Returns a 3D point that is the result of applying an Object Snap mode to a specified point
(osnap pt mode)
A point; otherwise nil, if the pick did not return an object (for example, if there is no geometry under the pick aperture, or if the geometry is not applicable to the selected object snap mode). The point returned by osnap depends on the current 3D view, the AutoCAD entity around pt, and the setting of the APERTURE system variable in the Command Reference.
Command: (setq pt1 (getpoint))
(11.8637 3.28269 0.0)
Command: (setq pt2 (osnap pt1 "_end,_int"))
(12.1424 3.42181 0.0)