From b327314b0265cfa14a865a44224773e50168552c Mon Sep 17 00:00:00 2001
From: Vojtech Bubnik <bubnikv@gmail.com>
Date: Thu, 29 Apr 2021 11:05:11 +0200
Subject: [PATCH] Layer::make_perimeters() - when merging regions, use OffsetEx
 instead of safety offset of UnionEx, which may not be robust.

---
 src/libslic3r/Layer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libslic3r/Layer.cpp b/src/libslic3r/Layer.cpp
index b974ff217..e86a67b6f 100644
--- a/src/libslic3r/Layer.cpp
+++ b/src/libslic3r/Layer.cpp
@@ -185,7 +185,7 @@ void Layer::make_perimeters()
 	                }
 	                // merge the surfaces assigned to each group
 	                for (std::pair<const unsigned short,Surfaces> &surfaces_with_extra_perimeters : slices)
-	                    new_slices.append(union_ex(surfaces_with_extra_perimeters.second, true), surfaces_with_extra_perimeters.second.front());
+	                    new_slices.append(offset_ex(to_expolygons(surfaces_with_extra_perimeters.second), 10.f), surfaces_with_extra_perimeters.second.front());
 	            }
 	            
 	            // make perimeters