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Highlighting the Mouse selected point

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I need to highlight the mouse selected point  on the mesh. 


Now my application converts the 2D point into 3D  and redraws the  mesh. But the problem is, many times 3D point too small enough to get displayed. Then I draw another point  - x offset from the 3D  point. Though point is now visible, upon zooming the two points are visible. 


I have seen some software, displaying selected point as small circles or other gemotries. 


Any idea, how can we do this?

Edited by rajesh_nest

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