diff --git a/EXE_GdbModifySurf.cpp b/EXE_GdbModifySurf.cpp
index 715142b..85a5a05 100644
--- a/EXE_GdbModifySurf.cpp
+++ b/EXE_GdbModifySurf.cpp
@@ -367,6 +367,74 @@ ExeSurfFrRotateSimpleNoCollision( int nId1, int nId2, const Point3d& ptCen, doub
    return ( bOk && CAvSimpleSurfFrMove( *pSfr1, *pSfr2L).Rotate(ptCenL, dAngDeg)) ;
 }
 
+//-------------------------------------------------------------------------------
+static int
+MySurfTmToTriangles( int nId, int& nCount)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
+  // recupero la superficie TriMesh
+   const ISurfTriMesh* pStm = GetSurfTriMesh( pGeomDB->GetGeoObj( nId)) ;
+   if ( pStm == nullptr)
+      return GDB_ID_NULL ;
+  // recupero il numero di triangoli
+   int nTria = pStm->GetTriangleCount() ;
+  // se ci sono più triangoli, li separo
+   if ( nTria > 1) {
+     // copio tutti triangoli
+      int nFirstId = GDB_ID_NULL ;
+      nCount = 0 ;
+      for ( int i = 0 ; i < pStm->GetTriangleSize() ; ++ i) {
+         ISurfTriMesh* pFac = pStm->CloneTriangle( i) ;
+         if ( pFac == nullptr)
+            continue ;
+        // inserisco la superficie nello stesso gruppo e nello stesso posto del GeomDB
+         int nNewId = pGeomDB->InsertGeoObj( GDB_ID_NULL, nId, GDB_BEFORE, pFac) ;
+         if ( nNewId == GDB_ID_NULL)
+            return GDB_ID_NULL ;
+        // copio gli attributi
+        if ( ! pGeomDB->CopyAttributes( nId, nNewId))
+            return GDB_ID_NULL ;
+        // aggiorno contatori
+         if ( nFirstId == GDB_ID_NULL)
+            nFirstId = nNewId ;
+         ++ nCount ;
+      }
+     // elimino la superficie originale
+      pGeomDB->Erase( nId) ;
+     // restituisco risultati
+      return nFirstId ;
+   }
+  // non devo fare alcunché
+   nCount = 1 ;
+   return nId ;
+}
+
+//-------------------------------------------------------------------------------
+int
+ExeSurfTmToTriangles( int nId, int* pnCount)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
+  // verifico sia una superficie trimesh
+   int nFirstId = GDB_ID_NULL ;
+   int nCount = 0 ;
+   if ( pGeomDB->GetGeoType( nId) == SRF_TRIMESH) {
+      nFirstId = MySurfTmToTriangles( nId, nCount) ;
+   }
+   ExeSetModified() ;
+  // se richiesto, salvo il comando Lua equivalente
+   if ( IsCmdLog()) {
+      string sLua = "EgtSurfTmToTriangles(" + ToString( nId) + ")" +
+                    " -- Id1=" + ToString( nFirstId) + ",Nbr=" + ToString( nCount) ;
+      LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
+   }
+  // restituisco risultati
+   if ( pnCount != nullptr)
+      *pnCount = nCount ;
+   return nFirstId ;
+}
+
 //-------------------------------------------------------------------------------
 bool
 ExeSurfTmRemoveFacet( int nId, int nFacet)
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index e6409ab..4ed6e2b 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbModifySurf.cpp b/LUA_GdbModifySurf.cpp
index 5f1732f..7c31fe9 100644
--- a/LUA_GdbModifySurf.cpp
+++ b/LUA_GdbModifySurf.cpp
@@ -123,6 +123,25 @@ LuaSurfFrOffset( lua_State* L)
    return 1 ;
 }
 
+//----------------------------------------------------------------------------
+static int
+LuaSurfTmToTriangles( lua_State* L)
+{
+  // 1 parametro : nId
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   LuaClearStack( L) ;
+  // esplosione della trimesh in triangoli
+   int nCount ;
+   int nFirstId = ExeSurfTmToTriangles( nId, &nCount) ;
+   if ( nFirstId != GDB_ID_NULL)
+      LuaSetParam( L, nFirstId) ;
+   else
+      LuaSetParam( L) ;
+   LuaSetParam( L, nCount) ;
+   return 2 ;
+}
+
 //----------------------------------------------------------------------------
 static int
 LuaSurfTmRemoveFacet( lua_State* L)
@@ -338,6 +357,7 @@ LuaInstallGdbModifySurf( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfFrSubtract", LuaSurfFrSubtract) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfFrIntersect", LuaSurfFrIntersect) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfFrOffset", LuaSurfFrOffset) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmToTriangles", LuaSurfTmToTriangles) ;  
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmRemoveFacet", LuaSurfTmRemoveFacet) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmSwapFacets", LuaSurfTmSwapFacets) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmRemovePart", LuaSurfTmRemovePart) ;