Flocking Boids
Watch emergent flocking behavior as hundreds of boids follow simple rules to create complex swarm patterns.
About Flocking Boids
Hundreds of small agents — called boids — dart across the screen, each following just three rules: stay close to neighbors, avoid collisions, and match the group's direction. From those simple instructions, something genuinely surprising emerges: tight wheeling flocks that split around obstacles, rejoin, and ripple like a murmuration of starlings. No central controller coordinates any of it.
This is a classic of interactive simulation design, originally formalized by Craig Reynolds in 1986, and it holds up as a fascinating thing to just watch. You can also nudge the sliders — separation, alignment, cohesion — and immediately see how a small tweak collapses a graceful flock into a chaotic scatter or a tight, panicked cluster. If emergent group behavior interests you, Ant Colony shows a similar principle playing out through pheromone trails and pathfinding.
Works best on a larger screen where you can appreciate the full sweep of the swarm; the effect loses some of its drama on small phone displays.
Look inside
How to use
Watch bird-like particles (boids) move and flock together in this physics simulation. **Getting Started:** • Click anywhere to start the simulation • Observe how boids naturally form flocks by following their neighbors **Controls:** • **Mouse**: Move cursor to attract boids (if mouse following is enabled) • **P**: Pause/unpause simulation • **R**: Reset simulation • **A/D**: Add or remove boids • **+/-**: Speed up or slow down simulation • **Arrow keys**: Change boid size (up/down) or cycle through focused boids (left/right) • **J/K**: Decrease/increase interaction radius • **N/M**: Adjust noise (randomness in movement) • **F**: Focus on individual boid to see its stats • **I**: Toggle visibility of interaction radius • **S**: Save current frame as image **Customization:** • Click the menu icons (top-left) to open control panels • Adjust parameters like number of boids, speed, and interaction distance using sliders • Change spawn patterns, colors, trail effects, and wall behavior • Set boids to follow your mouse or ignore it The simulation demonstrates emergent flocking behavior - complex group patterns arising from simple individual rules.
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