Initial Draco write support.

Currently always exports with 16-bit precision and speed 0 (best compression).
The back-end function does have arguments to specify them, it's just not hooked into the GUI.

src/libslic3r/Format/DRC.cpp

@@ -4,6 +4,7 @@
 
 #include <boost/iostreams/device/mapped_file.hpp>
 
+#include <draco/compression/encode.h>
 #include <draco/compression/decode.h>
 #include <draco/io/mesh_io.h>
 #include <draco/mesh/mesh.h>
@@ -96,22 +97,69 @@ bool load_drc(const char *path, Model *model, const char *object_name_in)
     return ret;
 }
 
-bool store_drc(const char *path, TriangleMesh *mesh, bool binary)
+bool store_drc(const char *path, TriangleMesh *mesh, int bits, int speed)
 {
-    // TODO
-    return false;
+    try {
+        const std::vector<stl_triangle_vertex_indices>* indices = &(mesh->its.indices);
+        const std::vector<stl_vertex>* vertices = &(mesh->its.vertices);
+        
+        Mesh dracoMesh;
+
+        dracoMesh.set_num_points(vertices->size());
+        
+        GeometryAttribute gaPos;
+        gaPos.Init(GeometryAttribute::POSITION, nullptr, 3, DT_FLOAT32, false, sizeof(float)*3, 0);
+        int32_t idPos = dracoMesh.AddAttribute(gaPos, true, indices->size() * 3);
+        
+        dracoMesh.attribute(idPos)->Resize(vertices->size());
+        
+        for (size_t i = 0; i < vertices->size(); ++ i) {
+            float vertex[3];
+            vertex[0] = vertices->at(i)(0);
+            vertex[1] = vertices->at(i)(1);
+            vertex[2] = vertices->at(i)(2);
+            dracoMesh.attribute(idPos)->SetAttributeValue(AttributeValueIndex(i), vertex);
+        }
+        
+        dracoMesh.SetNumFaces(indices->size());
+        for (size_t i = 0; i < indices->size(); ++ i) {
+            Mesh::Face face;
+            face[0] = PointIndex(indices->at(i)[0]);
+            face[1] = PointIndex(indices->at(i)[1]);
+            face[2] = PointIndex(indices->at(i)[2]);
+            dracoMesh.SetFace(FaceIndex(i), face);
+        }
+        
+        Encoder encoder;
+        encoder.SetSpeedOptions(speed, speed);
+        encoder.SetAttributeQuantization(GeometryAttribute::POSITION, bits);
+        
+        EncoderBuffer buffer;
+        encoder.EncodeMeshToBuffer(dracoMesh, &buffer);
+        
+        FILE* fp = boost::nowide::fopen(path, "wb");
+        if (!fp) return false;
+        size_t written = fwrite(buffer.data(), 1, buffer.size(), fp);
+        fclose(fp);
+        
+        if (written != buffer.size()) return false;
+    } catch (const std::exception& e) {
+        BOOST_LOG_TRIVIAL(error) << "store_drc: " << e.what();
+        return false;
+    }
+    return true;
 }
 
-bool store_drc(const char *path, ModelObject *model_object, bool binary)
+bool store_drc(const char *path, ModelObject *model_object, int bits, int speed)
 {
     TriangleMesh mesh = model_object->mesh();
-    return store_drc(path, &mesh, binary);
+    return store_drc(path, &mesh, bits, speed);
 }
 
-bool store_drc(const char *path, Model *model, bool binary)
+bool store_drc(const char *path, Model *model, int bits, int speed)
 {
     TriangleMesh mesh = model->mesh();
-    return store_drc(path, &mesh, binary);
+    return store_drc(path, &mesh, bits, speed);
 }
 
 }; // namespace Slic3r

src/libslic3r/Format/DRC.hpp

@@ -11,9 +11,9 @@ class Model;
 extern bool load_drc(const char *path, TriangleMesh *meshptr);
 extern bool load_drc(const char *path, Model *model, const char *object_name = nullptr);
 
-extern bool store_drc(const char *path, TriangleMesh *mesh, bool binary);
-extern bool store_drc(const char *path, ModelObject *model_object, bool binary);
-extern bool store_drc(const char *path, Model *model, bool binary);
+extern bool store_drc(const char *path, TriangleMesh *mesh, int bits, int speed);
+extern bool store_drc(const char *path, ModelObject *model_object, int bits, int speed);
+extern bool store_drc(const char *path, Model *model, int bits, int speed);
 
