From ea0b6f2948afa16b9cd73bc7bbba70a2464fb34d Mon Sep 17 00:00:00 2001
From: pshriwise <pshriwise@gmail.com>
Date: Sun, 30 Sep 2018 02:50:56 +0000
Subject: [PATCH] Skipping geometry write, but indicating a DAGMC geometry was
 used for now.

---
 openmc/summary.py | 18 +++++++++++-------
 src/summary.cpp   | 12 ++++++++----
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/openmc/summary.py b/openmc/summary.py
index 10898290a..a54e8ebbf 100644
--- a/openmc/summary.py
+++ b/openmc/summary.py
@@ -97,13 +97,17 @@ class Summary(object):
                 self._macroscopics = name.decode()
 
     def _read_geometry(self):
-        # Read in and initialize the Materials and Geometry
-        self._read_materials()
-        self._read_surfaces()
-        cell_fills = self._read_cells()
-        self._read_universes()
-        self._read_lattices()
-        self._finalize_geometry(cell_fills)
+        try:
+            self._f['geometry'].attrs.get("cad")
+            return
+        except:
+            # Read in and initialize the Materials and Geometry
+            self._read_materials()
+            self._read_surfaces()
+            cell_fills = self._read_cells()
+            self._read_universes()
+            self._read_lattices()
+            self._finalize_geometry(cell_fills)
 
     def _read_materials(self):
         for group in self._f['materials'].values():
diff --git a/src/summary.cpp b/src/summary.cpp
index 7a0c4324a..eaedd21dd 100644
--- a/src/summary.cpp
+++ b/src/summary.cpp
@@ -9,11 +9,15 @@ namespace openmc {
 extern "C" void
 write_geometry(hid_t file_id) {
 
-#ifdef DAGMC
-  if (settings::dagmc) return;
-#endif
-  
   auto geom_group = create_group(file_id, "geometry");
+  
+#ifdef DAGMC
+  if (settings::dagmc) {
+    write_attribute(geom_group, "cad", 1);
+    return;
+  }
+#endif
+
   write_attribute(geom_group, "n_cells", cells.size());
   write_attribute(geom_group, "n_surfaces", surfaces.size());
   write_attribute(geom_group, "n_universes", universes.size());