diff --git a/LuaLibs/BeamExec.lua b/LuaLibs/BeamExec.lua
index da8fe19..6bff6b5 100644
--- a/LuaLibs/BeamExec.lua
+++ b/LuaLibs/BeamExec.lua
@@ -645,6 +645,8 @@ local function CollectFeatures( Part, dRotIndex)
                   Proc.AffectedFaces = BeamLib.GetAffectedFaces( Proc, Part)
                   -- volume feature approssimato
                   Proc.dVolume = FeatureLib.GetFeatureVolume( Proc, Part)
+                  -- se trimesh, numero di parti di cui è composta
+                  Proc.nParts = EgtSurfTmPartCount( Proc.id) or 1
                   -- calcolo topologia solo se necessario, altrimenti si sfruttano le informazioni della feature BTL
                   local bIsFeatureReadyForProcessing = false
                   if FeatureLib.NeedTopologyFeature( Proc, Part) then
diff --git a/LuaLibs/FaceData.lua b/LuaLibs/FaceData.lua
index 18229e3..4bd64d9 100644
--- a/LuaLibs/FaceData.lua
+++ b/LuaLibs/FaceData.lua
@@ -91,7 +91,9 @@ function FaceData.GetFacesByAdjacencyNumber( Proc)
       FacesByAdjacencyNumber[i] = {}
    end
    for i = 1, Proc.nFct do
-      table.insert( FacesByAdjacencyNumber[#Proc.Faces[i].Adjacencies], Proc.Faces[i])
+      if #Proc.Faces[i].Adjacencies > 0 then
+         table.insert( FacesByAdjacencyNumber[#Proc.Faces[i].Adjacencies], Proc.Faces[i])
+      end
    end
 
    return FacesByAdjacencyNumber
@@ -389,7 +391,21 @@ local function GetBottomFaces( Proc)
       BottomFaces = FacesByAdjacencyNumber[ Proc.nFct - 1]
       -- caso speciale DoubleBevel
       if #BottomFaces == 0 then
-         BottomFaces = FacesByAdjacencyNumber[ Proc.nFct / 2]
+         if Proc.nParts == 1 then
+            BottomFaces = FacesByAdjacencyNumber[ Proc.nFct / 2]
+         -- DoubleBevel composto da più parti
+         else
+            for i = #FacesByAdjacencyNumber, 1, -1 do
+               if #FacesByAdjacencyNumber[i] > 0 then
+                  BottomFaces = FacesByAdjacencyNumber[i]
+                  break
+               end
+            end
+            -- se non sono state trovate facce di fondo significa che nessuna faccia ha adiacenze -> DoubleBevel-2
+            if #BottomFaces == 0 then
+               BottomFaces = Proc.Faces
+            end
+         end
       end
       -- si rimuovono le facce non adatte ad essere lavorate
       local nBottomFaces = #BottomFaces
@@ -694,15 +710,21 @@ function FaceData.GetMainFaces( Proc, Part)
       Proc.Topology.sFamily == 'Pocket' or Proc.Topology.sFamily == 'Tunnel' or Proc.Topology.sFamily == 'Bevel' or
       Proc.Topology.sFamily == 'DoubleBevel' or Proc.Topology.sFamily == 'Cut' or Proc.Topology.sFamily == 'HeadCut' or Proc.Topology.sFamily == 'TailCut' then
       
-      if ( Proc.Topology.bIsThrough and Proc.Topology.bAllRightAngles and Proc.nFct < 5)
-         or ( Proc.nFct == 1) or Proc.Topology.sName == 'Bevel-2-Blind' then
+      if Proc.nParts == 1 and ( ( Proc.Topology.bIsThrough and Proc.Topology.bAllRightAngles and Proc.nFct < 5)
+         or ( Proc.nFct == 1) or Proc.Topology.sName == 'Bevel-2-Blind') then
 
