https://forums.autodesk.com/t5/civil-3d-customization-forum/lisp-program-error-issue/m-p/13816284#M26885 <P>It appears that you had AI write this. Is that the case?&nbsp;</P> Thu, 18 Sep 2025 13:47:07 GMT hippe013 2025-09-18T13:47:07Z https://forums.autodesk.com/t5/civil-3d-customization-forum/lisp-program-error-issue/m-p/13815835#M26884 <P>Hi Experts,</P><P>I tried to resolve this LISP Program, Getting Error, anyone can resolve this please.</P><P>&nbsp;</P><P><STRONG>AutoLISP routine built for AutoCAD Civil 3D that:</STRONG><BR /><STRONG>• asks you to pick an Alignment and TIN Surface,</STRONG><BR /><STRONG>• samples every “input” m along the alignment,</STRONG><BR /><STRONG>• builds a perpendicular Sample Line (you choose left/right width),</STRONG><BR /><STRONG>• extracts every surface intersection point along that perpendicular (Civil 3D’s section engine gives you the exact TIN intersections),</STRONG><BR /><STRONG>• and writes Easting, Northing, Elevation, Station, Offset (signed) to a CSV.</STRONG></P><P>&nbsp;</P><P>&nbsp;</P><P>Best regards,</P><P>PCKU</P> Thu, 18 Sep 2025 08:11:52 GMT https://forums.autodesk.com/t5/civil-3d-customization-forum/lisp-program-error-issue/m-p/13815835#M26884 BDS_Cengannur 2025-09-18T08:11:52Z https://forums.autodesk.com/t5/civil-3d-customization-forum/lisp-program-error-issue/m-p/13816284#M26885 <P>It appears that you had AI write this. Is that the case?&nbsp;</P> Thu, 18 Sep 2025 13:47:07 GMT https://forums.autodesk.com/t5/civil-3d-customization-forum/lisp-program-error-issue/m-p/13816284#M26885 hippe013 2025-09-18T13:47:07Z https://forums.autodesk.com/t5/civil-3d-customization-forum/lisp-program-error-issue/m-p/13817186#M26892 <P>Yes, true ChatGPT</P> Fri, 19 Sep 2025 03:03:40 GMT https://forums.autodesk.com/t5/civil-3d-customization-forum/lisp-program-error-issue/m-p/13817186#M26892 pcmanojkumar 2025-09-19T03:03:40Z