Regtri has been renamed Delcx (DELaunay simplicial CompleX).  It is
available as part of the Alpha Shapes 3.0 release.  Although it is
part of that package, it is a stand-alone program that will compute
the (weighted) Delaunay Simplicial Complex (or regular triangulation).
This is a triangulation of a weighted point set, in which a radius is
assigned to each point.  This can be thought of as growing a ball
around the point with that radius.  This affects the computation of
the triangulation, but gives properties similar to the Delaunay
triangulation.  Please see the program documentation for more detailed
information.

Release 3.0 of the Alpha shapes software contains only the executable
version of Delcx.  This can be used with other software in the
following way.  The first time Delcx is run on a data set, it will
generate a binary file.  The ABC mode of Delcx can then be used to
pull ASCII information from this binary file, which can then be fed
into other programs.  In a future release, we will release the source
code for Delcx, and then more interactive work with the Delaunay
triangulation data structure can be performed.

This software can be obtained through anonymous ftp to
ftp.ncsa.uiuc.edu in the directory

	/Visualization/Alpha-shape/alpha-3.0

Currently, the executable is only available for the SGI.  If you
desire to use it on a different system, please send mail to Michael
Facello (facello@cs.uiuc.edu).

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