CGAL users discussion list

[Pierre Alliez <>]

hi Samay,

check the covariance matrix and centroid computation of the PCA component. if you can decompose you polyhedron into a set of tets this will work as the inertia matrix is trivially deduced from the covariance matrix.

Pierre Alliez
INRIA Sophia Antipolis - Mediterranee 
Project-team GEOMETRICA 
http://www-sop.inria.fr/members/Pierre.Alliez/
Tel: +33 4 92 38 76 77
Fax: +33 4 97 15 53 95

Samay Kumar a écrit :

Hello friends,

I wanted to find Center of Mass and Principal axis of 3D object defined in .obj (wavefront). I read that CGAL works with .off file but I think it's not that big deal converting .obj data structure to .off.

So, what I want is to recover center of mass and principal inertial axis of such polyhedron model. Can CGAL help me with this problem?

Waiting for someone's reply.

Thanks in advance,
Samay