Calculation the angle of the polygon

[wateryfield]

Guys.

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.    

Thanks.

angle_between_vectors.hip

[pezetko]

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.

angle_between_vectors.hipnc

[wateryfield]

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 .