Dear OOF Users --

A new version of OOF2, 2.3.1, is available on the OOF2 website, 
         http://www.ctcms.nist.gov/oof/oof2.
If you happened to download version 2.3.0 during the past week,
there's no need to upgrade.  Version 2.3.1 only changed a few details
of the build process.

The new OOF2 requires a new version of OOFCanvas, 1.1.1, which
is at 
   https://www.ctcms.nist.gov/oof/oofcanvas/
Again, if you already installed 1.1.0, there is no need to upgrade.

The big differences between 2.3.x and previous OOF2 versions are
that 2.3.x uses modern versions of Python (Python 3.8 or later),
and is built with cmake instead of setup.py.   Brief instructions
for building OOF2 are on the main OOF2 website, with more details
in the README file.
   https://www.ctcms.nist.gov/oof/oof2/README.html

Almost all of the prerequisites for building OOF2 are satisfied by
building OOFCanvas.  See the OOFCanvas page and manual
   https://www.ctcms.nist.gov/oof/oofcanvas/manual.html
for all the details. 

OOF2 2.3.1 will soon be available for Mac users via the MacPorts
package management system.

In addition to the changes mentioned above, there are changes to
the Refine and Snap Refine Skeleton modifiers (they've been merged,
and their arguments are slightly different). Part of that is because
the homogeneity of Skeleton edges along diagonal stair-stepped pixel
boundaries is now computed in a much better way.  Snap Nodes has
been rewritten and produces much better results in certain situations.
The full list of changes is at 
   https://www.ctcms.nist.gov/oof/oof2/changes.html

If you need assistance adapting old OOF2 scripts to the new commands,
please don't hesitate to contact us.

Please let us know if you encounter any problems. Report bugs to
oof_bugs@nist.gov and send other comments to oof_manager@nist.gov.  We
especially like to hear about how you're using OOF2 and OOF3D now and
how you'd like to use it in the future.

Sincerely,
  The OOF developers
       Steve Langer
       Andrew Reid
       Gunay Dogan
       Shahriyar Keshavarz