Unity-City-Generator

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Unity-City-Generator

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Procedural 3d City generator in Unity using real life geometrical data from open street maps

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# CityGenPrototype

This project uses Unity3D to generate real world locations using OpenStreetMap data.

Import OpenStreetMap file. Go to https://www.openstreetmap.org/export. Manually select a section and export it. Convert the OSM-File to a .TXT file and import it into your Unity3D Resources folder.

Prepare the scene in Unity Create a surface for the scene to be placed upon. Place the surface below the origin (in negativ y direction) as all the objects are raycast down to the first object they hit. Save the scene.

Load the OSM data Go to Window -> Import OpenMap Data -> Customize the materials and settings and click on Import Map File. The world will be generated. Depending on the size of the data it might take a few moments to load.

All objects in the scene are listed as GameObjects in the project hierarchy in the editor. If available the GameObjects will be named after the given name in the OSM file. Otherwise it says "noData". The generated scene has to be saved in a SEPARATE scene in order to be loaded up again.

Heightmap To import a heightmap create a Terrain object in your scene. Select a greyscale heightmap image in your Assets folder (click on it) and then click on the menu item Terrain -> Heightmap From Texture. The terrain will deform according to your heightmap image.

Known issues Loading the scene throws an error "Instantiating mesh due to calling MeshFilter.mesh during edit mode. This will leak meshes. Please use MeshFilter.sharedMesh instead." This error can be ignore for now. Unity wants us to use a shared Mesh for all objects in the scene which would lead to a single GameObject for the entire generated result. Making it impossible to edit the meshes individually.

Due to possible inconsistent data in the OSM file some regions may not load throwing a "FormatException: Unknown char" or similar error message. This happens because of faulty attributes in the OSM file. It is an ongoing process to improve the code to handle all possible errors.

If you use an actual heightmap the generated scene is not properly placed on top of it. Implementing it in a way that i.e. the roads follow the course of the terrain properly is a huge task to tackle.

Unity-City-Generator

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