Procedural 3D building generator — not generative AI.

What “procedural” means here

A procedural generator encodes a set of construction rules. In Metropolygonia, user-facing controls become numerical inputs for those rules: footprint dimensions determine the massing, floor settings establish vertical structure, façade parameters place openings and architectural elements, and interior settings create rooms, partitions and slabs when they are required.

The optional seed introduces controlled variation inside those boundaries. It is not a hidden creative prompt. Keeping the seed and parameters makes a result reproducible, which is useful when a team needs to return to an approved option or generate a related family of buildings.

This also makes the limits understandable. The generator accelerates structured base geometry; it does not replace art direction, bespoke hero modelling, simulation, lighting or final material authoring in Unreal Engine, Blender or another DCC application.

From massing to a reusable building

1. Define the envelope

   Set width, depth, floor count and storey dimensions to establish a metric building volume. These values remain the source of truth as you iterate.

2. Choose architectural logic

   Select a form and style, then refine façades, windows, balconies, roof treatment, access and technical details. Parameters change the generated construction rather than deforming a finished mesh blindly.

3. Set the level of interior detail

   Generate rooms, editable partitions, floor slabs and circulation when interior access matters, or use an exterior shell for lighter context buildings.

4. Control variation

   Change the seed to explore alternatives inside the same brief. Save complete parameter presets so a promising option can be reproduced and refined later.

5. Place it in context

   Save buildings to a city project, position and rotate them, then shape roads, junctions and roundabouts around the assembled urban layout.

6. Export the deliverable

   Download an individual building as GLB, glTF, OBJ or STL, or package a city as separate building files, a road mesh and a manifest.

Controls that survive iteration

When to use it — and when not to

A strong fit

• Rapid massing and façade studies where dimensions must remain editable.
• Families of related buildings for previsualisation, games or urban context.
• Early Unreal Engine environments that need correctly scaled structured geometry before final art passes.
• Browser-based exploration when installing a full DCC tool would interrupt the first design pass.

Use a bespoke workflow instead

• A landmark or scanned asset that must reproduce a unique building exactly.
• A final cinematic model requiring sculpted detail, custom topology or a studio-specific optimisation pass.
• Engineering, permitting or construction documentation. Metropolygonia is a creative 3D design tool, not a BIM authoring or structural validation system.

Continue with the workflow