diff --git a/LuaLibs/AddManData.lua b/LuaLibs/AddManData.lua
index e2872c8..cc1f2b2 100644
--- a/LuaLibs/AddManData.lua
+++ b/LuaLibs/AddManData.lua
@@ -86,6 +86,8 @@ KEY_WIPE_LEN = 'WipeLen'
 KEY_WIPE_DIR = 'WipeDir'
 KEY_WIPE_FEEDPU = 'WipeFeedPu'
 KEY_TOOL_DIAM = 'ToolDiam'
+KEY_MAX_H = 'SlicingHeight'
+KEY_MAX_SLICES_NBR = 'MaxSlicesNumber'
 KEY_MAX_STRANDH_FACTOR = 'MaxStrandHFactor'
 KEY_MIN_STRANDH_FACTOR = 'MinStrandHFactor'
 KEY_JOIN_SHELLS = 'JoinShells'
@@ -150,6 +152,7 @@ KEY_RIBS_MERGE_WITH_SHELLS = 'RibsMergeWithShell'
 KEY_INVERT_RIBS_MERGED_SHELL_LINK = 'InvertRibsMergedShellMainLink'
 KEY_RIBS_LEAD_FILLET = 'RibsLeadFillet'
 KEY_RIBS_LINK_FILLET = 'RibsLinkFillet'
+KEY_RIBS_MAX_SLICES_NBR = 'RibsMaxSlicesNumber'
 
 -- Regioni con diverso numero di passate
 KEY_SHELL_NBR_DIFF = 'ShellNbrDifference'
@@ -193,8 +196,6 @@ KEY_LINEAR_APPROX = 'LinearApprox'
 KEY_LINEAR_TOL = 'LinearTol'
 
 -- Altre chiavi
-KEY_MAX_H = 'SlicingHeight'
-KEY_MAX_SLICES_NBR = 'MaxSlicesNumber'
 KEY_SLICE_NBR = 'SliceNbr'
 KEY_SLICE_DIR = 'SliceDir'
 KEY_SLICE_POS = 'SlicePos'
diff --git a/LuaLibs/CalcSlices.lua b/LuaLibs/CalcSlices.lua
index 8d6b95f..f7e9154 100644
--- a/LuaLibs/CalcSlices.lua
+++ b/LuaLibs/CalcSlices.lua
@@ -315,6 +315,7 @@ local function GetRibParams( nId)
    ReadParam( nId, KEY_RIBS_MERGE_WITH_SHELLS, 'b', false, RibParam)
    ReadParam( nId, KEY_RIBS_LEAD_FILLET, 'd', 0, RibParam)
    ReadParam( nId, KEY_RIBS_LINK_FILLET, 'd', 0, RibParam)
+   ReadParam( nId, KEY_RIBS_MAX_SLICES_NBR, 'i', 0, RibParam)
    
    return RibParam
 end
@@ -419,14 +420,29 @@ local function SlicingExtraObjects( nLay, vSlicingDir, vSlicingVal, nSlicingType
    local vLayIds = EgtGetNameInGroup( s_nPartId, SLICE_LAYER .. '*')
 
    for i = 1, #vSliceIds do
+      -- ricavo i parametri per lo slicing
+      local vCurrSlicingDir = {}
+      local vCurrSlicingVal = {}
+      if nType == TYPE.RIB and tabParams[i][KEY_RIBS_MAX_SLICES_NBR] > 0 and tabParams[i][KEY_RIBS_MAX_SLICES_NBR] < #vSlicingVal then
+         for j = 1, min( tabParams[i][KEY_RIBS_MAX_SLICES_NBR], #vSlicingDir) do
+            vCurrSlicingDir[j] = vSlicingDir[j]
+         end
+         for j = 1, tabParams[i][KEY_RIBS_MAX_SLICES_NBR] do
+            vCurrSlicingVal[j] = vSlicingVal[j]
+         end
+      else
+         vCurrSlicingDir = vSlicingDir
+         vCurrSlicingVal = vSlicingVal
+      end
+
       -- effettuo lo slicing in layer separati ( analogamente a quanto avviene con il solido)
       local nResId
       if nSlicingType ~= SLICING_TYPE.MULTIPLANAR and nSlicingType ~= SLICING_TYPE.MULTIPLANAR_DEG45 and nSlicingType ~= SLICING_TYPE.MULTIPLANAR_HOR then
-         nResId = EgtParPlanesSurfTmInters( ORIG(), vSlicingDir[1], vSlicingVal, vSliceIds[i], s_nPartId, GDB_RT.GLOB, TOLER)
+         nResId = EgtParPlanesSurfTmInters( ORIG(), vCurrSlicingDir[1], vCurrSlicingVal, vSliceIds[i], s_nPartId, GDB_RT.GLOB, TOLER)
       else
-         for j = 1, #vSlicingVal do
-            local vtN = vSlicingDir[j]
-            local ptOn = vSlicingVal[j]
+         for j = 1, #vCurrSlicingVal do
+            local vtN = vCurrSlicingDir[j]
+            local ptOn = vCurrSlicingVal[j]
             if j == 1 then
                ptOn = ptOn + DELTAZ * vtN
             end
@@ -442,7 +458,7 @@ local function SlicingExtraObjects( nLay, vSlicingDir, vSlicingVal, nSlicingType
       -- recupero i risultati e li sposto nei layers opportuni
       local j = 1
       while nResId do
-         local vtSlicing = vSlicingDir[j] or vSlicingDir[1]
+         local vtSlicing = vCurrSlicingDir[j] or vCurrSlicingDir[1]
          
          -- recupero il gruppo nel layer dove salvare lo slicing degli oggetti o lo creo se non esiste
          local nGrp = EgtGetFirstNameInGroup( vLayIds[j], sNameGrp)