IDSOFF ( face, surfac, revers, ifail )
======================================
Identify surface of face
Can be called from the GO.
Receives:
KI_tag_face *face --- face
Returns:
KI_tag_surface *surfac --- surface
KI_cod_logical *revers --- true if face normal
--- opposed to surface normal
KI_cod_error *ifail --- failure indicator
Specific errors:
KI_missing_geom The given face has no associated surface
Description:
The surface associated with the given face is returned.
'revers' is set to true if the face normal is anti-parallel to the surface
normal. If the direction of the face normal is parallel to the surface
normal, 'revers' is set to false.
