Split the external infill pattern to separate top / bottom config values.

Based on f9344a00e3
thanks @supermerill
Implements  #475, #479, #1133, #1474

src/libslic3r/Fill/Fill.cpp

@@ -69,7 +69,9 @@ void make_fill(LayerRegion &layerm, ExtrusionEntityCollection &out)
                 if (surface.is_solid() && (!surface.is_bridge() || layerm.layer()->id() == 0)) {
                     group_attrib[i].is_solid = true;
                     group_attrib[i].flow_width = (surface.surface_type == stTop) ? top_solid_infill_flow.width : solid_infill_flow.width;
-                    group_attrib[i].pattern = surface.is_external() ? layerm.region()->config().external_fill_pattern.value : ipRectilinear;
+                    group_attrib[i].pattern = surface.is_external() ? 
+						(surface.is_top() ? layerm.region()->config().top_fill_pattern.value : layerm.region()->config().bottom_fill_pattern.value) :
+                        ipRectilinear;
                 }
             }
             // Loop through solid groups, find compatible groups and append them to this one.
@@ -161,7 +163,7 @@ void make_fill(LayerRegion &layerm, ExtrusionEntityCollection &out)
         if (surface.is_solid()) {
             density = 100.;
             fill_pattern = (surface.is_external() && ! is_bridge) ? 
-                layerm.region()->config().external_fill_pattern.value :
+				(surface.is_top() ? layerm.region()->config().top_fill_pattern.value : layerm.region()->config().bottom_fill_pattern.value) :
                 ipRectilinear;
         } else if (density <= 0)
             continue;

src/libslic3r/PrintConfig.cpp

@@ -362,12 +362,11 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->default_value = new ConfigOptionBool(false);
 
-    def = this->add("external_fill_pattern", coEnum);
-    def->label = L("Top/bottom fill pattern");
+    auto def_top_fill_pattern = def = this->add("top_fill_pattern", coEnum);
+    def->label = L("Top fill pattern");
     def->category = L("Infill");
-    def->tooltip = L("Fill pattern for top/bottom infill. This only affects the external visible layer, "
-                   "and not its adjacent solid shells.");
-    def->cli = "external-fill-pattern|solid-fill-pattern=s";
+    def->tooltip = L("Fill pattern for top infill. This only affects the top visible layer, and not its adjacent solid shells.");
+    def->cli = "top-fill-pattern|external-fill-pattern|solid-fill-pattern=s";
     def->enum_keys_map = &ConfigOptionEnum<InfillPattern>::get_enum_values();
     def->enum_values.push_back("rectilinear");
     def->enum_values.push_back("concentric");
@@ -379,8 +378,15 @@ void PrintConfigDef::init_fff_params()
     def->enum_labels.push_back(L("Hilbert Curve"));
     def->enum_labels.push_back(L("Archimedean Chords"));
     def->enum_labels.push_back(L("Octagram Spiral"));
-    // solid_fill_pattern is an obsolete equivalent to external_fill_pattern.
-    def->aliases = { "solid_fill_pattern" };
+    // solid_fill_pattern is an obsolete equivalent to top_fill_pattern/bottom_fill_pattern.
+    def->aliases = { "solid_fill_pattern", "external_fill_pattern" };
+    def->default_value = new ConfigOptionEnum<InfillPattern>(ipRectilinear);
+
+    def = this->add("bottom_fill_pattern", coEnum);
+    *def = *def_top_fill_pattern;
+    def->label = L("Bottom Pattern");
+    def->tooltip = L("Fill pattern for bottom infill. This only affects the bottom external visible layer, and not its adjacent solid shells.");
+    def->cli = "bottom-fill-pattern|external-fill-pattern|solid-fill-pattern=s";
     def->default_value = new ConfigOptionEnum<InfillPattern>(ipRectilinear);
 
     def = this->add("external_perimeter_extrusion_width", coFloatOrPercent);
@@ -2939,13 +2945,17 @@ std::string FullPrintConfig::validate()
     if (! print_config_def.get("fill_pattern")->has_enum_value(this->fill_pattern.serialize()))
         return "Invalid value for --fill-pattern";
     
-    // --external-fill-pattern
-    if (! print_config_def.get("external_fill_pattern")->has_enum_value(this->external_fill_pattern.serialize()))
-        return "Invalid value for --external-fill-pattern";
+    // --top-fill-pattern
+    if (! print_config_def.get("top_fill_pattern")->has_enum_value(this->top_fill_pattern.serialize()))
+        return "Invalid value for --top-fill-pattern";
+
+    // --bottom-fill-pattern
+    if (! print_config_def.get("bottom_fill_pattern")->has_enum_value(this->bottom_fill_pattern.serialize()))
+        return "Invalid value for --bottom-fill-pattern";
 
     // --fill-density
     if (fabs(this->fill_density.value - 100.) < EPSILON &&
-        ! print_config_def.get("external_fill_pattern")->has_enum_value(this->fill_pattern.serialize()))
+        ! print_config_def.get("top_fill_pattern")->has_enum_value(this->fill_pattern.serialize()))
         return "The selected fill pattern is not supposed to work at 100% density";
     
     // --infill-every-layers

src/libslic3r/PrintConfig.hpp

@@ -462,7 +462,8 @@ public:
     ConfigOptionFloat               bridge_flow_ratio;
     ConfigOptionFloat               bridge_speed;
     ConfigOptionBool                ensure_vertical_shell_thickness;
-    ConfigOptionEnum<InfillPattern> external_fill_pattern;
+    ConfigOptionEnum<InfillPattern> top_fill_pattern;
+    ConfigOptionEnum<InfillPattern> bottom_fill_pattern;
     ConfigOptionFloatOrPercent      external_perimeter_extrusion_width;
     ConfigOptionFloatOrPercent      external_perimeter_speed;
     ConfigOptionBool                external_perimeters_first;
@@ -504,7 +505,8 @@ protected:
         OPT_PTR(bridge_flow_ratio);
         OPT_PTR(bridge_speed);
         OPT_PTR(ensure_vertical_shell_thickness);
-        OPT_PTR(external_fill_pattern);
+        OPT_PTR(top_fill_pattern);
+        OPT_PTR(bottom_fill_pattern);
         OPT_PTR(external_perimeter_extrusion_width);
         OPT_PTR(external_perimeter_speed);
         OPT_PTR(external_perimeters_first);

src/libslic3r/PrintObject.cpp

@@ -498,7 +498,8 @@ bool PrintObject::invalidate_state_by_config_options(const std::vector<t_config_
             || opt_key == "bridge_angle") {
             steps.emplace_back(posPrepareInfill);
         } else if (
-               opt_key == "external_fill_pattern"
+               opt_key == "top_fill_pattern"
+            || opt_key == "bottom_fill_pattern"
             || opt_key == "external_fill_link_max_length"
             || opt_key == "fill_angle"
             || opt_key == "fill_pattern"

src/libslic3r/Surface.cpp

@@ -42,6 +42,12 @@ Surface::is_internal() const
         || this->surface_type == stInternalVoid;
 }
 
+bool
+Surface::is_top() const
+{
+    return this->surface_type == stTop;
+}
+
 bool
 Surface::is_bottom() const
 {

src/libslic3r/Surface.hpp

@@ -98,6 +98,7 @@ public:
     bool is_solid() const;
     bool is_external() const;
     bool is_internal() const;
+    bool is_top() const;
     bool is_bottom() const;
     bool is_bridge() const;
 };