diff --git a/src/db/db/dbDeepRegion.cc b/src/db/db/dbDeepRegion.cc
index 89201171c..99b5ed41e 100644
--- a/src/db/db/dbDeepRegion.cc
+++ b/src/db/db/dbDeepRegion.cc
@@ -947,6 +947,7 @@ DeepRegion::holes () const
 
     const db::Shapes &s = c->shapes (m_merged_polygons.layer ());
     db::Shapes &st = c->shapes (res->deep_layer ().layer ());
+    db::PolygonRefToShapesGenerator pr (&layout, &st);
 
     for (db::Shapes::shape_iterator si = s.begin (db::ShapeIterator::All); ! si.at_end (); ++si) {
       for (size_t i = 0; i < si->holes (); ++i) {
@@ -956,7 +957,7 @@ DeepRegion::holes () const
           pts.push_back (*p);
         }
         h.assign_hull (pts.begin (), pts.end ());
-        st.insert (h);
+        pr.put (h);
       }
     }
 
@@ -979,6 +980,7 @@ DeepRegion::hulls () const
 
     const db::Shapes &s = c->shapes (m_merged_polygons.layer ());
     db::Shapes &st = c->shapes (res->deep_layer ().layer ());
+    db::PolygonRefToShapesGenerator pr (&layout, &st);
 
     for (db::Shapes::shape_iterator si = s.begin (db::ShapeIterator::All); ! si.at_end (); ++si) {
       db::Polygon h;
@@ -987,7 +989,7 @@ DeepRegion::hulls () const
         pts.push_back (*p);
       }
       h.assign_hull (pts.begin (), pts.end ());
-      st.insert (h);
+      pr.put (h);
     }
 
   }
@@ -1007,20 +1009,32 @@ DeepRegion::rounded_corners (double rinner, double router, unsigned int n) const
 {
   ensure_merged_polygons_valid ();
 
-  //  @@@ scaled instances
+  db::MagnificationReducer red;
+  db::cell_variants_collector<db::MagnificationReducer> vars (red);
+  vars.collect (m_merged_polygons.layout (), m_merged_polygons.initial_cell ());
+
+  //  NOTE: m_merged_polygons is mutable, so why is the const_cast needed?
+  const_cast<db::DeepLayer &> (m_merged_polygons).separate_variants (vars);
 
   db::Layout &layout = m_merged_polygons.layout ();
 
   std::auto_ptr<db::DeepRegion> res (new db::DeepRegion (m_merged_polygons.new_layer ()));
   for (db::Layout::iterator c = layout.begin (); c != layout.end (); ++c) {
 
+    const std::map<db::ICplxTrans, size_t> &v = vars.variants (c->cell_index ());
+    tl_assert (v.size () == size_t (1));
+    double mag = v.begin ()->first.mag ();
+    db::Coord rinner_with_mag = db::coord_traits<db::Coord>::rounded (rinner / mag);
+    db::Coord router_with_mag = db::coord_traits<db::Coord>::rounded (router / mag);
+
     const db::Shapes &s = c->shapes (m_merged_polygons.layer ());
     db::Shapes &st = c->shapes (res->deep_layer ().layer ());
+    db::PolygonRefToShapesGenerator pr (&layout, &st);
 
     for (db::Shapes::shape_iterator si = s.begin (db::ShapeIterator::All); ! si.at_end (); ++si) {
       db::Polygon poly;
       si->polygon (poly);
-      st.insert (db::compute_rounded (poly, rinner, router, n));
+      pr.put (db::compute_rounded (poly, rinner_with_mag, router_with_mag, n));
     }
 
   }
@@ -1033,20 +1047,31 @@ DeepRegion::smoothed (coord_type d) const
 {
   ensure_merged_polygons_valid ();
 
-  //  @@@ scaled instances
+  db::MagnificationReducer red;
+  db::cell_variants_collector<db::MagnificationReducer> vars (red);
+  vars.collect (m_merged_polygons.layout (), m_merged_polygons.initial_cell ());
+
+  //  NOTE: m_merged_polygons is mutable, so why is the const_cast needed?
+  const_cast<db::DeepLayer &> (m_merged_polygons).separate_variants (vars);
 
   db::Layout &layout = m_merged_polygons.layout ();
 
   std::auto_ptr<db::DeepRegion> res (new db::DeepRegion (m_merged_polygons.new_layer ()));
   for (db::Layout::iterator c = layout.begin (); c != layout.end (); ++c) {
 
