[vtkusers] FW: Rectilinear grid & StreamTube

[João Cunha]

Have you tried to probe (vtkProbeFilter) the temperature data using the
tube as probe ?

JDC

"ivo.leitao" wrote:

> Hi !
>
> I have a rectilinear grid with wind speed at certain
> latitudes/longitudes/days and that grid contains only vector data.
>
> I was able to build a stream tube to represent the data without
> problems, but now I need to use another file with the temperature data
> (also on a rectilinear grid) at those same latitude/longitude/days to
> colorize the stream tube. Since I do not have any scalar data on the
> initial file I’ve tried to use the Merge Filter to do it but I was
> unable to colorize de data tube.
>
> I have tried to do something like this:
>
> # Streamline
>
> vtkRungeKutta4 integ
>
> vtkStreamLine streamLine
>
>             streamLine SetInput [windSpeedRectilinearGridReader
> GetOutput]
>
>   streamLine SetStartPosition 0 30 61
>
>   streamLine SetMaximumPropagationTime 44
>
>   streamLine SetStepLength 0.01
>
>   streamLine SetIntegrationStepLength 0.01
>
>   streamLine SetIntegrationDirectionToForward
>
>   streamLine OrientationScalarsOff
>
>   streamLine SpeedScalarsOff
>
>   streamLine SetIntegrator integ
>
> # Streamtube
>
> vtkTubeFilter streamTube
>
>             streamTube SetInput [streamLine GetOutput]
>
>   streamTube SetRadius 1
>
>   streamTube SetNumberOfSides 12
>
>   streamTube SetVaryRadiusToVaryRadiusByVector
>
> vtkMergeFilter mergeFilter
>
>   mergeFilter SetGeometry [streamTube GetOutput]
>
>   mergeFilter SetScalars  [temperatureRectilinearGridReader GetOutput]
>
> vtkPolyDataMapper polyDataMapper
>
>   polyDataMapper SetInput [mergeFilter GetOutput]
>
>   polyDataMapper ScalarVisibilityOn
>
>   eval polyDataMapper SetScalarRange
> [[[[temperatureRectilinearGridReader GetOutput] GetPointData]
> GetScalars] GetRange]
>
> vtkActor actor
>
>             actor SetMapper polyDataMapper
>
> It didn’t work, so can anynone help me with this ? How do I colorize
> the stream tube with external scalar data ?
>
> Tnks for any answer concerning this subject
>
> Best Regars, Ivo Leitão
>
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--
João Duarte Cunha
Investigador-Coordenador
Director do Centro da Qualidade na Construção
jdc at lnec.pt

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