Descripción
Keystone Lite — Free Modular Building Generator
Just draw the floorplan - we generate the building.
Keystone Lite builds game-ready 3D buildings — walls, floors, roofs, approximate interiors — right in the Unreal Editor. Pick one of three starter presets or draw a footprint on a true-to-scale 2D canvas, then bake to Nanite static meshes with collision that you own outright. No subscription, no credits, no AI required.
What you get, free
Presets — House, L-Shape, and Gable Cottage, one click each.
Sketch — draw the footprint on a true-to-scale 2D canvas (snapping, ortho, real Unreal units); place doors, windows, and interior walls.
Parametric editing — tune the building's parameters and inspect the building file.
Bake to Nanite static meshes with collision — drop the result straight into your level; you own the mesh.
The same deterministic, test-covered geometry core that powers the full Keystone — just a focused free slice of it.
Upgrade to Keystone — Building Generator for:
Draft from Text and Draft from Image (bring-your-own-key AI, or local Ollama) — describe a building, or turn a floor-plan image into one.
All eight presets (+ Castle, Setback Tower, Log Cabin, Round Tower) and multi-volume composition (castles, towers, wings).
Kit Mode — tile your own modular meshes onto walls and floors.
The full detailing toolkit — log-cabin / timber styles, detail bands, crenellations, arcs / round towers, stylize.
Import / export building files (JSON).
Who it's for: indie devs, students, and hobbyists who want to go from an idea to a game-ready building in minutes — for free — and upgrade when they need AI input, castles & towers, or their own mesh kits.
A note on interiors: Keystone drafts approximate interiors (floors, ceilings, interior walls, openings) — ideal for blockout, exteriors, and mid-ground buildings.
Requirements & dependencies
Engine versions: UE 5.3, 5.4, 5.5, 5.6, 5.7, 5.8 — a separate build per version. Platform: Windows (Win64) editor tool; baked StaticMeshes work on any target platform. Engine plugins (auto-enabled): Geometry Scripting and Modeling Tools. No third-party or user-made plugin dependencies. Keystone Lite ships without any AI features.
AI disclosure: Keystone Lite's geometry is generated by a deterministic procedural engine — not by generative AI. Keystone Lite includes no AI features at all (the optional AI text/image drafting lives only in the full Keystone, and is bring-your-own-key). No AI-generated meshes or assets are included. Some of the plugin's source code and this listing's marketing materials were produced with AI assistance.