How do you set a default workspace texture

[moriartykain]

I'm making a new map and most of it is underwater, so I want the land texture to all be ocean bed.

 

But I can't seem to figure out how to do that!

 

I can paint it by hand, or use "i" to go cell by cell and swap the texture.

But I was just wondering if there was a way to set the default worldspace land texture before or during making the world map.

 

I normally only do internal maps, so am I missing something?

Edited June 8, 2017 by moriartykain