CGAL users discussion list

[Marc Glisse <>]

On Thu, 27 Oct 2011, damian wrote:

> I find the manual's description on Aff_transformation_2 quite unhelpful and
> it is even sparser for Aff_transformation_3.
> If I've got a direction Direction_3 object and want to rotate another
> Vector_3-object around that Direction, how do I manage that?

It looks like there is no convenient constructor for this. The best you 
can do is compute the transformation matrix yourself and feed its 
coefficients to Aff_transformation_3. Note that you can do it in several 
steps, first a change of basis so that your Direction_3 is the new z-axis, 
then the rotation, then the inverse of the first change, and multiply (aka 
compose) the 3 transformations.

--
Marc Glisse