diff --git a/Controller.vb b/Controller.vb
index 0321127..8f7a16e 100644
--- a/Controller.vb
+++ b/Controller.vb
@@ -167,6 +167,7 @@ Public Class Controller
       GRID_INVERT
       BIARC
       CURVEBEZIER
+      TRIMSURFTMWITHCURVE
    End Enum
    Public Enum GRID_TYPE As Integer
       NONE = 0
@@ -1228,8 +1229,13 @@ Public Class Controller
    End Sub
 
    Public Sub SetLastBoolean(bVal As Boolean)
+      If m_nLastCmd = CMD.TRIMSURFTMWITHCURVE And m_bLast <> bVal Then
+         DragInvertCurve()
+      End If
+
       m_bLast = bVal
-      If m_nLastCmd = CMD.TEXTPLUS Or m_nLastCmd = CMD.POLYGON Or m_nLastCmd = CMD.EXTRUDE Or m_nLastCmd = CMD.REVOLVE Or m_nLastCmd = CMD.SETCURVETHICKNESS Then
+      If m_nLastCmd = CMD.TEXTPLUS Or m_nLastCmd = CMD.POLYGON Or m_nLastCmd = CMD.EXTRUDE Or m_nLastCmd = CMD.REVOLVE _
+         Or m_nLastCmd = CMD.SETCURVETHICKNESS Or m_nLastCmd = CMD.TRIMSURFTMWITHCURVE Then
          ' aggiorno drag al cambio di italic
          ExecuteDrag()
       End If
@@ -1522,6 +1528,9 @@ Public Class Controller
       ' Cut Surface with Another one
          Case CMD.CUTSURFSURF
             bOk = ProcessCutSurfSurf()
+      ' Cut Surface with (Extrusion of a closed) Curve
+         Case CMD.TRIMSURFTMWITHCURVE
+            bOk = ProcessCutSurfTmWithCurve()
       ' Inverse Cut Surface with Another one
          Case CMD.INVCUTSURFSURF
             bOk = ProcessInvCutSurfSurf()
@@ -1767,6 +1776,8 @@ Public Class Controller
             DragSolidSubtractSurf()
          Case CMD.INTERSECTSURFSURF
             DragIntersectSurfSurf()
+         Case CMD.TRIMSURFTMWITHCURVE
+            DragTrimSurfTmWithCurve()
          Case CMD.CUTSURFSURF
             DragCutSurfSurf()
          Case CMD.INVCUTSURFSURF
@@ -6092,6 +6103,81 @@ Public Class Controller
       End If
    End Sub
 
+   Private Function ProcessCutSurfTmWithCurve() As Boolean
+      Select Case m_nStep
+         Case 0
+            ' deve esistere un gruppo corrente e devo poter creare il gruppo di drag
+            If GetCurrLayer() = GDB_ID.NULL Or Not m_Scene.CreateDragGroup() Then Return False
+            ' imposto nuovo stato
+            m_nStep = 1
+            ' abilito dialogo
+            RaiseEvent PrepareInputBox("TRIM SURF WITH CURVE", "", "Invert Curve", True, True)
+            RaiseEvent SetInputBoxCheck(m_bLastBooleanCheck)
+            RaiseEvent AddInputBoxCombo("Delete trim curve", True)
+            RaiseEvent AddInputBoxCombo("Keep trim curve", False)
+            ' anteprima
+            EgtDisableModified()
+            DragTrimSurfTmWithCurve()
+            EgtEnableModified()
+         Case 1
+            ' eseguo il taglio della superficie
+            EnableCommandLog()
+            Dim nLastId As Integer = EgtGetLastSelectedObj()
+            Dim nPrevId As Integer = EgtGetPrevSelectedObj()
+            If EgtGetType(nPrevId) = GDB_TY.SRF_MESH And EgtGetType(nLastId) = GDB_TY.CRV_COMPO Then
+               EgtCutSurfTmClosedCurve(nPrevId, nLastId, False)
+               If m_nLast = 0 Then
+                  EgtErase(nLastId)
+               End If
+            ElseIf EgtGetType(nPrevId) = GDB_TY.CRV_COMPO And EgtGetType(nLastId) = GDB_TY.SRF_MESH Then
+               EgtCutSurfTmClosedCurve(nLastId, nPrevId, False)
+               If m_nLast = 0 Then
+                  EgtErase(nPrevId)
+               End If
+            End If
+            DisableCommandLog()
+            ' salvo stato
+            m_bLastBooleanCheck = m_bLast
+            ' reset stato scena
+            m_Scene.ResetStatus()
+            ' reset stato
+            m_nStep = 0
+            RaiseEvent UpdateUI(Me, True)
+         Case Else
+            m_nStep = 0
+            Return False
+      End Select
+      Return True
+   End Function
+
+   Private Sub DragTrimSurfTmWithCurve()
+      If m_nStep = 1 Then
+         ' cancello eventuale vecchia superficie taglio
+         EgtEmptyGroup(m_Scene.GetDragGroup())
+         ' eseguo il taglio della prima superficie con la seconda
+         Dim nLastId As Integer = EgtGetLastSelectedObj()
+         Dim nPrevId As Integer = EgtGetPrevSelectedObj()
+         If EgtGetType(nPrevId) = GDB_TY.SRF_MESH And EgtGetType(nLastId) = GDB_TY.CRV_COMPO Then
+            Dim nDragId As Integer = EgtCopyGlob(nPrevId, m_Scene.GetDragGroup())
+            EgtCutSurfTmClosedCurve(nDragId, nLastId, False)
+         ElseIf EgtGetType(nPrevId) = GDB_TY.CRV_COMPO And EgtGetType(nLastId) = GDB_TY.SRF_MESH Then
+            Dim nDragId As Integer = EgtCopyGlob(nLastId, m_Scene.GetDragGroup())
+            EgtCutSurfTmClosedCurve(nDragId, nPrevId, False)
+         End If
+         EgtDraw()
+      End If
+   End Sub
+
+   Private Sub DragInvertCurve()
+      Dim nLastId As Integer = EgtGetLastSelectedObj()
+      Dim nPrevId As Integer = EgtGetPrevSelectedObj()
+      If EgtGetType(nPrevId) = GDB_TY.SRF_MESH And EgtGetType(nLastId) = GDB_TY.CRV_COMPO Then
+         EgtInvertCurve(nLastId)
+      ElseIf EgtGetType(nPrevId) = GDB_TY.CRV_COMPO And EgtGetType(nLastId) = GDB_TY.SRF_MESH Then
+         EgtInvertCurve(nPrevId)
+      End If
+   End Sub
+
    Private Function ProcessInvCutSurfSurf() As Boolean
       Select Case m_nStep
          Case 0