From d3ec1d7d28bb260340cb654dd6960f66df4b1d82 Mon Sep 17 00:00:00 2001
From: Remco Burema <r.burema@ultimaker.com>
Date: Fri, 9 Oct 2020 13:39:53 +0200
Subject: [PATCH] Cache wasn't valid due to a reference being stored, not a
 copy.

paer of CURA-7440
---
 cura/Scene/ConvexHullDecorator.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cura/Scene/ConvexHullDecorator.py b/cura/Scene/ConvexHullDecorator.py
index a4228ce422..36697b7c57 100644
--- a/cura/Scene/ConvexHullDecorator.py
+++ b/cura/Scene/ConvexHullDecorator.py
@@ -269,7 +269,7 @@ class ConvexHullDecorator(SceneNodeDecorator):
             if mesh is None:
                 return Polygon([])  # Node has no mesh data, so just return an empty Polygon.
 
-            world_transform = self._node.getWorldTransformation(copy = False)
+            world_transform = self._node.getWorldTransformation(copy = True)
 
             # Check the cache
             if mesh is self._2d_convex_hull_mesh and world_transform == self._2d_convex_hull_mesh_world_transform: