Slice only objects contained into the print volume

xs/src/libslic3r/GCode.cpp

@@ -776,9 +776,10 @@ void GCode::_do_export(Print &print, FILE *file, GCodePreviewData *preview_data)
         // Order objects using a nearest neighbor search.
         std::vector<size_t> object_indices;
         Points object_reference_points;
-        for (PrintObject *object : print.objects)
+        PrintObjectPtrs printable_objects = print.get_printable_objects();
+        for (PrintObject *object : printable_objects)
             object_reference_points.push_back(object->_shifted_copies.front());
-        Slic3r::Geometry::chained_path(object_reference_points, object_indices);
+            Slic3r::Geometry::chained_path(object_reference_points, object_indices);
         // Sort layers by Z.
         // All extrusion moves with the same top layer height are extruded uninterrupted.
         std::vector<std::pair<coordf_t, std::vector<LayerToPrint>>> layers_to_print = collect_layers_to_print(print);
@@ -790,7 +791,7 @@ void GCode::_do_export(Print &print, FILE *file, GCodePreviewData *preview_data)
             // Verify, whether the print overaps the priming extrusions.
             BoundingBoxf bbox_print(get_print_extrusions_extents(print));
             coordf_t twolayers_printz = ((layers_to_print.size() == 1) ? layers_to_print.front() : layers_to_print[1]).first + EPSILON;
-            for (const PrintObject *print_object : print.objects)
+            for (const PrintObject *print_object : printable_objects)
                 bbox_print.merge(get_print_object_extrusions_extents(*print_object, twolayers_printz));
             bbox_print.merge(get_wipe_tower_extrusions_extents(print, twolayers_printz));
             BoundingBoxf bbox_prime(get_wipe_tower_priming_extrusions_extents(print));

xs/src/libslic3r/GCode/ToolOrdering.cpp

@@ -67,11 +67,13 @@ ToolOrdering::ToolOrdering(const PrintObject &object, unsigned int first_extrude
 ToolOrdering::ToolOrdering(const Print &print, unsigned int first_extruder, bool prime_multi_material)
 {
     m_print_config_ptr = &print.config;
+
+    PrintObjectPtrs objects = print.get_printable_objects();
     // Initialize the print layers for all objects and all layers.
     coordf_t object_bottom_z = 0.;
     {
         std::vector<coordf_t> zs;
-        for (auto object : print.objects) {
+        for (auto object : objects) {
             zs.reserve(zs.size() + object->layers.size() + object->support_layers.size());
             for (auto layer : object->layers)
                 zs.emplace_back(layer->print_z);
@@ -84,7 +86,7 @@ ToolOrdering::ToolOrdering(const Print &print, unsigned int first_extruder, bool
     }
 
     // Collect extruders reuqired to print the layers.
-    for (auto object : print.objects)
+    for (auto object : objects)
         this->collect_extruders(*object);
 
     // Reorder the extruders to minimize tool switches.

xs/src/libslic3r/Model.cpp

@@ -1235,6 +1235,54 @@ void ModelObject::split(ModelObjectPtrs* new_objects)
     return;
 }
 
+void ModelObject::check_instances_printability(const BoundingBoxf3& print_volume)
+{
+    for (ModelVolume* vol : this->volumes)
+    {
+        if (!vol->modifier)
+        {
+            for (ModelInstance* inst : this->instances)
+            {
+                BoundingBoxf3 bb;
+
+                double c = cos(inst->rotation);
+                double s = sin(inst->rotation);
+
+                for (int f = 0; f < vol->mesh.stl.stats.number_of_facets; ++f)
+                {
+                    const stl_facet& facet = vol->mesh.stl.facet_start[f];
+
+                    for (int i = 0; i < 3; ++i)
+                    {
+                        // original point
+                        const stl_vertex& v = facet.vertex[i];
+                        Pointf3 p((double)v.x, (double)v.y, (double)v.z);
+
+                        // scale
+                        p.x *= inst->scaling_factor;
+                        p.y *= inst->scaling_factor;
+                        p.z *= inst->scaling_factor;
+
+                        // rotate Z
+                        double x = p.x;
+                        double y = p.y;
+                        p.x = c * x - s * y;
+                        p.y = s * x + c * y;
+
+                        // translate
+                        p.x += inst->offset.x;
+                        p.y += inst->offset.y;
+
+                        bb.merge(p);
+
+                        inst->is_printable = print_volume.contains(bb);
+                    }
+                }
+            }
+        }
+    }
+}
+
 void ModelObject::print_info() const
 {
     using namespace std;

