@UbuntuBirdy
@bdfd
@okh
Thank you.
Yes, scissors have different reflections (s1 vs.vn). Maybe it's not so important for such small model but I was trying to achieve as realistic appearance as possible in case somebody wants to make it focus point of an artwork
I was trying to add sweethome3d_window_mirror prefix (super shiny look) but hinge didn't work with it 
I don't know how to stop rotation or translation of openings. Earlier in this thread I asked Emmanuel about what he had announced here
I made third version of folding chair - it seems quite easy to operate (two hinges are in the same place).
folding chair x3.sh3d
Simple .obj file...that's my dream. I almost always remove normals but I'm starting to think that doesn't shrink .obj in my cases (rounded/soften edges - compare size of new chair in two versions 6.3+s and 6.3+vn). I didn't think about origin of vertices - I'll try that. Renaming and removing groups would be easier if I knew better regular expressions My models may look clean but SU thinks otherwise and exports each piece which once was a group (or something like that) as a separate "instance geometry" so I end up with too many groups in my obj (exported fromSH3D).
