Is the Engine bay 3D model free for commercial use?

Yes. It is free under the 1DesignTool 3D library license: use it in personal and commercial work — games, apps, websites, renders, ads and client projects — and modify it as you like, with no credit required. What you can't do is re-sell or re-distribute the file on its own or inside a model pack.

What file format is it, and how big is it?

A single binary glTF 2.0 file (.glb), 361 KB: 4,644 triangles, 13,932 vertices and 42 materials, modelled in metres at 7.8 m × 7.0 m × 18 m.

Can I animate Engine bay?

It ships as a static mesh. Its 11 named parts are separate nodes, so you can move or animate each one in your engine.

Which engines and tools can open it?

Anything that reads glTF 2.0. three.js, React Three Fiber, Babylon.js, Godot 4 and Blender import the GLB directly; Unity and Unreal Engine load it through their glTF importers. The snippets above show the exact code for three.js, React Three Fiber, Godot and Blender.

How was the Engine bay 3D model made?

Claude Code (Claude Opus 5.5) generated it inside 1DesignTool's 3D template from a written brief, then the design kit's checks verified the geometry and the GLB before it was published. You can make your own the same way with 1DesignTool.

FREEcommercial use · no sign-up

Engine bay

A low-poly single-bay fire station engine bay: a brick hall with a stepped firehouse parapet, a raised white roll-up door and a brass alarm bell, with a red fire engine nosing out onto the concrete apron.

Original GLB361 KB Poster

Left rail: colours and the 3 knobs the agent wrote into this model — they rebuild the geometry and go into your download. Right rail: looks for the viewer. Drag to orbit, scroll to zoom.

Triangles: 4,644
Vertices: 13,932
Meshes · materials: 42 · 42
Size (W × H × D): 7.8 m × 7.0 m × 18 m
File: GLB · 361 KB
Animation: Static
Style: Low-poly
Collection: Fire Station

Palette · named materials

engine red: engine cab, body and skirts, helmets#c32222
engine red dark: engine compartment seams and wheel-arch flares#821717
engine red light: engine light bar and tail lights, door lamps#db5757
brick: hall walls and parapet#9e3d2e
brick dark: plinth, corner piers, parapet panels#63261d
brick light: band course, window lintels, parapet centre panel#c66253
brass: alarm bell, fire pole, pump caps, grab rails, hubs, door knobs#b28c34
white: roll-up door, engine livery band and cab roof, ladder rungs#f4f1ec
warm white: cornice, coping, door surround, window frames, skylight curbs, apron lines, hose#f2ede2
soot black: glass, tyres, chassis, bell bracket, turnout coats and boots#1b1b22
mid grey: floor, roof deck, apron, steps, bumper, grille, pump panel, ladder rails#7d828c
dark wood: side and back doors, hose rack, gear rack#3d2a1c

Use it

import { GLTFLoader } from "three/addons/loaders/GLTFLoader.js";

const gltf = await new GLTFLoader().loadAsync(
  "https://assets.stoicsoft.com/1designtool/3d/models/fire-station-engine-bay/3f8bc4390c/model.glb"
);
scene.add(gltf.scene); // metres, +Y up, front faces +Z

How it was made

The brief given to 1DesignTool's “3D object” template:

Engine bay for the Fire Station kit. Design it as one clear asset at believable real-world scale for that setting (state the size in metres in meta.notes), with its main parts modelled and named, readable at thumbnail size and from every orbit angle. This is one part of the Fire Station kit (Low-poly style, flat-lowpoly direction): Ready for the alarm. Use ONLY the kit palette, by name: engine red #c32222, brick #9e3d2e, brass #b28c34, white #f4f1ec, engine red dark #821717, brick dark #63261d, engine red light #db5757, brick light #c66253, soot black #1b1b22, warm white #f2ede2, mid grey #7d828c, dark wood #3d2a1c. Every material's `name` must be exactly the palette colour it uses — the GLB carries these names so the kit recolours as one; an unnamed material fails delivery. Kit knob: expose a param `engineLivery` (0–1, default 0.5) for the kit's "Engine livery" setting wherever it makes sense on this part, and keep that id.

