CGAL users discussion list

["Tardugno, Angelo" <>]

Hi all,

I need to compute the angle between two vectors. I've got two Vector_3 objects and I was thinking to compute their dot product and then divide this by the product of the magnitude of the two vectors. The problem is that I can't evaluate the sqrt of the sum of the squared components of the vectors. Is there an in-built function that computes the magnitude of a vector.

 

Another possibility would be using Direction_3, but it seems that there is no dot product defined for this object.

Anyway, if I transform my vectors into Direction_3 objects and then I transform the Direction_3 objects into vector do I end up with unit vectors? In this case I could easily evaluate the dot product of these vectors and I have solved my problems.

Thank You

Angelo