CGAL users discussion list

[Mael <>]

Hello,

Your mesh does not describe a valid polygon mesh because it is not properly oriented. You should first load it as a polygon soup using "CGAL::read_OFF()":

std::vector<Point_3> points;
std::vector<std::vector<std::size_t> > triangles;
CGAL::read_OFF(istream, points, triangles);

and then orienting it properly with orient_polygon_soup() and polygon_soup_to_polygon_mesh().

Here it is properly oriented and saved as a polygon mesh: https://gist.github.com/MaelRL/1667b4d1f655f44f41ba7f839c79f1bf

Best,
Mael

 31/07/2019 19:32, Shrabani Ghosh wrote:

Hi Users,

I am edge_collapse_surface_mesh to decimate triangles , I tried with few
data from cgal it works properly. 
size 07338
Finished...
7338 edges removed.
999 final edges.


But when I am using one of my skull data which I converted from vtk to off
format using meshlab, in that case, the surface mesh can read the file but
cannot calculate even number of edges.
size 00
Finished...
0 edges removed.
0 final edges.

Which is that happening so? I have attached my file here. 




Please suggest me how to fix the problem. 

holes_tri.off
<http://cgal-discuss.949826.n4.nabble.com/file/t376134/holes_tri.off>  



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