From 0408fb771e9b2d93672c80d3fe7b1ec715eddf38 Mon Sep 17 00:00:00 2001
From: abn <adrien.bruneton@cea.fr>
Date: Wed, 16 Sep 2015 17:00:45 +0200
Subject: [PATCH] buildInnerBoundaryAlongM1Group(): family ID creation was
 buggy.

---
 src/MEDLoader/MEDFileMesh.cxx | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/MEDLoader/MEDFileMesh.cxx b/src/MEDLoader/MEDFileMesh.cxx
index b77e3416d..d94dda94b 100644
--- a/src/MEDLoader/MEDFileMesh.cxx
+++ b/src/MEDLoader/MEDFileMesh.cxx
@@ -3650,7 +3650,13 @@ void MEDFileUMesh::buildInnerBoundaryAlongM1Group(const std::string& grpNameM1,
     throw INTERP_KERNEL::Exception("MEDFileUMesh::buildInnerBoundaryAlongM1Group : internal problem !");
   MEDCouplingAutoRefCountObjectPtr<DataArrayInt> newFam=DataArrayInt::New();
   newFam->alloc(newm1->getNumberOfCells(),1);
-  int idd=getMaxFamilyId()+1;
+  // Get a new family ID: care must be taken if we need a positive ID or a negative one:
+  // Positive ID for family of nodes, negative for all the rest.
+  int idd;
+  if (m1->getMeshDimension() == 0)
+    idd=getMaxFamilyId()+1;
+  else
+    idd=getMinFamilyId()-1;
   int globStart=0,start=0,end,globEnd;
   int nbOfChunks=szOfCellGrpOfSameType->getNumberOfTuples();
   for(int i=0;i<nbOfChunks;i++)
-- 
2.39.2