diff --git a/DetourTileCache/Include/DetourTileCache.h b/DetourTileCache/Include/DetourTileCache.h
index c45910c..aba0c13 100644
--- a/DetourTileCache/Include/DetourTileCache.h
+++ b/DetourTileCache/Include/DetourTileCache.h
@@ -38,7 +38,8 @@ enum ObstacleState
 enum ObstacleType
 {
 	DT_OBSTACLE_CYLINDER,
-	DT_OBSTACLE_BOX,
+	DT_OBSTACLE_BOX, // AABB
+	DT_OBSTACLE_ORIENTED_BOX, // OBB
 };
 
 struct dtObstacleCylinder
@@ -54,6 +55,13 @@ struct dtObstacleBox
 	float bmax[ 3 ];
 };
 
+struct dtObstacleOrientedBox
+{
+	float center[ 3 ];
+	float extents[ 3 ];
+	float rotAux[ 2 ]; //{ cos(0.5f*angle)*sin(-0.5f*angle); cos(0.5f*angle)*cos(0.5f*angle) - 0.5 }
+};
+
 static const int DT_MAX_TOUCHED_TILES = 8;
 struct dtTileCacheObstacle
 {
@@ -61,6 +69,7 @@ struct dtTileCacheObstacle
 	{
 		dtObstacleCylinder cylinder;
 		dtObstacleBox box;
+		dtObstacleOrientedBox orientedBox;
 	};
 
 	dtCompressedTileRef touched[DT_MAX_TOUCHED_TILES];
@@ -130,8 +139,14 @@ public:
 	
 	dtStatus removeTile(dtCompressedTileRef ref, unsigned char** data, int* dataSize);
 	
+	// Cylinder obstacle.
 	dtStatus addObstacle(const float* pos, const float radius, const float height, dtObstacleRef* result);
+
+	// Aabb obstacle.
 	dtStatus addBoxObstacle(const float* bmin, const float* bmax, dtObstacleRef* result);
+
+	// Box obstacle: can be rotated in Y.
+	dtStatus addBoxObstacle(const float* center, const float* extents, const float yRadians, dtObstacleRef* result);
 	
 	dtStatus removeObstacle(const dtObstacleRef ref);
 	
diff --git a/DetourTileCache/Include/DetourTileCacheBuilder.h b/DetourTileCache/Include/DetourTileCacheBuilder.h
index d1ef80e..7b95abc 100644
--- a/DetourTileCache/Include/DetourTileCacheBuilder.h
+++ b/DetourTileCache/Include/DetourTileCacheBuilder.h
@@ -130,6 +130,9 @@ dtStatus dtMarkCylinderArea(dtTileCacheLayer& layer, const float* orig, const fl
 dtStatus dtMarkBoxArea(dtTileCacheLayer& layer, const float* orig, const float cs, const float ch,
 					   const float* bmin, const float* bmax, const unsigned char areaId);
 
+dtStatus dtMarkBoxArea(dtTileCacheLayer& layer, const float* orig, const float cs, const float ch,
+					   const float* center, const float* extents, const float* rotAux, const unsigned char areaId);
+
 dtStatus dtBuildTileCacheRegions(dtTileCacheAlloc* alloc,
 								 dtTileCacheLayer& layer,
 								 const int walkableClimb);
diff --git a/DetourTileCache/Source/DetourTileCache.cpp b/DetourTileCache/Source/DetourTileCache.cpp
index cf57504..1b152df 100644
--- a/DetourTileCache/Source/DetourTileCache.cpp
+++ b/DetourTileCache/Source/DetourTileCache.cpp
@@ -420,6 +420,45 @@ dtStatus dtTileCache::addBoxObstacle(const float* bmin, const float* bmax, dtObs
 	return DT_SUCCESS;
 }
 
