Fixed worm() face normals.

gears.scad

@@ -1287,7 +1287,8 @@ function worm(
             )
             apply(zrot(a)*up(z), path3d(cross_sect))
         ],
-        vnf1 = vnf_vertex_array(profiles, caps=true, col_wrap=true, reverse=true, style="alt"),
+        rprofiles = [ for (prof=profiles) reverse(prof) ],
+        vnf1 = vnf_vertex_array(rprofiles, caps=true, col_wrap=true, style="quincunx"),
         vnf = left_handed? xflip(p=vnf1) : vnf1
     ) reorient(anchor,spin,orient, d=d, l=l, p=vnf);
 

vnf.scad

@@ -188,6 +188,15 @@ function vnf_compact(vnf) =
     ) vnf_add_faces(faces=faces);
 
 
+// Function: vnf_reverse_faces()
+// Usage:
+//   rvnf = vnf_reverse_faces(vnf);
+// Description:
+//   Reverses the facing of all the faces in the given VNF.
+function vnf_reverse_faces(vnf) =
+    [vnf[0], [for (face=vnf[1]) reverse(face)]];
+
+
 // Function: vnf_triangulate()
 // Usage:
 //   vnf2 = vnf_triangulate(vnf);