From 5e5af56635ca5d8fefbd054dfdadb9d15399b84c Mon Sep 17 00:00:00 2001
From: Vojtech Bubnik <bubnikv@gmail.com>
Date: Tue, 11 Apr 2023 10:21:55 +0200
Subject: [PATCH] Tiny optimization in RegionExpansion wave_seeds() for empty
 input

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

diff --git a/src/libslic3r/Algorithm/RegionExpansion.cpp b/src/libslic3r/Algorithm/RegionExpansion.cpp
index 844cda822..e36f5e62c 100644
--- a/src/libslic3r/Algorithm/RegionExpansion.cpp
+++ b/src/libslic3r/Algorithm/RegionExpansion.cpp
@@ -206,7 +206,7 @@ std::vector<WaveSeed> wave_seeds(
 {
     assert(tiny_expansion > 0);
 
-    if (src.empty())
+    if (src.empty() || boundary.empty())
         return {};
 
     using Intersection  = ClipperZUtils::ClipperZIntersectionVisitor::Intersection;