Implement a Preferences option to set Draco position quantization bits

src/libslic3r/AppConfig.cpp

@@ -1,5 +1,6 @@
 #include "libslic3r/libslic3r.h"
 #include "libslic3r/Utils.hpp"
+#include "libslic3r/Format/DRC.hpp"
 #include "AppConfig.hpp"
 //BBS
 #include "Preset.hpp"
@@ -124,6 +125,8 @@ void AppConfig::set_defaults()
 #ifdef _WIN32
         if (get("associate_3mf").empty())
             set_bool("associate_3mf", false);
+        if (get("associate_drc").empty())
+            set_bool("associate_drc", false);
         if (get("associate_stl").empty())
             set_bool("associate_stl", false);
         if (get("associate_step").empty())
@@ -234,6 +237,9 @@ void AppConfig::set_defaults()
     if (get("enable_multi_machine").empty())
         set_bool("enable_multi_machine", false);
 
+    if (get("drc_bits").empty())
+        set("drc_bits", DRC_BITS_DEFAULT_STR);
+
     if (get("show_gcode_window").empty())
         set_bool("show_gcode_window", true);
 

src/libslic3r/Format/DRC.hpp

@@ -3,6 +3,11 @@
 
 namespace Slic3r {
 
+#define DRC_BITS_MIN 0
+#define DRC_BITS_MAX 30
+#define DRC_BITS_DEFAULT 16
+#define DRC_BITS_DEFAULT_STR "16"
+
 class TriangleMesh;
 class ModelObject;
 class Model;

src/slic3r/GUI/Plater.cpp

@@ -14877,8 +14877,15 @@ void Plater::export_drc(bool extended, bool selection_only, bool multi_drcs)
     if (p->model.objects.empty()) { return; }
 
     wxString path;
-    int bits = 16;
+    int bits = 0;
     int speed = 0;
+
+    AppConfig* app_config = wxGetApp().app_config;
+    if (app_config) bits = stoi(app_config->get("drc_bits"));
+
+    if (bits < DRC_BITS_MIN) bits = DRC_BITS_MIN;
+    if (bits > DRC_BITS_MAX) bits = DRC_BITS_MAX;
+
     if (multi_drcs) {
         wxDirDialog dlg(this, _L("Choose a directory"), from_u8(wxGetApp().app_config->get_last_dir()),
                         wxDD_DEFAULT_STYLE | wxDD_DIR_MUST_EXIST);

src/slic3r/GUI/Preferences.cpp

@@ -6,6 +6,7 @@
 #include "MsgDialog.hpp"
 #include "I18N.hpp"
 #include "libslic3r/AppConfig.hpp"
+#include "libslic3r/Format/DRC.hpp"
 #include <wx/language.h>
 #include "OG_CustomCtrl.hpp"
 #include "wx/graphics.h"
@@ -1314,6 +1315,16 @@ void PreferencesDialog::create_items()
     g_sizer->Add(item_pop_up_filament_map_dialog);
 #endif
 
+    auto item_draco_position_bits = create_item_input(_L("Draco quantization bits\n(Note: Affects dimensional accuracy)"), _L("(0 for no quantization)"), _L("More bits results in better quality and dimensional accuracy but larger file size.\n0 disables quantization, producing a nearly lossless file. ~16 bits is visually lossless but can introduce small dimensional errors over longer distances."), "drc_bits", [=](wxString value) {
+            long drcBits = DRC_BITS_DEFAULT;
+            if (value.ToLong(&drcBits)) {
+                if (drcBits < DRC_BITS_MIN) drcBits = DRC_BITS_MIN;
+                if (drcBits > DRC_BITS_MAX) drcBits = DRC_BITS_MAX;
+                app_config->set("drc_bits", std::to_string(drcBits));
+            }
+    });
+    g_sizer->Add(item_draco_position_bits);
+
     g_sizer->AddSpacer(FromDIP(10));
     sizer_page->Add(g_sizer, 0, wxEXPAND);