Summit Line
A stout green locomotive and two red wagons lap a two-hundred-metre mountain loop that exists only as numbers: the track is integrated heading by heading with a real elevation profile, and the rails, sleepers, gravel embankments and trestle posts are all generated from the same path samples — low sections get an earthen bed, the summit span gets a wooden viaduct. The train rides the loop by arc length, each vehicle pitched to its own local grade, speed bleeding away on the climb and running free on the descent while the chimney puffs harder uphill. And the wheels are honest: every audit compares cumulative wheel revolutions against distance over two-pi-r, and they match to the decimal. V cycles chase, trackside and overhead cameras.
Play it now
Desktop: V cycles chase / trackside / overhead cameras, drag orbits · Phone: drag to orbit
The concept is the contract
The piece was concepted first — an AI key-art painting — and its hero assets were then code-modeled in headless Blender and audited against that concept. The pair below is the contract and the build.
Concept prompt
A cheerful little alpine cog railway train — a stout forest-green locomotive with a brass boiler band, red cowcatcher and a puffing chimney, pulling two open red passenger wagons — climbing a winding mountain track through pine trees in crisp morning light, crossing a short wooden trestle bridge over a rocky gully, snow-dusted peaks behind, white smoke puffs trailing, high-end stylized 3D game render, no text, no watermark, no UI.
Code-modeled in Blender
The hero assets were modelled by agents writing Blender code against the platform sculpt kit — no downloaded models anywhere — and rendered by the studio harness for audit before entering the engine scene.
Made by AI, compiled by the real Unity 6 engine
The locomotive, wagon and pine are code-modeled Blender exports — one wagon feeds both cars, one pine feeds a forty-two-tree forest scattered clear of the rail corridor by distance checks against the path samples. Every wheel is a name-grouped assembly regrouped at a modeled pivot locator and spun at exactly ground speed over its radius. The rocky gully sits under the loop's computed highest sample — not a guessed parameter — with its boulders clearance-checked against the track.