How to mark edges on flat plane after shade smooth/auto smooth? I'm creating a barrel for a game. I was able to mark the seems on the side as sharp (Since there is an angle associated with it) giving the illusion of planks without adding additional vertices. I was hoping to do something similar to the edges on the top to also give the illusion of planks. Mark sharp doesn't do anything, and I haven't found a way to show the edges without adding additional vertices.
There is no way around this geometry wise, however you might use a custom normal map via image texture. That is perfect for this type of situation, and is often used in game assets for that reason.