Seamless(ish) Doorway Transition

I see this being a life saver for big open world games that can't function with "20 doors per scene" rule. You could probably layer scenes in a triangular or rectangular grid and still have 16-17 doors left for caves, houses, etc.

This is very cool! Though I'm surprised vertical rotation can't be saved without a custom cam. Or is that it can't be initialized on the other side?