Terraria's wiki suggests preparing for a battle against the Torch God via building a "diamond"-shaped minecart track. At the time of this posting, it reads:
Making a diamond shape out of minecart rails around a 10x10 of torches allows for a cheap, effortless, and 0 damage victory. Just make sure to hammer the rails so the player can circle the torches making use of bumpers and rail intersections as necessary.
However, I cannot seem to get a minecart track to fold into anything close to a diamond shape. Somehow I was able to hammer the top-most intersection into a nice, clean curve but haven't been able to reproduce that elsewhere. My latest attempt is below. Note that the top angle is perfect, the bottom is acceptable but not perfect, and I have no idea if it's possible to cleanly connect the left and right corners.
Is it possible to create a diamond shape with smooth edges allowing a continuous ride in one direction without additional button presses? If so, how?