Hi, you need the VTK data file. Get it from http://www.vtk.org/get-software.php and set an environment variable to where it is, like set VTK_DATA_ROOT=E:/VTKData 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