Low Poly Prison - Cell Block Kit

A low-poly prison to build cell blocks, control rooms and exercise yards from, and its machines work. 136 props in a muted, stylized look, their textures made in code: block walls and cell fronts of bars, doorways and barred windows, the perimeter wall, sliding cell doors and barred gates, a security door with its card reader and keypad, the wing's supply and the cells' locking box, a control desk and its monitors, a metal detector and an X-ray scanner, alarms and cameras, fences, razor wire, a watchtower and its searchlight, bunks and steel toilets, the canteen, the laundry, the showers and the officers' post, lights, signs and a cell's clutter, and 33 machines whose parts move when they're used. One script runs them in Godot and in Unity. In GLB, FBX and OBJ, with a Godot addon, a Unity package and a prison to break out of.

Try it first: click Run asset pack above and break out in your browser: take the wing key from the officers' desk, open the control room and switch on the supply, unlock the cells, set the gates at the control desk, swipe through the security door and key the yard gate open. WASD and the mouse, E uses things, F for a torch.

Goes with Low Poly Industrial Facility, Low Poly Bunker, Low Poly Sewers and Low Poly Subway: the same 2 m grid, 4 m storeys, look and textures, so the prison's doors open onto the works, the bunker, the sewer or the station.

What's inside

• The building (41): a wing's block over a slate dado, plain, dirty and scratched with tally marks; a cell's off-white block, inside and out, white shower tile and the perimeter's precast wall with its anti-climb roll; half and low walls, posts and a column; cell fronts of bars, plain and round a door; wing, wide and cell doorways, a cell's barred window, a wing's high window, the control room's armoured window with its pass tray and the visiting room's; polished concrete, worn, epoxy, canteen, shower, cell and yard floors, a drain, a court's line, an upper floor and a landing's grating; ceilings plain, damp, beamed and with a barred skylight; a landing's railing, the net slung across a well, and stairs.
• Cells (10): the sliding cell door for a front of bars, a solid cell door with its observation flap and food hatch, and the wing key that opens it; bunks, a single bed, a steel toilet and basin, a desk and stool, a shelf, a steel mirror and an overflow mattress.
• Security (17): the wing's supply, the cells' locking box, a control desk with four gate switches and a monitor bank; a keycard and its reader, a door keypad, a security door, a sliding barred gate and a swing gate; a walk-through metal detector and an X-ray scanner with its belt; an alarm switch and its beacon, a camera, a cell intercom and a visiting phone.
• The yard (13): chain-link and razor wire fences, a razor coil, a sliding yard gate, a vehicle barrier, a watchtower with its ladder, a searchlight, a floodlight pole, a basketball hoop, pull-up and dip bars, a weight bench and plates, and a table with its benches.
• The rooms (18): the canteen's tables with their fixed stools, the servery, trays and a cup; an industrial washer, a laundry cart, shelving and a bag; a shower, a partition and a changing bench; a visiting booth; the officers' desk and chair, a staff locker, a key cabinet and a caged clock.
• Lights, signs and boards (22): caged, sealed, pendant and wall flood lights and an exit light; wing, visits, yard, servery, control and staff signs, a name board, keep clear, search and contraband notices and a landing sign; the wing's rules, a notice board, a height chart, a first aid box and a speaker. A made-up prison's, with no real prison service's marks, flags or insignia on any of them.
• Clutter (15): books, cards, letters and a photograph, toiletries and a toilet roll, a folded uniform, a small television, a kettle, a bin, a mop bucket, handcuffs, a baton and a radio.
• 33 working machines, 39 animations: the cell doors slide back behind their bars, the gates run aside or swing, the security door and the yard gate open, the barrier lifts, the card swipes down its reader, the keypad's and the control desk's keys press and lock, the supply's handle turns and the locking box's lever throws, the alarm's beacon turns, the cameras pan, the searchlight sweeps, the X-ray's belt runs, the washer's drum spins, lockers and cabinets open, the clock's second hand goes round and the lights and monitors light with the power. The moving parts are separate objects, so your code can drive them too.
• A demo prison to walk and break out of: a wing of cells behind their bars, its canteen and control room, the search at its gate, and the exercise yard inside the perimeter, its watchtower and the road out.
• Seamless textures (block, tile, concrete, epoxy, vinyl, mosaic, the yard and the ceilings; 128 px a metre) as their own PNGs, for your own geometry, and an icon per prop.
• One 2048x2048 texture atlas for the whole pack, filtered with mipmaps, the occlusion baked into the vertex colours, real-world scale.

