diff --git a/EGkSurfTriMesh.h b/EGkSurfTriMesh.h
index accb21c..41056b6 100644
--- a/EGkSurfTriMesh.h
+++ b/EGkSurfTriMesh.h
@@ -89,6 +89,7 @@ class __declspec( novtable) ISurfTriMesh : public ISurf
       virtual ISurfTriMesh* CloneTriangle( int nTria) const = 0 ;
       virtual bool GetLoops( POLYLINEVECTOR& vPL) const = 0 ;
       virtual bool GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR& vPL, bool bAllTria = false) const = 0 ;
+      virtual bool GetSilhouette( const Plane3d& plPlane, 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 5a1a2ce..0bd64ba 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -757,6 +757,8 @@ EXE_EXPORT bool ExeSurfTmFacetOppositeSideEx( int nId, int nFacet, const Vector3
 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, bool bAllTria = false) ;
+EXE_EXPORT int  ExeGetSurfTmSilhouetteEx( int nId, const Point3d& ptOn, const Vector3d& vtN, double dToler, int nDestGrpId, int nRefType,
+                                          int* pnCount, bool bAllTria) ;
 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) ;