If we had the ability to assign a camera's real time output to an object's texture, we could use the camera mirror rig found below in real time:

https://forum.reallusion.com/303484/Making-a-Mirror-in-iClone-6

Muvizu, which itself is pretty limited, uses this sort of trick to good effect to get around its reflection limitations. 

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My system: i7 3770 Gtx1060 6GB