[Paraview] Color by array component from Python script not working

Wed Aug 26 11:58:36 EDT 2015

Hi Cory,

Yes, your script works on my machine.

Then, after testing your script, I deleted my ParaView4.3.1.ini file and
now my script works too :-) Not sure what happened.

Yes I have a vector with that many components for a time animation.

Thanks for your attention.

Best,
Matei

On Wed, Aug 26, 2015 at 10:13 AM Cory Quammen <cory.quammen at kitware.com>
wrote:

> Hi Matei,
>
> Do your vectors really have up to 672 components? That's fine, just
> surprisingly high.
>
> Changing among vector components seems to be working fine in ParaView
> 4.3.1 On Windows. Here is the test script I ran.
>
> #### import the simple module from the paraview
> from paraview.simple import *
> #### disable automatic camera reset on 'Show'
> paraview.simple._DisableFirstRenderCameraReset()
>
> # create a new 'Sphere'
> sphere1 = Sphere()
>
> # get active view
> renderView1 = GetActiveViewOrCreate('RenderView')
> # uncomment following to set a specific view size
> # renderView1.ViewSize = [659, 468]
>
> # show data in view
> sphere1Display = Show(sphere1, renderView1)
> # trace defaults for the display properties.
> sphere1Display.ColorArrayName = [None, '']
>
> # reset view to fit data
> renderView1.ResetCamera()
>
> # set scalar coloring
> ColorBy(sphere1Display, ('POINTS', 'Normals'))
>
> # rescale color and/or opacity maps used to include current data range
> sphere1Display.RescaleTransferFunctionToDataRange(True)
>
> # show color bar/color legend
> sphere1Display.SetScalarBarVisibility(renderView1, True)
>
> # get color transfer function/color map for 'Normals'
> normalsLUT = GetColorTransferFunction('Normals')
>
> # get opacity transfer function/opacity map for 'Normals'
> normalsPWF = GetOpacityTransferFunction('Normals')
>
> #change array component used for coloring
> normalsLUT.RGBPoints = [-0.9749279022216797, 0.231373, 0.298039, 0.752941,
> 0.0, 0.865003, 0.865003, 0.865003, 0.9749279022216797, 0.705882, 0.0156863,
> 0.14902]
> normalsLUT.VectorMode = 'Component'
>
> # Properties modified on normalsPWF
> normalsPWF.Points = [-0.9749279022216797, 0.0, 0.5, 0.0,
> 0.9749279022216797, 1.0, 0.5, 0.0]
>
> normalsLUT.VectorComponent = 0
> RenderAllViews()
> SaveScreenshot('component0.png')
>
> #change array component used for coloring
> normalsLUT.VectorComponent = 1
> RenderAllViews()
> SaveScreenshot('component1.png')
>
> #change array component used for coloring
> normalsLUT.RGBPoints = [-1.0, 0.231373, 0.298039, 0.752941, 0.0, 0.865003,
> 0.865003, 0.865003, 1.0, 0.705882, 0.0156863, 0.14902]
> normalsLUT.VectorComponent = 2
> RenderAllViews()
> SaveScreenshot('component2.png')
>
> # Properties modified on normalsPWF
> normalsPWF.Points = [-1.0, 0.0, 0.5, 0.0, 1.0, 1.0, 0.5, 0.0]
>
> #### saving camera placements for all active views
>
> # current camera placement for renderView1
> renderView1.CameraPosition = [0.0, 0.0, 3.2903743041222895]
> renderView1.CameraParallelScale = 0.8516115354228021
>
> #### uncomment the following to render all views
> RenderAllViews()
> # alternatively, if you want to write images, you can use
> SaveScreenshot(...).
>
> Can you confirm this works on your ParaView installation? There might be
> some errors about file writing if the current working directory on your
> system is write-protected - you can ignore those.
>
> Cheers,
> Cory
>
>
> On Thu, Aug 20, 2015 at 6:54 PM, Matei Stroila <matei.stroila at gmail.com>
> wrote:
>
>> Hi,
>>
>> I am using ParaView 4.3.1 on Mac OSX.
>> I used to be able to loop through the components of an attribute array
>> and change the color of the representation. I am not sure why this is no
>> longer working (don't recall when it was working, maybe 4.2?). It does work
