[vtkusers] Streamtube

[Berk Geveci]

First thing I'd do is to switch to vtkStreamTracer. I no longer maintain
vtkStreamer (and it's sub-classes such as vtkStreamLine) and it is known
to have problems. 

On Tue, 2004-03-09 at 06:49, James C. Robinson wrote:
> Dear All,
> 
> I am using VTK for visualisation of an FE mesh and the transient potential
> field (pressure/flow through porous media) occurring in the domain. In
> addition, I have included flow field data (based on the pressure field and
> the permeability) and I read this into a vtkUnstructuredGrid as a vector
> data set.
> 
> I use a vtkStreamLine combined with a vtkPMTubeFilter to produce a
> streamtube from any user nominated point in the domain. However, the utility
> runs into problems sometimes. This manifests itself in that once the point
> from which the streamtube is to be generated is chosen, the PC hangs while
> it is trying to generate the streamtube. I assume it is because the flow at
> the point (and around it) is so low that the integration process (back
> through the flow field) has to take tiny steps. I could play with step
> length, but if this is set very large one gets an inaccurate streamtube
> path. I use a 2nd order runga kutta integrator.
> 
> Are there any procedures/approaches (or basic functionalities) that I could
> employ to avoid this PC hang phenomenon. Is there a value (flow velocity)
> below which I should not allow the stream tube to begin generating?
> 
> Any ideas would be welcome.
> 
> Jim
> 
> 
> ______________________
> 
> James C. Robinson, PhD,
> Chartered Engineer,
> 42 Rivergrove,
> Glanmire, Co. Cork,
> Eire
> 
> Tel:         +353-21-4822028
> Tel:         +353-87-2393010
> Fax:        +353-21-4822721
> E-mail:     jrobinson at eircom.net
> ______________________
> 
> 
> 
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