Hello, sorry for the bad English. I experiment from the "Template" map, I manage to create a "Terrain Painter", add grass with the "Ground Cover" tool and it works. My concern is that I tried to add the grass from the "ETK driver training" map, I filled in what is needed in the "main.materials" file, so I manage to get some grass (BNGGrass on my "Layer test") but the grasses are like duplicated upwards.