diff --git a/LuaLibs/ProcessRidgeLap.lua b/LuaLibs/ProcessRidgeLap.lua
index df34b2b..dbfc145 100644
--- a/LuaLibs/ProcessRidgeLap.lua
+++ b/LuaLibs/ProcessRidgeLap.lua
@@ -173,7 +173,7 @@ function ProcessRidgeLap.Make( Proc, nPhase, nRawId, nPartId, dOvmHead)
       end
       -- calcolo riferimenti per facce inclinate
       local vtRef = Vector3d( vtN[vFaceOrd[3]])
-      local vtRef2 = EgtIf( bHead, X_AX(), -X_AX())
+      local vtRef2 = Vector3d( vtN[vFaceOrd[2]])
       -- eseguo
       for i = 1, #vCuts do
          local nOrthoOpposite