 }; // namespace Slic3r
 

src/slic3r/GUI/GUI_App.cpp

@@ -529,6 +529,7 @@ static const FileWildcards file_wildcards_by_type[FT_SIZE] = {
     /* FT_SVG */     { "SVG files"sv,       { ".svg"sv } },
     /* FT_TEX */     { "Texture"sv,         { ".png"sv, ".svg"sv } },
     /* FT_SL1 */     { "Masked SLA files"sv, { ".sl1"sv, ".sl1s"sv } },
+    /* FT_DRC */     { "Draco files"sv,     { ".drc"sv } },
 };
 
 // This function produces a Win32 file dialog file template mask to be consumed by wxWidgets on all platforms.

src/slic3r/GUI/GUI_App.hpp

@@ -105,6 +105,8 @@ enum FileType
 
     FT_SL1,
 
+    FT_DRC,
+
     FT_SIZE,
 };
 

src/slic3r/GUI/GUI_Factories.cpp

@@ -855,6 +855,27 @@ void MenuFactory::append_menu_item_export_stl(wxMenu* menu, bool is_mulity_menu)
         }, m_parent);
 }
 
+void MenuFactory::append_menu_item_export_drc(wxMenu* menu, bool is_mulity_menu)
+{
+    append_menu_item(menu, wxID_ANY, _L("Export as one DRC") + dots, "",
+        [](wxCommandEvent&) { plater()->export_drc(false, true); }, "", nullptr,
+        [is_mulity_menu]() {
+            const Selection& selection = plater()->canvas3D()->get_selection();
+            if (is_mulity_menu)
+                return selection.is_multiple_full_instance() || selection.is_multiple_full_object();
+            else
+                return selection.is_single_full_instance() || selection.is_single_full_object();
+        }, m_parent);
+    if (!is_mulity_menu)
+        return;
+    append_menu_item(menu, wxID_ANY, _L("Export as DRCs") + dots, "",
+        [](wxCommandEvent&) { plater()->export_drc(false, true, true); }, "", nullptr,
+        []() {
+            const Selection& selection = plater()->canvas3D()->get_selection();
+            return selection.is_multiple_full_instance() || selection.is_multiple_full_object();
+        }, m_parent);
+}
+
 void MenuFactory::append_menu_item_reload_from_disk(wxMenu* menu)
 {
     append_menu_item(menu, wxID_ANY, _L("Reload from disk"), _L("Reload the selected parts from disk"),
@@ -1269,6 +1290,7 @@ void MenuFactory::create_common_object_menu(wxMenu* menu)
     // BBS
     append_menu_item_reload_from_disk(menu);
     append_menu_item_export_stl(menu);
+    append_menu_item_export_drc(menu);
     // "Scale to print volume" makes a sense just for whole object
     append_menu_item_scale_selection_to_fit_print_volume(menu);
 
@@ -1348,6 +1370,7 @@ void MenuFactory::create_extra_object_menu()
     append_menu_item_reload_from_disk(&m_object_menu);
     append_menu_item_replace_with_stl(&m_object_menu);
     append_menu_item_export_stl(&m_object_menu);
+    append_menu_item_export_drc(&m_object_menu);
 }
 
 void MenuFactory::create_bbl_assemble_object_menu()
@@ -1382,6 +1405,7 @@ void MenuFactory::create_part_menu()
     append_menu_item_delete(menu);
     append_menu_item_reload_from_disk(menu);
     append_menu_item_export_stl(menu);
+    append_menu_item_export_drc(menu);
     append_menu_item_fix_through_netfabb(menu);
     append_menu_items_mirror(menu);
     append_menu_item_merge_parts_to_single_part(menu);
@@ -1697,6 +1721,7 @@ wxMenu* MenuFactory::multi_selection_menu()
         append_menu_item_change_filament(menu);
         menu->AppendSeparator();
         append_menu_item_export_stl(menu, true);
+        append_menu_item_export_drc(menu, true);
     }
     else {
         append_menu_item_center(menu);

src/slic3r/GUI/GUI_Factories.hpp

@@ -135,6 +135,7 @@ private:
     wxMenuItem* append_menu_item_fix_through_netfabb(wxMenu* menu);
     //wxMenuItem* append_menu_item_simplify(wxMenu* menu);
     void        append_menu_item_export_stl(wxMenu* menu, bool is_mulity_menu = false);
+    void        append_menu_item_export_drc(wxMenu* menu, bool is_mulity_menu = false);
     void        append_menu_item_reload_from_disk(wxMenu* menu);
     void        append_menu_item_replace_with_stl(wxMenu* menu);
     void        append_menu_item_change_extruder(wxMenu* menu);

