152     , fFirstEdgeBelow(nullptr), fLastEdgeBelow(nullptr)  in Vertex()
165     Edge*   fFirstEdgeBelow;      // Linked list of edges below this vertex.  member
889     for (next = v->fFirstEdgeBelow; next; next = next->fNextEdgeBelow) {  in insert_edge_below()
896         edge, prev, next, &v->fFirstEdgeBelow, &v->fLastEdgeBelow);  in insert_edge_below()
912         edge, &edge->fTop->fFirstEdgeBelow, &edge->fTop->fLastEdgeBelow);  in remove_edge_below()
931         for (Edge* e = v->fFirstEdgeBelow; e; e = e->fNextEdgeBelow) {  in rewind()
1163     while (Edge* edge = src->fFirstEdgeBelow) {  in merge_vertices()
1429         for (Edge* e = v->fFirstEdgeBelow; e; e = e->fNextEdgeBelow) {  in dump_mesh()
1478         if (!v->fFirstEdgeAbove && !v->fFirstEdgeBelow) {  in simplify()
1490             if (v->fFirstEdgeBelow) {  in simplify()
1491                 for (Edge* edge = v->fFirstEdgeBelow; edge; edge = edge->fNextEdgeBelow) {  in simplify()
1519         for (Edge* e = v->fFirstEdgeBelow; e; e = e->fNextEdgeBelow) {  in simplify()
1535         if (!v->fFirstEdgeAbove && !v->fFirstEdgeBelow) {  in tessellate()
1560         for (Edge* e = v->fFirstEdgeBelow; e; e = e->fNextEdgeBelow) {  in tessellate()
1583             if (!v->fFirstEdgeBelow) {  in tessellate()
1591         if (v->fFirstEdgeBelow) {  in tessellate()
1610             Edge* leftEdge = v->fFirstEdgeBelow;  in tessellate()
1642         if (!v->fFirstEdgeAbove && !v->fFirstEdgeBelow) {  in remove_non_boundary_edges()
1661         for (Edge* e = v->fFirstEdgeBelow; e; e = e->fNextEdgeBelow) {  in remove_non_boundary_edges()
1755     for (Edge* e = src->fFirstEdgeBelow; e; ) {  in reconnect_all_overlap_edges()
1790     top->fPartner = top->fFirstEdgeAbove || top->fFirstEdgeBelow ? dest : nullptr;  in apply()
1793     bottom->fPartner = bottom->fFirstEdgeAbove || bottom->fFirstEdgeBelow ? dest : nullptr;  in apply()
1813         if (!v->fFirstEdgeAbove && !v->fFirstEdgeBelow) {  in collapse_overlap_regions()
1827         for (Edge* e = v->fFirstEdgeBelow; e; e = e->fNextEdgeBelow) {  in collapse_overlap_regions()
2065         while (v->fFirstEdgeBelow) {  in extract_boundaries()
2067             extract_boundary(&boundary, v->fFirstEdgeBelow, fillType, alloc);  in extract_boundaries()
2206         for (Edge* e = v->fFirstEdgeBelow; e; e = e->fNextEdgeBelow) {  in count_outer_mesh_points()
2215         for (Edge* e = v->fFirstEdgeBelow; e; e = e->fNextEdgeBelow) {  in outer_mesh_to_triangles()