Merge remote-tracking branch 'origin/et_outofbed_optimization'

src/libslic3r/Print.cpp

@@ -469,11 +469,13 @@ std::string Print::validate(std::string* warning) const
         return _u8L("The supplied settings will cause an empty print.");
 
     if (m_config.complete_objects) {
-    	if (! sequential_print_horizontal_clearance_valid(*this))
+      if (!sequential_print_horizontal_clearance_valid(*this, const_cast<Polygons*>(&m_sequential_print_clearance_contours)))
-            return _u8L("Some objects are too close; your extruder will collide with them.");
+          return _u8L("Some objects are too close; your extruder will collide with them.");
-        if (! sequential_print_vertical_clearance_valid(*this))
+      if (!sequential_print_vertical_clearance_valid(*this))
-	        return _u8L("Some objects are too tall and cannot be printed without extruder collisions.");
+          return _u8L("Some objects are too tall and cannot be printed without extruder collisions.");
     }
+    else
+        const_cast<Polygons*>(&m_sequential_print_clearance_contours)->clear();
 
     if (m_config.avoid_crossing_perimeters && m_config.avoid_crossing_curled_overhangs) {
         return _u8L("Avoid crossing perimeters option and avoid crossing curled overhangs option cannot be both enabled together.");

src/libslic3r/Print.hpp

@@ -609,6 +609,7 @@ public:
     const PrintRegion&          get_print_region(size_t idx) const  { return *m_print_regions[idx]; }
     const ToolOrdering&         get_tool_ordering() const { return m_wipe_tower_data.tool_ordering; }
 
+    const Polygons& get_sequential_print_clearance_contours() const { return m_sequential_print_clearance_contours; }
     static bool sequential_print_horizontal_clearance_valid(const Print& print, Polygons* polygons = nullptr);
 
 protected:
@@ -658,6 +659,9 @@ private:
     // Estimated print time, filament consumed.
     PrintStatistics                         m_print_statistics;
 
+    // Cache to store sequential print clearance contours
+    Polygons m_sequential_print_clearance_contours;
+
     // To allow GCode to set the Print's GCodeExport step status.
     friend class GCode;
     // To allow GCodeProcessor to emit warnings.

src/slic3r/GUI/3DScene.cpp

@@ -833,64 +833,6 @@ void GLVolumeCollection::render(GLVolumeCollection::ERenderType type, bool disab
     }
 }
 
-bool GLVolumeCollection::check_outside_state(const BuildVolume &build_volume, ModelInstanceEPrintVolumeState *out_state) const
-{
-    const Model&        model              = GUI::wxGetApp().plater()->model();
-    auto                volume_below       = [](GLVolume& volume) -> bool
-        { return volume.object_idx() != -1 && volume.volume_idx() != -1 && volume.is_below_printbed(); };
-    // Volume is partially below the print bed, thus a pre-calculated convex hull cannot be used.
-    auto                volume_sinking     = [](GLVolume& volume) -> bool
-        { return volume.object_idx() != -1 && volume.volume_idx() != -1 && volume.is_sinking(); };
-    // Cached bounding box of a volume above the print bed.
-    auto                volume_bbox        = [volume_sinking](GLVolume& volume) -> BoundingBoxf3 
-        { return volume_sinking(volume) ? volume.transformed_non_sinking_bounding_box() : volume.transformed_convex_hull_bounding_box(); };
-    // Cached 3D convex hull of a volume above the print bed.
-    auto                volume_convex_mesh = [volume_sinking, &model](GLVolume& volume) -> const TriangleMesh&
-        { return volume_sinking(volume) ? model.objects[volume.object_idx()]->volumes[volume.volume_idx()]->mesh() : *volume.convex_hull(); };
-
-    ModelInstanceEPrintVolumeState overall_state = ModelInstancePVS_Inside;
-    bool contained_min_one = false;
-
-    for (GLVolume* volume : this->volumes)
-        if (! volume->is_modifier && (volume->shader_outside_printer_detection_enabled || (! volume->is_wipe_tower && volume->composite_id.volume_id >= 0))) {
-            BuildVolume::ObjectState state;
-            if (volume_below(*volume))
-                state = BuildVolume::ObjectState::Below;
-            else {
-                switch (build_volume.type()) {
-                case BuildVolume::Type::Rectangle:
-                //FIXME this test does not evaluate collision of a build volume bounding box with non-convex objects.
-                    state = build_volume.volume_state_bbox(volume_bbox(*volume));
-                    break;
-                case BuildVolume::Type::Circle:
-                case BuildVolume::Type::Convex:
-                //FIXME doing test on convex hull until we learn to do test on non-convex polygons efficiently.
-                case BuildVolume::Type::Custom:
-                    state = build_volume.object_state(volume_convex_mesh(*volume).its, volume->world_matrix().cast<float>(), volume_sinking(*volume));
-                    break;
-                default:
-                    // Ignore, don't produce any collision.
-                    state = BuildVolume::ObjectState::Inside;
-                    break;
-                }
-                assert(state != BuildVolume::ObjectState::Below);
-            }
-            volume->is_outside = state != BuildVolume::ObjectState::Inside;
-            if (volume->printable) {
-                if (overall_state == ModelInstancePVS_Inside && volume->is_outside)
-                    overall_state = ModelInstancePVS_Fully_Outside;
-                if (overall_state == ModelInstancePVS_Fully_Outside && volume->is_outside && state == BuildVolume::ObjectState::Colliding)
-                    overall_state = ModelInstancePVS_Partly_Outside;
-                contained_min_one |= !volume->is_outside;
-            }
-        }
-
-    if (out_state != nullptr)
-        *out_state = overall_state;
-
-    return contained_min_one;
-}
-
 void GLVolumeCollection::reset_outside_state()
 {
     for (GLVolume* volume : this->volumes) {

