Keep model objects aligned to Z = 0 in plater

xs/src/libslic3r/Model.cpp

@@ -480,26 +480,31 @@ ModelObject::center_around_origin()
         mesh.bounding_box(&bb);
     }
     
-    // first align to origin on XY
-    double shift_x = -bb.min.x;
-    double shift_y = -bb.min.y;
+    // first align to origin on XYZ
+    Vectorf3 vector(-bb.min.x, -bb.min.y, -bb.min.z);
     
     // then center it on XY
     Sizef3 size = bb.size();
-    shift_x -= size.x/2;
-    shift_y -= size.y/2;
+    vector.x -= size.x/2;
+    vector.y -= size.y/2;
     
-    this->translate(shift_x, shift_y, 0);
-    this->origin_translation.translate(shift_x, shift_y);
+    this->translate(vector);
+    this->origin_translation.translate(vector);
     
     if (!this->instances.empty()) {
         for (ModelInstancePtrs::const_iterator i = this->instances.begin(); i != this->instances.end(); ++i) {
-            (*i)->offset.translate(-shift_x, -shift_y);
+            (*i)->offset.translate(-vector.x, -vector.y);
         }
         this->update_bounding_box();
     }
 }
 
+void
+ModelObject::translate(const Vectorf3 &vector)
+{
+    this->translate(vector.x, vector.y, vector.z);
+}
+
 void
 ModelObject::translate(coordf_t x, coordf_t y, coordf_t z)
 {

xs/src/libslic3r/Model.hpp

@@ -99,7 +99,7 @@ class ModelObject
         center_around_origin() method. Callers might want to apply the same translation
         to new volumes before adding them to this object in order to preset alignment
         when user expects that. */
-    Pointf origin_translation;
+    Pointf3 origin_translation;
     
     // these should be private but we need to expose them via XS until all methods are ported
     BoundingBoxf3 _bounding_box;
@@ -126,6 +126,7 @@ class ModelObject
     void raw_bounding_box(BoundingBoxf3* bb) const;
     void instance_bounding_box(size_t instance_idx, BoundingBoxf3* bb) const;
     void center_around_origin();
+    void translate(const Vectorf3 &vector);
     void translate(coordf_t x, coordf_t y, coordf_t z);
     void scale(const Pointf3 &versor);
     size_t materials_count() const;

xs/src/libslic3r/Point.cpp

@@ -41,7 +41,7 @@ Point::translate(double x, double y)
 }
 
 void
-Point::translate(const Point &vector)
+Point::translate(const Vector &vector)
 {
     this->translate(vector.x, vector.y);
 }
@@ -340,6 +340,12 @@ Pointf3::scale(double factor)
     this->z *= factor;
 }
 
+void
+Pointf3::translate(const Vectorf3 &vector)
+{
+    this->translate(vector.x, vector.y, vector.z);
+}
+
 void
 Pointf3::translate(double x, double y, double z)
 {

xs/src/libslic3r/Point.hpp

@@ -14,6 +14,7 @@ class Point;
 class Pointf;
 class Pointf3;
 typedef Point Vector;
+typedef Pointf3 Vectorf3;
 typedef std::vector<Point> Points;
 typedef std::vector<Point*> PointPtrs;
 typedef std::vector<const Point*> PointConstPtrs;
@@ -36,7 +37,7 @@ class Point
     std::string wkt() const;
     void scale(double factor);
     void translate(double x, double y);
-    void translate(const Point &vector);
+    void translate(const Vector &vector);
     void rotate(double angle, const Point &center);
     bool coincides_with(const Point &point) const;
     bool coincides_with_epsilon(const Point &point) const;
@@ -93,6 +94,7 @@ class Pointf3 : public Pointf
     coordf_t z;
     explicit Pointf3(coordf_t _x = 0, coordf_t _y = 0, coordf_t _z = 0): Pointf(_x, _y), z(_z) {};
     void scale(double factor);
+    void translate(const Vectorf3 &vector);
     void translate(double x, double y, double z);
 };
 

xs/t/19_model.t

@@ -10,9 +10,9 @@ use Test::More tests => 4;
     my $model = Slic3r::Model->new;
     my $object = $model->_add_object;
     isa_ok $object, 'Slic3r::Model::Object::Ref';
-    isa_ok $object->origin_translation, 'Slic3r::Pointf::Ref';
-    $object->origin_translation->translate(10,0);
-    is_deeply \@{$object->origin_translation}, [10,0], 'origin_translation is modified by ref';
+    isa_ok $object->origin_translation, 'Slic3r::Pointf3::Ref';
+    $object->origin_translation->translate(10,0,0);
+    is_deeply \@{$object->origin_translation}, [10,0,0], 'origin_translation is modified by ref';
     
     my $lhr = [ [ 5, 10, 0.1 ] ];
     $object->set_layer_height_ranges($lhr);

xs/xsp/Model.xsp

@@ -188,9 +188,9 @@ ModelMaterial::attributes()
     void set_layer_height_ranges(t_layer_height_ranges ranges)
         %code%{ THIS->layer_height_ranges = ranges; %};
 
-    Ref<Pointf> origin_translation()
+    Ref<Pointf3> origin_translation()
         %code%{ RETVAL = &THIS->origin_translation; %};
-    void set_origin_translation(Pointf* point)
+    void set_origin_translation(Pointf3* point)
         %code%{ THIS->origin_translation = *point; %};
     
     bool needed_repair() const;