From 1fdc4c39dce43a86bab11a4766151e046c7d62ea Mon Sep 17 00:00:00 2001
From: osae <osae@iris.no>
Date: Fri, 11 Sep 2015 11:47:27 +0200
Subject: [PATCH] Assure 4 vertices for each face of the grid.

---
 opm/core/grid/GridHelpers.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/opm/core/grid/GridHelpers.cpp b/opm/core/grid/GridHelpers.cpp
index afbaf9b4..e8d268a2 100644
--- a/opm/core/grid/GridHelpers.cpp
+++ b/opm/core/grid/GridHelpers.cpp
@@ -70,6 +70,7 @@ double cellCenterDepth(const UnstructuredGrid& grid, int cell_index)
     // Traverse the bottom and top cell-face
     for (int i=grid.cell_facepos[cell_index+1]-2; i<grid.cell_facepos[cell_index+1]; ++i) {
         // Traverse the vertices associated with each face
+        assert(grid.face_nodepos[grid.cell_faces[i]+1] - grid.face_nodepos[grid.cell_faces[i]] == nv/2);
         for (int j=grid.face_nodepos[grid.cell_faces[i]]; j<grid.face_nodepos[grid.cell_faces[i]+1]; ++j) {
             zz += (grid.node_coordinates+nd*(grid.face_nodes[j]))[nd-1];
         }