src/slic3r/GUI/3DScene.hpp

@@ -450,9 +450,6 @@ public:
     void set_show_sinking_contours(bool show) { m_show_sinking_contours = show; }
     void set_show_non_manifold_edges(bool show) { m_show_non_manifold_edges = show; }
 
-    // returns true if all the volumes are completely contained in the print volume
-    // returns the containment state in the given out_state, if non-null
-    bool check_outside_state(const Slic3r::BuildVolume& build_volume, ModelInstanceEPrintVolumeState* out_state) const;
     void reset_outside_state();
 
     void update_colors_by_extruder(const DynamicPrintConfig* config);

src/slic3r/GUI/GLCanvas3D.cpp

@@ -880,20 +880,22 @@ void GLCanvas3D::Tooltip::render(const Vec2d& mouse_position, GLCanvas3D& canvas
     ImGui::PopStyleVar(2);
 }
 
-void GLCanvas3D::SequentialPrintClearance::set_polygons(const Polygons& polygons)
+void GLCanvas3D::SequentialPrintClearance::set_contours(const ContoursList& contours, bool generate_fill)
 {
-    m_perimeter.reset();
+    m_contours.clear();
+    m_instances.clear();
     m_fill.reset();
-    if (polygons.empty())
+
+    if (contours.empty())
         return;
 
-    if (m_render_fill) {
+    if (generate_fill) {
         GLModel::Geometry fill_data;
         fill_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3 };
-        fill_data.color  = { 0.3333f, 0.0f, 0.0f, 0.5f };
+        fill_data.color = { 0.3333f, 0.0f, 0.0f, 0.5f };
 
         // vertices + indices
-        const ExPolygons polygons_union = union_ex(polygons);
+        const ExPolygons polygons_union = union_ex(contours.contours);
         unsigned int vertices_counter = 0;
         for (const ExPolygon& poly : polygons_union) {
             const std::vector<Vec3d> triangulation = triangulate_expolygon_3d(poly);
@@ -906,17 +908,48 @@ void GLCanvas3D::SequentialPrintClearance::set_polygons(const Polygons& polygons
                     fill_data.add_triangle(vertices_counter - 3, vertices_counter - 2, vertices_counter - 1);
             }
         }
-
         m_fill.init_from(std::move(fill_data));
     }
 
-    m_perimeter.init_from(polygons, 0.025f); // add a small positive z to avoid z-fighting
+    for (size_t i = 0; i < contours.contours.size(); ++i) {
+        GLModel& model = m_contours.emplace_back(GLModel());
+        model.init_from(contours.contours[i], 0.025f); // add a small positive z to avoid z-fighting
+    }
+
+    if (contours.trafos.has_value()) {
+        // create the requested instances
+        for (const auto& instance : *contours.trafos) {
+            m_instances.emplace_back(instance.first, instance.second);
+        }
+    }
+    else {
+        // no instances have been specified
+        // create one instance for every polygon
+        for (size_t i = 0; i < contours.contours.size(); ++i) {
+            m_instances.emplace_back(i, Transform3f::Identity());
+        }
+    }
+}
+
+void GLCanvas3D::SequentialPrintClearance::update_instances_trafos(const std::vector<Transform3d>& trafos)
+{
+    if (trafos.size() == m_instances.size()) {
+        for (size_t i = 0; i < trafos.size(); ++i) {
+            m_instances[i].second = trafos[i];
+        }
+    }
+    else
+      assert(false);
 }
 
 void GLCanvas3D::SequentialPrintClearance::render()
 {
-    const ColorRGBA FILL_COLOR    = { 1.0f, 0.0f, 0.0f, 0.5f };
+    const ColorRGBA FILL_COLOR               = { 1.0f, 0.0f, 0.0f, 0.5f };
-    const ColorRGBA NO_FILL_COLOR = { 1.0f, 1.0f, 1.0f, 0.75f };
+    const ColorRGBA NO_FILL_COLOR            = { 1.0f, 1.0f, 1.0f, 0.75f };
+    const ColorRGBA NO_FILL_EVALUATING_COLOR = { 1.0f, 1.0f, 0.0f, 1.0f };
+
+    if (m_contours.empty() || m_instances.empty())
+        return;
 
