I made a small room in Blender (nothing fancy, just a hollowed out cube). I didn't want my player (first person) to fall through the ground when I spawned him there, so I put in a mesh collider on the room. The problem is that whenever my player (again, first person) walks up to a wall and then turns anywhere more than 45 degrees, the player can look through the wall. I had this problem before with non-imported cubes in Unity and fixed that by making the box collider larger, but I don't seem to have this option with a mesh collider.