mapgen_rivers
=============

Procedural map generator for Minetest 5.x. Still experimental and basic.

Contains two distinct programs: Python scripts for pre-processing, and Lua scripts to generate the map on Minetest.

![Screenshot](https://user-images.githubusercontent.com/6905002/79073532-7a567f00-7ce7-11ea-9791-8fb453f5175d.png)

# Installation
This mod should be placed in the `/mods` directory like any other Minetest mod.

The Python part relies on external libraries that you need to install:
- `numpy`, a widely used library for numerical calculations
- `noise`, doing Perlin/Simplex noises
- optionally, `matplotlib` (for map preview)

They are commonly found on `pip` or `conda` Python distributions.

# Usage
## Pre-processing
Run the script `terrain_rivers.py` via command line. You can optionally append the map size (by default 400). Example for a 1000x1000 map:
```
./terrain_rivers.py 1000
```
For a default 400x400 map, it should take between 1 and 2 minutes. It will generate 5 files directly in the mod folder, containing the map data (1.4 MB for the default size).

## Map generation
Just create a Minetest world with `singlenode` mapgen, enable this mod and start the world. The data files are immediately copied in the world folder so you can re-generate them afterwards, it won't affect the old worlds.