CGAL users discussion list

["Kevin Xu" <>]

Hi Andreas,

Thanks for your reply.

> What would be the meaning of this?  Faces must be oriented in a consistent
> way, that is two faces sharing an edge, must be  hooked up with two
> opposite halfedges. So the orientation of one face implies the orientation
> of the neighbor faces, and changing the orientation of one face, does
> not really make sense.

The truth is I'm loading a mesh file in which there are indeed some
faces with inconsistent orientation with its neighbors. So, is there
any way to detect this inconsistency during loading the mesh?

> What you can do is have an adapter layer, add a boolean flag to your Face
> type,
> and write an iterator adaptor that when you call operator++ for a halfedge
> circulator internally calls operator--

This is a good idea! But is there a method to make the orientations of
all faces consistent anyway?

Thank you.