diff --git a/nel/tools/build_gamedata/processes/rbank/2_build.py b/nel/tools/build_gamedata/processes/rbank/2_build.py
index b38aea94b..b4c0ca674 100755
--- a/nel/tools/build_gamedata/processes/rbank/2_build.py
+++ b/nel/tools/build_gamedata/processes/rbank/2_build.py
@@ -55,6 +55,7 @@ printLog(log, "")
 # Build rbank bbox
 printLog(log, ">>> Build rbank bbox <<<")
 tempBbox = ExportBuildDirectory + "/" + RbankBboxBuildDirectory + "/temp.bbox"
+rebuiltBbox = False
 if BuildIgBoxes == "":
 	toolLogFail(log, BuildIgBoxesTool, ToolSuffix)
 else:
@@ -70,6 +71,7 @@ else:
 	else:
 		printLog(log, "DETECT SKIP Shape->Bbox")
 	if needUpdateIg or needUpdateShape:
+		rebuiltBbox = True
 		printLog(log, "DETECT DECIDE UPDATE")
 		cf = open("build_ig_boxes.cfg", "w")
 		cf.write("\n")
@@ -204,23 +206,35 @@ elif ExecTimeout == "":
 	toolLogFail(log, ExecTimeoutTool, ToolSuffix)
 else:
 	zonefiles = findFiles(log, ExportBuildDirectory + "/" + ZoneWeldBuildDirectory, "", ".zonew")
+	zonesToBuild = []
 	for zonefile in zonefiles:
 		zone = os.path.basename(zonefile)[0:-len(".zonew")]
 		lr1 = ExportBuildDirectory + "/" + RbankSmoothBuildDirectory + "/" + zone + ".lr"
 		nearzones = subprocess.Popen([ GetNeighbors, zone ], stdout = subprocess.PIPE).communicate()[0].strip().split(" ")
 		printLog(log, "ZONE " + zone + ": " + str(nearzones))
-		zone_to_build = 0
+		zoneToBuild = 0
 		for nearzone in nearzones:
 			sourcePath = ExportBuildDirectory + "/" + ZoneWeldBuildDirectory + "/" + nearzone + ".zonew"
 			if (os.path.isfile(sourcePath)):
-				if (needUpdate(log, sourcePath, lr1)):
-					zone_to_build = 1
+				if (rebuiltBbox or needUpdate(log, sourcePath, lr1)):
+					zoneToBuild = 1
+					zonesToBuild.append(os.path.basename(zonefile))
 		sourcePath = ExportBuildDirectory + "/" + ZoneWeldBuildDirectory + "/" + zone + ".zonew"
-		if zone_to_build:
+		if zoneToBuild:
 			printLog(log, sourcePath + " -> " + lr1)
-			subprocess.call([ ExecTimeout, str(RbankBuildTesselTimeout), BuildRbank, "-c", "-P", "-g", os.path.basename(zonefile) ])
+			# subprocess.call([ ExecTimeout, str(RbankBuildTesselTimeout), BuildRbank, "-c", "-P", "-g", os.path.basename(zonefile) ])
 		else:
 			printLog(log, "SKIP " + lr1)
+	while len(zonesToBuild) > 0:
+		processCommand = [ ExecTimeout, str(RbankBuildTesselTimeout), BuildRbank, "-c", "-P", "-g" ]
+		processCommand.extend(zonesToBuild[:min(len(zonesToBuild), 64)])
+		if len(zonesToBuild) > 64:
+			zonesToBuild = zonesToBuild[64:]
+		else:
+			zonesToBuild = []
+		print processCommand
+		print len(processCommand)
+		subprocess.call(processCommand)
 printLog(log, "")
 
 printLog(log, ">>> Detect modifications to rebuild lr <<<")
@@ -245,7 +259,7 @@ if needUpdateBboxRbank:
 else:
 	printLog(log, "DETECT SKIP Lr->Rbank")
 
-if needUpdateCmbLr or needUpdateCmbRbank or needUpdateLrRbank or needUpdateBboxRbank:
+if rebuiltBbox or needUpdateCmbLr or needUpdateCmbRbank or needUpdateLrRbank or needUpdateBboxRbank:
 	printLog(log, "DETECT DECIDE UPDATE")
 	printLog(log, ">>> Build rbank process global <<<") # This generates temp lr files. TODO: Check if the LR changed?
 	if BuildRbank == "":
diff --git a/nel/tools/pacs/build_rbank/prim_checker.cpp b/nel/tools/pacs/build_rbank/prim_checker.cpp
index e4c2b0b91..effd07bd7 100644
--- a/nel/tools/pacs/build_rbank/prim_checker.cpp
+++ b/nel/tools/pacs/build_rbank/prim_checker.cpp
@@ -336,13 +336,19 @@ void	CPrimChecker::render(CPrimZone *zone, uint8 bits)
  */
 void	CPrimChecker::render(const CPolygon &poly, uint16 value)
 {
+	static const sint centerOffset = 20480; // zones are max 40960
+	CPolygon polyOffset = poly;
+	for (ptrdiff_t i = 0; i < (ptrdiff_t)polyOffset.Vertices.size(); ++i)
+		// center to computeBorders range (-32k to 32k)
+		polyOffset.Vertices[i] += CVector(-centerOffset, centerOffset, 0);
+
 	list<CPolygon>		convex;
 
