Cheers ladies and gentlemen. I guess i'm finally forced to post in here, insted of ninja browsing ^^ After some googling and search in here i'm still troubled with nonmanifolds. I have a character model, nearlly fully modeled in subdiv. and now i want to merge both halfs. So i attached them under subdiv mode, and went into polygon mode to merge-to-center the vertexs, problem is i'm always getting the error: // Error: polyToSubdiv1 (Poly To Subdiv Node): One or more edges is nonmanifold. So, i've done some basic stuff (wich was what i also found on my searches): - I tried cleaning the mesh with the nonmanifold option toggled, and it seems it doesn't do anything. - Checked if i didn't have any irregular polygons, they're all fine, only have a few triangulations on the breasts and i don't have any polygon with more then 4 vertexs. Dunno what else to do, tried converting the subdiv into a polygon and from there i was able to merge everything fine. But for several stupid reasons, i want to finish the model in sub-div and converting back and foward isn't good for the character heart. Any tips on what else i can do to will be apreciated. Cheers, DJ