Semi-working Boost.Polygon medial axis. Hangs after perimeters, though. Needs pruning and chaining

lib/Slic3r/Layer/Region.pm

@@ -224,6 +224,16 @@ sub make_perimeters {
     # process thin walls by collapsing slices to single passes
     if (@thin_walls) {
         my @p = map @{$_->medial_axis($pspacing)}, @thin_walls;
+        if (0) {
+            use Slic3r::SVG;
+            Slic3r::SVG::output(
+                "medial_axis.svg",
+                no_arrows => 1,
+                expolygons => \@thin_walls,
+                polylines => \@p,
+            );
+            exit;
+        }
         my @paths = ();
         for my $p (@p) {
             next if $p->length <= $pspacing * 2;