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As described above this is not possible and Lib3D neither would be able to draw a circle around you afai understood.
At least I do not know any way that Lib3d would be able to draw a circle without using a control. If there is any "circle" effect with a definable size i'm not aware of it.
If it's a control and would be able to draw it around you it needs to update that often (every few milliseconds) to keep the circle correct and move with you, that you'd have some performance issues...
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