From 651a4d7626bbef077ce39a686df88f83ddcd8908 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sun, 12 Dec 2021 01:15:56 +0100
Subject: [PATCH] Part: set explicit format version number for binary BRep
 files to support all OCC versions

---
 src/Mod/Part/App/TopoShape.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/Mod/Part/App/TopoShape.cpp b/src/Mod/Part/App/TopoShape.cpp
index f3c11745b7..4f03ee5610 100644
--- a/src/Mod/Part/App/TopoShape.cpp
+++ b/src/Mod/Part/App/TopoShape.cpp
@@ -1050,8 +1050,17 @@ void TopoShape::exportBrep(std::ostream& out) const
 
 void TopoShape::exportBinary(std::ostream& out)
 {
+    // See BinTools_FormatVersion of OCCT 7.6
+    enum {
+        VERSION_1 = 1,
+        VERSION_2 = 2,
+        VERSION_3 = 3,
+        VERSION_4 = 4
+    };
+
     // An example how to use BinTools_ShapeSet can be found in BinMNaming_NamedShapeDriver.cxx
     BinTools_ShapeSet theShapeSet;
+    theShapeSet.SetFormatNb(VERSION_3);
     if (this->_Shape.IsNull()) {
         theShapeSet.Add(this->_Shape);
         theShapeSet.Write(out);