How does worldgen work?

[Cotoffer200]

Hello, I'm making my own game but it seems that despite there being no code in my game theres a few map generators already defined?

Obviously they dont work since all the nodes they use arent defined but why are they even showing up? Shouldn't mapgens be defined per game (or mod)?

Since it appears these mapgens are defined from outside the games, where are they defined and how can i restrict them so only my own mapgens are used for my game?

Thanks in advance!

-Cotoffer200

[Mantar]

See the lua_api.md file that ships with Luanti, and look for the details on settings used in game.conf. You can configure available map generators and their available settings in there, like in Exile we have:

Code: Select all

disallowed_mapgens = v5, v6, v7, flat, fractal, singlenode
disallowed_mapgen_settings = mg_flags, mgvalleys_spflags

Basically all non-Lua mapgens are shipped as part of the engine, so they're always available to games, but you can hide the ones that are invalid for your game.

[Blockhead]

Hello, I'm making my own game but it seems that despite there being no code in my game theres a few map generators already defined?

Obviously they dont work since all the nodes they use arent defined but why are they even showing up? Shouldn't mapgens be defined per game (or mod)?

Those are defined in C++ inside of the engine. They are there because games stand to benefit from having to not build their own mapgens if they don't want to. With only a a few aliases, you can have a map generator familiar to any MTG player that runs quite quickly without going to great pains for optimisation like repetitivestrain a.k.a halon had to for Mineclonia's clone of Minecraft map generation.

Since it appears these mapgens are defined from outside the games, where are they defined and how can i restrict them so only my own mapgens are used for my game?

Thanks in advance!

-Cotoffer200

You can allow or disallow specific mapgens with a line in game.conf; you probably want to know all the other options that file has too.

[ArceusI]

Hello, I'm making my own game but it seems that despite there being no code in my game theres a few map generators already defined?

Obviously they dont work since all the nodes they use arent defined but why are they even showing up? Shouldn't mapgens be defined per game (or mod)?

Since it appears these mapgens are defined from outside the games, where are they defined and how can i restrict them so only my own mapgens are used for my game?

Thanks in advance!

-Cotoffer200

If you know Minecraft's worldgen, you can easily understand how Luanti does worldgen: It uses the Seed (A number) to procedurally generate various values for noise, biomes and structure locations, among other things according to the mods you installed. Then the generator checks the flags you selected and generates those accordingly depending on the Seed & installed mods. From there decorations like ore viens will be added and then the game chooses a point where you spawn, once that's completed it places you in the generated world and you can see what the game generated. Some Luanti games like MineClonia can override the worldgen and thus might generate differently from Luanti.