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Walkable demo

Prison cell block

Walk a 20 by 14 metre cell block built from the Prison Complex Builder pack: six barred cells with bunks, a mezzanine walkway and stair, a canteen with bolted tables, a kitchen and serving counter, the control desk and guard booth.

About

One block from 24 of the pack's 127 models, in the hall preset with concrete walls, cool light and light banks under a 7 m ceiling.

You come in through the block door past the intercom post and the restricted access sign. Six cells line the back wall, each with two bar wall panels and a barred door, concrete partitions, a bunk, a toilet-sink combo and a shelf; a mezzanine walkway with rails runs along the cell front, reached by the cell block stair. Four bolted canteen tables fill the middle, the kitchen run, serving counter and food trolley take the west side with the phone bank, and the control room desk, monitor bank and guard booth the east, with CCTV cameras watching from the walls.

This pack ships animation clips: the cell doors, the block door, the serving counter, the kitchen run and the food trolley play as you come within three metres and rewind when you leave.

Every piece here is a published model from the pack, placed by hand. Walk with the keys or touch, and approach a piece to see it move if it has animation. Colliders, navigation and gameplay are yours to add.

Points of interest

Use with an AI agent

Copy this prompt into your AI chat to rebuild the layout, then describe what to change.

Rebuild the "Prison cell block" demo scene from the Prison Complex Builder pack in my project.

Layout (JSON, every placement with its CDN URL): https://3dassets.dev/api/v1/demos/prison-complex-builder
Pack manifest: https://3dassets.dev/api/v1/packs/prison-complex-builder
Demo page: https://3dassets.dev/demos/prison-complex-builder

- 100 placements of 24 models; units are metres, +Y up, rotation is yaw in degrees about +Y
- Spawn at (2.5, 0, 5.3) facing 190 degrees; eye height 1.6 m
- Licence: CC0 1.0 Universal (no attribution required)
- Loading: three.js GLTFLoader, one load per distinct model, cloned per placement; no decoders required

Also available as JSON or Markdown, and via the MCP server.

Common questions

How do I use Prison cell block with my AI development tools?
Press "Copy for AI agent" above and paste the prompt into Claude Code, Cursor, Codex, GitHub Copilot, ChatGPT or any other coding assistant. The prompt carries the direct CDN URL, the real-world size, the licence and the loading notes, so the assistant can fetch the scene and place it in your project without you writing the loader yourself. For a permanent connection, add the 3DAssets.dev MCP server to your tool with one command (for Claude Code: claude mcp add --transport http 3dassets https://3dassets.dev/mcp) and the assistant can then search the whole catalogue, fetch files and read the usage snippets on its own.

MCP server setupGuide for AI agents

How do I get started?
Walk the scene here with the keys or touch to see how the pack fits together. To build it yourself, download the pack with the button, then copy the "Copy for AI agent" prompt: it links the layout JSON, which lists every placement with its position, rotation and CDN URL, so an assistant connected to the MCP server can rebuild the scene in your engine and change it to order.

MCP server setup

Which game engines and tools can I use Prison cell block with?
Anything that reads glTF, which today means all of the major ones: three.js and React Three Fiber on the web, Godot 4, Unity, Unreal Engine 5, Blender and the model-viewer web component. Every model in the scene is a self-contained binary glTF (.glb) with textures embedded, so each is one file to import and no plugin, converter or decoder to install first.
How do I import this scene into Unity, Godot, Unreal or Blender?
Unity: install the glTFast package (com.unity.cloud.gltfast) from the Package Manager, drop the .glb into Assets and drag the prefab in, or load it at runtime from the CDN URL. Godot 4: copy the file into the project folder and the editor imports it as a scene you can instantiate. Unreal Engine 5: File > Import with the built-in glTF importer, which converts the axes for you. Blender: File > Import > glTF 2.0. Units are metres with +Y up in the file, and every importer above handles the conversion to its own axes automatically.
Can I use Prison cell block in a commercial game, and do I need to credit anyone?
Yes to commercial use and no to credit. Every scene on 3DAssets.dev is released under CC0 1.0 Universal, which places it in the public domain: use it in a paid game, an app, a film or a client project, modify it, redistribute it, and put nothing in the credits. A link back is welcome but it is entirely your choice.

CC0 licence text

Can I load it from the CDN instead of downloading it?
Yes. The pack behind it has a permanent URL on cdn.3dassets.dev that is CORS-enabled and never changes content, so you can pass it straight to GLTFLoader, glTFast or model-viewer in production and cache it as hard as you like. Downloading is only needed for engines that import from disk.
Is the demo itself a file I can download?
No, and it does not need to be. A demo is a layout of the pack's published models composed in your browser from the CDN, so there is no extra file to fetch. Download the pack for the models, and take the layout JSON linked above for the placements: together they are the whole scene, and an AI agent can rebuild it from those two links.
Can I change the scene, or add gameplay to it?
Yes. The layout is plain data in metres, so move, add or remove placements freely in your own engine. Colliders, navigation and gameplay are yours to add: the demo shows what the pack looks like assembled, and your game decides how it plays.

Models in this demo

cell wall with bars (Prison Complex Builder)

cell wall with bars (Prison Complex Builder)

Three-metre barred cell wall with round steel uprights and bolted horizontal rails.

