This is not exactly a Perl question, but ya'll are some of the smartest people I know, so I thought that I would ask. I am looking to find the certroid of a part. I have a list of verticies and I read them in one at a time. I am looking to be able to distinguish between the outside and the inside of this part. The vertex are given in a continuous line (point to point) but sometimes it is clockwise and other times it is counter-clockwise. I have each part separated so I can concentrate on one part at a time, but I cannot figure a way to use the vertex points to find out where the inside is. I know that if the order was always in a clockwise motion, the the center would always be to the right. But I can't guarantee that it is. I need to do this because I am trying to put notches on the perimeter, not tabs. Any enlightenment you can give on this subject would be great. Thanks.

update (broquaint): title change (was Inside??)

In reply to OT: point inside polyhedron test by stu96art

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