hi friends:

 m y question is that i want to select a point of the scene as the rotation 
center of the trackball manipulator .   i know how to pick objects ,

but the scene is showing a point cloud ,   how to select the litttle point in 
the scene among the point cloud?   is there a method to pick 

the nearest point from the mouse point in the 3d scene?


your sincere Shawl.
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