Added Aligned Monotonic infill for improving surface finish and clarity of clear parts

src/libslic3r/Fill/FillBase.cpp

@@ -39,6 +39,7 @@ Fill* Fill::new_from_type(const InfillPattern type)
     case ipAlignedRectilinear:  return new FillAlignedRectilinear();
     case ipMonotonic:           return new FillMonotonic();
     case ipMonotonicLines:      return new FillMonotonicLines();
+    case ipAlignedMonotonic:    return new FillAlignedMonotonic();
     case ipLine:                return new FillLine();
     case ipGrid:                return new FillGrid();
     case ipTriangles:           return new FillTriangles();

src/libslic3r/Fill/FillRectilinear.cpp

@@ -2974,6 +2974,16 @@ Polylines FillMonotonic::fill_surface(const Surface *surface, const FillParams &
     return polylines_out;
 }
 
+Polylines FillAlignedMonotonic::fill_surface(const Surface *surface, const FillParams &params)
+{
+    FillParams params2 = params;
+    params2.monotonic = true;
+    Polylines polylines_out;
+    if (! fill_surface_by_lines(surface, params2, 0.f, 0.f, polylines_out))
+        BOOST_LOG_TRIVIAL(error) << "FillAlignedMonotonic::fill_surface() failed to fill a region.";
+    return polylines_out;
+}
+
 Polylines FillMonotonicLines::fill_surface(const Surface *surface, const FillParams &params)
 {
     FillParams params2 = params;

src/libslic3r/Fill/FillRectilinear.hpp

@@ -59,6 +59,19 @@ class FillMonotonicLines : public FillRectilinear
     bool no_sort() const override { return true; }
 };
 
+class FillAlignedMonotonic : public FillRectilinear 
+{
+public:
+    Fill* clone() const override { return new FillAlignedMonotonic(*this); }
+    ~FillAlignedMonotonic() override = default;
+    Polylines fill_surface(const Surface *surface, const FillParams &params) override;
+	bool no_sort() const override { return true; }
+
+protected:
+    // Always generate infill at the same angle.
+    virtual float _layer_angle(size_t idx) const override { return 0.f; }
+};
+
 class FillGrid : public FillRectilinear
 {
 public:

src/libslic3r/PrintConfig.cpp

@@ -95,6 +95,7 @@ static const t_config_enum_values s_keys_map_InfillPattern {
     { "monotonic",          ipMonotonic },
     { "monotoniclines",     ipMonotonicLines },
     { "alignedrectilinear", ipAlignedRectilinear },
+    { "alignedmonotonic",   ipAlignedMonotonic },
     { "grid",               ipGrid },
     { "triangles",          ipTriangles },
     { "stars",              ipStars },
@@ -814,6 +815,7 @@ void PrintConfigDef::init_fff_params()
         { "monotonic",          L("Monotonic") },
         { "monotoniclines",     L("Monotonic Lines") },
         { "alignedrectilinear", L("Aligned Rectilinear") },
+        { "alignedmonotonic",   L("Aligned Monotonic") },
         { "concentric",         L("Concentric") },
         { "hilbertcurve",       L("Hilbert Curve") },
         { "archimedeanchords",  L("Archimedean Chords") },
@@ -1225,6 +1227,8 @@ void PrintConfigDef::init_fff_params()
     def->set_enum<InfillPattern>({
         { "rectilinear",        L("Rectilinear") },
         { "alignedrectilinear", L("Aligned Rectilinear") },
+        { "monotonic",          L("Monotonic") },
+        { "alignedmonotonic",   L("Aligned Monotonic") },
         { "grid",               L("Grid") }, 
         { "triangles",          L("Triangles")},
         { "stars",              L("Stars")},

src/libslic3r/PrintConfig.hpp

@@ -58,9 +58,9 @@ enum class FuzzySkinType {
 };
 
 enum InfillPattern : int {
-    ipRectilinear, ipMonotonic, ipMonotonicLines, ipAlignedRectilinear, ipGrid, ipTriangles, ipStars, ipCubic, ipLine, ipConcentric, ipHoneycomb, ip3DHoneycomb,
-    ipGyroid, ipHilbertCurve, ipArchimedeanChords, ipOctagramSpiral, ipAdaptiveCubic, ipSupportCubic, ipSupportBase,
-    ipLightning,
+    ipRectilinear, ipMonotonic, ipMonotonicLines, ipAlignedRectilinear, ipAlignedMonotonic, ipGrid, ipTriangles, ipStars, ipCubic, ipLine, 
+    ipConcentric, ipHoneycomb, ip3DHoneycomb, ipGyroid, ipHilbertCurve, ipArchimedeanChords, ipOctagramSpiral, ipAdaptiveCubic, ipSupportCubic, 
+    ipSupportBase,ipLightning,
     ipEnsuring,
     ipCount,
 };