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Points obtained from the getpoint function are defined relative to the UCS. Polyline vertices and block insertion points are defined relative to the OCS. Points supplied to AutoCAD commands and the ssget point list are defined relative to the UCS. Points supplied to the ActiveX move method are defined relative to the WCS. As such, change: (IF (= PPA 10) (SETQ PPL (APPEND PPL (LIST PPV)))) To: (IF (= PPA 10) (SETQ PPL (APPEND PPL (LIST (trans PPV pen 1))))) Change: (setq bpt (cdr (assoc 10 (entget (ssname sset ctr))))) To: (setq bpt (trans (cdr (assoc 10 (entget (ssname sset ctr)))) item 0)) Change: (if (= chk 1) (PK:mycopy copyitem bpt fpt)) To: (if (= chk 1) (PK:mycopy copyitem bpt (trans fpt 1 0))) The above is untested, but should get you most of the way there.

I could be that you have UCS not WCS issue...

For Inventor I would recommend equivalent to an HP Zbook with a Core i7, and 16GB RAM minimum, with a high performance NVMe SSD drive. A Surface or any Tablet for that matter doesn't really suit the needs of 3D CAD design in a practical manner. -TZ

Bigal it's what they call quality. I picked one up about 10 years ago, and every so often I check for drivers as well (no luck). But I can still fire it up and plot a test page, all pens fine.

If its lines or plines no arcs there is a mathematical formula for areas based on points. Arcs add an extra level of complexity. (coding by Autodesk) Autodesk pay mathmaticians no doubt a lot of money to make Autocad smart so you will never be told how they did it. Just google Boundary you will find lots of theory about boundaries.

HI how create multi alignment from polylines?