diff --git a/EGkSubtractProjectedFacesOnStmFace.h b/EGkSubtractProjectedFacesOnStmFace.h
new file mode 100644
index 0000000..80e3fe2
--- /dev/null
+++ b/EGkSubtractProjectedFacesOnStmFace.h
@@ -0,0 +1,30 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2023-2023
+//----------------------------------------------------------------------------
+// File : EGkSubtractProjectedFacesOnStmFace.h      Data : 26.09.23       Versione : 2.5j1
+// Contenuto : Dichiarazione della funzione per proiettare facce di TriMesh su una superficie di TriMesh.
+//
+//
+//
+// Modifiche : 26.09.23 RE Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkSurfTriMesh.h"
+
+//----------------------- Macro per import/export ----------------------------
+#undef EGK_EXPORT
+#if defined( I_AM_EGK)            // da definirsi solo nella DLL
+   #define EGK_EXPORT __declspec( dllexport)
+#else
+   #define EGK_EXPORT __declspec( dllimport)
+#endif
+
+//-----------------------------------------------------------------------------
+EGK_EXPORT bool SubtractProjectedFacesOnStmFace( const ISurfTriMesh& Stm, int nFaceInd,
+                                                 ISURFTMPOVECTOR& vStmOthers, INTVECTOR& vFIndOthers,
+                                                 bool bOCFlag, bool& bExistProjection, ISurfTriMesh*& pStmRes,
+                                                 int& nNewFaceNbr) ;
diff --git a/EGkSurfTriMesh.h b/EGkSurfTriMesh.h
index e37521a..422b767 100644
--- a/EGkSurfTriMesh.h
+++ b/EGkSurfTriMesh.h
@@ -85,7 +85,7 @@ class __declspec( novtable) ISurfTriMesh : public ISurf
       virtual bool GetTriangleSmoothNormals( int nId, TriNormals3d& TNrms) const = 0 ;
       virtual ISurfTriMesh* CloneTriangle( int nTria) const = 0 ;
       virtual bool GetLoops( POLYLINEVECTOR& vPL) const = 0 ;
-      virtual bool GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR& vPL) const = 0 ;
+      virtual bool GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR& vPL, bool bAllTria = false) const = 0 ;
       virtual int  GetFacetCount( void) const = 0 ;
       virtual int  GetFacetSize( void) const = 0 ;
       virtual int  GetFacetFromTria( int nT) const = 0 ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index e05e505..7973916 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -608,6 +608,9 @@ EXE_EXPORT bool ExeSurfTmIntersect( int nId1, int nId2, bool bTwoColors = false)
 EXE_EXPORT bool ExeSurfTmResetTwoColors( int nId) ;
 EXE_EXPORT int  ExeSurfTmSplit( int nId, int nSplitterId, int* pnCount) ;
 EXE_EXPORT bool ExeSurfTmCut( int nId, int nCutterId, bool bInVsOut, bool bSaveOnEq) ;
+EXE_EXPORT bool ExeSubtractProjectedFacesOnStmFace( int nSurfId, int nFaceInd, int nDestGrpId,
+                                                    INTVECTOR vSurfsId, INTVECTOR vSurfFacesInd, bool bOCFlag,
+                                                    int& nNewId, bool& bExistProjection, int& nNewFaceNbr) ;
 
 // GeomDb Volume Modify
 EXE_EXPORT int  ExeExplodeVolume( int nId, int* pnCount) ;
@@ -701,7 +704,7 @@ EXE_EXPORT bool ExeSurfTmFacetOppositeSideEx( int nId, int nFacet, const Vector3
                                               Point3d& ptP1, Point3d& ptPm, Point3d& ptP2, Vector3d& vtIn1, Vector3d& vtOut2, double& dLen, double& dWidth) ;
 EXE_EXPORT bool ExeSurfTmFacetsContact( int nId, int nF1, int nF2, int nRefId, bool& bAdjac, Point3d& ptP1, Point3d& ptP2, double& dAng) ;
 EXE_EXPORT int  ExeExtractSurfTmLoops( int nId, int nDestGrpId, int* pnCount) ;
-EXE_EXPORT int  ExeGetSurfTmSilhouette( int nId, const Vector3d& vtDir, double dToler, int nDestGrpId, int nRefType, int* pnCount) ;
+EXE_EXPORT int  ExeGetSurfTmSilhouette( int nId, const Vector3d& vtDir, double dToler, int nDestGrpId, int nRefType, int* pnCount, bool bAllTria = false) ;
 EXE_EXPORT int  ExeExtractSurfTmFacetLoops( int nId, int nFacet, int nDestGrpId, int* pnCount) ;
 EXE_EXPORT int  ExeCopySurfTmFacet( int nId, int nFacet, int nDestGrpId) ;
 EXE_EXPORT bool ExeSurfTmGetAllVertInFacet( int nId, int nFacet, INTVECTOR& vVert) ;