From 63f13467af231b60e20d6d00849298c44f3b1e4c Mon Sep 17 00:00:00 2001
From: Daniel Cornelius <Kerfuffles@users.noreply.github.com>
Date: Thu, 14 Apr 2022 17:12:12 -0500
Subject: [PATCH] fix for #345

---
 .../Managers/InternalCSGModelManager.Lifetime.cs      | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/Plugins/Editor/Scripts/Control/Managers/InternalCSGModelManager.Lifetime.cs b/Plugins/Editor/Scripts/Control/Managers/InternalCSGModelManager.Lifetime.cs
index bd67e35..f759c25 100644
--- a/Plugins/Editor/Scripts/Control/Managers/InternalCSGModelManager.Lifetime.cs
+++ b/Plugins/Editor/Scripts/Control/Managers/InternalCSGModelManager.Lifetime.cs
@@ -1,14 +1,6 @@
-using System;
-using System.Collections.Generic;
 using UnityEngine;
-using System.Linq;
-using UnityEngine.SceneManagement;
-using UnityEditor.SceneManagement;
 using UnityEditor;
 using InternalRealtimeCSG;
-using System.Reflection;
-using UnityEngine.Rendering;
-using System.Runtime.InteropServices;
 
 namespace RealtimeCSG
 {
@@ -20,6 +12,9 @@ internal partial class InternalCSGModelManager
 		internal static NativeMethods External;
 
 		#region Clear
+    #if UNITY_2019_4_OR_NEWER
+        [RuntimeInitializeOnLoadMethod( RuntimeInitializeLoadType.SubsystemRegistration )]        
+#endif
 		public static void Clear()
 		{
 			BrushOutlineManager.ClearOutlines();