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    CGAL 6.1 - 3D Alpha Shapes
    
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#include <CGAL/Fixed_alpha_shape_vertex_base_3.h>
Vb.
The class Fixed_alpha_shape_vertex_base_3 is the default model for the concept FixedAlphaShapeVertex_3. 
| Traits | is the geometric traits class that is provided to the Alpha_shape_3 class.  | 
| Vb | must be a vertex base class adapted to the type of triangulation that is being used. By default, it is instantiated with Triangulation_vertex_base_3<Traits>, which is appropriate for basic alpha shapes. | 
FixedAlphaShapeVertex_3