From f429b568bb8948066a416a766dbe70e2318d78de Mon Sep 17 00:00:00 2001
From: mwganson <mwganson@gmail.com>
Date: Sun, 19 Jul 2020 14:51:30 -0500
Subject: [PATCH] [openscad] add icon for mirror mesh feature

---
 src/Mod/OpenSCAD/OpenSCADCommands.py    | 8 ++++++--
 src/Mod/OpenSCAD/OpenSCADUtils.py       | 2 +-
 src/Mod/OpenSCAD/Resources/OpenSCAD.qrc | 3 ++-
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/Mod/OpenSCAD/OpenSCADCommands.py b/src/Mod/OpenSCAD/OpenSCADCommands.py
index 99f17bffde..afb4d7f850 100644
--- a/src/Mod/OpenSCAD/OpenSCADCommands.py
+++ b/src/Mod/OpenSCAD/OpenSCADCommands.py
@@ -168,8 +168,12 @@ class MirrorMeshFeature:
             newobj=selobj.Document.addObject("Mesh::Feature",'mirror')
             newobj.Label='mirror_%s' % selobj.Object.Label
             msh=selobj.Object.Mesh
-            newobj.Mesh=OpenSCADUtils.mirror(msh)
-            selobj.Object.ViewObject.hide()
+            newmesh=OpenSCADUtils.mirror(msh)
+            if not newmesh:
+                selobj.Document.removeObject(newobj.Name)
+            else:
+                newobj.Mesh=newmesh
+                selobj.Object.ViewObject.hide()
         FreeCAD.ActiveDocument.recompute()
     def GetResources(self):
         return {'Pixmap'  : 'OpenSCAD_MirrorMeshFeature',
diff --git a/src/Mod/OpenSCAD/OpenSCADUtils.py b/src/Mod/OpenSCAD/OpenSCADUtils.py
index 22dc486426..080a6b52e0 100644
--- a/src/Mod/OpenSCAD/OpenSCADUtils.py
+++ b/src/Mod/OpenSCAD/OpenSCADUtils.py
@@ -309,7 +309,7 @@ def mirror(msh):
         mi = callopenscadmeshstring('%s{%s}' % (param,''.join(poly)))
         mi.flipNormals()
         return mi
-    return msh
+    return None
 
 
 def angneg(d):
diff --git a/src/Mod/OpenSCAD/Resources/OpenSCAD.qrc b/src/Mod/OpenSCAD/Resources/OpenSCAD.qrc
index 52e78016d5..0b8290ed24 100644
--- a/src/Mod/OpenSCAD/Resources/OpenSCAD.qrc
+++ b/src/Mod/OpenSCAD/Resources/OpenSCAD.qrc
@@ -1,5 +1,5 @@
 <RCC>
-    <qresource>
+    <qresource prefix="/">
         <file>icons/preferences-openscad.svg</file>
         <file>icons/OpenSCAD_AddOpenSCADElement.svg</file>
         <file>icons/OpenSCAD_ColorCodeShape.svg</file>
@@ -50,5 +50,6 @@
         <file>translations/OpenSCAD_val-ES.qm</file>
         <file>translations/OpenSCAD_ar.qm</file>
         <file>translations/OpenSCAD_vi.qm</file>
+        <file>icons/OpenSCAD_MirrorMeshFeature.svg</file>
     </qresource>
 </RCC>