Hi, I submitted some new samples to the bug list. But it is not in the CVS. http://www.vtk.org/Bug/bug.php?op=show&bugid=649&pos=0 greets Ingo --- Dr.-Ing. Ingo H. de Boer Polytec GmbH Polytec-Platz 1-7, 76337 Waldbronn, Germany phone: ++49 7243 604 106 fax : ++49 7243 604 255