How to set the properties of a terrain to a mesh so that grass and trees can be added to it?

Question

Unity

There is an island, I want to add grass and trees to it. How to add a terrain property to it so that you can draw grass/trees on it like in the default terrain? Googled but couldn't find anything

Answer 1

Found such a solution. In the asset store, download any
level editor that allows you to draw objects on various objects.

Answer 2

You can calculate the height map for the surface, import it into the unit, and remove the top of the mesh. We adjust the mesh to the terrain created according to the height map (there is information about this on the Internet) and draw.