Define WARPX_ZINDEX to denote the index for the Z dimension regardless of the build's dimensionality (#2622)

* Define WARPX_ZINDEX to denote the index for the Z dimension regardless of the build's dimensionality

* Add WARPX_ZINDEX macro definition to Makefile as well

1 files changed, 1 insertions, 1 deletions

diff --git a/Source/Parallelization/GuardCellManager.cpp b/Source/Parallelization/GuardCellManager.cpp
index 92eaa9c85..2fa0c4c4a 100644
--- a/Source/Parallelization/GuardCellManager.cpp
+++ b/Source/Parallelization/GuardCellManager.cpp
@@ -284,7 +284,7 @@ guardCellManager::Init (
         // If NCI filter, add guard cells in the z direction
         IntVect ng_NCIFilter = IntVect::TheZeroVector();
         if (do_fdtd_nci_corr)
-            ng_NCIFilter[AMREX_SPACEDIM-1] = NCIGodfreyFilter::m_stencil_width;
+            ng_NCIFilter[WARPX_ZINDEX] = NCIGodfreyFilter::m_stencil_width;
         // Note: communications of guard cells for bilinear filter are handled
         // separately.
         ng_FieldGather = ng_FieldGather_noNCI + ng_NCIFilter;