     GLShaderProgram* shader = wxGetApp().get_shader("flat");
     if (shader == nullptr)
@@ -933,10 +966,34 @@ void GLCanvas3D::SequentialPrintClearance::render()
     glsafe(::glEnable(GL_BLEND));
     glsafe(::glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
 
-    m_perimeter.set_color(m_render_fill ? FILL_COLOR : NO_FILL_COLOR);
-    m_perimeter.render();
     m_fill.render();
 
+#if ENABLE_GL_CORE_PROFILE
+    if (OpenGLManager::get_gl_info().is_core_profile()) {
+        shader->stop_using();
+
+        shader = wxGetApp().get_shader("dashed_thick_lines");
+        if (shader == nullptr)
+            return;
+
+        shader->start_using();
+        shader->set_uniform("projection_matrix", camera.get_projection_matrix());
+        const std::array<int, 4>& viewport = camera.get_viewport();
+        shader->set_uniform("viewport_size", Vec2d(double(viewport[2]), double(viewport[3])));
+        shader->set_uniform("width", 1.0f);
+        shader->set_uniform("gap_size", 0.0f);
+    }
+    else
+#endif // ENABLE_GL_CORE_PROFILE
+        glsafe(::glLineWidth(2.0f));
+
+    for (const auto& [id, trafo] : m_instances) {
+        shader->set_uniform("view_model_matrix", camera.get_view_matrix() * trafo);
+        assert(id < m_contours.size());
+        m_contours[id].set_color(m_fill.is_initialized() ? FILL_COLOR : m_evaluating ? NO_FILL_EVALUATING_COLOR : NO_FILL_COLOR);
+        m_contours[id].render();
+    }
+
     glsafe(::glDisable(GL_BLEND));
     glsafe(::glEnable(GL_CULL_FACE));
     glsafe(::glDisable(GL_DEPTH_TEST));
@@ -1453,11 +1510,85 @@ void GLCanvas3D::reset_volumes()
 ModelInstanceEPrintVolumeState GLCanvas3D::check_volumes_outside_state() const
 {
     ModelInstanceEPrintVolumeState state = ModelInstanceEPrintVolumeState::ModelInstancePVS_Inside;
-    if (m_initialized)
+    if (m_initialized && !m_volumes.empty())
-        m_volumes.check_outside_state(m_bed.build_volume(), &state);
+        check_volumes_outside_state(m_bed.build_volume(), &state);
     return state;
 }
 
+bool GLCanvas3D::check_volumes_outside_state(const Slic3r::BuildVolume& build_volume, ModelInstanceEPrintVolumeState* out_state) const
+{
+    auto                volume_below = [](GLVolume& volume) -> bool
+    { return volume.object_idx() != -1 && volume.volume_idx() != -1 && volume.is_below_printbed(); };
+    // Volume is partially below the print bed, thus a pre-calculated convex hull cannot be used.
+    auto                volume_sinking = [](GLVolume& volume) -> bool
+    { return volume.object_idx() != -1 && volume.volume_idx() != -1 && volume.is_sinking(); };
+    // Cached bounding box of a volume above the print bed.
+    auto                volume_bbox = [volume_sinking](GLVolume& volume) -> BoundingBoxf3
+    { return volume_sinking(volume) ? volume.transformed_non_sinking_bounding_box() : volume.transformed_convex_hull_bounding_box(); };
+    // Cached 3D convex hull of a volume above the print bed.
+    auto                volume_convex_mesh = [this, volume_sinking](GLVolume& volume) -> const TriangleMesh&
+    { return volume_sinking(volume) ? m_model->objects[volume.object_idx()]->volumes[volume.volume_idx()]->mesh() : *volume.convex_hull(); };
+
+    auto volumes_to_process_idxs = [this]() {
+        std::vector<unsigned int> ret;
+        if (m_selection.is_empty()) {
+            ret = std::vector<unsigned int>(m_volumes.volumes.size());
+            std::iota(ret.begin(), ret.end(), 0);
+        }
+        else {
+            const GUI::Selection::IndicesList& selected_volume_idxs = m_selection.get_volume_idxs();
+            ret.assign(selected_volume_idxs.begin(), selected_volume_idxs.end());
+        }
+        return ret;
+    };
+
+    ModelInstanceEPrintVolumeState overall_state = ModelInstancePVS_Inside;
+    bool contained_min_one = false;
+
+    const std::vector<unsigned int> volumes_idxs = volumes_to_process_idxs();
+
+    for (unsigned int vol_idx : volumes_idxs) {
+        GLVolume* volume = m_volumes.volumes[vol_idx];
+        if (!volume->is_modifier && (volume->shader_outside_printer_detection_enabled || (!volume->is_wipe_tower && volume->composite_id.volume_id >= 0))) {
+            BuildVolume::ObjectState state;
+            if (volume_below(*volume))
+                state = BuildVolume::ObjectState::Below;
+            else {
+                switch (build_volume.type()) {
+                case BuildVolume::Type::Rectangle:
+                    //FIXME this test does not evaluate collision of a build volume bounding box with non-convex objects.
+                    state = build_volume.volume_state_bbox(volume_bbox(*volume));
+                    break;
+                case BuildVolume::Type::Circle:
+                case BuildVolume::Type::Convex:
+                    //FIXME doing test on convex hull until we learn to do test on non-convex polygons efficiently.
+                case BuildVolume::Type::Custom:
+                    state = build_volume.object_state(volume_convex_mesh(*volume).its, volume->world_matrix().cast<float>(), volume_sinking(*volume));
+                    break;
+                default:
+                    // Ignore, don't produce any collision.
+                    state = BuildVolume::ObjectState::Inside;
+                    break;
+                }
+                assert(state != BuildVolume::ObjectState::Below);
+            }
+            volume->is_outside = state != BuildVolume::ObjectState::Inside;
+            if (volume->printable) {
+                if (overall_state == ModelInstancePVS_Inside && volume->is_outside)
+                    overall_state = ModelInstancePVS_Fully_Outside;
+                if (overall_state == ModelInstancePVS_Fully_Outside && volume->is_outside && state == BuildVolume::ObjectState::Colliding)
+                    overall_state = ModelInstancePVS_Partly_Outside;
+                contained_min_one |= !volume->is_outside;
+            }
+        }
+    }
+
+    if (out_state != nullptr)
+        *out_state = overall_state;
+
+    return contained_min_one;
+}
+
 void GLCanvas3D::toggle_sla_auxiliaries_visibility(bool visible, const ModelObject* mo, int instance_idx)
 {
     if (current_printer_technology() != ptSLA)
@@ -2462,7 +2593,7 @@ void GLCanvas3D::reload_scene(bool refresh_immediately, bool force_full_scene_re
     // checks for geometry outside the print volume to render it accordingly
     if (!m_volumes.empty()) {
         ModelInstanceEPrintVolumeState state;
-        const bool contained_min_one = m_volumes.check_outside_state(m_bed.build_volume(), &state);
+        const bool contained_min_one = check_volumes_outside_state(m_bed.build_volume(), &state);
         const bool partlyOut = (state == ModelInstanceEPrintVolumeState::ModelInstancePVS_Partly_Outside);
         const bool fullyOut = (state == ModelInstanceEPrintVolumeState::ModelInstancePVS_Fully_Outside);
 
