>Hi Felix, re: all quads - as far as I know 3D Coat's automated conversion tool would be your best bet. I'm not aware of >any other automated processes right now except maybe in Finite Element Analysis software which does analysis of object >structures for strength and such. I think some of them have some quad meshing mechanisms in them but that software >tends to be extremely expensive.

Hi Michael and Felix,

here's a free Windows software which produces quad meshes. Input format is .ply

http://www.it77.de/studienarbeit/index.htm

Regards
Stefan