CGAL users discussion list

[Philipp Moeller <>]

costantinos 
<>
 writes:

> Hi,
>
> I am trying to transform a 3d point to 2d and then back to 3d, however I
> noticed that there is a very small error when the original point is returned
> to 3d. Is this an bug or to be expected? Please see the example below. Thank
> you.

Which kernel are you using?

>
>
>     Plane_3 pl3(0,0,0.36,-0.32652);
>     
>     Point_3 pt3(0.6,0,0.907);
>     Point_2 pt2 = pl3.to_2d(pt3);
>     Point_3 pt3_2 = pl3.to_3d(pt2);
>     
>     std::cout << pt3 - pt3_2 << std::endl;
>
>
> Output:
>
> 0 0 1.11022e-16