@@ -3429,17 +3560,12 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
         // Not only detection of some modifiers !!!
         if (evt.Dragging()) {
             GLGizmosManager::EType c = m_gizmos.get_current_type();
-            if (current_printer_technology() == ptFFF &&
+            if (c == GLGizmosManager::EType::Move ||
-                fff_print()->config().complete_objects){
+                c == GLGizmosManager::EType::Scale ||
-                if (c == GLGizmosManager::EType::Move ||
+                c == GLGizmosManager::EType::Rotate) {
-                    c == GLGizmosManager::EType::Scale ||
+                show_sinking_contours();
-                    c == GLGizmosManager::EType::Rotate )
+                if (current_printer_technology() == ptFFF && fff_print()->config().complete_objects)
-                    update_sequential_clearance();
+                    update_sequential_clearance(true);
-            } else {
-                if (c == GLGizmosManager::EType::Move ||
-                    c == GLGizmosManager::EType::Scale ||
-                    c == GLGizmosManager::EType::Rotate)
-                    show_sinking_contours();
             }
         }
         else if (evt.LeftUp() &&
@@ -3639,7 +3765,7 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
             trafo_type.set_relative();
             m_selection.translate(cur_pos - m_mouse.drag.start_position_3D, trafo_type);
             if (current_printer_technology() == ptFFF && fff_print()->config().complete_objects)
-                update_sequential_clearance();
+                update_sequential_clearance(false);
             wxGetApp().obj_manipul()->set_dirty();
             m_dirty = true;
         }
@@ -3945,7 +4071,10 @@ void GLCanvas3D::do_move(const std::string& snapshot_type)
     if (wipe_tower_origin != Vec3d::Zero())
         post_event(Vec3dEvent(EVT_GLCANVAS_WIPETOWER_MOVED, std::move(wipe_tower_origin)));
 
-    reset_sequential_print_clearance();
+    if (current_printer_technology() == ptFFF && fff_print()->config().complete_objects) {
+        update_sequential_clearance(true);
+        m_sequential_print_clearance.m_evaluating = true;
+    }
 
     m_dirty = true;
 }
@@ -4030,6 +4159,11 @@ void GLCanvas3D::do_rotate(const std::string& snapshot_type)
     if (!done.empty())
         post_event(SimpleEvent(EVT_GLCANVAS_INSTANCE_ROTATED));
 
+    if (current_printer_technology() == ptFFF && fff_print()->config().complete_objects) {
+        update_sequential_clearance(true);
+        m_sequential_print_clearance.m_evaluating = true;
+    }
+
     m_dirty = true;
 }
 
@@ -4102,6 +4236,11 @@ void GLCanvas3D::do_scale(const std::string& snapshot_type)
     if (!done.empty())
         post_event(SimpleEvent(EVT_GLCANVAS_INSTANCE_SCALED));
 