src/slic3r/GUI/MainFrame.cpp

@@ -2403,6 +2403,12 @@ void MainFrame::init_menubar_as_editor()
         append_menu_item(export_menu, wxID_ANY, _L("Export all objects as STLs") + dots, _L("Export all objects as STLs"),
             [this](wxCommandEvent&) { if (m_plater) m_plater->export_stl(false, false, true); }, "menu_export_stl", nullptr,
             [this](){return can_export_model(); }, this);
+        append_menu_item(export_menu, wxID_ANY, _L("Export all objects as one DRC") + dots, _L("Export all objects as one DRC"),
+            [this](wxCommandEvent&) { if (m_plater) m_plater->export_drc(); }, "menu_export_stl", nullptr,
+            [this](){return can_export_model(); }, this);
+        append_menu_item(export_menu, wxID_ANY, _L("Export all objects as DRCs") + dots, _L("Export all objects as DRCs"),
+            [this](wxCommandEvent&) { if (m_plater) m_plater->export_drc(false, false, true); }, "menu_export_stl", nullptr,
+            [this](){return can_export_model(); }, this);
         append_menu_item(export_menu, wxID_ANY, _L("Export Generic 3MF") + dots/* + "\tCtrl+G"*/, _L("Export 3mf file without using some 3mf-extensions"),
             [this](wxCommandEvent&) { if (m_plater) m_plater->export_core_3mf(); }, "menu_export_sliced_file", nullptr,
             [this](){return can_export_model(); }, this);

src/slic3r/GUI/Plater.cpp

@@ -47,6 +47,7 @@
 
 #include "libslic3r/libslic3r.h"
 #include "libslic3r/Format/STL.hpp"
+#include "libslic3r/Format/DRC.hpp"
 #include "libslic3r/Format/STEP.hpp"
 #include "libslic3r/Format/AMF.hpp"
 //#include "libslic3r/Format/3mf.hpp"
@@ -4766,6 +4767,7 @@ wxString Plater::priv::get_export_file(GUI::FileType file_type)
     wxString wildcard;
     switch (file_type) {
         case FT_STL:
+        case FT_DRC:
         case FT_AMF:
         case FT_3MF:
         case FT_GCODE:
@@ -4787,6 +4789,12 @@ wxString Plater::priv::get_export_file(GUI::FileType file_type)
             dlg_title = _L("Export STL file:");
             break;
         }
+        case FT_DRC:
+        {
+            output_file.replace_extension("drc");
+            dlg_title = _L("Export Draco file:");
+            break;
+        }
         case FT_AMF:
         {
             // XXX: Problem on OS X with double extension?
@@ -12135,6 +12143,225 @@ void Plater::export_stl(bool extended, bool selection_only, bool multi_stls)
     }
 }*/
 
