RACKLIGHT is a warehouse operating system that does not exist: a concept VITON13 built in September 2026 for an invented third-party-logistics site, Norvane DC-02. Warehouse software usually shows stock as tables of codes; we wanted to see what happens when the warehouse itself becomes the interface, with every pallet in view and every action visible on the floor.

The brief we set ourselves: a product a shift lead could plausibly use, not a 3D showpiece. That meant real workflows — find a pallet, walk an order, put away a delivery, act on stock problems — with the numbers behind every suggestion on screen, in English and Russian, on a laptop and on a phone.

The warehouse is a three.js scene with an orthographic, isometric camera: a 108 × 80 m building with 12 main aisles, 4 aisles in a glass cold room, receiving, packing, shipping and 10 dock doors. Its 1,656 bin locations are instanced pallets coloured by stock level, or by pick frequency in heat mode; nine pickers and five forklifts move along the aisle graph, and trucks reverse onto the docks on schedule. Everything is procedural: no models, no image textures, no external requests.

Search (⌘K) covers the 400 SKUs, orders and bin codes: the camera flies to the bin, a beam of light marks it and a path runs from the nearest picker. The pick-path optimiser compares the order sheet’s sequence with a route built by nearest neighbour and 2-opt on real aisle distances, then sends a picker to walk it. An inbound scan chooses a slot by velocity — fast movers nearest packing, chilled goods in the cold room — and a forklift carries the pallet there.

Inventory intelligence is demo AI, and says so: rules and statistics that run in the browser. Each SKU has 90 days of generated demand with weekly seasonality; a damped-trend forecast sets reorder points and flags low stock, overstock, dead stock and slotting swaps, and every action changes the 3D scene. Dashboard panels, an Inventory table, an Orders queue and a Docks schedule complete it; the shell is plain JavaScript, and the 3D scene loads after it.

The concept runs at tarasovvitalii.com/demos/racklight/ with four views, four tools and about 230 interface strings in each language. On 28 September 2026 we measured the production build: the first script is 10 KB gzipped, and the three.js scene, 154 KB gzipped, loads after the interface has painted; the whole build is 1.0 MB, with no image, model or texture files.

We ran the demo’s own routing code on the 1,140 orders it generates over 30 days: the optimised route was a median 32% shorter than walking the order sheet line by line (the order on screen goes from 409 m to 211 m). In headless Chrome on a MacBook Air with an Apple M5, at 1600 × 1000 on a Retina scale, the scene held 55–60 fps under the default 60 Hz frame clock in six states and rendered 160–200 fps with the cap removed.