Seam: use scarf joint to minimize seam visiblity (#3839)

* Remember z of previous layer

* Support travel to middle of the layer z

* Support sloped extrusion

* Implement sloped seam

* Reduce extra movements

* Don't clip loop if sloped seam is enabled

* Fix wipe

* Ensure `slope_max_segment_length`

* Add options

* Limit slope length to perimeter length

* Fix slope segmentation

* Rename the option to scarf joint seam

* Don't modify the slope option when turning on spiral vase

* Add a few suggestions when turnning on scarf joint

* Add option to add scarf joint to inner walls

* Apply seam gap at the end of the slope

* Add option to explicitly use the entire loop as scarf length

* Fix layer number

* Increase default scarf length to 20mm

* Better way of storing the global scarf state

* Better vase mode layer height recognition

* Move id should exclude seams

* Fix slope height with independent support layer height

* Fix linux build

* Allow controlling the scarf with modifier

* Scarf start height default to 0

* Allow enable scarf seam on contour only

* Fix type error

* Move the creation of sloped loop into ExtrusionEntity.cpp

* Fix error "vector too long"

* Detect seams properly

* The correct way of calculating the rate limit

* The correct way of calculating the rate limit

(cherry picked from commit 05961f7c98803a42871b8df855bfff6a102936c4)

* Add pressure equalizer in print by object mode

* Remove the settings recommendation as it varies a lot depends on printer & filament

* Add a beta suffix

---------

Co-authored-by: SoftFever <softfeverever@gmail.com>

src/libslic3r/PrintConfig.cpp

@@ -264,6 +264,14 @@ static t_config_enum_values s_keys_map_SeamPosition {
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(SeamPosition)
 
+// Orca
+static t_config_enum_values s_keys_map_SeamScarfType{
+    { "none",           int(SeamScarfType::None) },
+    { "external",       int(SeamScarfType::External) },
+    { "all",            int(SeamScarfType::All) },
+};
+CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(SeamScarfType)
+
 // Orca
 static t_config_enum_values s_keys_map_InternalBridgeFilter {
     { "disabled",        ibfDisabled },
@@ -2795,6 +2803,10 @@ def = this->add("filament_loading_speed", coFloats);
     def->height = 15;
     def->set_default_value(new ConfigOptionStrings{"0,0", "\n0.2,0.4444", "\n0.4,0.6145", "\n0.6,0.7059", "\n0.8,0.7619", "\n1.5,0.8571", "\n2,0.8889", "\n3,0.9231", "\n5,0.9520", "\n10,1"});
 
+    def = this->add("has_scarf_joint_seam", coBool);
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionBool(false));
+
     {
         struct AxisDefault {
             std::string         name;
@@ -3523,6 +3535,55 @@ def = this->add("filament_loading_speed", coFloats);
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionFloatOrPercent(10,true));
 
+    def = this->add("seam_slope_type", coEnum);
+    def->label = L("Scarf joint seam (beta)");
+    def->tooltip = L("Use scarf joint to minimize seam visibility and increase seam strength.");
+    def->enum_keys_map = &ConfigOptionEnum<SeamScarfType>::get_enum_values();
+    def->enum_values.push_back("none");
+    def->enum_values.push_back("external");
+    def->enum_values.push_back("all");
+    def->enum_labels.push_back(L("None"));
+    def->enum_labels.push_back(L("Contour"));
+    def->enum_labels.push_back(L("Contour and hole"));
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionEnum<SeamScarfType>(SeamScarfType::None));
+    
+    def = this->add("seam_slope_start_height", coFloatOrPercent);
+    def->label = L("Scarf start height");
+    def->tooltip = L("Start height of the scarf.\n"
+                     "This amount can be specified in millimeters or as a percentage of the current layer height. The default value for this parameter is 0.");
+    def->sidetext = L("mm or %");
+    def->min = 0;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionFloatOrPercent(0, false));
+
+    def = this->add("seam_slope_entire_loop", coBool);
+    def->label = L("Scarf around entire wall");
+    def->tooltip = L("The scarf extends to the entire length of the wall.");
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionBool(false));
+
+    def = this->add("seam_slope_min_length", coFloat);
+    def->label = L("Scarf length");
+    def->tooltip = L("Length of the scarf. Setting this parameter to zero effectively disables the scarf.");
+    def->sidetext = L("mm");
+    def->min = 0;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionFloat(20));
+
+    def = this->add("seam_slope_steps", coInt);
+    def->label = L("Scarf steps");
+    def->tooltip = L("Minimum number of segments of each scarf.");
+    def->min = 1;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionInt(10));
+
+    def = this->add("seam_slope_inner_walls", coBool);
+    def->label = L("Scarf joint for inner walls");
+    def->tooltip = L("Use scarf joint for inner walls as well.");
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionBool(false));
+
     def = this->add("role_based_wipe_speed", coBool);
     def->label = L("Role base wipe speed");
     def->tooltip = L("The wipe speed is determined by the speed of the current extrusion role."