@jan steinman said: @honoluludesktop said: Draw a edge creating two triangles out of the quadrangle, if triangler faces are then created, the 4 edges are not coplanar. If not, perhaps the edges are not joined together. Yea, I tried that, and it seems the quad is not coplanar. Sigh. I used the line tool to make four vertical lines and entered precise lengths, then connected the ends. Any thoughts on why the result should not be coplanar? Perhaps I just slipped. Oh well, tear it apart and try again, I guess... Unless you post the problematic xxx.skp file you have everyone guessing. If you want to learn post it!

Hi folks. The Space Navigator is a usefull device. I can pan, zoom and orbit with my left hand while I add details with the right hand. Just ideas.