Is there any way to create terrain: flat, sloped or adjustable easily without using the rendinst?

[Joylo_sensei]

I made a map as ugly as I could, but when trying to generate the navmesh some things happened…

I had to use this part of the tunnel to be able to make land with grass

making a rough terrain with holes and odd joints

Here I would like to make a hill but I had to put these stone walls

I don’t know the terraform tool because the map is located higher than the tool limit

Besides it only makes circles

and I can’t use it either since there is high ground and tunnels right below it

and the navmesh…

Due to limited resources there are things that stand out

and so the ia only runs towards the walls

[Joylo_sensei]

I forgot to add that I think I saw in another post that someone was taking out an entire airfield as if it were a rendinst, I wish there was that option for a block of land or something like that.

[Bazsi37]

Nope

[Mopuit]

Use the bottom or top of the coleum rendist is a flat square