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**MODEL REGION OPERATORS:**
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*void* **GR\_Faces**(*PGeomRegn* gr, *int*
*nf, *PGeomFace*
*faces);
Get the model faces that form the boundary of a model region.
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*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).
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* MUST VERIFY THiS WITH CODE VALUES
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*int* **GR\_OnBoundary**(*PGeomRegn* this, *PGeomEntity* gent);
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