I've written a macro feature that cuts up a solid body into N equal sized pieces. Then at the end I run this function on each body.

        public static void AddIdsToBody(this IMacroFeatureData macroFeatureData, IBody2 body)

        {

            if (body == null) throw new ArgumentNullException(nameof(body));

            {

                object FacesNeedId;

                object EdgesNeedId;

                macroFeatureData.GetEntitiesNeedUserId((object)body, out FacesNeedId, out EdgesNeedId);

                var edgesNeedId = (object[]) EdgesNeedId;

                var facesNeedId = (object[]) FacesNeedId;

                int i = 0;

                var empty = new object[] {};

                foreach (var edge in edgesNeedId ?? empty)

                {

                    macroFeatureData.SetEdgeUserId((Edge) edge, i, 0);

                    i++;

                }

                foreach (var face in facesNeedId ?? empty)

                {

                    macroFeatureData.SetFaceUserId((Face2) face, i, 0);

                    i++;

                }

            }

        }

The out parameters are always null. Is this to be expected if nothing is required to be done? I'm suspicious because I can't correctly fillet my final objects. The fillets always jump from one object to the other like the tracking ids are not right.