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Cluster with Unreal engine 4 (many computers to act like a single computer)

Has anyone done this or have any knowledge on how I can make it work with the unreal engine?

you might be better off asking this question in the VR section. On the simplest side of things you could have multiple viewports on a scene, each rendering on a separate machine. For example caves (http://en.wikipedia.org/wiki/Cave_automatic_virtual_environment), several use this approach with a single head node handling user input.