From 9602e22c3d63d8a2f217c82b2896785dca1d938f Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sat, 11 Aug 2018 14:36:50 +0200
Subject: [PATCH] compute the actual placement to apply instead of transforming
 the points twice

---
 src/Mod/Mesh/App/Exporter.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/Mod/Mesh/App/Exporter.cpp b/src/Mod/Mesh/App/Exporter.cpp
index 5b839c1044..b921828c9c 100644
--- a/src/Mod/Mesh/App/Exporter.cpp
+++ b/src/Mod/Mesh/App/Exporter.cpp
@@ -183,7 +183,6 @@ bool MergeExporter::addPartFeat(App::DocumentObject *obj, float tol)
             App::GeoFeature* gf = static_cast<App::GeoFeature*>(obj);
             Base::Placement plm = gf->globalPlacement();
             Base::Placement pl  = gf->Placement.getValue();
-            Base::Placement plInverse = pl.inverse();
             bool applyGlobal = false;
             if (pl == plm) {
                //no extension placement
@@ -198,9 +197,9 @@ bool MergeExporter::addPartFeat(App::DocumentObject *obj, float tol)
             geoData->getFaces(aPoints, aTopo, tol);
 
             if (applyGlobal) {
+                Base::Placement diff_plm = plm * pl.inverse();
                 for (auto& it : aPoints) {
-                    plInverse.multVec(it,it);
-                    plm.multVec(it, it);
+                    diff_plm.multVec(it,it);
                 }
             }