CGAL users discussion list

[Sylvain Pion <>]

 wrote:
> Hello,
> how can i change directly the x, y, z, (w) value of an existing point_3 
> without
> using transform?
> I want to apply my own transformation on the point. I want to to change the x,
> y, and z value for a point in a function and then return the same point with
> the new values.
>
> For example:
>
> Point test(1.0,2.0,3.0)
>
> Point transformation(Point in)
> {
>
> // in.x(5.3)    ???
> // in.y(2.3)    ???
> // in.z(6.4)    ???
>
> return in;
> }
>
> transformation(test);

This is actually an FAQ :
http://www.cgal.org/FAQ.html#modifiable_kernel

Unfortunately, it is not possible to do it with CGAL's kernels
currently.

The only way to modify a point is to construct a new point,
and assign it to the old one, like : p = Point_2(p.x(), p.y()+1); .

--
Sylvain Pion
INRIA Sophia-Antipolis
Geometrica Project-Team
CGAL, http://cgal.org/

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