[vtkusers] increase the number of points on a streamline

[Yifei Li]

Hi all,

I use vtkStreamTracer to trace streamlines as follows:

        integ = vtk.vtkRungeKutta45()
        self.streamer = vtk.vtkStreamTracer()
        self.streamer.SetComputeVorticity(True)
        self.streamer.SetIntegrator(integ)
        self.streamer.SetIntegrationDirectionToBoth()
        self.streamer.SetMaximumPropagation(2000)

However, when I tried to increase the number of points on a streamline by
calling
        self.streamer.SetMaximumIntegrationStep(0.01)

The generated streamlines are much shorter than previous ones.

So what is the correct way to make vtkStreamTracer to generate more points
along a streamline?

Thanks

Yifei
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