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The Common Geometry Module (CGM)
Read Me

This is code from merging the cubit14.0 code and Version13.1.1 code.
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The Common Geometry Module (CGM) 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; CGM also includes capabilities not commonly found in
solid modeling engines, like geometry decomposition tools and support
for shared material interfaces.  CGM is built upon the ACIS solid
modeling engine, but also includes geometry capability developed
beside and on top of ACIS.  CGM can be used as-is to provide geometry
functionality for codes needing this capability.  However, CGM 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.  CGM is supported on Sun Solaris, SGI, HP, Linux
and Windows NT platforms.  CGM also includes support for loading ACIS
models on parallel computers, using MPI-based communication.  Future
plans for CGM are to port it to different solid modeling engines,
including Pro/Engineer or SolidWorks.  CGM is being released into the
public domain under an LGPL license; the ACIS-based engine is
available to ACIS licensees on request.  

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Dependencies
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CGM can be built using the CMake utility, which is "an extensible,
open-source system that manages the build process in an operating
system and compiler independent manner", or (on *NIX) using a
configure-make system.  Cmake is available under an open source
license, and can be downloaded in binary or source formats; see
http://www.cmake.org for details.

CGM can be built without using any external solid modeling engines; in
this form, facet-based geometry can be constructed, queried and
modified.  Specific engines relying on third-party, commercial
modelers are also available, to those licensed to use those modelers.
Contact the CUBIT team at cubit-dev_at_sandia.gov for details and to
obtain source code for these engines.

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Compiling
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1. Unpack the source code in some directory CGM_DIR, and change
directory into CGM_DIR.
2a. Run cmake in that directory, using either the non-interactive
("cmake .") or interactive ("ccmake .") version, OR
2b. Run "./configure" in that directory, optionally specifying where
ACIS libraries are located and other options (run "./configure -h" for
a list of options).
3. Make the CGM libraries by typing "make".
4. Test the build using "make test".
5. Install the CGM libraries by typing "make install" (this installs
the libraries to the location specified by the --prefix option to
configure, or to /usr/local by default).
6. Test the installation using "make test".

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Documentation, Testing, Example Applications
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Documentation for CGM is available from the CGM web page,
http://cubit.sandia.gov/CGM.

Example applications are included with the CGM distribution in the
cgm_apps subdirectory.  Examples include importing and querying solid
model-based geometry, and constructing facet-based geometry.  If you
are interested in contributing examples to be included with CGM, we
would welcome submissions; please send them to the email address
below.

The best example for how to build applications is to look in the
cgm_apps/examples/facetdriver (without ACIS) and
cgm_apps/examples/driverc++ (with ACIS) subdirectories.

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Bugs, Correspondence, Contributing
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CGM is LGPL code, and we encourage users to submit bug reports (and,
if desired, fixes) to cubit-dev_at_sandia.gov.  Users are encouraged to check
http://cubit.sandia.gov/CGM often for news and updates.

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Updates
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14.0 (4/05): Initial public CGM release