[Paraview] Re: vtkPolyData

[Alessandro Bellina]

Berk,
No, my current version of ParaView doesn't support Delaunay3D filter
(3.2.1). If you could enable it that would be great. I am not sure why
it needs that filter... it seems pretty obvious that a stream from
vectors should be doable.

Thanks for your help,

Alessandro

On Feb 3, 2008 2:41 PM, Berk Geveci <berk.geveci at kitware.com> wrote:
> I did not carefully follow this thread but it sounds like you are
> trying to create streamlines from a set of vertices. VTK/ParaView do
> not support this. You have to create a solid mesh from your set of
> points. One good way of doing this is to use the Delaunay3D filter. I
> can't remember if this is already available in ParaView. If not let me
> know and I can enable it.
>
> -berk
>
>
> On 1/30/08, Alessandro Bellina <bellina at uiuc.edu> wrote:
> > Kent,
> > Thank you very much for your suggestion. I hadn't thought of that.
> >
> > I tried it with VTK_VERTEX and I am able to see the data. I am also able to
> > use the Glypth module to add arrows.
> >
> > Now the StreamTracer filter just doesn't makes everything disappear. I am
> > not sure if it works for this datatype. I am not sure if anybody has dealt
> > with the filter. I add it after Glyph, or even before I add Glyph, and
> > everything disappears.
> >
> > Thank you,
> >
> > Alessandro
> >
> >
> > On Jan 30, 2008 10:39 AM, Kent Eschenberg <eschenbe at psc.edu> wrote:
> > > It seems you want your data to be stored as an unstructured grid with
> > cells of
> > > type 1 (VTK_VERTEX). At each cell you will have one attribute which is a
> > vector
> > > with 3 components.
> > >
> > > Such a grid can be run through the Glyph module to put a line or arrow at
> > each
> > > cell. Let Glyph do that - don't store the data as lines.
> > >
> > > I haven't tried it but vtkStreamTracer should be able to generate
> > streamlines
> > > from such a grid.
> > >
> > > To obtain such a grid you will need to store your data in one of the file
> > > formats that can represent that type of grid. For example, both the VTK
> > legacy
> > > and the VTK XML file formats can do this. Their ASCII versions are easy to
> > > generate.
> > >
> > > Kent
> > > Pittsburgh Supercomputing Center
> > >
> > >
> > >
> > >
> > > Alessandro Bellina wrote:
> > >  > Robert,
> > >  > Since last time I posted this I was able to display something close to
> > what
> > >  > I want to do, but not quite exactly.
> > >  >
> > >  > I have a 2-D vector field that changes in time. In each time step the
> > vector
> > >  > has six coordinates V = {(x1,y1,z1), (x2,y2,z2)}. What I was ble to do
> > >  > yesterday was plot them as <Lines>. So I did 2 points per line and that
> > >  > worked OK. What I am interested in doing with this field is to plot a
> > stream
> > >  > (stream tracer.) So at some timestep in the future I want to be able to
> > see
> > >  > some of the old features of the previous timeteps. I think the stream
> > tracer
> > >  > filter does this but I can't use it with lines. Any other filters that
> > do
> > >  > this?
> > >  >
> > >  > The file then has <Points> <Lines>. And <Lines> have a connectivity and
> > >  > offset table.
> > >  >
> > >  > I've seen some great renderings of stream-like behavior in ParaView.
> > >  >
> > >  > Ultimately I'd like to be able to color the stream to imply angle of
> > >  > inclination  of the vectors with respect to a normal, I think this is
> > >  > secondary.
> > >  >
> > >  > Thanks for your help,
> > >  >
> > >  > Alessandro
> > >
> >
> >
>
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>