From f2b6c07e2d91860560fd35bd055b50239fd30b04 Mon Sep 17 00:00:00 2001
From: Richard Pringle <richard.pringle@gmail.com>
Date: Mon, 30 Aug 2021 12:03:42 +0800
Subject: [PATCH] Release references to solids once merged.

---
 Csg/Solid.cs | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/Csg/Solid.cs b/Csg/Solid.cs
index 3125a4f..3d30297 100644
--- a/Csg/Solid.cs
+++ b/Csg/Solid.cs
@@ -36,16 +36,22 @@ public static Solid FromPolygons(List<Polygon> polygons)
 
 		public Solid Union(params Solid[] others)
 		{
-			var csgs = new List<Solid>();
-			csgs.Add(this);
-			csgs.AddRange(others);
-			var i = 1;
-			for (; i < csgs.Count; i += 2)
+			if (others.Length == 0) {
+				return this;
+			}
+
+			var csgs = new Queue<Solid>(others);
+			csgs.Enqueue (this);
+			while (csgs.Count > 1) 
 			{
-				var n = csgs[i - 1].UnionSub(csgs[i], false, false);
-				csgs.Add(n);
+				var a = csgs.Dequeue();
+				var b = csgs.Dequeue();
+
+				var n = a.UnionSub(b, false, false);
+				csgs.Enqueue(n);
 			}
-			return csgs[i - 1].Retesselated().Canonicalized();
+
+			return csgs.Dequeue().Retesselated().Canonicalized();
 		}
 
 		Solid UnionSub(Solid csg, bool retesselate, bool canonicalize)