diff --git a/lib/Slic3r/GUI.pm b/lib/Slic3r/GUI.pm
index 077b5625b..5ac8afe4d 100644
--- a/lib/Slic3r/GUI.pm
+++ b/lib/Slic3r/GUI.pm
@@ -40,6 +40,7 @@ use Wx 0.9901 qw(:bitmap :dialog :icon :id :misc :systemsettings :toplevelwindow
     :filedialog :font);
 use Wx::Event qw(EVT_IDLE EVT_COMMAND);
 use base 'Wx::App';
+#use base 'Wx::AppConsole';
 
 use constant FILE_WILDCARDS => {
     known   => 'Known files (*.stl, *.obj, *.amf, *.xml)|*.stl;*.STL;*.obj;*.OBJ;*.amf;*.AMF;*.xml;*.XML',
diff --git a/lib/Slic3r/GUI/MainFrame.pm b/lib/Slic3r/GUI/MainFrame.pm
index a3e34c73c..6ea6049ba 100644
--- a/lib/Slic3r/GUI/MainFrame.pm
+++ b/lib/Slic3r/GUI/MainFrame.pm
@@ -284,8 +284,13 @@ sub _init_menubar {
         $self->_append_menu_item($helpMenu, "&About Slic3r", 'Show about dialog', sub {
             wxTheApp->about;
         });
+        if (Slic3r::GUI::debugged()) {
+            $self->_append_menu_item($helpMenu, "&Debug", 'Break to debugger', sub {
+                Slic3r::GUI::break_to_debugger();
+            });
+        }
     }
-    
+
     # menubar
     # assign menubar to frame after appending items, otherwise special items
     # will not be handled correctly
diff --git a/slic3r.sublime-project b/slic3r.sublime-project
index 9f2586dc8..9deb0e273 100644
--- a/slic3r.sublime-project
+++ b/slic3r.sublime-project
@@ -28,7 +28,7 @@
 			"name": "xs & run",
 			"working_dir": "$project_path/xs",
   			"file_regex": "^(..[^:]*):([0-9]+):?([0-9]+)?:? (.*)$",
-			"shell_cmd": "perl Build install & perl ..\\slic3r.pl --gui \"..\\..\\Slic3r-tests\\star3-big2.stl\""
+			"shell_cmd": "perl Build install & cd .. & perl slic3r.pl --gui \"..\\Slic3r-tests\\star3-big2.stl\""
 		}
 	],
 	"folders":
@@ -36,5 +36,26 @@
 		{
 			"path": "."
 		}
-	]
+	],
+
+    "settings":
+    {
+        "sublimegdb_workingdir": "${folder:${project_path:run}}",
+  		// NOTE: You MUST provide --interpreter=mi for the plugin to work
+//    	"sublimegdb_commandline": "D:\\Qt\\Tools\\mingw492_32\\bin\\gdb.exe --interpreter=mi -ex 'target localhost:2345'",
+//    	"sublimegdb_commandline": "D:\\Qt\\Tools\\mingw492_32\\bin\\gdb.exe --interpreter=mi perl --args perl slic3r.pl",
+//    	"sublimegdb_commandline": "D:\\Qt\\Tools\\mingw492_32\\bin\\gdb.exe --interpreter=mi perl --args slic3r.pl ",
+//    	"sublimegdb_commandline": "D:\\Qt\\Tools\\mingw492_32\\bin\\gdb.exe --interpreter=mi -e C:\\Strawberry\\perl\\bin\\perl.exe -s C:\\Strawberry\\perl\\site\\lib\\auto\\Slic3r\\XS\\XS.xs.dll --args perl slic3r.pl -j 1 --gui D:\\src\\Slic3r-tests\\star3-big.stl",
+    	"sublimegdb_commandline": "D:\\Qt\\Tools\\mingw492_32\\bin\\gdb.exe --interpreter=mi perl.exe --args perl slic3r.pl -j 1 --gui", //  D:\\src\\Slic3r-tests\\star3-big.stl",
+//    	"sublimegdb_commandline": "D:\\Qt\\Tools\\mingw492_32\\bin\\gdb.exe --interpreter=mi -x slic3r.gdb",
+//    	"arguments": "slic3r -j 1 --gui ../Slic3r-tests/star3-big.stl",
+//	  	"arguments": "../slic3r.pl -j 1 --gui",
+//        "sublimegdb_exec_cmd": "-exec-continue",
+    	
+    	// Add "pending breakpoints" for symbols that are dynamically loaded from
+    	// external shared libraries
+    	"debug_ext" : true,
+    	"run_after_init": false,
+    	"close_views": false
+    }
 }
diff --git a/xs/MANIFEST b/xs/MANIFEST
index b838290c7..2fbd9f0ce 100644
--- a/xs/MANIFEST
+++ b/xs/MANIFEST
@@ -42,6 +42,8 @@ src/libslic3r/Fill/FillPlanePath.cpp
 src/libslic3r/Fill/FillPlanePath.hpp
 src/libslic3r/Fill/FillRectilinear.cpp
 src/libslic3r/Fill/FillRectilinear.hpp
+src/libslic3r/Fill/FillRectilinear2.cpp
+src/libslic3r/Fill/FillRectilinear2.hpp
 src/libslic3r/Flow.cpp
 src/libslic3r/Flow.hpp
 src/libslic3r/GCode.cpp
diff --git a/xs/src/libslic3r/Fill/FillBase.cpp b/xs/src/libslic3r/Fill/FillBase.cpp
index 07d6f38b9..c17f57185 100644
--- a/xs/src/libslic3r/Fill/FillBase.cpp
+++ b/xs/src/libslic3r/Fill/FillBase.cpp
@@ -6,6 +6,7 @@
 #include "Fill3DHoneycomb.hpp"
 #include "FillPlanePath.hpp"
 #include "FillRectilinear.hpp"
+#include "FillRectilinear2.hpp"
 
