One wind field
Grass, trees, the cloth flags and the drifting cloud shadows all sample the same WindSystem — gusts travel visibly across everything at once.
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Falcra
My JavaScript game engine — ECS, worker-parallel simulation, three.js/WebGPU — with a live scene from the colony-defense game built on it.
Live scene
This is not a video — it is the engine itself, running in your browser. Launch it, move the villager, open the tuning panel, flip the storm on.
What you're looking at
Worker-parallel simulation
Movement, collision and pathfinding run in Web Workers over SharedArrayBuffer typed arrays — the render thread never blocks on the sim.
Real pathfinding
Right-click and the villager routes with A* over the occupancy grid — cliffs, trees, rocks and the town hall all block; ramps carry it up the plateaus.
Ambient wildlife
Ground flocks, tree perchers and crane formations — walk the villager into a flock and it bursts, circles, then re-lands.
Storm mode
One toggle: world-anchored rain under the clouds, lightning bolts dropping from the deck with their own light, wet ground, whipping wind.
GPU cloth
The town-hall flags are simulated in WebGPU compute — particle buffers, per-frame constraint solve, aero pressure and flutter.
The engine
Falcra is my JavaScript game engine for real-time multiplayer browser games. It ships nothing game-specific — only the primitives — and powers a small fleet of prototypes; the simulation scales to thousands of entities without blocking the render thread.
Data-oriented ECS
World → Entity → Node tree with tick-driven systems; components are plain typed-array views.
Mixin composition
Capabilities are mixins (built on sools) that declare their dependencies; the mixer resolves and applies them in order.
Split entity / render
Every feature has an entity-side system (pure simulation) and an optional render-side system (three.js / WebGPU, TSL).
Multiplayer built in
Client/server systems, state sync and an RPC layer ship with the engine — plus 1–2 player local split-screen.
The game built on it
On top of the engine I am building a colony-defense survival game: by day you run a villager economy and build up the settlement; by night you defend it against escalating waves of enemies. It is mechanically complete and playable end-to-end — win by surviving the night count, lose if the town hall falls — with a persistent hero roster, loadouts, hub progression between runs, and 1–2 player local split-screen co-op.