From c4f95ec7e2dda0a1ba4f55bc88ba4736ea3b5bc4 Mon Sep 17 00:00:00 2001
From: Mikko Mononen <memononen@gmail.com>
Date: Sun, 3 Jul 2011 11:49:16 +0000
Subject: [PATCH] Fix for issue 174.

---
 Recast/Source/RecastFilter.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Recast/Source/RecastFilter.cpp b/Recast/Source/RecastFilter.cpp
index d01808a..66af37a 100644
--- a/Recast/Source/RecastFilter.cpp
+++ b/Recast/Source/RecastFilter.cpp
@@ -38,6 +38,7 @@ void rcFilterLowHangingWalkableObstacles(rcContext* ctx, const int walkableClimb
 		{
 			rcSpan* ps = 0;
 			bool previousWalkable = false;
+			unsigned char previousArea = RC_NULL_AREA;
 			
 			for (rcSpan* s = solid.spans[x + y*w]; s; ps = s, s = s->next)
 			{
@@ -47,11 +48,12 @@ void rcFilterLowHangingWalkableObstacles(rcContext* ctx, const int walkableClimb
 				if (!walkable && previousWalkable)
 				{
 					if (rcAbs((int)s->smax - (int)ps->smax) <= walkableClimb)
-						s->area = RC_NULL_AREA;
+						s->area = previousArea;
 				}
 				// Copy walkable flag so that it cannot propagate
 				// past multiple non-walkable objects.
 				previousWalkable = walkable;
+				previousArea = s->area;
 			}
 		}
 	}