🐟 Salmon River Run: Swim Cost, Weir Leaps and Fish-Ladder Jets

A school of sockeye salmon swims upstream past riffles, a weir and a pool-and-weir fish ladder: pick the swim speed with the lowest cost per metre, watch fatigue and leaps, and tune the ladder step height so every fish reaches the spawning gravel.

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install