[vtkusers] Graphs in VTK

[Jeff Baumes]

Scott,

Let me hopefully clarify some of this to you and others on the list. I have
been working on VTK/Titan/Infovis/OverView/OpenView for a while and names
and projects have morphed over time.

As you know, *infovis in VTK* exists in VTK/Infovis, VTK/Views/Infovis, and
scattered other places throughout VTK. It enables things like
graph/tree/table processing, statistics, charts, node-link diagrams, graph
layout, etc.

*Titan* is now a separate repository (see titan.sandia.gov) which focuses
on scalable analysis algorithms like text processing, clustering, etc. It
exposes most of this as components that can be used in a VTK pipeline, but
contains no additional visualization capabilities.

*OverView* was a project a few years back to explore integrating infovis in
VTK into the ParaView framework. It has since been deprecated.

*OpenView* is a new open source project (not-yet-released) that approaches
OverView's goals in a slightly different way. The name changed mostly
because another unrelated OverView infovis toolkit has since been released
by AP. OpenView uses ParaView as a framework, but is not as tied to
ParaView as OverView was. The processing algorithms exposed as plugins in
OpenView are usable in ParaView but the views will need a bit more work to
be usable by both applications.

I hope that helps clarify things. To mix things up even further, there is a
new (as in a few days ago) vtkGraphItem in VTK that is made to be simpler
and more efficient than vtkGraphLayoutView. Feel free to take a look at it
and provide feedback, there will be more features coming there soon.

And yes there is a basic Tulip reader in VTK but no graphviz reader.

Jeff

On Fri, Jul 13, 2012 at 5:14 PM, Scott Kelly <stk at veritegroup.com> wrote:

> Thanks for the information.
>
> I also looked into Titan, from reading it looks like Titan is developed
> within VTK.  So downloading and installing vtk should also include active
> Titan work.  Did I understand this correctly?
>
> Further, it seemed that vtk/Titan is closely integrated with ParaView.
>  Does this mean Titan functionality is integrated into ParaView.  It would
> be great if I could use ParaView to generate and view large graphs.  Are
> there any prebuilt plugins for ParaView that support Tulip or GraphViz
> graphs?
>
> Thanks,
> Scott
>
>
> On Jul 13, 2012, at 7:42 AM, David E DeMarle wrote:
>
> > I don't personally know how the large graphs were rendered so
> > efficiently. Hopefully Jeff Baumes and the Sandia developers will
> > chime in.
> >
> > OverView morphed into what Sandia now calls the Titan project. Again
> > hopefully someone on that team will chime in about it.
> >
> > David E DeMarle
> > Kitware, Inc.
> > R&D Engineer
> > 21 Corporate Drive
> > Clifton Park, NY 12065-8662
> > Phone: 518-881-4909
> >
> >
> > On Mon, Jul 9, 2012 at 1:17 PM, Scott Kelly <stk at veritegroup.com> wrote:
> >> I'm attempting to use VTK to render large graphs and am having issues
> once I get to about 500 edges and 1000 vertices.  The 3D rendering is slow
> to rotate and zoom.  I'm using the built in vtkRandomGraphSource with a
> vtkForceDirectedLayoutStrategy.  I've seen some great graph examples on the
> web and I'm wondering how they were able to render the graphs and rotate
> them efficiently.  Any ideas on how to render large graphs efficiently in
> vtk?
> >>
> >> Also, what ever happened to the development of OverView?  The latest
> ParaView doesn't have the graph layout view and has no way to import Tulip
> or GraphViz graphs.  Is the integration of OverView into ParaView still
> happening or has it been abandoned?
> >>
> >> Thanks in advance,
> >> Scott
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