From 63458b4c2b83988da2259dab7456b705c731ce85 Mon Sep 17 00:00:00 2001
From: Nils Schmidt <nilsschmidt1337@users.noreply.github.com>
Date: Mon, 19 Aug 2024 21:03:16 +0200
Subject: [PATCH] Fixed issue #624.

---
 src/org/nschmidt/csg/CSG.java | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/org/nschmidt/csg/CSG.java b/src/org/nschmidt/csg/CSG.java
index 4babc97b..b628496b 100644
--- a/src/org/nschmidt/csg/CSG.java
+++ b/src/org/nschmidt/csg/CSG.java
@@ -211,10 +211,11 @@ public CSG union(CSG csg) {
             throw new LDPartEditorException(ie);
         }
 
-        final List<Polygon> polygons = new ArrayList<>(c1.polygons);
-        polygons.addAll(c2.polygons);
+        final List<Polygon> unifiedPolygons = new ArrayList<>(c1.polygons.size() + c2.polygons.size());
+        unifiedPolygons.addAll(c1.polygons);
+        unifiedPolygons.addAll(c2.polygons);
 
-        return CSG.fromPolygons(polygons);
+        return CSG.fromPolygons(unifiedPolygons);
     }
 
     /**