I found 
<a href="http://www.femcs.com/vtkjk/" target="_top" rel="nofollow" link="external" style="font-size:13px;color:rgb(85,26,139);font-family:Verdana,Geneva,Helvetica,Arial,sans-serif;background-color:rgb(255,255,255)">vtkCellMassProperties filter</a>:<div>
<br></div><div><a href="http://vtk.1045678.n5.nabble.com/Polyhedral-volume-computation-td5713778.html">http://vtk.1045678.n5.nabble.com/Polyhedral-volume-computation-td5713778.html</a>
</div><div><br></div><div><br></div><div>How do I add this to my VTK project?</div><div><br></div><div><br></div>