+    const std::map<db::ICplxTrans, size_t> &v = vars.variants (c->cell_index ());
+    tl_assert (v.size () == size_t (1));
+    double mag = v.begin ()->first.mag ();
+    db::Coord d_with_mag = db::coord_traits<db::Coord>::rounded (d / mag);
+
     const db::Shapes &s = c->shapes (m_merged_polygons.layer ());
     db::Shapes &st = c->shapes (res->deep_layer ().layer ());
+    db::PolygonRefToShapesGenerator pr (&layout, &st);
 
     for (db::Shapes::shape_iterator si = s.begin (db::ShapeIterator::All); ! si.at_end (); ++si) {
       db::Polygon poly;
       si->polygon (poly);
-      st.insert (db::smooth (poly, d));
+      pr.put (db::smooth (poly, d_with_mag));
     }
 
   }
diff --git a/src/db/unit_tests/dbDeepRegionTests.cc b/src/db/unit_tests/dbDeepRegionTests.cc
index dcc86b417..8c7ddfb35 100644
--- a/src/db/unit_tests/dbDeepRegionTests.cc
+++ b/src/db/unit_tests/dbDeepRegionTests.cc
@@ -573,6 +573,82 @@ TEST(9_SizingWithBoolean)
   db::compare_layouts (_this, target, tl::testsrc () + "/testdata/algo/deep_region_au9e.gds");
 }
 
+TEST(10_HullsAndHoles)
+{
+  db::Layout ly;
+  {
+    std::string fn (tl::testsrc ());
+    fn += "/testdata/algo/deep_region_area_peri_l1.gds";
+    tl::InputStream stream (fn);
+    db::Reader reader (stream);
+    reader.read (ly);
+  }
+
+  db::cell_index_type top_cell_index = *ly.begin_top_down ();
+  db::Cell &top_cell = ly.cell (top_cell_index);
+
+  db::DeepShapeStore dss;
+  dss.set_max_vertex_count (4);
+  dss.set_threads (0);
+
+  unsigned int l1 = ly.get_layer (db::LayerProperties (1, 0));
+
+  db::Region r1 (db::RecursiveShapeIterator (ly, top_cell, l1), dss);
+  db::Region r1_sized = r1.sized (2000);
+  r1_sized -= r1;
+
+  db::Region hulls = r1_sized.hulls ();
+  db::Region holes = r1_sized.holes ();
+
+  db::Layout target;
+  unsigned int target_top_cell_index = target.add_cell (ly.cell_name (top_cell_index));
+
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (10, 0)), r1_sized);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (11, 0)), hulls);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (12, 0)), holes);
+
+  CHECKPOINT();
+  db::compare_layouts (_this, target, tl::testsrc () + "/testdata/algo/deep_region_au10.gds");
+}
+
+TEST(11_RoundAndSmoothed)
+{
+  db::Layout ly;
+  {
+    std::string fn (tl::testsrc ());
+    fn += "/testdata/algo/deep_region_area_peri_l1.gds";
+    tl::InputStream stream (fn);
+    db::Reader reader (stream);
+    reader.read (ly);
+  }
+
+  db::cell_index_type top_cell_index = *ly.begin_top_down ();
+  db::Cell &top_cell = ly.cell (top_cell_index);
+
+  db::DeepShapeStore dss;
+  dss.set_max_vertex_count (4);
+  dss.set_threads (0);
+
+  unsigned int l1 = ly.get_layer (db::LayerProperties (1, 0));
+
+  db::Region r1 (db::RecursiveShapeIterator (ly, top_cell, l1), dss);
+  db::Region r1_sized = r1.sized (2000);
+  r1_sized -= r1;
+
+  db::Region rounded = r1_sized.rounded_corners (3000, 5000, 100);
+  db::Region smoothed = rounded.smoothed (100);
+
+  db::Layout target;
+  unsigned int target_top_cell_index = target.add_cell (ly.cell_name (top_cell_index));
+
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (10, 0)), r1_sized);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (11, 0)), rounded);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (12, 0)), smoothed);
+
+  CHECKPOINT();
+  db::compare_layouts (_this, target, tl::testsrc () + "/testdata/algo/deep_region_au11.gds");
+}
+
 TEST(100_Integration)
 {
   db::Layout ly;
diff --git a/testdata/algo/deep_region_au10.gds b/testdata/algo/deep_region_au10.gds
new file mode 100644
index 000000000..b06543d13
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diff --git a/testdata/algo/deep_region_au11.gds b/testdata/algo/deep_region_au11.gds
new file mode 100644
index 000000000..978dd07ad
Binary files /dev/null and b/testdata/algo/deep_region_au11.gds differ