[Paraview] Re: vtkPolyData

Alessandro Bellina bellina at uiuc.edu
Wed Jan 30 17:53:48 EST 2008

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,


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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