          MainFaces.TunnelAddedFaces = GetTunnelFaces( Proc, Part)
       end
 
       MainFaces.BottomFaces = GetBottomFaces( Proc)
-      MainFaces.LongFaces = GetLongFaces( Proc, MainFaces)
-      MainFaces.SideFaces = GetSideFaces( Proc, MainFaces)
+      if Proc.nParts == 1 then
+         MainFaces.LongFaces = GetLongFaces( Proc, MainFaces)
+         MainFaces.SideFaces = GetSideFaces( Proc, MainFaces)
+      -- caso tipo DoubleBevel con facce separate
+      else
+         MainFaces.LongFaces = {}
+         MainFaces.SideFaces = {}
+      end
 
    else
       MainFaces = nil
diff --git a/LuaLibs/FeatureLib.lua b/LuaLibs/FeatureLib.lua
index 2fc439b..d083f81 100644
--- a/LuaLibs/FeatureLib.lua
+++ b/LuaLibs/FeatureLib.lua
@@ -226,13 +226,13 @@ function FeatureLib.ClassifyTopology( Proc, Part)
    elseif Proc.nFct == 2 and bAllAnglesConcave and #vTriangularFaces == 1 then
       sFamily = 'Bevel'
       bIsThrough = false
-   elseif Proc.nFct == 2 and bAllAnglesConcave and ( Proc.AffectedFaces.bLeft or Proc.AffectedFaces.bRight) and ( Proc.AffectedFaces.bFront or Proc.AffectedFaces.bBack) then
+   elseif Proc.nFct == 2 and bAllAnglesConcave and Proc.nParts == 1 and ( Proc.AffectedFaces.bLeft or Proc.AffectedFaces.bRight) and ( Proc.AffectedFaces.bFront or Proc.AffectedFaces.bBack) then
       sFamily = 'Rabbet'
       bIsThrough = true
-   elseif Proc.nFct == 2 and bAllAnglesConcave then
+   elseif Proc.nFct == 2 and bAllAnglesConcave and Proc.nParts == 1 then
       sFamily = 'VGroove'
       bIsThrough = true
-   elseif Proc.nFct == 2 and not bAllAnglesConcave and bIsAnyDimensionLongAsPart then
+   elseif Proc.nFct == 2 and ( not bAllAnglesConcave or Proc.nParts == 2) and bIsAnyDimensionLongAsPart then
       sFamily = 'DoubleBevel'
       bIsThrough = true
    elseif Proc.nFct == 3 and bAllAnglesConcave and #vFacesByAdjNumber[2] == 1 and #vTriangularFaces == 2 then
@@ -244,7 +244,9 @@ function FeatureLib.ClassifyTopology( Proc, Part)
    elseif Proc.nFct == 3 and bAllAnglesConcave and #vFacesByAdjNumber[2] == 3 then
       sFamily = 'Groove'
       bIsThrough = false
-   elseif Proc.nFct == 4 and ( ( #vFacesByAdjNumber[2] == 2 and #vTriangularFaces == 2) or ( #vFacesByAdjNumber[3] == 2)) and not bAllAnglesConcave then
+   elseif Proc.nFct == 4
+          and ( ( not bAllAnglesConcave and ( ( #vFacesByAdjNumber[2] == 2 and #vTriangularFaces == 2) or ( #vFacesByAdjNumber[3] == 2)))
+          or ( #vTriangularFaces == 2 and Proc.nParts == 2))  then
       sFamily = 'DoubleBevel'
       bIsThrough = false
    elseif Proc.nFct == 4 and bAllAnglesConcave and #vFacesByAdjNumber[3] == 2 then
@@ -259,7 +261,9 @@ function FeatureLib.ClassifyTopology( Proc, Part)
    elseif Proc.nFct == 5 and bAllAnglesConcave and #vFacesByAdjNumber[4] == 1 then
       sFamily = 'Pocket'
       bIsThrough = false
-   elseif Proc.nFct == 6 and #vFacesByAdjNumber[1] == 4 and #vFacesByAdjNumber[3] == 2 and #vTriangularFaces == 4 and not bAllAnglesConcave then
+   elseif Proc.nFct == 6
+          and ( ( #vFacesByAdjNumber[1] == 4 and #vFacesByAdjNumber[3] == 2 and #vTriangularFaces == 4 and not bAllAnglesConcave)
+          or ( #vFacesByAdjNumber[1] == 4 and #vTriangularFaces == 4 and Proc.nParts == 2)) then
       sFamily = 'DoubleBevel'
       bIsThrough = false
    end