Creating radar image
From Valve Developer Community
Counter-Strike: Source uses the overview for the radar image, so to create a radar image you just need to create an overview.
The tutorial for this is located here: http://www.fpsbanana.com/tuts/1948
To do: Bring the tutorial to the VDC (the tutorial does not seem to have an identified author...) and synchronize information with Level Overviews and perhaps VGUI2: Overview Display.
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