Thanks! It started out as (and mostly still is) a thing I could use to make terrain that I could use in other Game Maker things myself, so it tends to be pretty helpful to use the same thing to make the tool since the terrain data's already in the exact format that I need. Also this time around it was a side project that I didn't want to spend a lot of time on the technical details of, and had already made the renderer for the other stuff I was working on.