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The Common Geometry Module, Argonne (CGMA)
The Common Geometry Module, Argonne (CGMA) is a code library which provides geometry functionality used for mesh generation and other applications. This functionality includes that commonly found in solid modeling engines, like geometry creation, query and modification; CGMA also includes capabilities not commonly found in solid modeling engines, like geometry decomposition tools and support for shared material interfaces. CGMA is built upon the ACIS solid modeling engine, but also includes geometry capability developed beside and on top of ACIS. CGMA can be used as-is to provide geometry functionality for codes needing this capability. However, CGMA can also be extended using derived classes in C++, allowing the geometric model to serve as the basis for other applications, for example mesh generation. CGMA is supported on various computing platforms, including parallel computers.
CGMA is derived from the Common Geometry Module (CGM) developed at Sandia National Laboratories. CGMA was forked from CGM shortly after the release of CGM 10.2. Depending on whether Sandia continues to release CGM along with new releases of CUBIT, CGMA may or may not stay current with CGM. Features will be added to CGMA which likely won't make their way back into CGM, again depending on what Sandia decides to do. CGM serves as a basis for the CUBIT code, and can be obtained in source code form here.
CGMA should be able to read and restore geometry created in CGM and CUBIT. CGMA is maintained in a world-readable svn repository, at https://svn.mcs.anl.gov/repos/ITAPS/cgm/trunk. If you would like to participate in the development of CGMA, contact Tim Tautges to get write access to this repository.
CGMA and ACIS
CGMA can be compiled with or without the ACIS modeling engine. In addition, the decision about whether to enable ACIS in CGMA can be made by the application at compile time, or even at run time if the appropriate share library magic happens. In its most widely used configuration, though, CGMA usually incorporates ACIS. To build CGMA, therefore, one usually needs the ACIS libraries and the CGMA code which calls ACIS.
Because of license restrictions on code calling ACIS functions, we are not allowed to release the CGMA-ACIS code under an open source license. If you would like this code, you must contact the CUBIT project at Sandia National Laboratories (cubit-dev@sandia.gov) and request the code, and be prepared to prove you have an ACIS license.
Alternatively, CGMA can be linked to the ACIS libraries through the CUBIT code. To accomplish this, pass the --with-CUBIT= option to the CGMA configure script, pointing it to the directory containing the CUBIT bin/ and lib/ subdirectories. To obtain a license for the CUBIT code, see the CUBIT licensing web page.
Other Modeling Engines
Work is underway to port CGM to the Open.Cascade open-source modeling engine. Anticipated arrival date is sometime late calendar year 2007, but as usual, that's only an estimate. Check back here often for details if you're interested.
Mailing lists
There are two mailing lists for CGMA:
* CGMA-announce: For general announcements, e.g. releases
* CGMA-dev: The nitty gritty details, including svn checkin messages
To send a message, send it to CGMA-announce _at_ mcs.anl.gov or CGMA-dev _at_ mcs.anl.gov.
To subscribe, send email to majordomo _at_ mcs.anl.gov, with 'subscribe <listname>' in the message body.
Archives are located at dev and announce. NOTE: for the time being, these are ANL-only; I'll try to get that changed as soon as possible.
Downloads
If you use CGMA, please be kind enough to send us a note about how you're using it, to cgma-dev _at_ mcs.anl.gov. Feel free to send any bug reports and suggested improvements there too!
Recent CGMA releases:
CGMA 10.2.2 (pre-release)
