NERTEB is a Non Euclidian Ray Tracing Engine Beta - 2 Dimesional
This engine calcualtes rays only for corners of the shapes, assuming there are straight lines between them. This allows to create a visual effect that player sees only what charcter from the game is able to see. This, in turn, allows us to create optical illusions, putting player in a strange world.
Engine is fully based ont ggez rust grapgic library. See docummentation of this library