Ignoring object snap elevations
frequent problem in objects snaps is the inheritance of the Z value when
snapping to a point. GstarCAD addresses this problem with OSNAPZ system
variable. If set to 0, osnap uses
the z-value of the snapped point. If set to 1, it uses the x+y of the snapped point and the current value of
the ELEVATION system variable. Also note that when creating lightweight
polylines, the elevation of the first snap will determine the elevation. After
that, any snap to other elevations will be ignored.