color (strokeStyle heat ramp)
  • theme tokens (:root dark defaults + [data-theme=light] overrides)

Keep intact

  • IIFE wrapper
  • prefers-reduced-motion guard and static fallback
  • visibilitychange pause/start
  • DPR-aware canvas sizing
  • theme hook (?theme= bootstrap + forever:theme message listener + theme tokens)

Known limitations

  • Background color is hardcoded in CSS (#0a1416) — must edit to use on non-dark themes
  • Eddy shedding uses integer modulo (t%period===0) so period must be an integer
  • Reduced-motion path runs 160 static frames then halts — result may look sparse on large viewports

smokefluidvortexkarman-streetparticlesphysicsambient

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