Presets

Flock

Boid count800 Perception radius50 Max speed120 Max force400

Rule weights

Separation1.5 Zero it and boids stop avoiding each other, so the flock overlaps into one clump. Alignment1.0 Zero it and neighbors stop matching heading; the flock churns instead of streaming. Cohesion1.0 Zero it and the flock never gathers; boids drift apart into separate clumps.

Mouse

Predator

Enable predator Predator count1 Predator speed170 Predator radius90 Click the canvas any time for a scatter predator: it chases the nearest boid, then fades after a few seconds and the flock re-forms.

Render

Obstacles

With draw mode on, drag on the canvas to place an obstacle; right-click clears them, and so does Escape.

Reproduce

Seed

Reseed

Copy shareable link