The Chimera release for Linux was compiled on a Red Hat 7.1 system. It has been tested on the Red Hat Enterprise Linux WS release 4. It should also work on any other reasonably modern Linux distribution such as Debian, etc., although we have not tested this. We had reports that the earlier releases crashed on the Mandrake 8.2 and 9.0 distributions — the solution was to upgrade to Mandrake 9.1.
Help filesChimera uses a web browser to display help files. If chimera is unable to display help files, you can fix it by setting your BROWSER environment variable to "firefox" or "kfm" before running Chimera (i.e. type export BROWSER=firefox at the unix command line).
If Chimera terminates with an error that ends in TclError: Togl: couldn't get visual, this typically means that your graphics card isn't configured to support any TrueColor visuals with stencil buffer support. If you run glxinfo -t at the command line, the tail end of the output lists the currently available visuals. If none of the visuals listed have a "Visual Type" of TrueColor, or if all of the TrueColor visuals have zero in their "stencil" field, then you need to reconfigure your graphics card. Usually that reconfiguration involves increasing the number of colors displayed by the graphics card to 24 or 32 bits. In particular, NVidia cards typically start offering stencil buffer support at visual depths of 24 bits and higher.
If Chimera terminates with the error OpenGL misconfiguration detected, that means that you have two different versions of libGL.so installed — one in /usr/lib (installed by your graphics card driver) and one in /usr/X11R6/lib (the Mesa, OpenGL-compatible, software-only version). Reinstalling your graphics card driver should remove the /usr/X11R6/lib version. This error is usually the result of upgrading your operating system — you can prevent it from reoccurring by uninstalling the libGL package (e.g., xorg-X11-Mesa-libGL package) so it doesn't get updated and reinstalling your graphics card driver (because uninstalling your libGL package probably removed the version installed by your graphics driver). With the NVidia drivers, reinstalling, using the SUSE yast tool or the Red Hat yum tool, is known not to work; instead, use the NVidia driver installer from the NVidia driver download page.
On startup, you may see the warning
Xlib: extension "XFree86-DRI" missing on display "0.0".That means that there was no graphics driver found for your card that uses the DRI, direct rendering interface, technology for fast 3D graphics. The solution is to either ignore the warning or to upgrade your hardware and software (see Mesa/OpenGL issues below).
Graphics (Mesa/OpenGL) issuesHistorically, most versions of Mesa (a software OpenGL implemenation) have had problems. Therefore, in addition to speed advantages, we strongly recommend using hardware graphics acceleration. The NVidia GeForce and Quadro Linux drivers, the ATI FireGL and Catalyst drivers for Linux, and the 3Dlabs Wildcat Linux drivers are known to work. We also expect that the Xi Graphics drivers would work well.
There are two main X servers with OpenGL support using Mesa for Linux, the XFree86 distributions, and the X.Org distributions. In both X servers, the software OpenGL portion can be replaced with a hardware graphics driver for much greater performance. All XFree86 versions up to version 4.6.0 (which uses Mesa 6.2.1), are known to have problems with chimera. Recent X.Org versions, 6.9.0 and later, which use newer versions of Mesa (6.4.1 and later), appear to work.
Choosing a graphics card is difficult, it depends on the size of the structures you wish to visualize as well any other features you need (e.g., low cost, large display support, hardware stereo in a window). To help you choose a graphics card, look at the chimera benchmarks. Also look at our information on hardware stereo.
DownloadingHere's what you need to do to get chimera working on your Linux system:
- (1) Download Chimera release.
- We recommend that you use the latest production release. However, you may wish to try out snapshot releases (listed lower down on the download page), which have the newest features but are less well tested than production releases.
Some browsers may download the file as
chimera-get.py. If yours does, rename the file to
If you experience difficulty downloading the distribution, try this link as a simple test to see if the size of the Chimera distribution is causing problems. The link should download a small Python program to your computer. The only difference between this and the Chimera distribution download is the size of the file, so if the link works then something in your environment is blocking the downloading of very large files.
If this test download does not work, then something in your environment is blocking the download of any binary file (the download is sent using the http content type of "application/octet-stream").
You can try downloading the Chimera distribution to a different computer or from a different network that you are sure does not make use of a proxy web server.
- (2) Run the downloaded executable file from a terminal window.
This will install Chimera. Some browsers do not make the downloaded file executable. If necessary, use the Linux command
chmod +x filenameto make it executable. You might want to read the release notes.
- (3) Update your runtime environment.
If CHIMERA is the top-level directory of the chimera installation, then you should add CHIMERA/bin to your command path. See your shell's documentation to figure out set the path or ask your system administrator.
Chimera does not provide a deinstallation program. Instead, follow these deinstallation instructions.
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