This New Mapmaker Addition allows you to use surface terrain in the underground and underground in the surface. It also allows you to paint and delete border terrain. Please read the readme before using it and post any errors you might get
Update 1.01.
Changed the underground terrain in the surface to the obejcts section along with the border tools. If you didn't have the underground terrain available in the surface please download again.
Update 1.02.
Ash clouds in the underground were not compatible with TS136.
Rating: 5
A must-have for the ambitious mapmaker! Truly gamechanging compared to laborious copy-pasting.
Additional Comments:
Thank you so much! Even in 2021 we are still talking about the importance of this work. I've made about 10 maps using it, which in turn are used by the MP community.