+void Plater::export_drc(bool extended, bool selection_only, bool multi_drcs)
+{
+    if (p->model.objects.empty()) { return; }
+
+    wxString path;
+    int bits = 16;
+    int speed = 0;
+    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);
+        if (dlg.ShowModal() == wxID_OK) {
+            path = dlg.GetPath() + "/";
+        }
+    } else {
+        path = p->get_export_file(FT_DRC);
+    }
+    if (path.empty()) { return; }
+    const std::string path_u8 = into_u8(path);
+
+    wxBusyCursor wait;
+    const auto& selection = p->get_selection();
+    const auto obj_idx = selection.get_object_idx();
+
+#if EXPORT_WITH_BOOLEAN
+    if (selection_only && (obj_idx == -1 || selection.is_wipe_tower()))
+        return;
+#else
+    // BBS support selecting multiple objects
+    if (selection_only && selection.is_wipe_tower()) return;
+
+    // BBS
+    if (selection_only) {
+        // only support selection single full object and mulitiple full object
+        if (!selection.is_single_full_object() && !selection.is_multiple_full_object()) return;
+    }
+
+    // Following lambda generates a combined mesh for export with normals pointing outwards.
+    auto mesh_to_export_fff_no_boolean = [this](const ModelObject &mo, int instance_id) {
+        TriangleMesh mesh;
+
+        //Prusa export negative parts
+        std::vector<csg::CSGPart> csgmesh;
+        csgmesh.reserve(2 * mo.volumes.size());
+        csg::model_to_csgmesh(mo, Transform3d::Identity(), std::back_inserter(csgmesh),
+                              csg::mpartsPositive | csg::mpartsNegative | csg::mpartsDoSplits);
+
+        auto csgrange = range(csgmesh);
+        if (csg::is_all_positive(csgrange)) {
+            mesh = TriangleMesh{csg::csgmesh_merge_positive_parts(csgrange)};
+        } else if (std::get<2>(csg::check_csgmesh_booleans(csgrange)) == csgrange.end()) {
+            try {
+                auto cgalm = csg::perform_csgmesh_booleans(csgrange);
+                mesh = MeshBoolean::cgal::cgal_to_triangle_mesh(*cgalm);
+            } catch (...) {}
+        }
+
+        if (mesh.empty()) {
+            get_notification_manager()->push_plater_error_notification(
+                _u8L("Unable to perform boolean operation on model meshes. "
+                     "Only positive parts will be exported."));
+
+            for (const ModelVolume* v : mo.volumes)
+                if (v->is_model_part()) {
+                    TriangleMesh vol_mesh(v->mesh());
+                    vol_mesh.transform(v->get_matrix(), true);
+                    mesh.merge(vol_mesh);
+                }
+        }
+        if (instance_id == -1) {
+            TriangleMesh vols_mesh(mesh);
+            mesh = TriangleMesh();
+            for (const ModelInstance *i : mo.instances) {
+                TriangleMesh m = vols_mesh;
+                m.transform(i->get_matrix(), true);
+                mesh.merge(m);
+            }
+        } else if (0 <= instance_id && instance_id < int(mo.instances.size()))
+            mesh.transform(mo.instances[instance_id]->get_matrix(), true);
+        return mesh;
+    };
+#endif
+    auto mesh_to_export_sla = [&, this](const ModelObject& mo, int instance_id) {
+        TriangleMesh mesh;
+
+        const SLAPrintObject *object = this->p->sla_print.get_print_object_by_model_object_id(mo.id());
+
+        if (auto m = object->get_mesh_to_print(); m.empty())
+            mesh = combine_mesh_fff(mo, instance_id, [this](const std::string& msg) {return get_notification_manager()->push_plater_error_notification(msg); });
+        else {
+            const Transform3d mesh_trafo_inv = object->trafo().inverse();
+            const bool is_left_handed = object->is_left_handed();
+
+            auto pad_mesh = extended? object->pad_mesh() : TriangleMesh{};
+            pad_mesh.transform(mesh_trafo_inv);
+
+            auto supports_mesh = extended ? object->support_mesh() : TriangleMesh{};
+            supports_mesh.transform(mesh_trafo_inv);
+
+            const std::vector<SLAPrintObject::Instance>& obj_instances = object->instances();
+            for (const SLAPrintObject::Instance& obj_instance : obj_instances) {
+                auto it = std::find_if(object->model_object()->instances.begin(), object->model_object()->instances.end(),
+                                       [&obj_instance](const ModelInstance *mi) { return mi->id() == obj_instance.instance_id; });
+                assert(it != object->model_object()->instances.end());
+
+                if (it != object->model_object()->instances.end()) {
+                    const bool one_inst_only = selection_only && ! selection.is_single_full_object();
+
+                    const int instance_idx = it - object->model_object()->instances.begin();
+                    const Transform3d& inst_transform = one_inst_only
+                                                            ? Transform3d::Identity()
+                                                            : object->model_object()->instances[instance_idx]->get_transformation().get_matrix();
+
+                    TriangleMesh inst_mesh;
