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Donna, Getting closer to the solution about Xlib: extension "GLX" missing on display ":0.0" John Stokes here set up the X windows system server for our Linux machines. He says when using hardware 3D acceleration - part of the Nvidia card - you need the Nvidia driver to work with OpenGL. To see if you have an Nvidia card in /var/log grep NVIDIA XFree86.0.log I get Device "NVIDIA GeForce 4 (generic) and a lot of other information, ending with Loading extension NV-GLX which may be the driver described next. To get the Nvidia driver, which includes it appears GLX, go to http://www.nvidia.com/content/drivers/drivers.asp and choose Graphics Drivers->GeForce->Linux IA32 (Intel architecture 32 bit)->Go and follow the instructions to install it. That is what was done on our systems. We also have in the file /ext/X11/XF86Config-4 Section "Module" # Load "GLcore" Load "dbe" Load "extmod" Load "fbdevhw" # Load "dri" Load "glx" Load "record" Load "freetype" Load "type1" EndSection note GLcore and dri are commented out. DRI is software 3D graphics acceleration used when you do not have the Nvidia card set up as described. John says we are not using Mesa (or DRI obviously). Stu >From: Donna Tucker <address@hidden> >Subject: Re: 20030724: idv and RedHat 7.3 >Organization: UCAR/Unidata >Keywords: 200310081430.h98EUJOb027744 -- **************************************************************************** Unidata User Support UCAR Unidata Program 303 497 8643 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata WWW Service http://my.unidata.ucar.edu/content/support ****************************************************************************