BCG Building Generator — User Guide
Version 2.5.0 · Unity 6 · Built-in Render Pipeline, URP and HDRP
Everything in this picture — buildings, roads, sidewalks, crosswalks, markings — was generated by the tool from a single button press.
What this tool does
Building Generator fills your city with background buildings. You point it at an area, press one button, and it produces low-cost buildings you can drive past, fly over, or walk between — each one a single mesh with a single material, so a hundred of them cost a hundred draw calls before batching even starts.
It is built for the buildings you don't walk into: the skyline behind a racing track, the blocks either side of an open-world road, the filler that makes a city read as a city. It is not an interior/architecture tool — there are no doors that open and no rooms you can enter (though the windows do show fake interiors, which is a rendering trick, not real geometry).
Everything is generated in the Editor and saved as normal Unity meshes and prefabs, so your finished city is ordinary scene content that ships with your game. Nothing needs the tool at runtime.
Start here
Never used it before? Read these three in order — about 15 minutes total:
- Getting Started — install it, open the demo, make your first building.
- How It Works — the handful of ideas the whole tool is built on.
- Building a City — the one-button city, then how to shape it.
In a hurry? Open Tools ▸ BoneCracker Games ▸ Building Generator ▸ Building Generator, go to
1 Plan ▸ City Grid, and press Generate City. That is the whole tool in one action; the rest
of this guide is about controlling the result.
I want to…
| I want to… | Go to |
|---|---|
| Make one building and place it | Creating a Single Building |
| Make lots of buildings at once | Creating Many Buildings |
| Line a street with buildings | Creating Many Buildings ▸ Street rows |
| Generate a whole city in one click | Cities and Districts |
| Control what a neighbourhood looks like | Cities and Districts ▸ Districts |
| Follow a curved road or racing line | Paths and Roads |
| Add drivable roads with kerbs and crossings | Paths and Roads ▸ Roads |
| Change how the buildings look | Customising Buildings |
| Turn a blockout into real buildings | Customising Buildings ▸ Greybox replace |
| Fix pink / magenta buildings | Materials and Lighting ▸ Fix Materials |
| Make the windows glow at night | Materials and Lighting ▸ Night Lights |
| Bake lighting on my city | Materials and Lighting ▸ Baked lighting |
| Make it run faster | Optimising |
| Ship it / clean up before release | Finishing and Shipping |
| Fix something that went wrong | Troubleshooting and FAQ |
| Look up a setting, default or API | Reference |
All documents
| # | Document | What it covers |
|---|---|---|
| — | User Guide (this page) | Start here — what the tool does and where to find things. |
| 01 | Getting Started | Installing, the playable demo, opening the window, your first building. |
| 02 | How It Works | Recipes and seeds, the four-stage pipeline, what gets written to disk. |
| 03 | Creating a Single Building | The Single pane, previewing, painting buildings into the scene. |
| 04 | Creating Many Buildings | Variation rows, street rows, filling districts, mesh variety. |
| 05 | Cities and Districts | The one-button city, blocks and avenues, zones, district presets. |
| 06 | Paths and Roads | Street paths, generated road geometry, Road Constructor support. |
| 07 | Customising Buildings | Archetypes, palettes, detail levels, props, signage, greybox replace. |
| 08 | Materials and Lighting | Render pipelines, Fix Materials, night lights, fake interiors, probes, lightmaps. |
| 09 | Optimising | LODs, mesh reuse, combining the city, mobile and build-size guidance. |
| 10 | Finishing and Shipping | The health dashboard, the pre-ship checklist, cleaning up unused assets. |
| 11 | Troubleshooting and FAQ | Common problems and the questions people ask most. |
| 12 | Reference | Every setting and default, the seed contract, the runtime API, package contents. |
Two further documents ship alongside these:
- Atlas Layout — how the facade textures are laid out, for anyone repainting or extending them.
- Changelog — what changed in every release.
Support
- Product page: bonecrackergames.com/urban-building-generator
- Contact: bonecrackergames.com/contact
- In the Editor:
Tools ▸ BoneCracker Games ▸ Building Generator ▸ Welcome Window
This documentation describes version 2.5.0. The version is shown in the generator window's title row, so you can always confirm which one you have.