+
+                    if (!pad_mesh.empty()) {
+                        TriangleMesh inst_pad_mesh = pad_mesh;
+                        inst_pad_mesh.transform(inst_transform, is_left_handed);
+                        inst_mesh.merge(inst_pad_mesh);
+                    }
+
+                    if (!supports_mesh.empty()) {
+                        TriangleMesh inst_supports_mesh = supports_mesh;
+                        inst_supports_mesh.transform(inst_transform, is_left_handed);
+                        inst_mesh.merge(inst_supports_mesh);
+                    }
+
+                    TriangleMesh inst_object_mesh = object->get_mesh_to_print();
+
+                    inst_object_mesh.transform(mesh_trafo_inv);
+                    inst_object_mesh.transform(inst_transform, is_left_handed);
+
+                    inst_mesh.merge(inst_object_mesh);
+
+                           // ensure that the instance lays on the bed
+                    inst_mesh.translate(0.0f, 0.0f, -inst_mesh.bounding_box().min.z());
+
+                           // merge instance with global mesh
+                    mesh.merge(inst_mesh);
+
+                    if (one_inst_only)
+                        break;
+                }
+            }
+        }
+
+        return mesh;
+    };
+
+    std::function<TriangleMesh(const ModelObject& mo, int instance_id)>
+        mesh_to_export;
+
+    if (p->printer_technology == ptFFF)
+#if EXPORT_WITH_BOOLEAN
+        mesh_to_export = [this](const ModelObject& mo, int instance_id) {return Plater::combine_mesh_fff(mo, instance_id,
+            [this](const std::string& msg) {return get_notification_manager()->push_plater_error_notification(msg); }); };
+#else
+        mesh_to_export = mesh_to_export_fff_no_boolean;
+#endif
+    else
+        mesh_to_export = mesh_to_export_sla;
+
+    auto get_save_file = [](std::string const & dir, std::string const & name) {
+        auto path = dir + name + ".drc";
+        int n = 1;
+        while (boost::filesystem::exists(path))
+            path = dir + name + "(" + std::to_string(n++) + ").drc";
+        return path;
+    };
+
+    TriangleMesh mesh;
+    if (selection_only) {
+        if (selection.is_single_full_object()) {
+            const auto obj_idx = selection.get_object_idx();
+            const ModelObject* model_object = p->model.objects[obj_idx];
+            if (selection.get_mode() == Selection::Instance)
+                mesh = mesh_to_export(*model_object, (model_object->instances.size() > 1) ? -1 : selection.get_instance_idx());
+            else {
+                const GLVolume* volume = selection.get_first_volume();
+                mesh = model_object->volumes[volume->volume_idx()]->mesh();
+                mesh.transform(volume->get_volume_transformation().get_matrix(), true);
+            }
+
+            if (model_object->instances.size() == 1) mesh.translate(-model_object->origin_translation.cast<float>());
+        }
+        else if (selection.is_multiple_full_object() && !multi_drcs) {
+            const std::set<std::pair<int, int>>& instances_idxs = p->get_selection().get_selected_object_instances();
+            for (const std::pair<int, int>& i : instances_idxs) {
+                ModelObject* object = p->model.objects[i.first];
+                mesh.merge(mesh_to_export(*object, i.second));
+            }
+        }
+        else if (selection.is_multiple_full_object() && multi_drcs) {
+            const std::set<std::pair<int, int>> &instances_idxs = p->get_selection().get_selected_object_instances();
+            for (const std::pair<int, int> &i : instances_idxs) {
+                ModelObject *object = p->model.objects[i.first];
+                auto mesh = mesh_to_export(*object, i.second);
+                mesh.translate(-object->origin_translation.cast<float>());
+
+                Slic3r::store_drc(get_save_file(path_u8, object->name).c_str(), &mesh, bits, speed);
+            }
+            return;
+        }
+    }
+    else if (!multi_drcs) {
+        for (const ModelObject* o : p->model.objects) {
+            mesh.merge(mesh_to_export(*o, -1));
+        }
+    } else {
+        for (const ModelObject* o : p->model.objects) {
+            auto mesh = mesh_to_export(*o, -1);
+            mesh.translate(-o->origin_translation.cast<float>());
+            Slic3r::store_drc(get_save_file(path_u8, o->name).c_str(), &mesh, bits, speed);
+        }
+        return;
+    }
+
+    Slic3r::store_drc(path_u8.c_str(), &mesh, bits, speed);
+}
+
 namespace {
 std::string get_file_name(const std::string &file_path)
 {

src/slic3r/GUI/Plater.hpp

@@ -414,6 +414,7 @@ public:
     void export_core_3mf();
     static TriangleMesh combine_mesh_fff(const ModelObject& mo, int instance_id, std::function<void(const std::string&)> notify_func = {});
     void export_stl(bool extended = false, bool selection_only = false, bool multi_stls = false);
+    void export_drc(bool extended = false, bool selection_only = false, bool multi_drcs = false);
     //BBS: remove amf
     //void export_amf();
     //BBS add extra param for exporting 3mf silence