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-rw-r--r--interface.ccl21
1 files changed, 13 insertions, 8 deletions
diff --git a/interface.ccl b/interface.ccl
index 6546fd4..4c683c1 100644
--- a/interface.ccl
+++ b/interface.ccl
@@ -44,14 +44,19 @@ CCTK_INT FUNCTION HorizonLocalCoordinateOrigin \
CCTK_INT FUNCTION HorizonWasFound(CCTK_INT IN horizon_number)
#
-# The following function computes the horizon radius in the
-# direction of each (x,y,z) point, or -1.0 if this horizon wasn't found
-# the most recent time AHFinderDirect searched for it. More precisely,
-# For each (x,y,z), consider the ray from the local coordinate origin
-# through (x,y,z). This function computes the Euclidean distance
-# between the local coordinate origin and this ray's intersection with
-# the horizon, or -1.0 if this horizon wasn't found the most recent time
-# AHFinderDirect searched for it.
+# The following function computes the horizon radius in the direction
+# of each (x,y,z) point, or -1.0 if this horizon wasn't found the most
+# recent time AHFinderDirect searched for it. More precisely, for each
+# (x,y,z), consider the ray from the local coordinate origin through
+# (x,y,z). This function computes the Euclidean distance between the
+# local coordinate origin and this ray's intersection with the horizon,
+# or -1.0 if this horizon wasn't found the most recent time AHFinderDirect
+# searched for it.
+#
+# If this function is to be used in a multiprocessor run on a horizon
+# which was found on some other processor, the parameter
+# AHFinderDirect::always_broadcast_horizon_shape
+# must be set to true to get the correct answer.
#
CCTK_INT FUNCTION HorizonRadiusInDirection \
(CCTK_INT IN horizon_number, \