typedef int PK_replace_merge_t; Adjacent faces that were previously non-mergeable may become mergeable when the surface of one or both faces is replaced. This datatype specifies the level of merging that should be performed where feasible. Merging is recommended when adjacent faces are to acquire identical surfaces. No merging will be attempted for edges for which replacement curves have been provided. It has the values: PK_replace_merge_no_c No replace-specific merging will be performed. Merging may still occur when healing is required to ensure integrity of the final part. PK_replace_merge_in_c Faces included in the given set of faces which will be merged together if feasible. Vertices on the boundary of the merged face will be merged if feasible, additional faces will not be merged to achieve this. PK_replace_merge_out_c Faces included in the given set and faces that are not, but share at least one common edge with faces in the given set, will be merged if feasible. Faces not in the given set and sharing only a vertex with faces in the given set will not be merged. Vertices on the boundary of the merged face will be merged if feasible, additional faces will not be merged to achieve this.