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Calculation the angle of the polygon

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Help me a trigonometric functions problems, i have to calculation the angle of the polygon.

The expression  angle = acos (dot(N(V1),N(V2)))  can't get the degrees great than 180, i have a polygon interior angle great than 180.

How can i judge when negative the angle, I totally forget the  dot product principle.    :D



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You need to check if two adjacent edges are convex or concave.

I used dot product between normal and cross product for that. I also modified how to compute angle between edges. I used neighbour edges instead of edge and normal becouse you got some strange results on some points.

Look at file.

Thanks!  Pezetko.

It really works great.

I have to review the dot product and Normal .


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