diff --git a/regions.scad b/regions.scad
index 1e453f5..253d91b 100644
--- a/regions.scad
+++ b/regions.scad
@@ -297,7 +297,7 @@ function force_region(poly) = is_path(poly) ? [poly] : poly;
 //       [square([60,10], center=true)]
 //   );
 //   region(rgn);
-module region(r, anchor="origin", spin=0, cp="centroid")
+module region(r, anchor="origin", spin=0, cp="centroid", atype="hull")
 {
     assert(in_list(atype, _ANCHOR_TYPES), "Anchor type must be \"hull\" or \"intersect\"");
     r = force_region(r);
diff --git a/shapes2d.scad b/shapes2d.scad
index 977e942..ad93b84 100644
--- a/shapes2d.scad
+++ b/shapes2d.scad
@@ -1189,7 +1189,8 @@ function supershape(step=0.5, m1=4, m2, n1=1, n2, n3, a=1, b, r, d,anchor=CENTER
         path = [for (i = [steps:-1:1]) let(a=angs[i]) scale*rads[i]*[cos(a), sin(a)]]
     ) reorient(anchor,spin, two_d=true, path=path, p=path, extent=atype=="hull");
 
-module supershape(step=0.5,m1=4,m2=undef,n1,n2=undef,n3=undef,a=1,b=undef, r=undef, d=undef, anchor=CENTER, spin=0) {
+module supershape(step=0.5,m1=4,m2=undef,n1,n2=undef,n3=undef,a=1,b=undef, r=undef, d=undef, anchor=CENTER, spin=0, atype="hull") {
+    assert(in_list(atype, _ANCHOR_TYPES), "Anchor type must be \"hull\" or \"intersect\"");
     path = supershape(step=step,m1=m1,m2=m2,n1=n1,n2=n2,n3=n3,a=a,b=b,r=r,d=d);
     attachable(anchor,spin,extent=atype=="hull", two_d=true, path=path) {
         polygon(path);
diff --git a/skin.scad b/skin.scad
index 3880f08..cf60b33 100644
--- a/skin.scad
+++ b/skin.scad
@@ -1130,7 +1130,7 @@ module sweep(shape, transforms, closed=false, caps, style="min_edge", convexity=
              anchor="origin",cp="centroid",spin=0, orient=UP, atype="hull")
 {
     vnf = sweep(shape, transforms, closed, caps, style);
-    vnf_polyhedron(vnf,convexity=convexity,anchor=anchor, spin=spin, orient=orient, vnf=vnf, atype=atype, cp=cp)
+    vnf_polyhedron(vnf,convexity=convexity,anchor=anchor, spin=spin, orient=orient, atype=atype, cp=cp)
          children();
 }