From 28ebf77b8e00bdac6999967b5c828e54f76c93e6 Mon Sep 17 00:00:00 2001
From: rhaas <rhaas@082bdb00-0f4f-0410-b49e-b1835e5f2039>
Date: Tue, 1 May 2012 23:39:38 +0000
Subject: correct handling of tensorparity=-1 quantities during interpolation

this fixes https://trac.einsteintoolkit.org/ticket/254 and
https://trac.einsteintoolkit.org/ticket/851


git-svn-id: http://svn.cactuscode.org/arrangements/CactusNumerical/ReflectionSymmetry/trunk@48 082bdb00-0f4f-0410-b49e-b1835e5f2039
---
 src/interpolate.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/interpolate.c b/src/interpolate.c
index fcaa51a..8c1f61b 100644
--- a/src/interpolate.c
+++ b/src/interpolate.c
@@ -297,7 +297,7 @@ ReflectionSymmetry_Interpolate (CCTK_POINTER_TO_CONST restrict const cctkGH_,
         assert (groupname);
         CCTK_VWarn (0, __LINE__, __FILE__, CCTK_THORNSTRING,
                     "Illegal tensor type alias \"%s\" for group \"%s\"", 
-                    tensortypealias, groupname);
+		    tensortypealias, groupname);
         free (groupname);
       }
       
@@ -434,23 +434,24 @@ ReflectionSymmetry_Interpolate (CCTK_POINTER_TO_CONST restrict const cctkGH_,
       /* Are there negative parities? */
       needs_checking = 0;
       for (dir=0; dir<3; ++dir) {
-        check_dir[dir] = do_reflection[2*dir] && parities[dir] < 0;
+        check_dir[dir] = do_reflection[2*dir] && parities[dir]*tensorparity < 0;
         needs_checking |= check_dir[dir];
       }
+
       
       
       
       /* Loop over all points and unfold */
       if (needs_checking) {
         for (n=0; n<N_interp_points; ++n) {
-          int parity = tensorparity;
+          int parity = 1; /* all types have their "natural" sign in the +++ octant */
           /* Is the point outside the domain? */
           for (dir=0; dir<3; ++dir) {
             if (check_dir[dir]) {
               CCTK_REAL const pos = ((CCTK_REAL const *)interp_coords[dir])[n];
               if (pos < 0) {
                 /* Reflect the tensor component */
-                parity *= -1;
+                parity *= -1; /* we only get here if parities[dir]*tensorparity < 0 */
               }
             }
           }
-- 
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