I've been using the "brick of bytes" format for my FDTD outputs, but unfortunately I can' find any type of 3d viewer for Windows. I am now using the X11/OpenGL based Animabob, which creates a movie of the series of dumped files. I am thinking of trying some other type of file format and viewer. I am wondering what others use to view 3d fields or data? Of course if it used Numpy and Python all the better. Thanks, Rob. -- The Numeric Python EM Project www.members.home.net/europax