+    if (current_printer_technology() == ptFFF && fff_print()->config().complete_objects) {
+        update_sequential_clearance(true);
+        m_sequential_print_clearance.m_evaluating = true;
+    }
+
     m_dirty = true;
 }
 
@@ -4369,16 +4508,33 @@ void GLCanvas3D::mouse_up_cleanup()
         m_canvas->ReleaseMouse();
 }
 
-void GLCanvas3D::update_sequential_clearance()
+void GLCanvas3D::update_sequential_clearance(bool force_contours_generation)
 {
     if (current_printer_technology() != ptFFF || !fff_print()->config().complete_objects)
         return;
 
-    if (m_layers_editing.is_enabled() || m_gizmos.is_dragging())
+    if (m_layers_editing.is_enabled())
         return;
 
+    auto instance_transform_from_volumes = [this](int object_idx, int instance_idx) {
+        for (const GLVolume* v : m_volumes.volumes) {
+            if (v->object_idx() == object_idx && v->instance_idx() == instance_idx)
+                return v->get_instance_transformation();
+        }
+        assert(false);
+        return Geometry::Transformation();
+    };
+
+    auto is_object_outside_printbed = [this](int object_idx) {
+        for (const GLVolume* v : m_volumes.volumes) {
+            if (v->object_idx() == object_idx && v->is_outside)
+                return true;
+        }
+        return false;
+    };
+
     // collects instance transformations from volumes
-    // first define temporary cache
+    // first: define temporary cache
     unsigned int instances_count = 0;
     std::vector<std::vector<std::optional<Geometry::Transformation>>> instance_transforms;
     for (size_t obj = 0; obj < m_model->objects.size(); ++obj) {
@@ -4393,67 +4549,95 @@ void GLCanvas3D::update_sequential_clearance()
     if (instances_count == 1)
         return;
 
-    // second fill temporary cache with data from volumes
+    // second: fill temporary cache with data from volumes
     for (const GLVolume* v : m_volumes.volumes) {
-        if (v->is_modifier || v->is_wipe_tower)
+        if (v->is_wipe_tower)
             continue;
 
-        auto& transform = instance_transforms[v->object_idx()][v->instance_idx()];
+        const int object_idx = v->object_idx();
+        const int instance_idx = v->instance_idx();
+        auto& transform = instance_transforms[object_idx][instance_idx];
         if (!transform.has_value())
-            transform = v->get_instance_transformation();
+            transform = instance_transform_from_volumes(object_idx, instance_idx);
     }
 
+    // helper function to calculate the transformation to be applied to the sequential print clearance contours
+    auto instance_trafo = [](const Transform3d& hull_trafo, const Geometry::Transformation& inst_trafo) {
+        Vec3d offset = inst_trafo.get_offset() - hull_trafo.translation();
+        offset.z() = 0.0;
+        return Geometry::translation_transform(offset) *
+            Geometry::rotation_transform(Geometry::rotation_diff_z(hull_trafo, inst_trafo.get_matrix()) * Vec3d::UnitZ());
+    };
+
     // calculates objects 2d hulls (see also: Print::sequential_print_horizontal_clearance_valid())
     // this is done only the first time this method is called while moving the mouse,
     // the results are then cached for following displacements
-    if (m_sequential_print_clearance_first_displacement) {
+    if (force_contours_generation || m_sequential_print_clearance_first_displacement) {
-        m_sequential_print_clearance.m_hull_2d_cache.clear();
+        m_sequential_print_clearance.m_evaluating = false;
+        m_sequential_print_clearance.m_hulls_2d_cache.clear();
         const float shrink_factor = static_cast<float>(scale_(0.5 * fff_print()->config().extruder_clearance_radius.value - EPSILON));
         const double mitter_limit = scale_(0.1);
-        m_sequential_print_clearance.m_hull_2d_cache.reserve(m_model->objects.size());
+        m_sequential_print_clearance.m_hulls_2d_cache.reserve(m_model->objects.size());
         for (size_t i = 0; i < m_model->objects.size(); ++i) {
             ModelObject* model_object = m_model->objects[i];
-            ModelInstance* model_instance0 = model_object->instances.front();
+            Geometry::Transformation trafo = instance_transform_from_volumes((int)i, 0);
-            Geometry::Transformation trafo = model_instance0->get_transformation();
+            trafo.set_offset({ 0.0, 0.0, trafo.get_offset().z() });
-            trafo.set_offset({ 0.0, 0.0, model_instance0->get_offset().z() });
+            Pointf3s& new_hull_2d = m_sequential_print_clearance.m_hulls_2d_cache.emplace_back(std::make_pair(Pointf3s(), trafo.get_matrix())).first;
-            const Polygon hull_2d = offset(model_object->convex_hull_2d(trafo.get_matrix()),
+            if (is_object_outside_printbed((int)i))
+                continue;
+
+            Polygon hull_2d = model_object->convex_hull_2d(trafo.get_matrix());
+            if (!hull_2d.empty()) {
                 // Shrink the extruder_clearance_radius a tiny bit, so that if the object arrangement algorithm placed the objects
                 // exactly by satisfying the extruder_clearance_radius, this test will not trigger collision.
-                shrink_factor,
+                const Polygons offset_res = offset(hull_2d, shrink_factor, jtRound, mitter_limit);
-                jtRound, mitter_limit).front();
+                if (!offset_res.empty())
+                    hull_2d = offset_res.front();
+            }
 
