Hi Dear Luis Thanks a lot for your efforts and previous helps. I wanna test Examples/Filtering/SurfaceExtraction.cxx. but I don't know how to see the resulting 3D mesh? I am familiar with gnuplot is it helpful? Regards, Esteghamat -- soosho esteghamat at fastmail.fm -- http://www.fastmail.fm - Choose from over 50 domains or use your own