Terrian Painter Help

I want to paint grass but it isn't 3d like there:

How can i do this!

 

I can't see the image well on my mobile. But I think you're referring to the groundcover. That's the 3d grass, or other objects on a terrain. You need to add this separately, but if you Google groundcover and BeamNG there is probably enough info to help.

 

If you copied a map as base you probably deleted the vegetation folder. Copy it back the from the original map.