One script, every machine

Each prop that works carries the same script, set up for it: a switch, a button, a slot that takes an item, a keypad, a panel of switches, an item to pick up, or a machine that's powered. A machine is powered while everything it needs is live, so the cell doors need the locking box, the locking box needs the wing's supply and the security door needs the card reader. It says no when it's unpowered, wants an item or a code, and its signals tell your game what happened.

Built on a grid

Everything snaps to a 2 m grid with 4 m storeys: a wall is 2 m long and 0.25 m thick, a floor covers a 2 x 2 m cell, and a front of bars stands on a cell's edge as a wall does. A cell is two grid cells deep and one wide. Low Poly Industrial Facility's, Low Poly Bunker's, Low Poly Sewers' and Low Poly Subway's pieces snap to the same points.

Godot 4.3 to 4.7

An addon with a scene per prop: box colliders on every part (a door's move with it), an AnimationPlayer where it moves, machine.gd on every prop that works, one lit material, and a gallery with the prison to walk and break out of. Tested on Godot 4.3 and 4.7, on Forward+, Mobile and Compatibility.

# locks, cell_door: the props in your level
cell_door.needs = [cell_door.get_path_to(locks)]
locks.switched.connect(func(on): print("cells unlocked ", on))
locks.use()

Unity 6.3

A .unitypackage with a prefab per prop (colliders and animation clips), Machine.cs on every prop that works, the same machines with UnityEvents, the pack's lit shader for Built-in and URP (baked occlusion, soft light, shadows, fog and a glow map for lamps, screens and signs), a demo scene and the prison to walk and break out of.

// locks, cellDoor: the props in your level; carried: the items the player holds
cellDoor.needs = new[] { locks };
locks.onSwitched.AddListener(on => Debug.Log("cells unlocked " + on));
locks.Use(carried);

Other engines

GLB, FBX (animations as takes) and OBJ, one file per prop, with the atlas, and the whole pack in one .blend with the prison as its own scene. The machines' scripts are Godot's and Unity's; elsewhere the animations are there to play.

Free sample

Low Poly Prison Free has 16 of these props, free under CC BY.

License

Use in unlimited commercial and non-commercial games, apps and videos. No attribution required. Don't resell or redistribute the models, textures or scripts themselves.

Made with AI assistance (code, text, models and textures, all generated by code), checked by eye and tested in Godot 4.3 and 4.7 and Unity 6.3.

Stylized Complete - 20 Low Poly 3D Kits and Packs: all 20 for $39.99 ($224.80 bought apart)

More packs

• Low Poly Bunker - Cold War Bunker Kit
• Low Poly Bunker Building Kit - Modular Walls and Tunnels
• Low Poly Bunker Machines - Working Doors and Consoles
• Low Poly Industrial Building Kit - Modular Factory Walls
• Low Poly Industrial Facility - Modular Factory Kit
• Low Poly Industrial Machines - Working Doors and Controls
• Low Poly Pipes and Ducts - Industrial Pipework Kit
• Low Poly Prison Building Kit - Modular Cell Blocks and Yard
• Low Poly Prison Machines - Working Cell Doors, Gates and Security
• Low Poly Prison Props - Cell Furniture, Signs and Clutter
• Low Poly Sewers - Victorian Sewer Kit
• Low Poly Sewers Building Kit - Modular Tunnels and Channels
• Low Poly Sewers Machines - Working Sluice and Pumping Station
• Low Poly Sewers Props - Pipes, Signs and Debris
• Low Poly Subway - Metro Station Kit
• Low Poly Subway Building Kit - Modular Metro Station and Tunnels
• Low Poly Subway Machines - Working Fare Gates, Escalators and Train
• Low Poly Subway Props - Signs, Posters and Station Clutter
• Low Poly Warehouse Props - Forklift and Racking