CGAL users discussion list

[Mariette Yvinec <>]

Dmitry Kan wrote:

On 25/01/07, Andreas Fabri <> wrote:

wrote:
> Hello list!
>
> Is it possible to calculate the volume of a constructed 3D alpha shape?


If it is watertight sum up the volumes of the tetrahedra.
If it is not watertight there is no volume.

andreas
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I'm a newbie to the library and a got a bit messed.

I've found the following code in examples:

        typedef Alpha_shape_3::Cell_handle                    Cell_handle;
        std::list<Cell_handle> cells;
        as.get_alpha_shape_cells(back_inserter(cells), Alpha_shape_3::INTERIOR);
        cout << cells.size() << " interior tetrahedra" << std::endl;

Is it correct way to fetch tetrahedra? If yes, how can I get the volumes now?

--
best wishes,
Dmitry Kan

compute the volume of each tetrahedra in cells
and add them up