diff --git a/vnf.scad b/vnf.scad
index abc82f02..bc127f48 100644
--- a/vnf.scad
+++ b/vnf.scad
@@ -40,15 +40,18 @@ EMPTY_VNF = [[],[]];  // The standard empty VNF with no vertices or faces.
 //   and creating the faces defined by those edges.  You can optionally create the edges and faces to wrap the last column
 //   back to the first column, or wrap the last row to the first.  Endcaps can be added to either
 //   the first and/or last rows.  The style parameter determines how the quadrilaterals are divided into
-//   triangles.  The default style is an arbitrary, systematic subdivision in the same direction.  The "alt" style
-//   is the uniform subdivision in the other (alternate) direction.  The "flip1" style is an arbitrary division that alternates the
-//   direction for any adjacent pair of quadrilaterals.  The "flip2" style is the alternating division that is the opposite of "flip1". 
-//   The "min_edge" style picks the shorter edge to
-//   subdivide for each quadrilateral, so the division may not be uniform across the shape.  The "quincunx" style
-//   adds a vertex in the center of each quadrilateral and creates four triangles, and the "convex" and "concave" styles
-//   choose the locally convex/concave subdivision.  The "min_area" option creates the triangulation with the minimal area.
-//   The "quad" style makes quadrilateral edges, which may not be coplanar, relying on OpensCAD to decide how to handle them.  Degenerate faces
-//   are not included in the output, but if this results in unused vertices, those unused vertices do still appear in the output.
+//   triangles.  The styles are:
+//   * "default" — arbitrary, systematic subdivision in the same direction
+//   * "alt" — uniform subdivision in the other (alternate) direction
+//   * "flip1" — arbitrary division that alternates the direction adjacent pairs of quadrilaterals.
+//   * "flip2" — the alternating division that is the opposite of "flip1". 
+//   * "min_edge" — subdivide each quadrilateral on its shorter edge, so the division may not be uniform across the shape
+//   * "min_area" — creates the triangulation with the minimal area.
+//   * "quincunx" — adds a vertex in the center of each quadrilateral and creates four triangles
+//   * "convex" — choose the locally convex division
+//   * "concave" — choose the locally concave division
+//   * "quad" — makes quadrilateral edges, which may not be coplanar, relying on OpensCAD to decide how to handle them.
+// Degenerate faces are not included in the output, but if this results in unused vertices, those unused vertices do still appear in the output.
 //   .
 //   You can apply a texture to the vertex array VNF using the usual texture parameters.
 //   See [Texturing](skin.scad#section-texturing) for more details on how textures work.  
@@ -388,9 +391,6 @@ function vnf_vertex_array(
                         style=="quincunx"?
                           let(i5 = pcnt + r*colcnt + c)
                           [[i1,i5,i2],[i2,i5,i3],[i3,i5,i4],[i4,i5,i1]]
-                      : style=="alt" || (style=="flip1" && ((r+c)%2==0)) || (style=="flip2" && ((r+c)%2==1)) || (style=="random" && rands(0,1,1)[0]<.5)?
-                          [[i1,i4,i2],[i2,i4,i3]]
-                      : style=="default" ? [[i1,i3,i2],[i1,i4,i3]]
                       : style=="min_area"?
                           let(
                                area42 = norm(cross(pts[i2]-pts[i1], pts[i4]-pts[i1]))+norm(cross(pts[i4]-pts[i3], pts[i2]-pts[i3])),
@@ -429,7 +429,10 @@ function vnf_vertex_array(
                                     : [[i1,i3,i2],[i1,i4,i3]]
                           )
                           concavefaces
-                      : [[i1,i2,i3,i4]],
+                      : style=="quad" ? [[i1,i2,i3,i4]]
+                      : style=="alt" || (style=="flip1" && ((r+c)%2==0)) || (style=="flip2" && ((r+c)%2==1)) || (style=="random" && rands(0,1,1)[0]<.5)?
+                          [[i1,i4,i2],[i2,i4,i3]]
+                      : [[i1,i3,i2],[i1,i4,i3]],
                    // remove degenerate faces
                    culled_faces= [for(face=faces)
                        if (norm(cross(verts[face[1]]-verts[face[0]],