While I was building in Roblox Studio I noticed these “Lines” in my building. I am not sure how to remove them. I thought it just might be a studio graphic thing. So I launched my game on Roblox, with 10 Graphics, and they were still there. I always use 0.2 or 0.1 for the move snap to grid. It only occurs between to parts.
The one solution that I have found is unioning the parts; but as I hear it, unions are pretty bad for performance and often corrupt.
Also I do not believe it is from the Textures on the Parts, this is because even with the textures deleted there are still “Lines” in between the parts.
Technically yes because its where 2 parts touch but it would be so hard and time-consuming to do it is not worth it, BUT you can union and negate to make that hallway and the line will not be there.