Mapgen4

 from Red Blob Games
Jul 2018, Apr 2023

Pick a starting seed, then paint mountains, valleys, and oceans on the map! It will simulate evaporation, wind, and rainfall to determine biomes and rivers.

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Play with the sliders to change the simulation and style. For example, try decreasing raininess slider to see how reducing rainfall will make rivers dry up, or try decreasing lg_min_flow to see more small streams.

Treat this as a tool. Everything you create with it is yours to do with as you please. Credit is appreciated but not required. Suggested tag: #mapgen4. (doesn’t work on all platforms).

Goals for this project:

Status of the project: Finished, source code available[1], but the project is mostly inactive. I made some code changes in Apr 2023, with slightly higher resolution maps, but the maps won’t exactly match previously generated maps. I have a series of blog posts[2] about how I made these maps:

Also see my project from 2010[14], where I started developing these techniques. There are lots of things that could be added on top of the underlying delaunay+voronoi structure, like towns, trees, biomes, seasons, nations, watersheds, etc. If you’re interested in adding these, take a look at the source code, and feel free to email me. One day I might work on a mapgen5 that explores some more ideas on top of this.

Email me , or tweet @redblobgames, or comment: