Hi Pilou,

re:
> these hatching must also following the lighting of the object or must be isotropic ?
> (from your examples seems isotropic)

It's possible to do either.

The ones here adapt to lighting and have denser lines (smaller spacing) where the lighting is dark:
http://moi3d.com/forum/index.php?webtag=MOI&msg=10774.2

This one does not respond to lighting:
http://moi3d.com/forum/index.php?webtag=MOI&msg=10774.19

That will be an option that you will be able to set.

- Michael