CGM is a powerful CAD abstraction component that incorporates many geometry evaluation and modification utilities

The Common Geometry Module
One of CUBIT's strengths is its ability to import and mesh geometry from a variety of CAD packages. The CGM component currently integrates ACIS and Pro/E geometry kernels directly within its code base, allowing direct manipulation of the native CAD geometry format within CUBIT. This reduces the errors and anomalies so often associated with geometry translation. CGM also boasts a facet-based geometry kernel developed at Sandia that can be used for remeshing or editing old mesh files or models defined by triangle facets. In addition, CUBIT has developed a comprehensive virtual geometry capability that permits local composites and partitions to geometry without modifying the underlying native geometry representation. This permits the user to ignore, clean-up or add features to the model allowing greater flexibility to meshing algorithms to generate better quality elements. Making CGM available as a third party library has allowed several applications at the laboratories access to its extensive suite of geometry operations. Work is ongoing to make CGM more accessible to users through a simplified Application Programmer's Interface (API). 

CGM is now available under LGPL license. Browse the 1400 downloads page and select CGM from the pull-down menu to get access to the source code. If you want to run CGM with ACIS underneath, you also need a license for the ACIS solid modeling engine; see Spatial's web site for details. Contact Tim Tautges (tautges@mcs.anl.gov) if you have any questions.

          CGM Technical Report

CGM Technical Information (offsite)