From 79ce094e3afcf5ded39cb203f8ffd01cdb1dd0e5 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sun, 3 May 2015 18:28:39 +0200
Subject: [PATCH] Bugfix: splitting a rotated object resulted in wrong
 positions. #2772

---
 xs/src/libslic3r/Model.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/xs/src/libslic3r/Model.cpp b/xs/src/libslic3r/Model.cpp
index 6fafe9bf0..fc9f39b3f 100644
--- a/xs/src/libslic3r/Model.cpp
+++ b/xs/src/libslic3r/Model.cpp
@@ -482,7 +482,12 @@ ModelObject::center_around_origin()
     
     if (!this->instances.empty()) {
         for (ModelInstancePtrs::const_iterator i = this->instances.begin(); i != this->instances.end(); ++i) {
-            (*i)->offset.translate(-vector.x, -vector.y);
+            // apply rotation and scaling to vector as well before translating instance,
+            // in order to leave final position unaltered
+            Vectorf3 v = vector.negative();
+            v.rotate(Slic3r::Geometry::deg2rad((*i)->rotation), (*i)->offset);
+            v.scale((*i)->scaling_factor);
+            (*i)->offset.translate(v.x, v.y);
         }
         this->update_bounding_box();
     }