This feature has been added to mgv5 and mgv7, and sets caverns to be enabled by default in new worlds.
An existing world will have the 'caverns' flag added to it's 'mgv5_spflags' or 'mgv7_spflags' on MT engine update, and caverns will be enabled in that world.
You may not mind caverns in newly generated areas of your world, but be aware that if a cavern intersects the border between old world and new, a flat wall will appear along a mapchunk border.
To avoid caverns being added to an existing world, add 'nocaverns' to the mapgen specific flags and add the line to your 'minetest.conf' file before using the new MT engine version.
For example:
Code: Select all
mgv5_spflags = nocaverns
Code: Select all
mgv7_spflags = mountains,ridges,nofloatlands,nocaverns