The classes Brush and Terrain Brush define the rules to create the other brushes. The other brushes inherit these classes.
Terrain Brushes:
- Gaussian lift of the ground
- Painting the terrain from the height
- Perlin noise
- Paddy field creation
Instance Brushes:
- Grid instance for cultures
- Vegetation brush creating forest from the biome (here only height)
A demo video is available here: https://youtu.be/b29lKXx9yKI