VACET Software Engineering Group's Progrees Report: February 2007 Page: 4 of 6
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LBL update: Gunther participated in conversations with Phil Colella and
John Bell regarding meeting their needs (along with Wes Bethel and Hank
Childs). Gunther is still learning VisIt, both as a user and as a developer.
Gunther explored issues with making "plugins" work on Macs and shared
his findings with the VisIt team. Gunther has continued to pursue line
integral convulution (LIC) work with Louis Feng. Gunther has uncovered a
problem with the interpolation scheme Louis was using where two polylines
directed at the same face can get stuck going back and forth in a loop.
Gunther has ideas for how to fix this, but is still waiting a further meeting
with Louis.
LLNL update: Brad Whitlock implemented one variant of visual
spreadsheets in VisIt. The variant is the one used by "ChomboVis". (The
other variant of interest is the one used by AMRVis.) More information
about that variant can be found in the document (written by Brad) on visual
spreadsheets located on the VACET wiki. Wes Bethel passed along a
screenshot to Phil Colella, who responded that it appears that VACET is
making good progress. In addition to the actual plot, Brad added key
infrastructure to VisIt to support the plot. The biggest infrastructure changes
were: (1) allowing a plot to modify its attributes from the viewer (which
meant that plots must be able to access the "ViewerProxy" interface), (2)
allowing a plot to access the full meta-data information about the data it was
plotting, and (3) allowing a plot to instantiate and manage its own window,
even one that is not Qt-based.
Hank Childs traded his VACET account number to Brad, so Hank did less
VACET work over the past month. However, the time he did charge was
spent in planning the migration from ClearCase to Subversion for the VisIt
project. VisIt is currently not a project that can be distributed by many
organizations, which is a key limitation, especially in the context of VACET
where many organizations are participating. Using Subversion (coupled
with the support offered by the SciDAC Outreach Center) will allow for this
multi-organization development to take place. In terms of actual work,
Hank developed a script that will transfer the VisIt code base from VisIt's
ClearCase repository to a Subversion repository and maintain versioning
history. Hank also produced a document describing the steps of the
transition process and vetted that document with the group. Hank will put
that document on the VACET wiki in the upcoming month.
ORNL update: Jeremy Meredith explored enhancing parallel coordinates
plots with histogram-based rendering, which will allow the technique to be
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Childs, H. VACET Software Engineering Group's Progrees Report: February 2007, report, March 5, 2007; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc880132/m1/4/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.