Get global/world Vector-Axes

How do I get the global vectors corresponding to the world axes. My problem is that sometimes my camera is tilted in game so the up/right vectors would not point straight up/right, therefore I would like to use the world axes as vectors.
How can I do that?

World axes are always X=(1,0,0) Y=(0,1,0) Z=(0,0,1)

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I did not realize that. Thank you very much!