https://forums.autodesk.com/t5/autocad-forum/sometimes-surfpatch-will-not-patch-modeling-operation-error/m-p/3789316#M347709 <P>Is there any reason you can't do as 4 curves (actually only need 2) and Loft instead?</P> Mon, 25 Feb 2013 15:23:12 GMT JDMather 2013-02-25T15:23:12Z https://forums.autodesk.com/t5/autocad-forum/sometimes-surfpatch-will-not-patch-modeling-operation-error/m-p/3789125#M347708 <P>64 bit SP 1.1 applied</P><P>&nbsp;</P><P>Some of the 3D poly-lines refuse to be 'patched' using SURFPATCH (attached DWG)</P><P>Command resultis in this message:</P><P>&nbsp;</P><P>Modeling Operation Error:<BR />Operation unsuccessful.</P><P>Cannot create patch surface from the selected curves.</P><P>&nbsp;</P><P>In the attached DWG, the thinner middle 3D poly does not become a surface using SURFPATCH, can anyone explain why, what is invalid in the 3D poly?</P><P>&nbsp;</P><P>TIA,</P><P>Kevin.</P><P>&nbsp;</P> Mon, 25 Feb 2013 11:57:32 GMT https://forums.autodesk.com/t5/autocad-forum/sometimes-surfpatch-will-not-patch-modeling-operation-error/m-p/3789125#M347708 Anonymous 2013-02-25T11:57:32Z https://forums.autodesk.com/t5/autocad-forum/sometimes-surfpatch-will-not-patch-modeling-operation-error/m-p/3789316#M347709 <P>Is there any reason you can't do as 4 curves (actually only need 2) and Loft instead?</P> Mon, 25 Feb 2013 15:23:12 GMT https://forums.autodesk.com/t5/autocad-forum/sometimes-surfpatch-will-not-patch-modeling-operation-error/m-p/3789316#M347709 JDMather 2013-02-25T15:23:12Z https://forums.autodesk.com/t5/autocad-forum/sometimes-surfpatch-will-not-patch-modeling-operation-error/m-p/3790278#M347710 <P>Thx JD ... removed the end segments and used LOFT</P><P>would still like to have a more detailed message from acad explaining what was invalid</P><P>Thx again</P><P>Kevin.</P><P>&nbsp;</P> Tue, 26 Feb 2013 13:27:19 GMT https://forums.autodesk.com/t5/autocad-forum/sometimes-surfpatch-will-not-patch-modeling-operation-error/m-p/3790278#M347710 Anonymous 2013-02-26T13:27:19Z