diff --git a/EgtInterface.vb b/EgtInterface.vb
index 8031a85..d4a8b83 100644
--- a/EgtInterface.vb
+++ b/EgtInterface.vb
@@ -2456,6 +2456,15 @@ Public Function EgtCreateSurfFlatRegion(nParentId As Integer, nCrvId() As Intege
       Return EgtCreateSurfFlatRegion_64(nParentId, nCrvId.Length(), nCrvId)
    End If
 End Function
+Public Function EgtCreateSurfFlatRegion(nParentId As Integer, nCrvId As Integer) As Integer
+   Dim nCrvIds(0) As Integer
+   nCrvIds(0) = nCrvId
+   If IntPtr.Size = 4 Then
+      Return EgtCreateSurfFlatRegion_32(nParentId, 1, nCrvIds)
+   Else
+      Return EgtCreateSurfFlatRegion_64(nParentId, 1, nCrvIds)
+   End If
+End Function
 
 <DllImport(EgtIntDll32, CharSet:=CharSet.Unicode, EntryPoint:="EgtCreateSurfTmBBox")>
 Private Function EgtCreateSurfTmBBox_32(nParentId As Integer, ByRef ptMin As Point3d, ByRef ptMax As Point3d,
@@ -5319,6 +5328,34 @@ Public Function EgtSurfFrNormVersor(nId As Integer, ByRef VtNorm As Vector3d) As
    Return EgtSurfFrNormVersor(nId, nId, VtNorm)
 End Function
 
+<DllImport(EgtIntDll32, CharSet:=CharSet.Unicode, EntryPoint:="EgtSurfFrChunkCount")>
+Private Function EgtSurfFrChunkCount_32(nId As Integer) As Integer
+End Function
+<DllImport(EgtIntDll64, CharSet:=CharSet.Unicode, EntryPoint:="EgtSurfFrChunkCount")>
+Private Function EgtSurfFrChunkCount_64(nId As Integer) As Integer
+End Function
+Public Function EgtSurfFrChunkCount(nId As Integer) As Integer
+   If IntPtr.Size = 4 Then
+      Return EgtSurfFrChunkCount_32(nId)
+   Else
+      Return EgtSurfFrChunkCount_64(nId)
+   End If
+End Function
+
+<DllImport(EgtIntDll32, CharSet:=CharSet.Unicode, EntryPoint:="EgtSurfFrChunkSimpleClassify")>
+Private Function EgtSurfFrChunkSimpleClassify_32(nId1 As Integer, nChunk1 As Integer, nId2 As Integer, nChunk2 As Integer) As Integer
+End Function
+<DllImport(EgtIntDll64, CharSet:=CharSet.Unicode, EntryPoint:="EgtSurfFrChunkSimpleClassify")>
+Private Function EgtSurfFrChunkSimpleClassify_64(nId1 As Integer, nChunk1 As Integer, nId2 As Integer, nChunk2 As Integer) As Integer
+End Function
+Public Function EgtSurfFrChunkSimpleClassify(nId1 As Integer, nChunk1 As Integer, nId2 As Integer, nChunk2 As Integer) As Integer
+   If IntPtr.Size = 4 Then
+      Return EgtSurfFrChunkSimpleClassify_32(nId1, nChunk1, nId2, nChunk2)
+   Else
+      Return EgtSurfFrChunkSimpleClassify_64(nId1, nChunk1, nId2, nChunk2)
+   End If
+End Function
+
 <DllImport(EgtIntDll32, CharSet:=CharSet.Unicode, EntryPoint:="EgtSurfTmFacetFromTria")>
 Private Function EgtSurfTmFacetFromTria_32(nId As Integer, nT As Integer) As Integer
 End Function
@@ -9633,6 +9670,15 @@ Public Enum INS_POS As Integer
    BC = 8
    BR = 9
 End Enum
+'Costanti : semplice classificazione dei chunk di due regioni
+Public Enum REGC As Integer
+   NULL = 0
+   IN1 = 1
+   IN2 = 2
+   SAME = 3
+   OUT = 4
+   INTERS = 5
+End Enum
 'Costanti : interruzione di riga
 Public Const LINE_BREAK As String = "<br/>"
 'Costanti : tipo creazione pezzo piatto
diff --git a/My Project/AssemblyInfo.vb b/My Project/AssemblyInfo.vb
index 08cf545..163c1dd 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("1.6.16.4")> 
-<Assembly: AssemblyFileVersion("1.6.16.4")> 
+<Assembly: AssemblyVersion("1.6.18.1")> 
+<Assembly: AssemblyFileVersion("1.6.18.1")>