[vtkusers] vtkPolyLine - Add new points dynamically?

[Darshan Pai]

and your error might be the BuildCells() . you havent created a CellArray
for the PolyData .

On Mon, Jul 26, 2010 at 7:10 AM, Markus Ott <ott-markus at t-online.de> wrote:

> Thanks Eric, this sounds great.
>
> I tried it but think i made a mistake somewhere.
> Does anybody see my error? (Java snippet below)
>
>                points = new vtkPoints();
>
>                double origin[] = {0.0, 0.3, 0.1};
>                double p0[] = {1.0, 0.5, 0.8};
>                double p1[] = {0.3, 0.4, 0.7};
>                double p2[] = {0.4, 0.2, 0.2};
>                double p3[] = {0.4, 0.8, 0.3};
>
>                points.InsertNextPoint(origin);
>                points.InsertNextPoint(p0);
>                points.InsertNextPoint(p1);
>                points.InsertNextPoint(p2);
>                points.InsertNextPoint(p3);
>
>                polyData = new vtkPolyData();
>                polyData.SetPoints(points);
>                polyData.BuildCells();
>
>                path = new vtkTemporalPathLineFilter();
>                path.UsePointIndexForIdsOn();
>                path.SetInput(polyData);
>
>
>                vtkPolyDataMapper mapper = new vtkPolyDataMapper();
>                mapper.SetInputConnection(path.GetOutputPort());
>
>                traceActor = new vtkActor();
>                traceActor.SetMapper(mapper);
>                traceActor.VisibilityOn();
>
>                VisualizationPanel.getInstance().addActor(traceActor);
>
> Eric E. Monson schrieb:
> > Hey Markus,
> >
> > I don't know if this will quite work for your application, but in case
> you didn't know about it, there is the vtkTemporalPathLineFilter:
> >
> > http://www.vtk.org/doc/nightly/html/classvtkTemporalPathLineFilter.html
> >
> > I haven't looked through the code, but it may help with your methods. I
> use it in ParaView all the time to trace out particle paths in
> time-dependent data sets.
> >
> > -Eric
> >
> > ------------------------------------------------------
> > Eric E Monson
> > Duke Visualization Technology Group
> >
> >
> > On Jul 26, 2010, at 10:15 AM, Markus Ott wrote:
> >
> >> Hi vtkusers.
> >>
> >> What i want to do is some kind of real time position tracing. An object
> >> moves through 3d space and I want to trace this movement with a line.
> >>
> >> I read the polyline example
> >> (http://vtk.org/Wiki/VTK/Examples/GeometricObjects/Display/PolyLine)
> >>
> >> I need to dynamically add new points to the line in real time and show
> >> the changes immediately.
> >>
> >> In the example the positions are already known before creating the line.
> >> How can i update this polyline, add new points and show the changes as
> >> the line updates?
> >>
> >> Another thing: If I add more and more points the line will have too much
> >> points eventually. Can i filter out not needed points to keep the
> >> polydata simple?
> >>
> >> Regards,
> >> Markus
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> >
> >
> >
>
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