SLA archive import will now recover the model's original position.

CMakeLists.txt

@@ -386,7 +386,7 @@ if (NOT EXPAT_FOUND)
     set(EXPAT_LIBRARIES expat)
 endif ()
 
-find_package(PNG)
+find_package(PNG REQUIRED)
 
 find_package(OpenGL REQUIRED)
 

src/libslic3r/Format/SL1.cpp

@@ -162,6 +162,8 @@ void invert_raster_trafo(ExPolygons &                  expolys,
                          coord_t                       width,
                          coord_t                       height)
 {
+    if (trafo.flipXY) std::swap(height, width);
+
     for (auto &expoly : expolys) {
         if (trafo.mirror_y)
             foreach_vertex(expoly, [height](Point &p) {p.y() = height - p.y(); });

src/slic3r/GUI/GUI_ObjectList.cpp

@@ -2209,7 +2209,7 @@ void ObjectList::load_shape_object(const std::string& type_name)
     load_mesh_object(mesh, _(L("Shape")) + "-" + _(type_name));
 }
 
-void ObjectList::load_mesh_object(const TriangleMesh &mesh, const wxString &name)
+void ObjectList::load_mesh_object(const TriangleMesh &mesh, const wxString &name, bool center)
 {   
     // Add mesh to model as a new object
     Model& model = wxGetApp().plater()->model();
@@ -2219,6 +2219,7 @@ void ObjectList::load_mesh_object(const TriangleMesh &mesh, const wxString &name
 #endif /* _DEBUG */
     
     std::vector<size_t> object_idxs;
+    auto bb = mesh.bounding_box();
     ModelObject* new_object = model.add_object();
     new_object->name = into_u8(name);
     new_object->add_instance(); // each object should have at list one instance
@@ -2228,13 +2229,17 @@ void ObjectList::load_mesh_object(const TriangleMesh &mesh, const wxString &name
     // set a default extruder value, since user can't add it manually
     new_volume->config.set_key_value("extruder", new ConfigOptionInt(0));
     new_object->invalidate_bounding_box();
+    new_object->translate(-bb.center());
+
+    if (center) {
+        const BoundingBoxf bed_shape = wxGetApp().plater()->bed_shape_bb();
+        new_object->instances[0]->set_offset(Slic3r::to_3d(bed_shape.center().cast<double>(), -new_object->origin_translation(2)));
+    } else {
+        new_object->instances[0]->set_offset(bb.center());
+    }
 
-    new_object->center_around_origin();
     new_object->ensure_on_bed();
 
-    const BoundingBoxf bed_shape = wxGetApp().plater()->bed_shape_bb();
-    new_object->instances[0]->set_offset(Slic3r::to_3d(bed_shape.center().cast<double>(), -new_object->origin_translation(2)));
-    
     object_idxs.push_back(model.objects.size() - 1);
 #ifdef _DEBUG
     check_model_ids_validity(model);

src/slic3r/GUI/GUI_ObjectList.hpp

@@ -294,7 +294,7 @@ public:
     void                load_part(ModelObject* model_object, std::vector<std::pair<wxString, bool>> &volumes_info, ModelVolumeType type);
 	void                load_generic_subobject(const std::string& type_name, const ModelVolumeType type);
     void                load_shape_object(const std::string &type_name);
-    void                load_mesh_object(const TriangleMesh &mesh, const wxString &name);
+    void                load_mesh_object(const TriangleMesh &mesh, const wxString &name, bool center = true);
     void                del_object(const int obj_idx);
     void                del_subobject_item(wxDataViewItem& item);
     void                del_settings_from_config(const wxDataViewItem& parent_item);

src/slic3r/GUI/Jobs/SLAImportJob.cpp

@@ -219,8 +219,10 @@ void SLAImportJob::finalize()
         wxGetApp().load_current_presets();
     }
     
-    if (!p->mesh.empty())
+    if (!p->mesh.empty()) {
-        p->plater->sidebar().obj_list()->load_mesh_object(p->mesh, name);
+        bool is_centered = false;
+        p->plater->sidebar().obj_list()->load_mesh_object(p->mesh, name, is_centered);
+    }
     
     reset();
 }