📄 upgrade.html
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<title>Differences between QMG 1.1 and QMG 2.0</title>
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<a href="qmg2_0_home.html"><img src=logo1.jpg alt="QMG logo"></a></td>
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<h1>
Differences between QMG 1.1 and QMG 2.0
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<ul>
<li>
The major upgrade in QMG 2.0 is that curved geometries are now
supported. See <a href="geom.html">"Geometric Objects"</a> for more
information.
<li>
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.
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<tr> <th>Version </th> <th> Running time </th><th> Worst aspect ratio </th>
<th> Number of tets</th></tr>
<tr> <td>QMG 1.1 </td> <td> 25 sec</td> <td>270</td><td>11540</td>
</tr>
<tr> <td>QMG 2.0</td> <td>9 sec</td> <td> 121 </td><td> 16235</td>
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<li>
QMG 2.0 under Tcl/Tk supports an XDR interface for interplatform data exchage
at the binary level.
<li>
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.
</ul>
Because of the added complexity of curved boundaries, some capabilities
of QMG 1.1 have been removed from QMG 2.0, including:
<ul>
<li>
QMG 2.0 does not generate surface meshes.
<li>
QMG 2.0 has fewer geometric modeling operations available than QMG 1.1.
In particular,
the set boolean operations are not available.
<li>
Infinite brep faces are not permitted in QMG 2.0.
<li>
The Ascii format in
QMG 2.0 is not upward compatible with QMG 1.1. To ease in the
transition, the function <a href="ref.html#gmq11read"><code>gmq11read</code></a>
is provided to read QMG 1.1 Ascii-format breps into QMG 2.0.
<li>
Several routines now have new calling sequences.
</ul>
<hr>
<p>
This documentation is written by
<a href="http://www.cs.cornell.edu/home/vavasis/vavasis.html">Stephen A.
Vavasis</a> and is
copyright ©1999 by <a href="http://www.info.cornell.edu/CUHomePage.html">Cornell
University</a>.
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
<a href="copyright.html">'copyright'</a>
for a full statement of the copyright.
<p>
<address>
Stephen A. Vavasis, Computer Science Department, Cornell University,
Ithaca, NY 14853, vavasis@cs.cornell.edu
</address>
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