From bcdcec1dc0812fd1d765d135c50b02fc9a742fb5 Mon Sep 17 00:00:00 2001
From: Michael Kirsch <mkirsch.git@gmail.com>
Date: Sun, 26 May 2019 21:40:41 +0200
Subject: [PATCH] fix face to plane

---
 lib/Slic3r/GUI/Plater.pm | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 4220524be..52d3de697 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -1646,8 +1646,23 @@ sub rotate_face {
         }
     }
 
-    $object->rotate_vec_to_vec($normal,$axis_vec);
+    my $model_object = $self->{model}->objects->[$obj_idx];
+    my $model_instance = $model_object->instances->[0];
 
+    $model_object->transform_by_instance($model_instance, 1);
+    $model_object->rotate_vec_to_vec($normal,$axis_vec);
+
+    # realign object to Z = 0
+    $model_object->center_around_origin;
+    $self->make_thumbnail($obj_idx);
+
+    $model_object->update_bounding_box;
+    # update print and start background processing
+    $self->{print}->add_model_object($model_object, $obj_idx);
+
+    $self->selection_changed;  # refresh info (size etc.)
+    $self->on_model_change;
+    
     #TODO: undo stack
 }