diff --git a/EGkVolZmap.h b/EGkVolZmap.h
index 2c69967..22d7755 100644
--- a/EGkVolZmap.h
+++ b/EGkVolZmap.h
@@ -35,7 +35,7 @@ class __declspec( novtable) IVolZmap : public IGeoObj
       virtual bool GetVolume( double& dVol) const = 0 ;
       virtual int  GetPartCount( void) const = 0 ;
       virtual bool GetPartVolume( int nPart, double& dVol) const = 0 ;
-      virtual bool GetTriangles( bool bAllBlocks, INTVECTOR& nModifiedBlocks, TRIA3DEXLISTVECTOR& vLstTria) const ;
+      virtual bool GetTriangles( bool bAllBlocks, INTVECTOR& nModifiedBlocks, TRIA3DEXLISTVECTOR& vLstTria) const = 0 ;
       virtual bool GetDexelLines( int nDir, int nPos1, int nPos2, POLYLINELIST& lstPL) const = 0 ;
       virtual bool SetTolerances( double dLinTol, double dAngTolDeg = 90) = 0 ;
       virtual bool SetStdTool( const std::string& sToolName, double dH, double dR, double dCornR, int nFlag) = 0 ;
@@ -57,6 +57,8 @@ class __declspec( novtable) IVolZmap : public IGeoObj
       virtual bool AvoidCylinder( const Frame3d& frCyl, double dL, double dR) const = 0 ;
       virtual IVolZmap* ClonePart( int nPart) const = 0 ;
       virtual bool RemovePart( int nPart) = 0 ;
+      virtual bool Cut( const Plane3d& plPlane) = 0 ;
+      virtual bool Compact( void) = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EXeExecutor.h b/EXeExecutor.h
index f85f41f..f28170f 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -501,6 +501,7 @@ EXE_EXPORT bool ExeVolZmapGetDepth( int nId, const Point3d& ptP, const Vector3d&
                                     double& dInLen, double& dOutLen) ;
 EXE_EXPORT bool ExeVolZmapAvoidBox( int nId, const Frame3d& frBox, const Vector3d& vtDiag, int nRefType) ;
 EXE_EXPORT bool ExeVolZmapAvoidSphere( int nId, const Point3d& ptCen, double dRad, int nRefType) ;
+EXE_EXPORT bool ExeCutVolZmapPlane( int nId, const Point3d& ptOn, const Vector3d& vtN, int nRefType) ;
 
 // Geo Snap Vector/Point/Frame
 EXE_EXPORT bool ExeStartPoint( int nId, int nRefId, Point3d& ptP) ;