On Wed, 09 Jun 1999 09:18:26 GMT, Jerry Anning wrote:
>vnormalize(vcross(b-a, c-a)+vcross(c-a,d-a)+vcross(d-a,e-a)...)
>Make sure that you are consistent in the sense (clockwise or
>counterclockwise) in which you go around the vertex.

You sure about that?  I think you might get some unintentional
weighting in your average, making the resultant vector lean a bit
towards the longer edges.  I would have thought you'd have to 
normalize all the cross products first, then normalize the result.

Of course, I haven't really thought about it, so I could be wrong.

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