diff --git a/EgtInterface.vb b/EgtInterface.vb
index 6cc79fd..f154be0 100644
--- a/EgtInterface.vb
+++ b/EgtInterface.vb
@@ -1875,11 +1875,8 @@ Public Function EgtSelect(ByVal Curr As Point, ByVal nSelW As Integer, ByVal nSe
 End Function
 
 <DllImport(EgtIntDll, CharSet:=CharSet.Unicode)>
-Public Function EgtGetFirstObjInSelWin() As Integer
-End Function
-
-<DllImport(EgtIntDll, CharSet:=CharSet.Unicode)>
-Public Function EgtGetNextObjInSelWin() As Integer
+Public Function EgtSetObjFilterForSelect(ByVal bZeroDim As Boolean, ByVal bCurve As Boolean,
+                                         ByVal bSurf As Boolean, ByVal bVolume As Boolean, ByVal bExtra As Boolean) As Boolean
 End Function
 
 <DllImport(EgtIntDll, CharSet:=CharSet.Unicode)>
@@ -1894,6 +1891,14 @@ End Function
 Public Function EgtUnselectableClearAll() As Boolean
 End Function
 
+<DllImport(EgtIntDll, CharSet:=CharSet.Unicode)>
+Public Function EgtGetFirstObjInSelWin() As Integer
+End Function
+
+<DllImport(EgtIntDll, CharSet:=CharSet.Unicode)>
+Public Function EgtGetNextObjInSelWin() As Integer
+End Function
+
 <DllImport(EgtIntDll, CharSet:=CharSet.Unicode)>
 Private Function EgtGetPointFromSelect(ByVal nSelId As Integer, ByVal nWinX As Integer, ByVal nWinY As Integer,
                                        ByRef ptP As Point3d, ByRef nAux As Integer) As Boolean
@@ -1932,11 +1937,6 @@ End Function
 Public Function EgtGetLastSnapDir(ByRef VtDir As Vector3d) As Boolean
 End Function
 
-<DllImport(EgtIntDll, CharSet:=CharSet.Unicode)>
-Public Function EgtSetObjFilterForSnap(ByVal bZeroDim As Boolean, ByVal bCurve As Boolean,
-                                       ByVal bSurf As Boolean, ByVal bVolume As Boolean, ByVal bExtra As Boolean) As Boolean
-End Function
-
 <DllImport(EgtIntDll, CharSet:=CharSet.Unicode)>
 Public Function EgtSetShowMode(ByVal nShowMode As SM, Optional ByVal bRedraw As Boolean = True) As Boolean
 End Function
diff --git a/My Project/AssemblyInfo.vb b/My Project/AssemblyInfo.vb
index e00da79..33275bf 100644
--- a/My Project/AssemblyInfo.vb	
+++ b/My Project/AssemblyInfo.vb	
@@ -46,5 +46,5 @@ Imports System.Runtime.InteropServices
 ' utilizzando l'asterisco (*) come descritto di seguito:
 ' <Assembly: AssemblyVersion("1.0.*")> 
 
-<Assembly: AssemblyVersion("1.6.3.3")> 
-<Assembly: AssemblyFileVersion("1.6.3.3")> 
+<Assembly: AssemblyVersion("1.6.3.4")> 
+<Assembly: AssemblyFileVersion("1.6.3.4")> 
diff --git a/Scene.vb b/Scene.vb
index 7f32915..7d8eb8f 100644
--- a/Scene.vb
+++ b/Scene.vb
@@ -228,6 +228,12 @@ Public Class Scene
             Else
                Cursor = New Cursor(Me.GetType(), "Analyze.cur")
             End If
+            ' per selezione percorso abilito solo le curve
+            If m_nStatus = ST.SELPATH Or m_nStatus = ST.SELPATHAUTO Then
+               EgtSetObjFilterForSelect(False, True, False, False, False)
+            Else
+               EgtSetObjFilterForSelect(True, True, True, True, True)
+            End If
             Dim nId As Integer = GDB_ID.NULL
             Dim nSel As Integer
             EgtSelect(e.Location, DIM_SEL, DIM_SEL, nSel)
@@ -272,6 +278,9 @@ Public Class Scene
             End If
          ' se stato misura di distanza (primo punto)
          ElseIf m_nStatus = ST.GETDIST Then
+            If m_bExcludeSurfForSnap Then
+               EgtSetObjFilterForSelect(True, True, False, True, True)
+            End If
             If EgtGetGraphicSnapPoint(m_nSnapType, e.Location, DIM_SEL, DIM_SEL, m_ptPrev) Then
                ' salvo il punto di riferimento
                Dim ptWin As Point3d
@@ -281,6 +290,9 @@ Public Class Scene
             End If
          ' se stato misura di distanza (secondo punto)
          ElseIf m_nStatus = ST.GETDIST2 Then
+            If m_bExcludeSurfForSnap Then
+               EgtSetObjFilterForSelect(True, True, False, True, True)
+            End If
             Dim ptSel As Point3d
             If EgtGetGraphicSnapPoint(m_nSnapType, e.Location, DIM_SEL, DIM_SEL, ptSel) Then
                ' disegno la linea (coordinate geo globali)
@@ -306,6 +318,9 @@ Public Class Scene
             End If
          ' se stato selezione punto
          ElseIf m_nStatus = ST.SELPOINT Then
+            If m_bExcludeSurfForSnap Then
+               EgtSetObjFilterForSelect(True, True, False, True, True)
+            End If
             If Not m_bDragOn Then
                ' rendo selezionabile gruppo di drag
                If Not m_bDragSelectable Then
@@ -874,7 +889,6 @@ Public Class Scene
       ' esclusione superfici da punto snap 
       ElseIf e.ClickedItem.Name = "cmdExcludeSurfForSnap" Then
          m_bExcludeSurfForSnap = Not m_bExcludeSurfForSnap
-         EgtSetObjFilterForSnap(True, True, Not m_bExcludeSurfForSnap, True, True)
       ' Sospensione drag
       ElseIf e.ClickedItem.Name = "cmdStopDrag" Then
          m_bDragOn = False
@@ -1007,6 +1021,7 @@ Public Class Scene
       EgtResetGeoTria(False)
       EgtResetWinRect(False)
       ' reset entità non selezionabili
+      EgtSetObjFilterForSelect(True, True, True, True, True)
       EgtUnselectableClearAll()
       ' imposto lo stato
       m_nStatus = ST.SEL