diff --git a/EXeExecutor.h b/EXeExecutor.h
index 7f8305a..268e055 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -541,6 +541,7 @@ EXE_EXPORT bool ExeSurfTmFacetNearestMidPoint( int nId, int nFacet, const Point3
                                                Point3d& ptMid, Vector3d& vtN) ;
 EXE_EXPORT bool ExeSurfTmFacetCenter( int nId, int nFacet, int nRefId, Point3d& ptCen, Vector3d& vtN) ;
 EXE_EXPORT bool ExeSurfTmFacetNormVersor( int nId, int nFacet, int nRefId, Vector3d& vtNorm) ;
+EXE_EXPORT bool ExeSurfTmFacetOppositeSide( int nId, int nFacet, const Vector3d& vtDir, int nRefId, Point3d& ptP1, Point3d& ptP2) ;
 EXE_EXPORT bool ExeSurfTmFacetsContact( int nId, int nF1, int nF2, int nRefId, bool& bAdjac, Point3d& ptP1, Point3d& ptP2, double& dAng) ;
 EXE_EXPORT bool ExeVolZmapVolume( int nId, double& dVol) ;
 EXE_EXPORT int  ExeVolZmapPartCount( int nId) ;