int generateGround();
void addMud();
void flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos);
+ void moveMud(u32 remove_index, u32 place_index,
+ u32 above_remove_index, v2s16 pos, v3s16 em);
void growGrass();
void placeTreesAndJungleGrass();
virtual void generateCaves(int max_stone_y);