CGAL 5.4.4  3D Alpha Shapes

#include <CGAL/Fixed_alpha_shape_cell_base_3.h>
Cb.
The class Fixed_alpha_shape_cell_base_3
is the default model for the concept FixedAlphaShapeCell_3
.
Traits  is the geometric traits class that is provided to the Alpha_shape_3 class. 
Cb  must be a cell base class adapted to the type of triangulation that is being used. By default, it is instantiated with Delaunay_triangulation_cell_base_3<Traits> , which is appropriate for basic alpha shapes. 