Is the Zip line 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), 187 KB: 1,952 triangles, 5,856 vertices and 26 materials, modelled in metres at 7.5 m × 3.4 m × 1.6 m.

Is Zip line animated?

Yes — the GLB carries a baked animation (8.0 s), ready to play with any glTF animation mixer.

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 Zip line 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.

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Zip line

A low-poly rooftop zip line: a braced steel launch tower with a timber deck, red railings and a ladder, a cable sagging across to a lower anchor post with an orange brake buffer, and a two-pulley trolley carrying a hanging seat. It plays a seamless 8-second loop: the seat rides down, bumps the brake and is hauled back.

Original GLB187 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: 1,952
Vertices: 5,856
Meshes · materials: 26 · 26
Size (W × H × D): 7.5 m × 3.4 m × 1.6 m
File: GLB · 187 KB
Animation: scene-motion · 8.0s
Style: Low-poly
Collection: Rooftop District

Palette · named materials

brick red: seat#c32222
brick red dark: deck railings#821717
sunset orange: gantry beam, grab bar, brake buffer#ed7e1d
mid grey: tower legs, gantry and anchor posts, pulleys, axles#7d828c
tar grey light: tower X-braces#a3a5a8
tar grey: ballast slab#757e8a
tar grey dark: deck frame, ladder, cable clamp, back stays, foot plates, trolley housing, spreader#525860
water-tower brown: deck planks#6b4a2e
dark wood: roof sleepers#3d2a1c
soot black: cable, lanyard and straps, pulley spokes#1b1b22

Use it

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

const gltf = await new GLTFLoader().loadAsync(
  "https://assets.stoicsoft.com/1designtool/3d/models/rooftop-district-zip-line/5c2e887aac/model.glb"
);
scene.add(gltf.scene); // metres, +Y up, front faces +Z

const mixer = new THREE.AnimationMixer(gltf.scene);
gltf.animations.forEach((clip) => mixer.clipAction(clip).play());
// in your loop: mixer.update(delta)

How it was made

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

Zip line for the Rooftop District 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. It moves: author a seamless baked loop (2–12 s) with every pivot exactly at its hinge, axle or swivel, and keep the base still. This is one part of the Rooftop District kit (Low-poly style, flat-lowpoly direction): Life above the streets. Use ONLY the kit palette, by name: brick red #c32222, tar grey #757e8a, sunset orange #ed7e1d, water-tower brown #6b4a2e, brick red dark #821717, tar grey dark #525860, brick red light #db5757, tar grey light #a3a5a8, 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 `skylineHeight` (0–1, default 0.5) for the kit's "Skyline height" 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 abstract-kinetic
three-check PASS · glb-lint PASS

Make your own with 1DesignTool →

Named parts · 10

Zip line
Ballast pads
Launch tower
Gantry beam
Anchor post and brake
Cable
Trolley
Front pulley
Back pulley
Hanging seat

Note: Size at default: about 7.55 m long (X) × 3.39 m tall × 1.6 m deep (Z). The 1.4 m square deck sits 2.0 m up, the cable leaves a clamp under the gantry beam at 3.14 m and spans 5.0 m to an anchor head at 2.34 m with 0.25 m of sag. Origin is the bottom centre, the timber sleepers rest on y = 0, the front faces +Z and the line runs down toward +X. The GLB has 1,952 triangles in 26 meshes and no textures; every material is named exactly after a kit palette colour (10 of the 12 used). The exporter writes one material per mesh, so a colour name repeats: recolour by name. The GLB carries one baked 8 s clip, 'scene-motion': the trolley rides down the cable (translation plus tilt with the cable slope), brakes on the orange buffer, bounces and is hauled back; each pulley spins about its own axle by the distance travelled; the seat swings about the trolley's swivel pin, lagging the acceleration and ringing down after the brake. Tower, gantry, anchor, cable and base never move. The clip starts mid-ride so the poster frame shows the seat on the line. The cable is static and does not deflect under the trolley; the seat is empty (no rider). Params are baked at their defaults and only change the model when the scene is rebuilt in the viewer: skylineHeight (the kit's 'Skyline height') raises the deck from 1.5 m to 2.5 m and the whole line with it; spanLength and cableSag reshape the line, and the anchor end never drops below 1.45 m so the seat clears the roof. glb-lint: 0 errors, 6 heuristic warnings (per-mesh duplicate materials, deliberate non-indexed flat-shaded geometry, intended overlaps of braces/legs and housing/axles, the cable and buffer flagged as not touching a sibling though they meet the clamp and anchor head, and a 3.39 m height vs the direction's 1 m reference). plan-check passes except its part-id regex, which rejects the hyphens in the slug-based ids this library requires; a de-hyphenated copy passes, and three-check confirms all 10 ids survive the GLB reload.

About the Zip line 3D model

Zip line is a free animated low-poly 3D model from the Rooftop District set. It measures 7.5 m × 3.4 m × 1.6 m (W × H × D) at real-world scale and is built from 1,952 triangles across 26 meshes, with 10 named parts and a baked animation (8.0 s). Download the 187 KB GLB and drop it into three.js, React Three Fiber, Godot or Blender — free for commercial use, no attribution required.

Is the Zip line 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), 187 KB: 1,952 triangles, 5,856 vertices and 26 materials, modelled in metres at 7.5 m × 3.4 m × 1.6 m.
Is Zip line animated?: Yes — the GLB carries a baked animation (8.0 s), ready to play with any glTF animation mixer.
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 Zip line 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.