-            Pointf3s& cache_hull_2d = m_sequential_print_clearance.m_hull_2d_cache.emplace_back(Pointf3s());
+            new_hull_2d.reserve(hull_2d.points.size());
-            cache_hull_2d.reserve(hull_2d.points.size());
             const Transform3d inv_trafo = trafo.get_matrix().inverse();
             for (const Point& p : hull_2d.points) {
-                cache_hull_2d.emplace_back(inv_trafo * Vec3d(unscale<double>(p.x()), unscale<double>(p.y()), 0.0));
+                new_hull_2d.emplace_back(Vec3d(unscale<double>(p.x()), unscale<double>(p.y()), 0.0));
             }
         }
+
+        ContoursList contours;
+        contours.contours.reserve(instance_transforms.size());
+        contours.trafos = std::vector<std::pair<size_t, Transform3d>>();
+        (*contours.trafos).reserve(instances_count);
+        for (size_t i = 0; i < instance_transforms.size(); ++i) {
+            const auto& [hull, hull_trafo] = m_sequential_print_clearance.m_hulls_2d_cache[i];
+            Points hull_pts;
+            hull_pts.reserve(hull.size());
+            for (size_t j = 0; j < hull.size(); ++j) {
+                hull_pts.emplace_back(scaled<double>(hull[j].x()), scaled<double>(hull[j].y()));
+            }
+            contours.contours.emplace_back(Geometry::convex_hull(std::move(hull_pts)));
+
+            const auto& instances = instance_transforms[i];
+            for (const auto& instance : instances) {
+                (*contours.trafos).emplace_back(i, instance_trafo(hull_trafo, *instance));
+            }
+        }
+
+        set_sequential_print_clearance_contours(contours, false);
         m_sequential_print_clearance_first_displacement = false;
     }
-
+    else {
-    // calculates instances 2d hulls (see also: Print::sequential_print_horizontal_clearance_valid())
+        if (!m_sequential_print_clearance.empty()) {
-    Polygons polygons;
+            std::vector<Transform3d> trafos;
-    polygons.reserve(instances_count);
+            trafos.reserve(instances_count);
-    for (size_t i = 0; i < instance_transforms.size(); ++i) {
+            for (size_t i = 0; i < instance_transforms.size(); ++i) {
-        const auto& instances = instance_transforms[i];
+                const auto& [hull, hull_trafo] = m_sequential_print_clearance.m_hulls_2d_cache[i];
-        for (const auto& instance : instances) {
+                const auto& instances = instance_transforms[i];
-            const Transform3d& trafo = instance->get_matrix();
+                for (const auto& instance : instances) {
-            const Pointf3s& hull_2d = m_sequential_print_clearance.m_hull_2d_cache[i];
+                    trafos.emplace_back(instance_trafo(hull_trafo, *instance));
-            Points inst_pts;
+                }
-            inst_pts.reserve(hull_2d.size());
-            for (size_t j = 0; j < hull_2d.size(); ++j) {
-                const Vec3d p = trafo * hull_2d[j];
-                inst_pts.emplace_back(scaled<double>(p.x()), scaled<double>(p.y()));
             }
-            polygons.emplace_back(Geometry::convex_hull(std::move(inst_pts)));
+            m_sequential_print_clearance.update_instances_trafos(trafos);
         }
     }
-
-    // sends instances 2d hulls to be rendered
-    set_sequential_print_clearance_visible(true);
-    set_sequential_print_clearance_render_fill(false);
-    set_sequential_print_clearance_polygons(polygons);
 }
 
 bool GLCanvas3D::is_object_sinking(int object_idx) const
@@ -5933,7 +6117,7 @@ void GLCanvas3D::_render_objects(GLVolumeCollection::ERenderType type)
         }
         }
         if (m_requires_check_outside_state) {
-            m_volumes.check_outside_state(build_volume, nullptr);
+            check_volumes_outside_state(build_volume, nullptr);
             m_requires_check_outside_state = false;
         }
     }
@@ -6028,15 +6212,20 @@ void GLCanvas3D::_render_selection()
 
 void GLCanvas3D::_render_sequential_clearance()
 {
-    if (m_layers_editing.is_enabled() || m_gizmos.is_dragging())
+    if (current_printer_technology() != ptFFF || !fff_print()->config().complete_objects)
+        return;
+
+    if (m_layers_editing.is_enabled())
         return;
 
     switch (m_gizmos.get_current_type())
     {
     case GLGizmosManager::EType::Flatten:
     case GLGizmosManager::EType::Cut:
-    case GLGizmosManager::EType::Hollow:
+    case GLGizmosManager::EType::MmuSegmentation:
-    case GLGizmosManager::EType::SlaSupports:
+    case GLGizmosManager::EType::Measure:
+    case GLGizmosManager::EType::Emboss:
+    case GLGizmosManager::EType::Simplify:
     case GLGizmosManager::EType::FdmSupports:
     case GLGizmosManager::EType::Seam: { return; }
     default: { break; }

