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Hi David,<BR><BR><BR>Thanks for the example. It works perfectly for me. Except that I use the GetSphere() method of vtkSphereSource to get the implicit function of the sphere... (If I do that Like u manually it takes looooooooooooonger!)<BR><BR><BR>ps: It didn't work first because I didn't use the VtkIdFilter <BR><BR><BR><BR><BR> <br /><hr />Hotmail : un service de messagerie gratuit, fiable et complet <a href='https://signup.live.com/signup.aspx?id=60969' target='_new'>Profitez-en</a></body>
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