From 2c8e49bcf562b75e8ff1576c664cb7600b28e158 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Mon, 24 Jan 2022 12:01:40 -0700
Subject: [PATCH] Un-hardcode some numbers.

---
 source/grid/tria.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/source/grid/tria.cc b/source/grid/tria.cc
index 77845fcc54..3547f45123 100644
--- a/source/grid/tria.cc
+++ b/source/grid/tria.cc
@@ -5108,23 +5108,26 @@ namespace internal
                  triangulation.active_cell_iterators_on_level(level))
               if (cell->refine_flag_set())
                 {
+                  // Only support isotropic refinement
                   Assert(cell->refine_flag_set() ==
                            RefinementCase<dim>::cut_xyz,
                          ExcInternalError());
 
+                  // Now count up how many new cells, faces, edges, and vertices
+                  // we will need to allocate to do this refinement.
+                  new_cells += cell->reference_cell().n_isotropic_children();
+
                   if (cell->reference_cell() == ReferenceCells::Hexahedron)
                     {
                       ++needed_vertices;
                       needed_lines_single += 6;
                       needed_quads_single += 12;
-                      new_cells += 8;
                     }
                   else if (cell->reference_cell() ==
                            ReferenceCells::Tetrahedron)
                     {
                       needed_lines_single += 1;
                       needed_quads_single += 8;
-                      new_cells += 8;
                     }
                   else
                     {
-- 
2.39.5