Agent: Claude Code · Claude Opus 5.5 in 1DesignTool
Direction: Low-poly · family scenes
three-check PASS · glb-lint PASS

Make your own with 1DesignTool →

Named parts · 11

Engine bay
Bay hall
Stepped parapet
Windows and side door
Roll-up bay door
Alarm bell and lamps
Apron
Fire engine
Engine wheels
Roof ladder
Pole, hose rack and gear

Note: Size: overall 7.85 m wide (X) × 18.25 m deep (Z) × 6.95 m tall to the top of the stepped parapet. The brick hall is 7.0 m wide × 14.0 m deep with 5.4 m walls, the bay door opening is 4.3 m × 4.3 m, and the concrete apron runs 3.5 m in front of it. The fire engine is 9.4 m long, 2.5 m wide and 3.2 m tall to its light bar. The front faces +Z. The origin is at the bottom centre of the bounding box (the side-door step makes the hall sit 0.35 m left of x = 0), and the model rests on y = 0. The exported model has 4,644 triangles in 42 meshes (merged per part and colour). It is static, with no animation clip. All 12 kit colours are used, and every material is named exactly after its palette colour. The exporter writes one material per mesh, so the same colour name repeats: recolour by name. Params are baked into the GLB at their defaults and only change the model when the scene is rebuilt in the viewer. engineLivery (the kit's 'Engine livery') widens the engine's white side band from a 0.12 m pinstripe (0) to a 1.0 m upper-body band (1), and from 0.5 up it also turns the cab roof white. engineOut rolls the engine from fully inside the bay (0) to 2.7 m out onto the apron (1). doorOpen raises the roll-up door. While the engine stands in the doorway, the curtain never drops below the top of the engine, and a short hood always shows. So at the default engineOut, doorOpen below about 0.8 has no visible effect. Both extremes (livery 1, engine in, door closed; and livery 0, engine out, door open) pass three-check. The interior (pole, hose rack, gear) is visible only through the door. glb-lint: 0 errors and 5 heuristic warnings: material count and duplicates (per-mesh materials), non-indexed geometry (deliberate flat shading), sibling overlaps (deliberate trim nesting), and the 6.95 m height against a generic 1 m reference. Its verdict reads UNVERIFIED only because no requirements contract was supplied. plan-check passes except for its part-id regex, which rejects the hyphens in the slug-based ids this library requires. With the hyphens removed it passes. three-check accepts the real ids, and all 11 survive the GLB reload.

About the Engine bay 3D model

Engine bay is a free low-poly 3D model from the Fire Station set. It measures 7.8 m × 7.0 m × 18 m (W × H × D) at real-world scale and is built from 4,644 triangles across 42 meshes, with 11 named parts. Download the 361 KB GLB and drop it into three.js, React Three Fiber, Godot or Blender — free for commercial use, no attribution required.

Is the Engine bay 3D model free for commercial use?: Yes. It is free under the 1DesignTool 3D library license: use it in personal and commercial work — games, apps, websites, renders, ads and client projects — and modify it as you like, with no credit required. What you can't do is re-sell or re-distribute the file on its own or inside a model pack.
What file format is it, and how big is it?: A single binary glTF 2.0 file (.glb), 361 KB: 4,644 triangles, 13,932 vertices and 42 materials, modelled in metres at 7.8 m × 7.0 m × 18 m.
Can I animate Engine bay?: It ships as a static mesh. Its 11 named parts are separate nodes, so you can move or animate each one in your engine.
Which engines and tools can open it?: Anything that reads glTF 2.0. three.js, React Three Fiber, Babylon.js, Godot 4 and Blender import the GLB directly; Unity and Unreal Engine load it through their glTF importers. The snippets above show the exact code for three.js, React Three Fiber, Godot and Blender.
How was the Engine bay 3D model made?: Claude Code (Claude Opus 5.5) generated it inside 1DesignTool's 3D template from a written brief, then the design kit's checks verified the geometry and the GLB before it was published. You can make your own the same way with 1DesignTool.