xs/src/libslic3r/Model.hpp

@@ -131,6 +131,7 @@ public:
     bool needed_repair() const;
     void cut(coordf_t z, Model* model) const;
     void split(ModelObjectPtrs* new_objects);
+    void check_instances_printability(const BoundingBoxf3& print_volume);
 
     // Print object statistics to console.
     void print_info() const;
@@ -203,6 +204,9 @@ public:
     double scaling_factor;
     Pointf offset;              // in unscaled coordinates
     
+    // whether or not this instance is contained in the print volume (set by Print::validate() using ModelObject::check_instances_printability())
+    bool is_printable;
+
     ModelObject* get_object() const { return this->object; }
 
     // To be called on an external mesh
@@ -218,9 +222,9 @@ private:
     // Parent object, owning this instance.
     ModelObject* object;
 
-    ModelInstance(ModelObject *object) : rotation(0), scaling_factor(1), object(object) {}
+    ModelInstance(ModelObject *object) : rotation(0), scaling_factor(1), object(object), is_printable(false) {}
     ModelInstance(ModelObject *object, const ModelInstance &other) :
-        rotation(other.rotation), scaling_factor(other.scaling_factor), offset(other.offset), object(object) {}
+        rotation(other.rotation), scaling_factor(other.scaling_factor), offset(other.offset), object(object), is_printable(false) {}
 };
 
 

xs/src/libslic3r/Print.cpp

@@ -71,6 +71,13 @@ bool Print::reload_model_instances()
     return invalidated;
 }
 
+PrintObjectPtrs Print::get_printable_objects() const
+{
+    PrintObjectPtrs printable_objects(this->objects);
+    printable_objects.erase(std::remove_if(printable_objects.begin(), printable_objects.end(), [](PrintObject* o) { return !o->is_printable(); }), printable_objects.end());
+    return printable_objects;
+}
+
 PrintRegion* Print::add_region()
 {
     regions.push_back(new PrintRegion(this));
@@ -534,11 +541,17 @@ std::string Print::validate() const
     BoundingBoxf3 print_volume(Pointf3(unscale(bed_box_2D.min.x), unscale(bed_box_2D.min.y), 0.0), Pointf3(unscale(bed_box_2D.max.x), unscale(bed_box_2D.max.y), config.max_print_height));
     // Allow the objects to protrude below the print bed, only the part of the object above the print bed will be sliced.
     print_volume.min.z = -1e10;
+    unsigned int printable_count = 0;
     for (PrintObject *po : this->objects) {
-        if (!print_volume.contains(po->model_object()->tight_bounding_box(false)))
+        po->model_object()->check_instances_printability(print_volume);
-            return L("Some objects are outside of the print volume.");
+        po->reload_model_instances();
+        if (po->is_printable())
+            ++printable_count;
     }
 
+    if (printable_count == 0)
+        return L("All objects are outside of the print volume.");
+
     if (this->config.complete_objects) {
         // Check horizontal clearance.
         {
@@ -858,8 +871,9 @@ void Print::_make_skirt()
     // prepended to the first 'n' layers (with 'n' = skirt_height).
     // $skirt_height_z in this case is the highest possible skirt height for safety.
     coordf_t skirt_height_z = 0.;
-    for (const PrintObject *object : this->objects) {
+    PrintObjectPtrs printable_objects = get_printable_objects();
-        size_t skirt_layers = this->has_infinite_skirt() ? 
+    for (const PrintObject *object : printable_objects) {
+        size_t skirt_layers = this->has_infinite_skirt() ?
             object->layer_count() : 
             std::min(size_t(this->config.skirt_height.value), object->layer_count());
         skirt_height_z = std::max(skirt_height_z, object->layers[skirt_layers-1]->print_z);
@@ -867,7 +881,7 @@ void Print::_make_skirt()
     
