See below for screenshots

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world2minetest is a tool to generate Minetest worlds based on publicly available real-world geodata. It was inspired by tools such as geo-mapgen.

Currently, the following geodata sources are supported. Heightmaps and .dxf CAD files must use the EPSG:25832 coordinate system.

• Heightmaps in "XYZ ASCII" format
• OpenStreetMap, using the Overpass API
• .dxf CAD files (trees & bushes only)

Installation

1. Copy this repo's content to your computer, e.g. by cloning:

   git clone https://github.com/FlorianRaediker/world2minetest.git
   

2. Install the required Python modules:

   pip3 install -r requirements.txt
   

How to use

Generating a Minetest world consists of the following 4 steps. At least one of steps 1-3 is required.

1. Generate a heightmap.
2. Use OpenStreetMap data to add details.
3. Add decoration (trees, bushes) using .dxf data.
4. Create a map.dat file that can be read by world2minetest Mod for Minetest.

Generating a heightmap

A heightmap can be generated using the parse_heightmap_xyz.py script (see python3 parse_heightmap_xyz.py -h for details). First, download ASCII XYZ files and save them to the data_sources/ directory.

For Hanover (Germany), you can use this link.

Then, run parse_heightmap_xyz.py with any files you want to convert into a heightmap:

$ python3 parse_heightmap_xyz.py data_sources/path/to/file1.xyz data_sources/path/to/file2.xyz ...

This will create a new file parsed_data/heightmap.dat.

Use OpenStreetMap data

Select data using the Overpass API. Here is an example query:

[out:json][timeout:25][bbox:{{bbox}}];
(
   way;
   node;
);
out body;
>;
out skel qt;

Copy the JSON data from the "Data" tab into a new file data_sources/osm.json. Then, parse this data using parse_features_osm.py (see python3 parse_features_osm.py -h for details).

$ python3 parse_features_osm.py data_sources/osm.json

This will create a new file parsed_data/features_osm.json.

Add decoration from .dxf files

For geodata saved in .dxf files, parse_features_dxf.py can be used (see python3 parse_features_dxf.py -h for details). Currently, only trees and bushes are supported.

First, download .dxf files and save them to the data_sources/ directory.

For Hanover (Germany), you can use this link.

Then, run parse_features_dxf.py with any files you want to use. For each decoration, you will want to specify a query for ezdxf to get all entities representing that decoration. Currently, decorations tree, leaf_tree, conifer, and bush are available. Example command (for Hanover's data):

$ python3 parse_features_dxf.py data_sources/path/to/file1.dxf data_sources/path/to/file2.dxf ... \
    --query "*[layer=='Eingemessene Bäume' & name=='S220.40']" "tree" \
    --query "*[layer=='Nutzung_ Bewuchs_ Boden' & name=='S220.41']" "leaf_tree" \
    --query "*[layer=='Nutzung_ Bewuchs_ Boden' & name=='S220.43']" "conifer" \
    --query "*[layer=='Nutzung_ Bewuchs_ Boden' & name=='S220.46']" "bush"

This will create a new file parsed_data/features_dxf.json.

Detailed buildings with CityGML/CityJSON

CityJSON containing buildings can be used instead of buildings data from OpenStreetMap, for a higher level of detail.

If you have CityGML files, these need to be converted to CityJSON first. This can be done with citygml-tools:

$ ./citygml-tools to-cityjson --pretty-print data_sources/path/to/directory/with/citygml/files/

To obtain CityGML files for Hanover (Germany), you can use this link.

Run parse_cityjson.py with any files you want to use:

$ python3 parse_cityjson.py data_sources/path/to/file1.json data_sources/path/to/file2.json ...

This will create a new file parsed_data/buildings_cityjson.dat.

Putting it all together – creating map.dat

See python3 generate_map.py -h for details. Example usage:

$ python3 generate_map.py \
    --heightmap=parsed_data/heightmap.dat \
    --features=parsed_data/features_osm.json \
    --features=parsed_data/features_dxf.json \
    --buildings=parsed_data/buildings_cityjson.dat

This will save a file map.dat to the world2minetest folder, which contains the Mod for Minetest. Copy this folder to your Minetest installation's mods/ directory (or create a symlink for convenience).
To generate the map into a world, create a new world in Minetest and, before playing it for the first time, activate the world2minetest Mod.

Screenshots

License

world2minetest - Generate Minetest worlds based on real-world geodata
Copyright (C) 2021-2022 Florian Rädiker

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program. If not, see https://www.gnu.org/licenses/.