HI,
I'm modelling a Porsche 959 in Sub-d's. I modelled only 1 half of the body and used an instanced copy for the other half while I modelled. Now I've finished the body and I want to merge the 2 halves together (I've replaced the instanced copy with a mirror for the merge). I can attatch the 2 Sub-d objects together, but when I switch to poly proxy mode again and try to merge the verts it says that it can't because the edges are nonmanifold.

So, this all creates a few questions...
1) How do people normally merge 2 sub-d objects?
2) What does nonmanifold mean and how can I avoid it in the future?
3) How should I fix my problem?

I'd rather not convert to low-poly, merge, then convert back to sub-d because I'll have to make all my edge creases and tweaks again. But if this is what needs to be done then I guess I'll have to do it.

thanx