src/slic3r/GUI/GLCanvas3D.hpp

@@ -618,23 +618,35 @@ public:
         return ret;
     }
 
+    struct ContoursList
+    {
+        // list of unique contours
+        Polygons contours;
+        // if defined: list of transforms to apply to contours
+        std::optional<std::vector<std::pair<size_t, Transform3d>>> trafos;
+
+        bool empty() const { return contours.empty(); }
+    };
+
 private:
     void load_arrange_settings();
 
     class SequentialPrintClearance
     {
         GLModel m_fill;
-        GLModel m_perimeter;
+        // list of unique contours
-        bool m_render_fill{ true };
+        std::vector<GLModel> m_contours;
-        bool m_visible{ false };
+        // list of transforms used to render the contours
+        std::vector<std::pair<size_t, Transform3d>> m_instances;
+        bool m_evaluating{ false };
 
-        std::vector<Pointf3s> m_hull_2d_cache;
+        std::vector<std::pair<Pointf3s, Transform3d>> m_hulls_2d_cache;
 
     public:
-        void set_polygons(const Polygons& polygons);
+        void set_contours(const ContoursList& contours, bool generate_fill);
-        void set_render_fill(bool render_fill) { m_render_fill = render_fill; }
+        void update_instances_trafos(const std::vector<Transform3d>& trafos);
-        void set_visible(bool visible) { m_visible = visible; }
         void render();
+        bool empty() const { return m_contours.empty(); }
 
         friend class GLCanvas3D;
     };
@@ -725,6 +737,9 @@ public:
     const GLVolumeCollection& get_volumes() const { return m_volumes; }
     void reset_volumes();
     ModelInstanceEPrintVolumeState check_volumes_outside_state() const;
+    // returns true if all the volumes are completely contained in the print volume
+    // returns the containment state in the given out_state, if non-null
+    bool check_volumes_outside_state(const Slic3r::BuildVolume& build_volume, ModelInstanceEPrintVolumeState* out_state) const;
 
     void init_gcode_viewer() { m_gcode_viewer.init(); }
     void reset_gcode_toolpaths() { m_gcode_viewer.reset(); }
@@ -958,24 +973,23 @@ public:
     }
 
     void reset_sequential_print_clearance() {
-        m_sequential_print_clearance.set_visible(false);
+        m_sequential_print_clearance.m_evaluating = false;
-        m_sequential_print_clearance.set_render_fill(false);
+        m_sequential_print_clearance.set_contours(ContoursList(), false);
-        m_sequential_print_clearance.set_polygons(Polygons());
     }
 
-    void set_sequential_print_clearance_visible(bool visible) {
+    void set_sequential_print_clearance_contours(const ContoursList& contours, bool generate_fill) {
-        m_sequential_print_clearance.set_visible(visible);
+        m_sequential_print_clearance.set_contours(contours, generate_fill);
     }
 
-    void set_sequential_print_clearance_render_fill(bool render_fill) {
+    bool is_sequential_print_clearance_empty() const {
-        m_sequential_print_clearance.set_render_fill(render_fill);
+        return m_sequential_print_clearance.empty();
     }
 
-    void set_sequential_print_clearance_polygons(const Polygons& polygons) {
+    bool is_sequential_print_clearance_evaluating() const {
-        m_sequential_print_clearance.set_polygons(polygons);
+        return m_sequential_print_clearance.m_evaluating;
     }
 
-    void update_sequential_clearance();
+    void update_sequential_clearance(bool force_contours_generation);
 
     const Print* fff_print() const;
     const SLAPrint* sla_print() const;

src/slic3r/GUI/GLModel.cpp

@@ -596,6 +596,38 @@ void GLModel::init_from(const indexed_triangle_set& its)
     }
 }
 
+void GLModel::init_from(const Polygon& polygon, float z)
+{
+    if (is_initialized()) {
+        // call reset() if you want to reuse this model
+        assert(false);
+        return;
+    }
+
+    Geometry& data = m_render_data.geometry;
+    data.format = { Geometry::EPrimitiveType::Lines, Geometry::EVertexLayout::P3 };
+
+    const size_t segments_count = polygon.points.size();
+    data.reserve_vertices(2 * segments_count);
+    data.reserve_indices(2 * segments_count);
+
+    // vertices + indices
+    unsigned int vertices_counter = 0;
+    for (size_t i = 0; i < segments_count; ++i) {
+        const Point& p0 = polygon.points[i];
+        const Point& p1 = (i == segments_count - 1) ? polygon.points.front() : polygon.points[i + 1];
+        data.add_vertex(Vec3f(unscale<float>(p0.x()), unscale<float>(p0.y()), z));
+        data.add_vertex(Vec3f(unscale<float>(p1.x()), unscale<float>(p1.y()), z));
+        vertices_counter += 2;
+        data.add_line(vertices_counter - 2, vertices_counter - 1);
+    }
+
+    // update bounding box
+    for (size_t i = 0; i < vertices_count(); ++i) {
+        m_bounding_box.merge(data.extract_position_3(i).cast<double>());
+    }
+}
+
 void GLModel::init_from(const Polygons& polygons, float z)
 {
     if (is_initialized()) {