     // Collect points from all layers contained in skirt height.
     Points points;
-    for (const PrintObject *object : this->objects) {
+    for (const PrintObject *object : printable_objects) {
         Points object_points;
         // Get object layers up to skirt_height_z.
         for (const Layer *layer : object->layers) {
@@ -980,7 +994,8 @@ void Print::_make_brim()
     // Brim is only printed on first layer and uses perimeter extruder.
     Flow        flow = this->brim_flow();
     Polygons    islands;
-    for (PrintObject *object : this->objects) {
+    PrintObjectPtrs printable_objects = get_printable_objects();
+    for (PrintObject *object : printable_objects) {
         Polygons object_islands;
         for (ExPolygon &expoly : object->layers.front()->slices.expolygons)
             object_islands.push_back(expoly.contour);

xs/src/libslic3r/Print.hpp

@@ -209,6 +209,8 @@ public:
     void combine_infill();
     void _generate_support_material();
 
+    bool is_printable() const { return !this->_shifted_copies.empty(); }
+
 private:
     Print* _print;
     ModelObject* _model_object;
@@ -257,6 +259,8 @@ public:
     void reload_object(size_t idx);
     bool reload_model_instances();
 
+    PrintObjectPtrs get_printable_objects() const;
+
     // methods for handling regions
     PrintRegion* get_region(size_t idx) { return regions.at(idx); }
     const PrintRegion* get_region(size_t idx) const  { return regions.at(idx); }

xs/src/libslic3r/PrintObject.cpp

@@ -102,7 +102,10 @@ bool PrintObject::reload_model_instances()
     Points copies;
     copies.reserve(this->_model_object->instances.size());
     for (const ModelInstance *mi : this->_model_object->instances)
-        copies.emplace_back(Point::new_scale(mi->offset.x, mi->offset.y));
+    {
+        if (mi->is_printable)
+            copies.emplace_back(Point::new_scale(mi->offset.x, mi->offset.y));
+    }
     return this->set_copies(copies);
 }
 
@@ -291,6 +294,9 @@ bool PrintObject::has_support_material() const
 
 void PrintObject::_prepare_infill()
 {
+    if (!this->is_printable())
+        return;
+
     // This will assign a type (top/bottom/internal) to $layerm->slices.
     // Then the classifcation of $layerm->slices is transfered onto 
     // the $layerm->fill_surfaces by clipping $layerm->fill_surfaces
@@ -1442,6 +1448,9 @@ void PrintObject::_simplify_slices(double distance)
 
 void PrintObject::_make_perimeters()
 {
+    if (!this->is_printable())
+        return;
+
     if (this->state.is_done(posPerimeters)) return;
     this->state.set_started(posPerimeters);
 
@@ -1550,6 +1559,9 @@ void PrintObject::_make_perimeters()
 
 void PrintObject::_infill()
 {
+    if (!this->is_printable())
+        return;
+
     if (this->state.is_done(posInfill)) return;
     this->state.set_started(posInfill);
     
@@ -1954,6 +1966,9 @@ void PrintObject::combine_infill()
 
 void PrintObject::_generate_support_material()
 {
+    if (!this->is_printable())
+        return;
+
     PrintObjectSupportMaterial support_material(this, PrintObject::slicing_parameters());
     support_material.generate(*this);
 }

xs/src/slic3r/GUI/GLCanvas3D.cpp

@@ -2087,20 +2087,20 @@ void GLCanvas3D::reload_scene(bool force)
         {
             enable_warning_texture(true);
             _3DScene::generate_warning_texture(L("Detected object outside print volume"));
-            m_on_enable_action_buttons_callback.call(false);
         }
         else
         {
             enable_warning_texture(false);
             m_volumes.reset_outside_state();
             _3DScene::reset_warning_texture();
-            m_on_enable_action_buttons_callback.call(!m_model->objects.empty());
         }
+        m_on_enable_action_buttons_callback.call(!m_model->objects.empty());
     }
     else
     {
         enable_warning_texture(false);
         _3DScene::reset_warning_texture();
+        m_on_enable_action_buttons_callback.call(false);
     }
 }