From 2a31e00148f2dec582196dc07a66672d4a99a450 Mon Sep 17 00:00:00 2001
From: Christopher Lackner <christopher.lackner@tuwien.ac.at>
Date: Tue, 12 Jun 2018 10:34:13 +0200
Subject: [PATCH] return 0 based periodic vertices in new interface

---
 libsrc/include/nginterface_v2_impl.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libsrc/include/nginterface_v2_impl.hpp b/libsrc/include/nginterface_v2_impl.hpp
index b866f812..938efbf8 100644
--- a/libsrc/include/nginterface_v2_impl.hpp
+++ b/libsrc/include/nginterface_v2_impl.hpp
@@ -301,6 +301,11 @@ NGX_INLINE DLL_HEADER Ng_Buffer<int[2]> Ngx_Mesh :: GetPeriodicVertices(int idnr
 {
   Array<INDEX_2> apairs;
   mesh->GetIdentifications().GetPairs (idnr, apairs);
+  for(auto& ind : apairs)
+    {
+      ind.I1()--;
+      ind.I2()--;
+    }
   typedef int ti2[2];
   return { apairs.Size(), (ti2*)(void*)apairs.Release() };
 }