+dtStatus dtTileCache::addBoxObstacle(const float* center, const float* extents, const float yRadians, dtObstacleRef* result)
+{
+	if (m_nreqs >= MAX_REQUESTS)
+		return DT_FAILURE | DT_BUFFER_TOO_SMALL;
+
+	dtTileCacheObstacle* ob = 0;
+	if (m_nextFreeObstacle)
+	{
+		ob = m_nextFreeObstacle;
+		m_nextFreeObstacle = ob->next;
+		ob->next = 0;
+	}
+	if (!ob)
+		return DT_FAILURE | DT_OUT_OF_MEMORY;
+
+	unsigned short salt = ob->salt;
+	memset(ob, 0, sizeof(dtTileCacheObstacle));
+	ob->salt = salt;
+	ob->state = DT_OBSTACLE_PROCESSING;
+	ob->type = DT_OBSTACLE_ORIENTED_BOX;
+	dtVcopy(ob->orientedBox.center, center);
+	dtVcopy(ob->orientedBox.extents, extents);
+
+	float coshalf= cosf(0.5f*yRadians);
+	float sinhalf = sinf(-0.5f*yRadians);
+	ob->orientedBox.rotAux[0] = coshalf*sinhalf;
+	ob->orientedBox.rotAux[1] = coshalf*coshalf - 0.5f;
+
+	ObstacleRequest* req = &m_reqs[m_nreqs++];
+	memset(req, 0, sizeof(ObstacleRequest));
+	req->action = REQUEST_ADD;
+	req->ref = getObstacleRef(ob);
+
+	if (result)
+		*result = req->ref;
+
+	return DT_SUCCESS;
+}
+
 dtStatus dtTileCache::removeObstacle(const dtObstacleRef ref)
 {
 	if (!ref)
@@ -650,7 +689,12 @@ dtStatus dtTileCache::buildNavMeshTile(const dtCompressedTileRef ref, dtNavMesh*
 			else if (ob->type == DT_OBSTACLE_BOX)
 			{
 				dtMarkBoxArea(*bc.layer, tile->header->bmin, m_params.cs, m_params.ch,
-							ob->box.bmin, ob->box.bmax, 0);
+					ob->box.bmin, ob->box.bmax, 0);
+			}
+			else if (ob->type == DT_OBSTACLE_ORIENTED_BOX)
+			{
+				dtMarkBoxArea(*bc.layer, tile->header->bmin, m_params.cs, m_params.ch,
+					ob->orientedBox.center, ob->orientedBox.extents, ob->orientedBox.rotAux, 0);
 			}
 		}
 	}
@@ -761,4 +805,16 @@ void dtTileCache::getObstacleBounds(const struct dtTileCacheObstacle* ob, float*
 		dtVcopy(bmin, ob->box.bmin);
 		dtVcopy(bmax, ob->box.bmax);
 	}
+	else if (ob->type == DT_OBSTACLE_ORIENTED_BOX)
+	{
+		const dtObstacleOrientedBox &orientedBox = ob->orientedBox;
+
+		float maxr = 1.41f*dtMax(orientedBox.extents[0], orientedBox.extents[2]);
+		bmin[0] = orientedBox.center[0] - maxr;
+		bmax[0] = orientedBox.center[0] + maxr;
+		bmin[1] = orientedBox.center[1] - orientedBox.extents[1];
+		bmax[1] = orientedBox.center[1] + orientedBox.extents[1];
+		bmin[2] = orientedBox.center[2] - maxr;
+		bmax[2] = orientedBox.center[2] + maxr;
+	}
 }
diff --git a/DetourTileCache/Source/DetourTileCacheBuilder.cpp b/DetourTileCache/Source/DetourTileCacheBuilder.cpp
index a81a7b4..56ee134 100644
--- a/DetourTileCache/Source/DetourTileCacheBuilder.cpp
+++ b/DetourTileCache/Source/DetourTileCacheBuilder.cpp
@@ -2041,6 +2041,60 @@ dtStatus dtMarkBoxArea(dtTileCacheLayer& layer, const float* orig, const float c
 	return DT_SUCCESS;
 }
 
+dtStatus dtMarkBoxArea(dtTileCacheLayer& layer, const float* orig, const float cs, const float ch,
+					   const float* center, const float* extents, const float* rotAux, const unsigned char areaId)
+{
+	const int w = (int)layer.header->width;
+	const int h = (int)layer.header->height;
+	const float ics = 1.0f/cs;
+	const float ich = 1.0f/ch;
+
+	float cx = (center[0] - orig[0])*ics;
+	float cz = (center[2] - orig[2])*ics;
+	
+	float maxr = 1.41f*dtMax(extents[0], extents[2]);
+	int minx = (int)floorf(cx - maxr*ics);
+	int maxx = (int)floorf(cx + maxr*ics);
+	int minz = (int)floorf(cz - maxr*ics);
+	int maxz = (int)floorf(cz + maxr*ics);
+	int miny = (int)floorf((center[1]-extents[1]-orig[1])*ich);
+	int maxy = (int)floorf((center[1]+extents[1]-orig[1])*ich);
+
+	if (maxx < 0) return DT_SUCCESS;
+	if (minx >= w) return DT_SUCCESS;
+	if (maxz < 0) return DT_SUCCESS;
+	if (minz >= h) return DT_SUCCESS;
+
+	if (minx < 0) minx = 0;
+	if (maxx >= w) maxx = w-1;
+	if (minz < 0) minz = 0;
+	if (maxz >= h) maxz = h-1;
+	
+	float xhalf = extents[0]*ics + 0.5f;
+	float zhalf = extents[2]*ics + 0.5f;
+
+	for (int z = minz; z <= maxz; ++z)
+	{
+		for (int x = minx; x <= maxx; ++x)
+		{			
+			float x2 = 2.0f*(float(x) - cx);
+			float z2 = 2.0f*(float(z) - cz);
+			float xrot = rotAux[1]*x2 + rotAux[0]*z2;
+			if (xrot > xhalf || xrot < -xhalf)
+				continue;
+			float zrot = rotAux[1]*z2 - rotAux[0]*x2;
+			if (zrot > zhalf || zrot < -zhalf)
+				continue;
+			const int y = layer.heights[x+z*w];
+			if (y < miny || y > maxy)
+				continue;
+			layer.areas[x+z*w] = areaId;
+		}
+	}
+
+	return DT_SUCCESS;
+}
+
 dtStatus dtBuildTileCacheLayer(dtTileCacheCompressor* comp,
 							   dtTileCacheLayerHeader* header,
 							   const unsigned char* heights,