Hi PaQ, just a note - often times the research into those areas are oriented towards producing regular meshes for Finite Element Analysis processing (like for structural strength analysis) rather than for use as sub-d cages. Sub-d can be more sensitive to some things such as areas with poles...
So I don't think that a general quadrangulation mechanism is necessarily the same thing as a "make perfect sub-d control cage" mechanism....
- Michael
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