[Paraview] Python Scripting

[Shawn Waldon]

Hi Richard,

Since you didn't specify the version you are using I'm using 5.4-RC3 for
this answer.  I loaded a dataset and ran the Python Trace (Tools -> Start
Trace) to find out what it is doing.  Here is the python script that was
generated from changing what the dataset was colored by.


# get active source.

canex2 = GetActiveSource()


# get active view

renderView1 = GetActiveViewOrCreate('RenderView')

# uncomment following to set a specific view size

# renderView1.ViewSize = [1330, 670]


# get display properties

canex2Display = GetDisplayProperties(canex2, view=renderView1)


# set scalar coloring

ColorBy(canex2Display, ('POINTS', 'VEL', 'Magnitude'))


# get color transfer function/color map for 'vtkBlockColors'

vtkBlockColorsLUT = GetColorTransferFunction('vtkBlockColors')


# Hide the scalar bar for this color map if no visible data is colored by it.

HideScalarBarIfNotNeeded(vtkBlockColorsLUT, renderView1)


# rescale color and/or opacity maps used to include current data range

canex2Display.RescaleTransferFunctionToDataRange(True, False)


# show color bar/color legend

canex2Display.SetScalarBarVisibility(renderView1, True)


# get color transfer function/color map for 'VEL'

vELLUT = GetColorTransferFunction('VEL')


It is hiding the scalar bar for vtkBlockColors since that is what the data
used to be colored by.  I think your problem will be solved by using the
GetDisplayProperties and ColorBy functions rather than setting
ColorArrayName.

HTH,
Shawn

On Sat, May 27, 2017 at 1:35 PM, Richard Kalhoefer <
kalhoefer at physik.uni-kiel.de> wrote:

> Hey,
>
> I have a python script that opens a Legacy VTK file that contains two
> scalar arrays of the same length (real and imaginary part of a wave
> function) and then adjusts the camera settings, representation and color.
> My transfer functions seem to be ignored and I just get full opacity and
> black color. Running the script inside the GUI's python shell gives the
> same result, but when I then change the array under Display->Coloring to
> the other one and back again. everything looks as expected. So my question
> is: What is this GUI element doing beyond "GetRepresentation(reader,
> view).ColorArrayName = ['POINTS', arrayname]" and how can I do the same
> within the python script?
>
> Kind regards
> Richard Kalhöfer
>
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