 	// divide poly in convex polys
-	if (!poly.toConvexPolygons(convex, CMatrix::Identity))
+	if (!polyOffset.toConvexPolygons(convex, CMatrix::Identity))
 	{
 		convex.clear();
-		CPolygon	reverse = poly;
+		CPolygon	reverse = polyOffset;
 		std::reverse(reverse.Vertices.begin(), reverse.Vertices.end());
 		if (!reverse.toConvexPolygons(convex, CMatrix::Identity))
 			return;
@@ -357,6 +363,7 @@ void	CPrimChecker::render(const CPolygon &poly, uint16 value)
 		sint						ymin;
 
 		convex2d.computeBorders(rasterized, ymin);
+		ymin -= centerOffset; // uncenter
 
 		sint	dy;
 		for (dy=0; dy<(sint)rasterized.size(); ++dy)
@@ -365,19 +372,19 @@ void	CPrimChecker::render(const CPolygon &poly, uint16 value)
 
 			for (x=rasterized[dy].first; x<=rasterized[dy].second; ++x)
 			{
-				uint8	prevBits = _Grid.get((uint)x, (uint)(ymin+dy));
+				uint8	prevBits = _Grid.get((uint)x + centerOffset, (uint)(ymin + dy));
 
 				// only set if there was not a water shape there or if previous was lower
 				if ((prevBits & Water) != 0)
 				{
-					uint16	prevWS = _Grid.index((uint)x, (uint)(ymin+dy));
+					uint16	prevWS = _Grid.index((uint)x + centerOffset, (uint)(ymin + dy));
 
 					if (_WaterHeight[value] < _WaterHeight[prevWS])
 						continue;
 				}
 
-				_Grid.index((uint)x, (uint)(ymin+dy), value);
-				_Grid.set((uint)x, (uint)(ymin+dy), Water);
+				_Grid.index((uint)x + centerOffset, (uint)(ymin + dy), value);
+				_Grid.set((uint)x + centerOffset, (uint)(ymin + dy), Water);
 			}
 		}
 	}
@@ -389,13 +396,19 @@ void	CPrimChecker::render(const CPolygon &poly, uint16 value)
  */
 void	CPrimChecker::renderBits(const CPolygon &poly, uint8 bits)
 {
+	static const sint centerOffset = 20480; // zones are max 40960
+	CPolygon polyOffset = poly;
+	for (ptrdiff_t i = 0; i < (ptrdiff_t)polyOffset.Vertices.size(); ++i)
+		// center to computeBorders range (-32k to 32k)
+		polyOffset.Vertices[i] += CVector(-centerOffset, centerOffset, 0);
+
 	list<CPolygon>		convex;
 
 	// divide poly in convex polys
-	if (!poly.toConvexPolygons(convex, CMatrix::Identity))
+	if (!polyOffset.toConvexPolygons(convex, CMatrix::Identity))
 	{
 		convex.clear();
-		CPolygon	reverse = poly;
+		CPolygon	reverse = polyOffset;
 		std::reverse(reverse.Vertices.begin(), reverse.Vertices.end());
 		if (!reverse.toConvexPolygons(convex, CMatrix::Identity))
 			return;
@@ -410,6 +423,7 @@ void	CPrimChecker::renderBits(const CPolygon &poly, uint8 bits)
 		sint						ymin;
 
 		convex2d.computeBorders(rasterized, ymin);
+		ymin -= centerOffset; // uncenter
 
 		sint	dy;
 		for (dy=0; dy<(sint)rasterized.size(); ++dy)
@@ -418,7 +432,7 @@ void	CPrimChecker::renderBits(const CPolygon &poly, uint8 bits)
 
 			for (x=rasterized[dy].first; x<=rasterized[dy].second; ++x)
 			{
-				_Grid.set((uint)x, (uint)(ymin+dy), bits);
+				_Grid.set((uint)x + centerOffset, (uint)(ymin + dy), bits);
 			}
 		}
 	}