diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 4985e412b..36aa84db9 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -1001,7 +1001,7 @@ sub repaint {
     
     # draw skirt
     if (@{$parent->{object_previews}} && $parent->{config}->skirts) {
-        my $convex_hull = Slic3r::Polygon->new(@{convex_hull([ map @{$_->contour->pp}, map @{$_->[2]}, @{$parent->{object_previews}} ])});
+        my $convex_hull = convex_hull([ map @{$_->contour}, map @{$_->[2]}, @{$parent->{object_previews}} ]);
         ($convex_hull) = @{offset([$convex_hull], $parent->{config}->skirt_distance * $parent->{scaling_factor}, 100, JT_ROUND)};
         $dc->SetPen($parent->{skirt_pen});
         $dc->SetBrush($parent->{transparent_brush});
@@ -1289,7 +1289,7 @@ sub _trigger_model_object {
 	    
     	my $mesh = $model_object->mesh;
     	$mesh->repair;
-        $self->convex_hull(Slic3r::Geometry::convex_hull($mesh->vertices));
+        $self->convex_hull($mesh->convex_hull);
 	    $self->facets($mesh->facets_count);
 	    $self->vertices(scalar @{$mesh->vertices});
 	    $self->materials($model_object->materials_count);
diff --git a/xs/src/TriangleMesh.cpp b/xs/src/TriangleMesh.cpp
index 7c554b7e7..689bb7407 100644
--- a/xs/src/TriangleMesh.cpp
+++ b/xs/src/TriangleMesh.cpp
@@ -1,5 +1,6 @@
 #include "TriangleMesh.hpp"
 #include "ClipperUtils.hpp"
+#include "Geometry.hpp"
 #include <queue>
 #include <deque>
 #include <set>
@@ -598,6 +599,19 @@ TriangleMesh::horizontal_projection(ExPolygons &retval) const
     union_(pp, retval, true);
 }
 
+void
+TriangleMesh::convex_hull(Polygon &hull)
+{
+    if (this->stl.v_shared == NULL) stl_generate_shared_vertices(&(this->stl));
+    Points pp;
+    pp.reserve(this->stl.stats.shared_vertices);
+    for (int i = 0; i < this->stl.stats.shared_vertices; i++) {
+        stl_vertex* v = this->stl.v_shared;
+        pp.push_back(Point(v->x / SCALING_FACTOR, v->y / SCALING_FACTOR));
+    }
+    Slic3r::Geometry::convex_hull(pp, hull);
+}
+
 #ifdef SLIC3RXS
 SV*
 TriangleMesh::to_SV() {
diff --git a/xs/src/TriangleMesh.hpp b/xs/src/TriangleMesh.hpp
index 74f1605c8..06ecca273 100644
--- a/xs/src/TriangleMesh.hpp
+++ b/xs/src/TriangleMesh.hpp
@@ -33,6 +33,7 @@ class TriangleMesh
     TriangleMeshPtrs split() const;
     void merge(const TriangleMesh* mesh);
     void horizontal_projection(ExPolygons &retval) const;
+    void convex_hull(Polygon &hull);
     stl_file stl;
     bool repaired;
     
diff --git a/xs/xsp/TriangleMesh.xsp b/xs/xsp/TriangleMesh.xsp
index abee1f4ec..db98a633e 100644
--- a/xs/xsp/TriangleMesh.xsp
+++ b/xs/xsp/TriangleMesh.xsp
@@ -161,6 +161,16 @@ TriangleMesh::bb3()
     OUTPUT:
         RETVAL
 
+Polygon*
+TriangleMesh::convex_hull()
+    PREINIT:
+        const char* CLASS = "Slic3r::Polygon";
+    CODE:
+        RETVAL = new Polygon ();
+        THIS->convex_hull(*RETVAL);
+    OUTPUT:
+        RETVAL
+
 %}
 };