I want photons to only travel one way through glass. How can I achieve this?
Place two 5px tall, 2px thick pieces of glass parallel to each other with a 1px gap. Photons only go through the right.
Here's one made of FILT, idk how to make glass one.
Qweryntino's one has the advantage of working perfectly and deterministically in all directions.
(Also I understand how it works, which can't be said of the glass one :P Not a disadvantage but definitely a thing.)