typedef int PK_blend_fault_t; This data type is used to return blending fault types. In some cases a faulty topological entity is also returned. It has the following values: fault_topol PK_CLASS_... PK_blend_fault_no_blend_c edge has no blend PK_blend_fault_no_fault_c blend is OK PK_blend_fault_tangent_c blend on tangent edge PK_blend_fault_singularity_c vertex blend ends on surface singularity PK_blend_fault_obsolete_c unsupported V1 or V2 blend PK_blend_fault_vertex_c vertex configuration of edges at vertex is too complicated PK_blend_fault_sheet_c edge is laminar PK_blend_fault_general_c vertex edge has non-manifold vertex PK_blend_fault_2_edge_c vertex blend ends on illegal 2 edge vertex PK_blend_fault_chamfer_c edge geometry unsuited to asymmetric chamfer ranges PK_blend_fault_conic_c edge geometry unsuited to asymmetric conic ranges PK_blend_fault_bsurf_c face blend requires invalid extension of B-surface PK_blend_fault_range_c edge range inconsistent with adjacent blended edge PK_blend_fault_type_c edge blend type inconsistent with adjacent blended edge PK_blend_fault_edge_c edge adjoining edge not blended PK_blend_fault_loop_c blend completely overlaps edge loop PK_blend_fault_overlap_c overlapping blends PK_blend_fault_overlap_edge_c edge unblended edge overlapped by blend PK_blend_fault_bad_end_c vertex undetermined problem at end of blend PK_blend_fault_face_c face range of blend on face too large PK_blend_fault_overlap_end_c vertex illegal overlap on end boundary PK_blend_fault_end_c vertex blend has illegal end boundary PK_blend_fault_chamfer_intsec_c vertex can't intersect chamfers at vertex PK_blend_fault_edge_intsec_c edge end boundary intersects unblended edge PK_blend_fault_other_edge_c edge illegal blend on other edge prevented full check PK_blend_fault_cliffedge_c cliff edge blend range inconsistent with cliff edge PK_blend_fault_unknown_c unspecified numerical problem with blend PK_blend_fault_self_int_c face the blend has produced a self-intersecting surface PK_blend_fault_face_face_c face the blend has produced a face-face inconsistency