src/slic3r/GUI/GLModel.hpp

@@ -227,6 +227,7 @@ namespace GUI {
         void init_from(const TriangleMesh& mesh);
 #endif // ENABLE_SMOOTH_NORMALS
         void init_from(const indexed_triangle_set& its);
+        void init_from(const Polygon& polygon, float z);
         void init_from(const Polygons& polygons, float z);
         bool init_from_file(const std::string& filename);
 

src/slic3r/GUI/GUI_ObjectManipulation.cpp

@@ -859,13 +859,13 @@ wxString ObjectManipulation::coordinate_type_str(ECoordinatesType type)
 #if ENABLE_OBJECT_MANIPULATION_DEBUG
 void ObjectManipulation::render_debug_window()
 {
-  ImGuiWrapper& imgui = *wxGetApp().imgui();
+    ImGuiWrapper& imgui = *wxGetApp().imgui();
-//  ImGui::SetNextWindowCollapsed(true, ImGuiCond_Once);
+//   ImGui::SetNextWindowCollapsed(true, ImGuiCond_Once);
-  imgui.begin(std::string("ObjectManipulation"), ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoResize);
+    imgui.begin(std::string("ObjectManipulation"), ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoResize);
-  imgui.text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, "Coordinates type");
+    imgui.text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, "Coordinates type");
-  ImGui::SameLine();
+    ImGui::SameLine();
-  imgui.text(coordinate_type_str(m_coordinates_type));
+    imgui.text(coordinate_type_str(m_coordinates_type));
-  imgui.end();
+    imgui.end();
 }
 #endif // ENABLE_OBJECT_MANIPULATION_DEBUG
 

src/slic3r/GUI/Plater.cpp

@@ -3294,29 +3294,43 @@ unsigned int Plater::priv::update_background_process(bool force_validation, bool
             // or hide the old one.
             process_validation_warning(warning);
             if (printer_technology == ptFFF) {
-                view3D->get_canvas3d()->reset_sequential_print_clearance();
+                GLCanvas3D* canvas = view3D->get_canvas3d();
-                view3D->get_canvas3d()->set_as_dirty();
+                if (canvas->is_sequential_print_clearance_evaluating()) {
-                view3D->get_canvas3d()->request_extra_frame();
+                    canvas->reset_sequential_print_clearance();
+                    canvas->set_as_dirty();
+                    canvas->request_extra_frame();
+                }
             }
         }
         else {
-			// The print is not valid.
+            // The print is not valid.
-			// Show error as notification.
+            // Show error as notification.
             notification_manager->push_validate_error_notification(err);
             return_state |= UPDATE_BACKGROUND_PROCESS_INVALID;
             if (printer_technology == ptFFF) {
-                const Print* print = background_process.fff_print();
+                GLCanvas3D* canvas = view3D->get_canvas3d();
-                Polygons polygons;
+                if (canvas->is_sequential_print_clearance_empty() || canvas->is_sequential_print_clearance_evaluating()) {
-                if (print->config().complete_objects)
+                    GLCanvas3D::ContoursList contours;
-                    Print::sequential_print_horizontal_clearance_valid(*print, &polygons);
+                    contours.contours = background_process.fff_print()->get_sequential_print_clearance_contours();
-                view3D->get_canvas3d()->set_sequential_print_clearance_visible(true);
+                    canvas->set_sequential_print_clearance_contours(contours, true);
-                view3D->get_canvas3d()->set_sequential_print_clearance_render_fill(true);
+                }
-                view3D->get_canvas3d()->set_sequential_print_clearance_polygons(polygons);
             }
         }
     }
     else {
         if (invalidated == Print::APPLY_STATUS_UNCHANGED && !background_process.empty()) {
+            if (printer_technology == ptFFF) {
+                // Object manipulation with gizmos may end up in a null transformation.
+                // In this case, we need to trigger the completion of the sequential print clearance contours evaluation 
+                GLCanvas3D* canvas = view3D->get_canvas3d();
+                if (canvas->is_sequential_print_clearance_evaluating()) {
+                    GLCanvas3D::ContoursList contours;
+                    contours.contours = background_process.fff_print()->get_sequential_print_clearance_contours();
+                    canvas->set_sequential_print_clearance_contours(contours, true);
+                    canvas->set_as_dirty();
+                    canvas->request_extra_frame();
+                }
+            }
             std::string warning;
             std::string err = background_process.validate(&warning);
             if (!err.empty())
@@ -4418,7 +4432,6 @@ void Plater::priv::on_update_geometry(Vec3dsEvent<2>&)
 
 void Plater::priv::on_3dcanvas_mouse_dragging_started(SimpleEvent&)
 {
-    view3D->get_canvas3d()->reset_sequential_print_clearance();
 }
 
 // Update the scene from the background processing,