diff --git a/LuaLibs/CalcPaths.lua b/LuaLibs/CalcPaths.lua
index 3dd6dcf..6082aca 100644
--- a/LuaLibs/CalcPaths.lua
+++ b/LuaLibs/CalcPaths.lua
@@ -14,7 +14,7 @@ local AMD = require( 'AddManData')
 
 ---------------------------------------------------------------------
 local s_nPartId
-local s_dOffsCorr = 50 * GEO.EPS_SMALL
+local s_dOffsCorr = 10 * GEO.EPS_SMALL
 
 ---------------------------------------------------------------------
 local function GetLayerParamsForPathCalc()   
@@ -859,9 +859,11 @@ local function CalcRibsPaths( nSliceGrp, nRibsGrp, LayerParams, nIdx, nMaxStrand
                   else
                      table.insert( tOldNewIds[ vOrderedRibs[i]], nCrv + nInd)
                      
-                     -- controllo la direzione
-                     local vtDir = EgtMV( nCrv + nInd) 
-                     local dVal = EgtIf( abs( vtDir:getX()) > abs( vtDir:getY()) - GEO.EPS_SMALL, vtDir:getX(), vtDir:getY())
+                     -- controllo la direzione (consideriamo inclinazione solo lungo X)
+                     local vtDir = EgtMV( nCrv + nInd)
+                     local dXl = sqrt( sqr( vtDir:getX()) + sqr( vtDir:getZ()))
+                     local dYl = abs( vtDir:getY())
+                     local dVal = EgtIf( dXl > dYl - GEO.EPS_SMALL, vtDir:getX(), vtDir:getY())
                      if dVal < - GEO.EPS_SMALL then
                         EgtInvertCurve( nCrv + nInd)
                         EgtSetInfo( nCrv + nInd, KEY_INVERTED_CRV, 1)
@@ -978,39 +980,6 @@ end
 
 --------------------------------------------------------------------
 local function UpdateTotalShellSurf( nSrf, nCrv, dStrand, nGrpId)
-   
-   --[[local nCopyCrv = EgtCopyGlob( nCrv, nGrpId)
-   -- creo percorso chiuso corrispondente
-   if not EgtCurveIsClosed( nCrv) then
-      local nCopy2 = EgtCopyGlob( nCrv, nGrpId)
-      EgtInvertCurve( nCopy2)
-      EgtAddCurveCompoCurve( nCopyCrv, nCopy2)
-   end      
-      
-   local nOffsP = EgtOffsetCurveAdv( nCopyCrv, dStrand - s_dOffsCorr,  GDB_OT.EXTEND)
-   local vSrfIds = { nOffsP}
-   if EgtCurveIsClosed( nCrv) then
-      -- se curva è chiusa bisogna tenere conto dell'interno
-      local nOffsM, nCnt = EgtOffsetCurveAdv( nCopyCrv, - dStrand + s_dOffsCorr)
-      if nOffsM and nOffsM ~= GDB_ID.NULL then
-         for nId = nOffsM, nOffsM + nCnt - 1 do
-            table.insert( vSrfIds, nId)
-         end
-      end
-   end
-   
-   local nSrfExtraShell = EgtSurfFlatRegion( nGrpId, vSrfIds)
-   
-   if not EgtSurfFrSubtract( nSrf, nSrfExtraShell) then
-      EgtInvertSurf( nSrfExtraShell)
-      EgtSurfFrSubtract( nSrf, nSrfExtraShell)
-   end
-   --EgtErase( nCopyCrv)
-   --for i = 1, #vSrfIds do
-   --   EgtErase( vSrfIds[i])
-   --end
-   --EgtErase( nSrfExtraShell)
-   ]]--
 
    local nSrfExtraShell = EgtSurfFrFatCurve( nGrpId, nCrv, dStrand + s_dOffsCorr, false)
    if nSrfExtraShell then