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MapgenBasic::generateBiomes() is a c++ function in Minetest that transforms the current chunk from being made only of stone into being made out of all the nodes of the applicable biomes. So your mapgen writes only stone, water, and riverwater to the VoxelManip , then after you call generateBiomes(), the chunk is transformed into one made out of layers of dirt, sand, riverbed silt, desert stone, snow etc, as defined by the registered biomes.

On the multimap forum thread I suggested that if the MapgenBasic::generateBiomes() c++ function was exposed to lua, then most mods would become compatible with multimap, as all of multimap's generators could be creating landscapes with all the correct nodes and decorations. You could even use minetest.set_mapgen_setting("mg_biome_np_humidity", ..., true) etc. to change the biome noise seeds whenever the layer changes (I think).

Today in IRC I asked paramat about the idea of exposing generateBiomes() to lua, and his first impression of whether it was sensible was positive.

Did you have any plans or imaginings for what to do about biomes? Should I play with the idea/code?

MT 5 has been released. Test to see if the mod still works or if crashes happen/ updates are required.