CarpetRegrid2: Correct min_fraction

A condition was reversed, inverting the meaning of min_fraction, possibly leading to quite inefficient grid structures.

1 files changed, 3 insertions, 2 deletions

diff --git a/Carpet/CarpetRegrid2/src/property.cc b/Carpet/CarpetRegrid2/src/property.cc
index a568e82d9..e7df4ea24 100644
--- a/Carpet/CarpetRegrid2/src/property.cc
+++ b/Carpet/CarpetRegrid2/src/property.cc
@@ -202,9 +202,10 @@ namespace CarpetRegrid2 {
     CCTK_REAL const combined_size =
       static_cast <CCTK_REAL> (combined.size());
     
-    // Would a single bbox be efficient enough?
+    // Is the current setup simple enough? (It is "simple enough" 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 min_fraction * combined_size > regions_size;
   }
   
   void combine_regions::