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In layout view of ArcMap it is easy to add a scale bar.
In ArcScene there is no layout view and no insert a scale bar tab.
How do I add a scale bar in ArcScene?
This is a manual method not a built in feature of ArcScene.
First open the "3d editor", "enable current z", than draw a line from "3d graphics", which the length you defined before.
Required, but never shown