If you use AutoCAD to work in 3D this system variable is for you!! OSNAPZ simply substitutes the Z-value of the specified point with elevation (ELEV) set for the current UCS. In short, it allows you to actually use your OSNAPS in 3D. This was the one reason why I disliked 3D so much in AutoCAD. I could never get 3d solids to project onto a plane with another solid. I would have to "eye ball" some minor areas. Seems to work best with the PERPENDICULAR OSNAP
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