diff --git a/EXE_GdbGetSurf.cpp b/EXE_GdbGetSurf.cpp
index ea2bb9f..463529d 100644
--- a/EXE_GdbGetSurf.cpp
+++ b/EXE_GdbGetSurf.cpp
@@ -261,6 +261,25 @@ ExeSurfFrChunkSimpleClassify( int nId1, int nChunk1, int nId2, int nChunk2, doub
    return nRes ;
 }
 
+//----------------------------------------------------------------------------
+bool
+ExeSurfFrChunkCenter( int nId, int nChunk, int nRefId, Point3d& ptCen, Vector3d& vtN)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // recupero la superficie FlatRegion
+   ISurfFlatRegion* pSfr = GetSurfFlatRegion( pGeomDB->GetGeoObj( nId)) ;
+   if ( pSfr == nullptr)
+      return false ;
+  // recupero il centro della parte
+   if ( ! pSfr->GetChunkCentroid( nChunk, ptCen))
+      return false ;
+  // recupero la normale della regione
+   vtN = pSfr->GetNormVersor() ;
+  // gestione trasformazioni ( eventuali)
+   return TransformPoint( pGeomDB, nId, nRefId, ptCen) && TransformVector( pGeomDB, nId, nRefId, vtN) ;
+}
+
 //----------------------------------------------------------------------------
 int
 ExeExtractSurfFrChunkLoops( int nId, int nChunk, int nDestGrpId, int* pnCount)
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index d07d2b7..b24ba1d 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