CGAL users discussion list

[Andreas Fabri <>]

naresh wrote:
> Hi
>  
> How can i save  Alpha_shape_3 to .off file. ? I want to save 
> trianglulated shape to off  file .
>  
> Is that any way to save it ?
>  
>  
> Alex
>  

Hi Alex,

You have to code it by hand, but that shouldn't be too dificult.

print the header with the number of vertices and facets


Use a std::map<Vertex_handle, int>, traverse all alpha shape
vertices, check if they are in the map, and if not, put them in
there and increment a counter that started at 0.  At the same
time print the x y z


Traverse all alpha shape facets and for the three vertices of the
facet read the indices from the map   Print   3 i j k
where "3" indicates that the face has three vertices.

Hope this helps,

andreas