diff --git a/Engine/source/navigation/navMesh.cpp b/Engine/source/navigation/navMesh.cpp
index 02de1b071..f029c5deb 100644
--- a/Engine/source/navigation/navMesh.cpp
+++ b/Engine/source/navigation/navMesh.cpp
@@ -112,13 +112,39 @@ DefineConsoleFunction(NavMeshUpdateAll, void, (S32 objid, bool remove), (0, fals
    SimSet *set = NavMesh::getServerSet();
    for(U32 i = 0; i < set->size(); i++)
    {
-      NavMesh *m = static_cast<NavMesh*>(set->at(i));
-      m->buildTiles(obj->getWorldBox());
+      NavMesh *m = dynamic_cast<NavMesh*>(set->at(i));
+      if (m)
+      {
+         m->cancelBuild();
+         m->buildTiles(obj->getWorldBox());
+      }
    }
    if(remove)
       obj->enableCollision();
 }
 
+DefineConsoleFunction(NavMeshUpdateAroundObject, void, (S32 objid, bool remove), (0, false),
+   "@brief Update all NavMesh tiles that intersect the given object's world box.")
+{
+   SceneObject *obj;
+   if (!Sim::findObject(objid, obj))
+      return;
+   if (remove)
+      obj->disableCollision();
+   SimSet *set = NavMesh::getServerSet();
+   for (U32 i = 0; i < set->size(); i++)
+   {
+      NavMesh *m = dynamic_cast<NavMesh*>(set->at(i));
+      if (m)
+      {
+         m->cancelBuild();
+         m->buildTiles(obj->getWorldBox());
+      }
+   }
+   if (remove)
+      obj->enableCollision();
+}
+
 DefineConsoleFunction(NavMeshUpdateOne, void, (S32 meshid, S32 objid, bool remove), (0, 0, false),
    "@brief Update all tiles in a given NavMesh that intersect the given object's world box.")
 {
@@ -147,7 +173,7 @@ NavMesh::NavMesh()
    mFileName = StringTable->insert("");
    mNetFlags.clear(Ghostable);
 
-   mSaveIntermediates = true;
+   mSaveIntermediates = false;
    nm = NULL;
    ctx = NULL;
 
@@ -765,13 +791,15 @@ void NavMesh::buildNextTile()
       // Intermediate data for tile build.
       TileData tempdata;
       TileData &tdata = mSaveIntermediates ? mTileData[i] : tempdata;
+      
+      // Remove any previous data.
+      nm->removeTile(nm->getTileRefAt(tile.x, tile.y, 0), 0, 0);
+
       // Generate navmesh for this tile.
       U32 dataSize = 0;
       unsigned char* data = buildTileData(tile, tdata, dataSize);
       if(data)
       {
-         // Remove any previous data.
-         nm->removeTile(nm->getTileRefAt(tile.x, tile.y, 0), 0, 0);
          // Add new data (navmesh owns and deletes the data).
          dtStatus status = nm->addTile(data, dataSize, DT_TILE_FREE_DATA, 0, 0);
          int success = 1;
@@ -830,6 +858,7 @@ unsigned char *NavMesh::buildTileData(const Tile &tile, TileData &data, U32 &dat
    SceneContainer::CallbackInfo info;
    info.context = PLC_Navigation;
    info.boundingBox = box;
+   data.geom.clear();
    info.polyList = &data.geom;
    info.key = this;
    getContainer()->findObjects(box, StaticShapeObjectType | TerrainObjectType, buildCallback, &info);
@@ -843,8 +872,11 @@ unsigned char *NavMesh::buildTileData(const Tile &tile, TileData &data, U32 &dat
    }
 
    // Check for no geometry.
-   if(!data.geom.getVertCount())
+   if (!data.geom.getVertCount())
+   {
+      data.geom.clear();
       return NULL;
+   }
 
    // Figure out voxel dimensions of this tile.
    U32 width = 0, height = 0;