https://community.graphisoft.com/t5/Libraries-objects/How-to-locate-the-source-object-of-a-3D-quot-Warning-quot/m-p/136826#M14349 By isolating divisions of the project using the marquee, then further subdividing until you isolate the problem elements.<BR /> <BR /> You can also use the "Select all" function to pick all walls, slabs, etc, to isolate the trouble element category. Tue, 16 Apr 2013 05:21:03 GMT Dwight 2013-04-16T05:21:03Z https://community.graphisoft.com/t5/Libraries-objects/How-to-locate-the-source-object-of-a-3D-quot-Warning-quot/m-p/136825#M14348 <DIV class="actalk-migrated-content"><T>I've opened an old AC12 project in AC16, consolidated the libraries, etc.<BR /> <BR /> However, I get 3 "Warning!" messages stating "Normal vector and edge 317 is not perpendicular in pgon 142"<BR /> <BR /> How do I find out which object, or objects, are causing the problem?</T></DIV> Tue, 16 Apr 2013 05:06:04 GMT https://community.graphisoft.com/t5/Libraries-objects/How-to-locate-the-source-object-of-a-3D-quot-Warning-quot/m-p/136825#M14348 Anonymous 2013-04-16T05:06:04Z https://community.graphisoft.com/t5/Libraries-objects/How-to-locate-the-source-object-of-a-3D-quot-Warning-quot/m-p/136826#M14349 By isolating divisions of the project using the marquee, then further subdividing until you isolate the problem elements.<BR /> <BR /> You can also use the "Select all" function to pick all walls, slabs, etc, to isolate the trouble element category. Tue, 16 Apr 2013 05:21:03 GMT https://community.graphisoft.com/t5/Libraries-objects/How-to-locate-the-source-object-of-a-3D-quot-Warning-quot/m-p/136826#M14349 Dwight 2013-04-16T05:21:03Z https://community.graphisoft.com/t5/Libraries-objects/How-to-locate-the-source-object-of-a-3D-quot-Warning-quot/m-p/136827#M14350 If the error message reports an ID, you can use it with the "Find &amp; Select" command (provided it's not a macro object called from another) Tue, 16 Apr 2013 06:29:34 GMT https://community.graphisoft.com/t5/Libraries-objects/How-to-locate-the-source-object-of-a-3D-quot-Warning-quot/m-p/136827#M14350 rocorona 2013-04-16T06:29:34Z