First you should define what you vector group is (for us ... your audience) and tell us how you plan to use them. Then we might be able to better assist with ideas.
There is some prior art in Wings3D world that would call a collection of adjacent faces ... a "region". I wonder if this is close to what you speak of.
There is some prior art in Wings3D world that would call a collection of adjacent faces ... a "region". I wonder if this is close to what you speak of.