[Paraview] Surface vector - Linear Integral Convolution

[Simone Crippa]

Hello,

On Fri, 2006-03-03 at 13:10 -0500, Berk Geveci wrote:
> LIC has been implemented for VTK (by Jean Favre). I am ashamed to
> admit that  I still have not added it to VTK. However, this algorithm
> works only on flat surfaces. Would this be enough?


I came across Jean's filter last week and already compiled it.
After also recompiling Paraview 2.4.2 (shared libs!), PVLEA works fine
with the sample vf.xx.vti files.

Had to play around a bit with the settings, but now I get it working as
I want it!


As Berk says, the filter can only handle 2d, planar surfaces, but I have
3D RANS, Ensight datasets that I would like to unleash LIC on! Even if I
make a cut plane, the LEA filter is grayed out. I think it should be due
to the unstructured mesh of the cut.

What I'd need is the possibility to visualize surface-bound vectors
(skin friction coefficient in 3 directions) ... obviously on non-planar
surfaces! It seems that it's not possible right now. Does somebody
(Jean?) have thought of generalizing the filter?


Thanks, Simone



> On 3/1/06, Simone Crippa <crippa at kth.se> wrote:
> > Hello list,
> >
> > this topic has appeared before on the mailing list and I was able to
> > help someone who asked how to visualize surface vectors confined on a
> > surface (e.g. skin friction). Back then I suggested to constrain the
> > vector field to be parallel to the surface and then visualize the field
> > using glyphs or streamlines. That's what I've been doing so far (with
> > pretty bad results), but recently I came across:
> >
> > LIC (Line Integral Convolution) is a well-known texture-based method
> > which, presented by Cabral and Leedom of Lawrence Livermore National
> > Laboratory.
> >
> > So I am wondering if anybody on this list (from LLNL?) knows if LIC has
> > been implemented into Paraview or VTK.
> >
> > Is there maybe an other method for visualizing in a smart way surface
> > vectors?
> >
> >
> > Thanks, Simone
> >
> >
> > --
> > Simone Crippa
> > Research assistant, Dipl.-Ing.
> > Royal Institute of Technology (KTH)
> > Aeronautical and Vehicle Engineering
> > Division of Aerodynamics
> > Teknikringen 8
> > SE-10044 Stockholm, Sweden
> > +46 (0)8 790 6465
> >
> > _______________________________________________
> > ParaView mailing list
> > ParaView at paraview.org
> > http://www.paraview.org/mailman/listinfo/paraview
> >
-- 
Simone Crippa
Research assistant, Dipl.-Ing.
Royal Institute of Technology (KTH)
Aeronautical and Vehicle Engineering
Division of Aerodynamics
Teknikringen 8
SE-10044 Stockholm, Sweden
+46 (0)8 790 6465