Hollow County · engine playground
The engine behind Hollow County, opened up. Pull the sky apart cloud by cloud, turn the seasons, grow any tree, and call up anything that walks the county. Everything runs live in your browser, in the real game engine.
Free, no sign-in, nothing saved. Best on a desktop with a graphics card; phones work too.
Three tools, one engine
01 · Atmosphere
Every layer of the sky, live: 24 cloud forms from cumulus to aurora, the weather's own deck, rain, snow, fog and lightning. Run the clock, flip the season, or let the living climate roll the weather in spell by spell.
02 · Flora
The woods grow from 43 plant forms and the grass from the island's own density fields. Watch the leaves turn and fall, bury the meadow in snow, whip up a gale, and grow any form you like right into the scene.
03 · Entities
Spawn the dead, the wildlife and the living anywhere on the island, then follow one with the camera. Cycle coats and outfits, change how they move, and rebuild a zombie part by part.
Start somewhere
Hand-picked places across the county's worlds. Each is the same island every visit.
Under the hood
Hollow County is plain JavaScript and three.js with no build step. Every island is raised from a seed in a worker; every colour is a step on a hand-tuned palette ramp; every tree, cloud and creature is grown from a recipe.
The world is drawn about 400 rows tall, then scaled up by a whole number so each game pixel is a crisp square. Light snaps to the steps of a colour ramp, with a thin dither between.
Clouds are ray-marched in up to eight steps through layered slabs: heaps with flat bases, veils, mackerel cells and towers on the horizon. The low ones cast real shadows on the land.
Weather comes in spells that lead into each other the way weather does. Seasons turn on the game's clock: leaves fall, snow settles and melts, the grass goes to straw.
