CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

As you said you need to remove the typedef using Ray_2 in Alpha_shape_2.

Sebastien.

nsoonhui wrote:
> Thanks, Sebastien. 
>
> I see that this Projection_traits_xy_3 is only available in 3.8, and now I
> am stuck at 3.7.
>
> My question is can we use Projection_traits_xy_3 for 2D alpha shapes, like
> how we use it for 3D mesh shape?
>
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