Differences between QMG 1.1 and QMG 2.0

• The major upgrade in QMG 2.0 is that curved geometries are now supported. See "Geometric Objects" for more information.
• The QMG source code has been rewritten for better performance. For example, the following table summarizes the performance on test case test5 running on a Pentium Pro, Windows NT 4.0 machine under Matlab 5.2.

  Version	Running time	Worst aspect ratio	Number of tets
  QMG 1.1	25 sec	270	11540
  QMG 2.0	9 sec	121	16235

• QMG 2.0 under Tcl/Tk supports an XDR interface for interplatform data exchage at the binary level.
• Geometric object datatypes in both Matlab and Tcl/Tk are now stored in a "native" format instead of chunk format used in QMG 1.1. This means that objects can be directly manipulated using high-level scripting language instructions.

• QMG 2.0 does not generate surface meshes.
• QMG 2.0 has fewer geometric modeling operations available than QMG 1.1. In particular, the set boolean operations are not available.
• Infinite brep faces are not permitted in QMG 2.0.
• The Ascii format in QMG 2.0 is not upward compatible with QMG 1.1. To ease in the transition, the function gmq11read is provided to read QMG 1.1 Ascii-format breps into QMG 2.0.
• Several routines now have new calling sequences.

This documentation is written by Stephen A. Vavasis and is copyright ©1999 by Cornell University. Permission to reproduce this documentation is granted provided this notice remains attached. There is no warranty of any kind on this software or its documentation. See the accompanying file 'copyright' for a full statement of the copyright.