 namespace Slic3r {
 
@@ -18,7 +19,8 @@ Fill* Fill::new_from_type(const std::string &type)
 	if (type == "3dhoneycomb")
 		return new Fill3DHoneycomb();
 	if (type == "rectilinear")
-		return new FillRectilinear();
+//		return new FillRectilinear();
+        return new FillRectilinear2();
 	if (type == "line")
 		return new FillLine();
 	if (type == "grid")
diff --git a/xs/src/libslic3r/Fill/FillBase.hpp b/xs/src/libslic3r/Fill/FillBase.hpp
index 354d16535..8fa2bee42 100644
--- a/xs/src/libslic3r/Fill/FillBase.hpp
+++ b/xs/src/libslic3r/Fill/FillBase.hpp
@@ -12,6 +12,8 @@ class Surface;
 
 struct FillParams
 {
+    FillParams() { memset(this, 0, sizeof(FillParams)); }
+
     coordf_t    width;
     // Fraction in <0, 1>
     float       density;
diff --git a/xs/src/libslic3r/Fill/FillRectilinear.cpp b/xs/src/libslic3r/Fill/FillRectilinear.cpp
index 99b8b346f..e2f996e2a 100644
--- a/xs/src/libslic3r/Fill/FillRectilinear.cpp
+++ b/xs/src/libslic3r/Fill/FillRectilinear.cpp
@@ -34,7 +34,7 @@ Polylines FillRectilinear::fill_surface(const Surface *surface, const FillParams
             bounding_box.min.x - (bounding_box.min.x % this->_line_spacing),
             bounding_box.min.y - (bounding_box.min.y % this->_line_spacing)));
     }
-    
+
     // generate the basic pattern
     coord_t x_max = bounding_box.max.x + SCALED_EPSILON;
     Lines lines;
diff --git a/xs/src/libslic3r/TriangleMesh.cpp b/xs/src/libslic3r/TriangleMesh.cpp
index a5b89ba70..91e7982aa 100644
--- a/xs/src/libslic3r/TriangleMesh.cpp
+++ b/xs/src/libslic3r/TriangleMesh.cpp
@@ -13,7 +13,7 @@
 #include <assert.h>
 
 #ifdef SLIC3R_DEBUG
-#define SLIC3R_TRIANGLEMESH_DEBUG
+// #define SLIC3R_TRIANGLEMESH_DEBUG
 #include "SVG.hpp"
 #endif
 
diff --git a/xs/src/slic3r/GUI/GUI.cpp b/xs/src/slic3r/GUI/GUI.cpp
index fd5135f0a..eab1f6583 100644
--- a/xs/src/slic3r/GUI/GUI.cpp
+++ b/xs/src/slic3r/GUI/GUI.cpp
@@ -36,4 +36,19 @@ enable_screensaver()
     #endif
 }
 
+bool 
+debugged()
+{
+    return IsDebuggerPresent();
+}
+
+void
+break_to_debugger()
+{
+    #ifdef _WIN32
+    if (IsDebuggerPresent())
+        DebugBreak();
+    #endif /* _WIN32 */
+}
+
 } }
diff --git a/xs/src/slic3r/GUI/GUI.hpp b/xs/src/slic3r/GUI/GUI.hpp
index 3ce72fd61..85656c0a3 100644
--- a/xs/src/slic3r/GUI/GUI.hpp
+++ b/xs/src/slic3r/GUI/GUI.hpp
@@ -5,6 +5,8 @@ namespace Slic3r { namespace GUI {
 
 void disable_screensaver();
 void enable_screensaver();
+bool debugged();
+void break_to_debugger();
 
 } }
 
diff --git a/xs/xsp/GUI.xsp b/xs/xsp/GUI.xsp
index a422040e1..875c49e26 100644
--- a/xs/xsp/GUI.xsp
+++ b/xs/xsp/GUI.xsp
@@ -13,3 +13,9 @@ void disable_screensaver()
 
 void enable_screensaver()
     %code{% Slic3r::GUI::enable_screensaver(); %};
+
+bool debugged()
+    %code{% RETVAL=Slic3r::GUI::debugged(); %};
+
+void break_to_debugger()
+    %code{% Slic3r::GUI::break_to_debugger(); %};