Is it possible to use meshes made in a 3d app as terrans. Or the same question in different words: can I somehow paint grass, trees, textures, etc. not on the Unity built-in teran, but on my own mesh?
You can in a way, as long as the “terrain” you have has a Collision barrier on the floor then most certainly. Hope this helped
You can’t use Unity terrain features on non-terrain meshes, but you can use this to convert a mesh to a terrain.