CarpetRegrid2: Correct another error in handling min_fraction

1 files changed, 5 insertions, 3 deletions

diff --git a/Carpet/CarpetRegrid2/src/property.cc b/Carpet/CarpetRegrid2/src/property.cc
index e7df4ea24..ac80721f5 100644
--- a/Carpet/CarpetRegrid2/src/property.cc
+++ b/Carpet/CarpetRegrid2/src/property.cc
@@ -202,10 +202,12 @@ namespace CarpetRegrid2 {
     CCTK_REAL const combined_size =
       static_cast <CCTK_REAL> (combined.size());
     
-    // Is the current setup simple enough? (It is "simple enough" if
-    // using a single bbox would be too inefficient.)
+    // Is the current setup "simple enough"? (It is "simple enough" if
+    // either it already consists of a single box, or if using a
+    // single bbox would be too inefficient.)
     // TODO: Check this also for pairs of regions
-    return min_fraction * combined_size > regions_size;
+    return (regions.at(rl).setsize() == 1 or
+            min_fraction * combined_size > regions_size);
   }
   
   void combine_regions::