Hello!
I am making a videogame in 3d space with pixel art and tiles. I use Unity as the game engine and Blender as the map geometry editor. There is a feature in Unity to reduce the drawcalls if models have same material. I’ve decided to use Blender for this purposes and i have a few problems. Manual assigning gives a background line of the tiles atlas. I think that wasn’t right because i have took some parts of background. But it was wrong (see the screenshots). So i have a question about this thing: How can i automatically give UVs size for tile map, and snap it by tile steps. My tile map is 2048 by 2048. Thanks 
Sorry for my English, it’s not my native language.