typedef int PK_BODY_owb_gap_fill_t; This data type is used to specify how gaps at offset vertices should be filled. It has three values: PK_BODY_owb_gap_fill_round_c fill with circular arc PK_BODY_owb_gap_fill_linear_c fill with tangent extension PK_BODY_owb_gap_fill_natural_c fill with natural curve extension