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   MODEL REGION OPERATORS: 

void GR_Faces(PGeomRegn gr, int nf, *PGeomFace *faces);

Get the model faces that form the boundary of a model region.

int GR_FaceDir(PGeomRegn gr, PGeomFace gf);

Get the sense in which a model region is using a face, i.e., is the

face normal pointing into the region (return value 0), out of the

region (return value 1), both (return value 2) or none (return value

-1). * * * *

• MUST VERIFY THiS WITH CODE VALUES * * * * * *

int GR_OnBoundary(PGeomRegn this, PGeomEntity gent);

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