if (gp_Vec(aP1, aP2).IsParallel(gp_Vec(aP1, aP3), Precision::Angular()))
Standard_ConstructionError::Raise("Plane creation aborted: points lay on one line");
GC_MakePlane aMakePlane (aP1, aP2, aP3);
if (gp_Vec(aP1, aP2).IsParallel(gp_Vec(aP1, aP3), Precision::Angular()))
Standard_ConstructionError::Raise("Plane creation aborted: points lay on one line");
GC_MakePlane aMakePlane (aP1, aP2, aP3);