How to make a mirror in the editor??

[palistov]

Even if you could see the player (most games neglect to have player models visible in first person beyond their arms), mirrors are very impractical in games. The cost of redrawing or computing what part of a scene is visible in a mirror would make frametimes so high they would get arrested for drug abuse. To emulate one you'd have to carefully build the environment around the "mirror" and get a custom-made player model. Probably way more work than it's worth.