@3dassets2.2k tris · 9 ↓
cell door barred (Prison Complex Builder)Animated

cell door barred (Prison Complex Builder)

barred cell-access door in a 1 m frame, 2.2 m high; named hinge node, lock box, handle and jamb fasteners.

@3dassets4.1k tris · 10 ↓
cell bunk (Prison Complex Builder)

cell bunk (Prison Complex Builder)

Bolted two-tier steel bunk with two vinyl mattresses, raised side guards and five ladder rungs.

@3dassets7.2k tris · 6 ↓
toilet sink combo (Prison Complex Builder)

toilet sink combo (Prison Complex Builder)

Compact stainless toilet and basin combination with a hollow bowl, seat ring, tap and integrated cistern.

@3dassets1.8k tris · 6 ↓
cell shelf (Prison Complex Builder)

cell shelf (Prison Complex Builder)

Wall-mounted shelf with two diagonal brackets, back fasteners and a rounded front lip; grounded for placement.

@3dassets1.2k tris · 8 ↓
concrete wall straight (Prison Complex Builder)

concrete wall straight (Prison Complex Builder)

One-metre-grid institutional block wall, 3 m tall, with mortar joints and sealed skirting.

@3dassets1.3k tris · 11 ↓
mezzanine walkway (Prison Complex Builder)

mezzanine walkway (Prison Complex Builder)

Steel catwalk deck with anti-slip surface and structural edge beams; 2 m long, 1 m wide.

@3dassets1.1k tris · 8 ↓
walkway rail (Prison Complex Builder)

walkway rail (Prison Complex Builder)

Bolted 2 m catwalk guard rail with top rail, mid rail, vertical infill and toe rail.

@3dassets1.0k tris · 11 ↓
cell block stair (Prison Complex Builder)

cell block stair (Prison Complex Builder)

Fifteen steel stair treads, two stringers and handrails connect ground to the 3 m mezzanine level.

@3dassets5.6k tris · 8 ↓
canteen table bolted (Prison Complex Builder)

canteen table bolted (Prison Complex Builder)

Institutional six-seat canteen table with two attached benches, rounded edges and floor-bolted steel supports.

@3dassets4.7k tris · 11 ↓
kitchen run (Prison Complex Builder)Animated

kitchen run (Prison Complex Builder)

Compact kitchen run with four burner rings, control knobs, a recessed sink, tap and three cabinet fronts.

@3dassets6.6k tris · 5 ↓
serving counter (Prison Complex Builder)Animated

serving counter (Prison Complex Builder)

Three-pan serving counter with stainless cabinets, three covered food pans and a supported glass sneeze guard.

@3dassets6.6k tris · 8 ↓
food trolley (Prison Complex Builder)Animated

food trolley (Prison Complex Builder)

Three-tier stainless meal trolley with caster wheels, three divided trays and a raised push bar.

@3dassets11.1k tris · 9 ↓
phone bank (Prison Complex Builder)

phone bank (Prison Complex Builder)

Three wall telephones with separate handsets, raised keypads, backing panels and supported cords.

@3dassets4.0k tris · 8 ↓
control room desk (Prison Complex Builder)

control room desk (Prison Complex Builder)

Three-screen control desk with keyboards, cable-ready rear edge and an operator chair.

@3dassets8.9k tris · 10 ↓
monitor bank (Prison Complex Builder)

monitor bank (Prison Complex Builder)

Freestanding six-screen surveillance monitor array on a two-post steel frame.

@3dassets4.6k tris · 6 ↓
guard booth (Prison Complex Builder)

guard booth (Prison Complex Builder)

Single-person guard booth with side glazing, an open front, check-in ledge and canopy.

@3dassets4.8k tris · 10 ↓
gym weight rack (Prison Complex Builder)

gym weight rack (Prison Complex Builder)

Three-tier barbell storage rack with round weight discs, bar supports and a protective floor mat.

@3dassets2.8k tris · 9 ↓
weight bench (Prison Complex Builder)

weight bench (Prison Complex Builder)

Padded bench-press station with floor-mounted uprights and a separate loaded barbell silhouette.

@3dassets3.4k tris · 10 ↓
block door with control (Prison Complex Builder)Animated

block door with control (Prison Complex Builder)

control cell-access door in a 1 m frame, 2.2 m high; named hinge node, lock box, handle and jamb fasteners.

@3dassets6.6k tris · 9 ↓
intercom post (Prison Complex Builder)

intercom post (Prison Complex Builder)

Pedestrian intercom post with call button, louvred speaker, bolt-on faceplate and concrete footing.

@3dassets3.2k tris · 6 ↓
restricted access sign (Prison Complex Builder)

restricted access sign (Prison Complex Builder)

Freestanding restricted-access sign with high-contrast graphic bars and two anchored posts; no branded text.

@3dassets1.3k tris · 7 ↓
cctv camera (Prison Complex Builder)

cctv camera (Prison Complex Builder)

Wall-mount CCTV camera with angled bracket, weather hood, lens barrel and mounting bolts; grounded for placement.

@3dassets1.4k tris · 11 ↓
ceiling light bank (Prison Complex Builder)

ceiling light bank (Prison Complex Builder)

Twin protected fluorescent-style light tubes, steel reflector housing and hanging brackets; grounded for placement.

@3dassets900 tris · 7 ↓