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[evantong623 <>]

Thank you so much!
You are right. I should make sure the exterior cell are not included in
calculating the alpha shape volume. So my program ends up to be:
......
for(Alpha_shape_3::Finite_cells_iterator it = as.finite_cells_begin(); it !=
as.finite_cells_end(); it++)
{
        if(as.classify(it)==Alpha_shape_3::INTERIOR)
        {
                Tetrahedron_3 tetr = as.tetrahedron(it);
                alpha_volume += tetr.volume();
        }
}
......
Also thanks to Mariette, even I did not find a way to test the
"alpha_spectrum".



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