I wanted to make something like this and was getting pretty deep into the weeds trying to add tessellation shaders to Godot and figuring out how to do transformations on the entire ASTER3 GDEM dataset with GDAL. Long story short, it’s a lot easier to sit on my ass and let someone else do it :)

I still have 500GB of digital elevation model tiles sitting on my hard drive just in case I change my mind though.