typedef int PK_FIN_type_t; This datatype contains classification data for a fin. Value can be one of: PK_FIN_type_wire_c The fin's owning edge has another fin in the same face, and both fins are in the same loop. PK_FIN_type_biwire_c The fin's owning edge has another fin in the same face, but the two fins are in different loops. PK_FIN_type_normal_c The fin's owning edge has no other fin in the same face.