diff --git a/src/drc/unit_tests/drcSimpleTests.cc b/src/drc/unit_tests/drcSimpleTests.cc
index 3cba9b295..113c9b43a 100644
--- a/src/drc/unit_tests/drcSimpleTests.cc
+++ b/src/drc/unit_tests/drcSimpleTests.cc
@@ -957,3 +957,83 @@ TEST(21_breaking)
   db::compare_layouts (_this, layout, au, db::NoNormalization);
 }
 
+TEST(22_opposite_filter)
+{
+  std::string rs = tl::testsrc ();
+  rs += "/testdata/drc/drcSimpleTests_22.drc";
+
+  std::string input = tl::testsrc ();
+  input += "/testdata/drc/drcSimpleTests_22.gds";
+
+  std::string au = tl::testsrc ();
+  au += "/testdata/drc/drcSimpleTests_au22.gds";
+
+  std::string output = this->tmp_file ("tmp.gds");
+
+  {
+    //  Set some variables
+    lym::Macro config;
+    config.set_text (tl::sprintf (
+        "$drc_test_source = '%s'\n"
+        "$drc_test_target = '%s'\n"
+      , input, output)
+    );
+    config.set_interpreter (lym::Macro::Ruby);
+    EXPECT_EQ (config.run (), 0);
+  }
+
+  lym::Macro drc;
+  drc.load_from (rs);
+  EXPECT_EQ (drc.run (), 0);
+
+  db::Layout layout;
+
+  {
+    tl::InputStream stream (output);
+    db::Reader reader (stream);
+    reader.read (layout);
+  }
+
+  db::compare_layouts (_this, layout, au, db::NoNormalization);
+}
+
+TEST(23_rect_filter)
+{
+  std::string rs = tl::testsrc ();
+  rs += "/testdata/drc/drcSimpleTests_23.drc";
+
+  std::string input = tl::testsrc ();
+  input += "/testdata/drc/drcSimpleTests_23.gds";
+
+  std::string au = tl::testsrc ();
+  au += "/testdata/drc/drcSimpleTests_au23.gds";
+
+  std::string output = this->tmp_file ("tmp.gds");
+
+  {
+    //  Set some variables
+    lym::Macro config;
+    config.set_text (tl::sprintf (
+        "$drc_test_source = '%s'\n"
+        "$drc_test_target = '%s'\n"
+      , input, output)
+    );
+    config.set_interpreter (lym::Macro::Ruby);
+    EXPECT_EQ (config.run (), 0);
+  }
+
+  lym::Macro drc;
+  drc.load_from (rs);
+  EXPECT_EQ (drc.run (), 0);
+
+  db::Layout layout;
+
+  {
+    tl::InputStream stream (output);
+    db::Reader reader (stream);
+    reader.read (layout);
+  }
+
+  db::compare_layouts (_this, layout, au, db::NoNormalization);
+}
+
diff --git a/testdata/drc/drcSimpleTests_19.drc b/testdata/drc/drcSimpleTests_19.drc
index 60d92f511..e92ef5d58 100644
--- a/testdata/drc/drcSimpleTests_19.drc
+++ b/testdata/drc/drcSimpleTests_19.drc
@@ -14,3 +14,13 @@ l1.space(3.0, shielded, projection).output(101, 0)
 l2.separation(l1, 3.0, transparent, projection).output(110, 0)
 l2.separation(l1, 3.0, shielded, projection).output(111, 0)
 
+deep 
+
+l1 = input(1, 0)
+l2 = input(2, 0)
+
+l1.space(3.0, transparent, projection).output(200, 0)
+l1.space(3.0, shielded, projection).output(201, 0)
+l2.separation(l1, 3.0, transparent, projection).output(210, 0)
+l2.separation(l1, 3.0, shielded, projection).output(211, 0)
+
diff --git a/testdata/drc/drcSimpleTests_22.drc b/testdata/drc/drcSimpleTests_22.drc
new file mode 100644
index 000000000..87398645c
--- /dev/null
+++ b/testdata/drc/drcSimpleTests_22.drc
@@ -0,0 +1,25 @@
+
+# shielded/transparent
+
+source($drc_test_source, "TOP")
+target($drc_test_target)
+
