Parametric architecture
Choose an architectural style and control dimensions, floors, openings, roofs, balconies and façade details.
Procedural 3D building and city generator in your browser
- Generate complete buildings and entire cities in minutes
- Create detailed exteriors and functional interiors
- Export textured 3D models with UVs and PBR materials
- Work directly in your browser — no installation required
- Export to: GLB, glTF, OBJ and STL
Open the generator
No credit card required
- Repeatable resultsRecreate and refine the same building or city at any time using deterministic seeds.
- Real-world dimensionsControl building size, floors, openings and materials using explicit metric values.
- Editable structureWork with named architectural parts instead of receiving one merged, uneditable mesh.
- Reusable city assetsSave generated buildings and reuse them across multiple city layouts and projects.
One procedural workflow, from a single façade to a walkable city
Start with an architectural system, refine visible rules and keep the result editable. Mature features and experimental tools are labelled separately.
Generated interiors
Create rooms, floor slabs, stairs and circulation, then refine interior partitions manually.
City layout editor
Save buildings, place them in city layouts and create roads, roundabouts, terrain, foundations and stairs.
Material and UV system
Apply managed PBR materials with consistent real-world UV scale and explicit material assignments.
Production-ready asset structure
Export named and organized building parts together with structured packages for complete city layouts.
Walkthrough and inspection
Explore buildings, interiors and city layouts at human scale using the built-in WASD mode.
From a building idea to a complete city
Watch the procedural workflow move from detailed architecture to a larger urban layout.
Two connected tools
Generate a building or assemble a city
BUILDING
Procedural building generator
Control footprint, width, depth, floors, storey height, façades, windows, doors, balconies, roofs, interiors, materials and repeatable variation.
Explore the procedural building generator
CITY
Procedural city generator
Reuse saved buildings, place them directly, draw straight or curved roads, create intersections and roundabouts, work with terrain, then save or export the city project.
Explore the procedural city generatorHow it works
A controlled path from dimensions to export
1. Define
Set the dimensions, architectural logic and level of detail.
2. Generate
Build deterministic geometry from the parameters and seed.
3. Refine
Adjust openings, roofs, interiors, materials, roads and terrain without changing stable project data.
4. Export
Choose an individual model format or prepare a structured city package.
Controls
Procedural rules remain visible and editable
The same inputs and seed reproduce the same result. Architectural styles are labels over stable internal values, so changing the interface language does not change geometry, project JSON or exported model data.
Procedural, not generative AI
Metropolygonia assembles geometry with deterministic code. It does not create buildings from a text prompt and does not hide the construction logic behind a generative model.
Interior layouts, selected PBR material maps, terrain sculpting and the destruction laboratory have different maturity levels. Experimental systems are labelled in the application and still require downstream validation.
Export workflow
Move structured assets into the next tool
Export individual buildings as GLB, glTF, OBJ or STL. City exports can keep buildings separate and include roads plus a machine-readable manifest, which is easier to inspect and update than one opaque scene file.
Metropolygonia provides geometry, scale, named parts, materials and UV context. Import settings, collisions, lighting, LODs, Nanite, navmeshes and final optimisation remain responsibilities of the target application.
Compare the verified export formatsReal results
Examples published directly from the current application
Every square capture below is created in the editor and published by the administrator with the “Add to examples” action.
Free Beta
Current access and limitations
Generation and editing are available without an account. Export requires a signed-in Free Beta account, which currently receives 50 starter exports and then two exports per monthly period.
Free Beta exports use the current Free Non-Commercial Asset License. Public non-commercial work requires the attribution stated in that licence. Commercial plans and commercial licensing are not currently available.
The generator is a creative 3D tool, not BIM, structural engineering, building-code validation or a replacement for final modelling and optimisation.
Read the current Free Beta allowanceQuestions before opening the generator
Is Metropolygonia an AI generator?
No. Geometry is generated procedurally from explicit controls, architectural rules and deterministic seeds.
Can the same building be reproduced later?
Yes. Keeping the same compatible project data, parameters and seed reproduces the same procedural state.
Which export formats are available?
Individual model exports include GLB, glTF, OBJ and STL. The city workflow also creates ZIP packages with separate assets and a manifest.
Can Metropolygonia generate interiors?
Yes. The building generator can create procedural rooms, partitions, slabs and circulation, or use an exterior-only shell for lighter context.
Can a complete city be exported?
The current city package can export manageable building assets, road geometry and a manifest. It is not a traffic simulation or a complete production-ready game level.
Does it replace Blender or Unreal Engine?
No. It prepares structured base assets. Final materials, art direction, import configuration, optimisation and project-specific systems remain downstream work.
What are the current beta limitations?
Some terrain and destruction tools are experimental. Complex outputs and all downstream imports should be reviewed before production use.
Can generated files be used commercially?
No. The current Free Beta licence permits only the non-commercial uses described in the Free Non-Commercial Asset License and requires “Created with Metropolygonia” in public non-commercial projects.