Well, for one, i'd keep all my entities inside a type list. So when your doing your radar, simply loops through all the entity. Do a distance check on each one to see if they will be displayed on radar. If so, display a cube at it's position. Watch out though. You don't want too many things on radar, as it will add to your surface count. 'll knock together an example for ya.
3D radar HELP please
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