[vtkusers] HELP Wanted: Visualizing data from an OpenFOAM simulation

[Bill Lorensen]

You need to set the active scalar for the point data and specify the
range of the scalars for the mapper.

See:
#!
import vtk
file_name = "U_nearWalls.vtk"

reader = vtk.vtkPolyDataReader()
reader.SetFileName(file_name)
reader.ReadAllScalarsOn()
reader.ReadAllVectorsOn()
reader.Update()
reader.GetOutput().GetPointData().SetActiveScalars("U")
mapper=vtk.vtkPolyDataMapper()
mapper.SetInputConnection(reader.GetOutputPort())
mapper.SetScalarRange(reader.GetOutput().GetPointData().GetScalars().GetRange())
actor=vtk.vtkActor()
actor.SetMapper(mapper)

renderer = vtk.vtkRenderer()
renderer.AddActor(actor)
renderer.SetBackground(0.1, 0.2, 0.4)
render_window = vtk.vtkRenderWindow()
render_window.AddRenderer(renderer)
render_window.SetSize(300, 300)
interactor = vtk.vtkRenderWindowInteractor()
interactor.SetRenderWindow(render_window)

interactor.Initialize()
render_window.Render()
interactor.Start()

On Tue, Nov 8, 2016 at 1:08 PM, Andre Zimmer
<andre.zimmer at rwth-aachen.de> wrote:
> Hi,
> by now I have spend days trying to visualize data from the OpenFOAM sample
> function object.
> Here is a small test case:
> https://www.dropbox.com/s/5bhic1ms0anzrno/U_nearWalls.vtk?dl=0
>
> No matter what I do I always get a gray car. I have tried specifically
> setting the scalar, vector, array, transforming and all kinds of stuff
> without success.
> In the simplest form I think the Python code should look like this:
>
> import vtk
>  file_name = "U_nearWalls.vtk"
>
> reader = vtk.vtkPolyDataReader()
> reader.SetFileName(file_name)
> reader.ReadAllScalarsOn()
> reader.ReadAllVectorsOn()
> reader.Update()
>
> mapper=vtk.vtkPolyDataMapper()
> mapper.SetInputConnection(reader.GetOutputPort())
>
> actor=vtk.vtkActor()
> actor.SetMapper(mapper)
>
> renderer = vtk.vtkRenderer()
> renderer.AddActor(actor)
> renderer.SetBackground(0.1, 0.2, 0.4)
>  render_window = vtk.vtkRenderWindow()
> render_window.AddRenderer(renderer)
> render_window.SetSize(300, 300)
>  interactor = vtk.vtkRenderWindowInteractor()
> interactor.SetRenderWindow(render_window)
>
> interactor.Initialize()
> render_window.Render()
> interactor.Start()
>
>
> I am using Fedora 24, Python 2.7, VTK 6.3.
> I assume it is only a small mistake I am making so hopefully someone can
> help.
>
> Thank you in advance,
> André
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