+l1 = input(1, 0)
+l2 = input(2, 0)
+
+l1.output(1, 0)
+l2.output(2, 0)
+
+l1.separation(l2, 3.0, projection).output(100, 0)
+l1.separation(l2, 3.0, not_opposite, projection).output(110, 0)
+l1.separation(l2, 3.0, only_opposite, projection).output(111, 0)
+
+deep
+
+l1 = input(1, 0)
+l2 = input(2, 0)
+
+l1.separation(l2, 3.0, projection).output(200, 0)
+l1.separation(l2, 3.0, not_opposite, projection).output(210, 0)
+l1.separation(l2, 3.0, only_opposite, projection).output(211, 0)
+
diff --git a/testdata/drc/drcSimpleTests_22.gds b/testdata/drc/drcSimpleTests_22.gds
new file mode 100644
index 000000000..59cf4283e
Binary files /dev/null and b/testdata/drc/drcSimpleTests_22.gds differ
diff --git a/testdata/drc/drcSimpleTests_23.drc b/testdata/drc/drcSimpleTests_23.drc
new file mode 100644
index 000000000..a55e9771e
--- /dev/null
+++ b/testdata/drc/drcSimpleTests_23.drc
@@ -0,0 +1,35 @@
+
+# shielded/transparent
+
+source($drc_test_source, "TOP")
+target($drc_test_target)
+
+l1 = input(1, 0)
+l2 = input(2, 0)
+
+l1.output(1, 0)
+l2.output(2, 0)
+
+l1.separation(l2, 3.0, projection).output(100, 0)
+l1.separation(l2, 3.0, one_side_allowed, projection).output(110, 0)
+l1.separation(l2, 3.0, two_sides_allowed, projection).output(111, 0)
+l1.separation(l2, 3.0, two_opposite_sides_allowed, projection).output(112, 0)
+l1.separation(l2, 3.0, two_connected_sides_allowed, projection).output(113, 0)
+l1.separation(l2, 3.0, three_sides_allowed, projection).output(114, 0)
+l1.separation(l2, 3.0, four_sides_allowed, projection).output(115, 0)
+l1.separation(l2, 3.0, one_side_allowed, two_opposite_sides_allowed, projection).output(116, 0)
+
+deep
+
+l1 = input(1, 0)
+l2 = input(2, 0)
+
+l1.separation(l2, 3.0, projection).output(200, 0)
+l1.separation(l2, 3.0, one_side_allowed, projection).output(210, 0)
+l1.separation(l2, 3.0, two_sides_allowed, projection).output(211, 0)
+l1.separation(l2, 3.0, two_opposite_sides_allowed, projection).output(212, 0)
+l1.separation(l2, 3.0, two_connected_sides_allowed, projection).output(213, 0)
+l1.separation(l2, 3.0, three_sides_allowed, projection).output(214, 0)
+l1.separation(l2, 3.0, four_sides_allowed, projection).output(215, 0)
+l1.separation(l2, 3.0, one_side_allowed, two_opposite_sides_allowed, projection).output(216, 0)
+
diff --git a/testdata/drc/drcSimpleTests_23.gds b/testdata/drc/drcSimpleTests_23.gds
new file mode 100644
index 000000000..1d93b5368
Binary files /dev/null and b/testdata/drc/drcSimpleTests_23.gds differ
diff --git a/testdata/drc/drcSimpleTests_au19.gds b/testdata/drc/drcSimpleTests_au19.gds
index 9365b7245..17f23c524 100644
Binary files a/testdata/drc/drcSimpleTests_au19.gds and b/testdata/drc/drcSimpleTests_au19.gds differ
diff --git a/testdata/drc/drcSimpleTests_au22.gds b/testdata/drc/drcSimpleTests_au22.gds
new file mode 100644
index 000000000..471a416b7
Binary files /dev/null and b/testdata/drc/drcSimpleTests_au22.gds differ
diff --git a/testdata/drc/drcSimpleTests_au23.gds b/testdata/drc/drcSimpleTests_au23.gds
new file mode 100644
index 000000000..3e2854d70
Binary files /dev/null and b/testdata/drc/drcSimpleTests_au23.gds differ