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[tang <>]

Hi Sebastien,

Thank you very much for your kindly reply.

For your example, two spheres, I can understand that normals outer surface
facets point outside of the large sphere, how about inner surface facets? Do
the normals point outside of the inner small sphere? But at this time, they
are also the surfaces of outer domain (large sphere subtract small sphere)
so that the normals point inside of the outer domain.

How to work for this issue: one large box outside with two small boxes
inside with a common interface. There are totally 3 sub-domains. How to
order the vertices of facets on the common interface? Since at this time the
normals of these facets would point inside one of the small box anyway.

Thanks,
Tang Laoya



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