>> from GUI. This is the GUI trace for changing the color attribute three
>> times:
>>
>> #### import the simple module from the paraview
>>
>> from paraview.simple import *
>>
>> #### disable automatic camera reset on 'Show'
>>
>> paraview.simple._DisableFirstRenderCameraReset()
>>
>>
>> # get color transfer function/color map for 'SpeedArray'
>>
>> speedArrayLUT = GetColorTransferFunction('SpeedArray')
>>
>> speedArrayLUT.InterpretValuesAsCategories = 0
>>
>> speedArrayLUT.EnableOpacityMapping = 0
>>
>> speedArrayLUT.RGBPoints = [0.0, 1.0, 0.0, 0.0, 150.0, 0.0, 0.0, 1.0]
>>
>> speedArrayLUT.UseLogScale = 0
>>
>> speedArrayLUT.LockScalarRange = 1
>>
>> speedArrayLUT.ColorSpace = 'HSV'
>>
>> speedArrayLUT.UseBelowRangeColor = 0
>>
>> speedArrayLUT.BelowRangeColor = [0.0, 0.0, 0.0]
>>
>> speedArrayLUT.UseAboveRangeColor = 0
>>
>> speedArrayLUT.AboveRangeColor = [1.0, 1.0, 1.0]
>>
>> speedArrayLUT.NanColor = [0.498039, 0.498039, 0.498039]
>>
>> speedArrayLUT.Discretize = 1
>>
>> speedArrayLUT.NumberOfTableValues = 256
>>
>> speedArrayLUT.ScalarRangeInitialized = 1.0
>>
>> speedArrayLUT.HSVWrap = 0
>>
>> speedArrayLUT.VectorComponent = 96
>>
>> speedArrayLUT.VectorMode = 'Component'
>>
>> speedArrayLUT.AllowDuplicateScalars = 1
>>
>> speedArrayLUT.Annotations = []
>>
>> speedArrayLUT.IndexedColors = []
>>
>>
>> # get opacity transfer function/opacity map for 'SpeedArray'
>>
>> speedArrayPWF = GetOpacityTransferFunction('SpeedArray')
>>
>> speedArrayPWF.Points = [0.0, 0.0, 0.5, 0.0, 150.0, 1.0, 0.5, 0.0]
>>
>> speedArrayPWF.AllowDuplicateScalars = 1
>>
>> speedArrayPWF.ScalarRangeInitialized = 1
>>
>>
>> #change array component used for coloring
>>
>> speedArrayLUT.RGBPoints = [2.0, 1.0, 0.0, 0.0, 134.079086144, 0.0, 0.0, 1.0]
>>
>> speedArrayLUT.VectorComponent = 111
>>
>>
>> # Properties modified on speedArrayPWF
>>
>> speedArrayPWF.Points = [2.0, 0.0, 0.5, 0.0, 134.079086144, 1.0, 0.5, 0.0]
>>
>>
>> #change array component used for coloring
>>
>> speedArrayLUT.RGBPoints = [2.0, 1.0, 0.0, 0.0, 131.302099153, 0.0, 0.0, 1.0]
>>
>> speedArrayLUT.VectorComponent = 127
>>
>>
>> # Properties modified on speedArrayPWF
>>
>> speedArrayPWF.Points = [2.0, 0.0, 0.5, 0.0, 131.302099153, 1.0, 0.5, 0.0]
>>
>>
>> #change array component used for coloring
>>
>> speedArrayLUT.RGBPoints = [2.0, 1.0, 0.0, 0.0, 143.468496117, 0.0, 0.0, 1.0]
>>
>> speedArrayLUT.VectorComponent = 175
>>
>>
>> # Properties modified on speedArrayPWF
>>
>> speedArrayPWF.Points = [2.0, 0.0, 0.5, 0.0, 143.468496117, 1.0, 0.5, 0.0]
>>
>>
>> #### uncomment the following to render all views
>>
>> # RenderAllViews()
>>
>> # alternatively, if you want to write images, you can use SaveScreenshot(...).
>>
>>
>> I try to do the same from a script, this time keeping the color map the
>> same (not rescaling), and that does not work, the color of the geometry
>> stays the same:
>>
>> ###############
>>
>> *speedArrayLUT = GetColorTransferFunction('SpeedArray')*
>> *speedArrayLUT.RGBPoints = [0.0, 1.0, 0.0, 0.0, 150.0, 0.0, 0.0, 1.0]*
>> *speedArrayLUT.LockScalarRange = 1*
>> *speedArrayLUT.ColorSpace = 'HSV'*
>> *speedArrayLUT.NanColor = [0.498039, 0.498039, 0.498039]*
>> *speedArrayLUT.ScalarRangeInitialized = 1.0*
>> *speedArrayLUT.VectorComponent = 671*
>> *speedArrayLUT.VectorMode = 'Component'*
>>
>> *speedArrayPWF = GetOpacityTransferFunction('SpeedArray')*
>> *speedArrayPWF.Points = [0.0, 0.0, 0.5, 0.0, 150.0, 1.0, 0.5, 0.0]*
>> *speedArrayPWF.ScalarRangeInitialized = 1*
>>
>> *attributesLUTColorBar = GetScalarBar(speedArrayLUT, renderView1)*
>> *attributesLUTColorBar.Title = 'Speed (km/h)'*
>>
>> *for i in range_15min: *
>>
>> * speedArrayLUT.VectorComponent = i*
>> *        Render()*
>> #################
>>
>> If I add:
>>
>> *readerDisplay.RescaleTransferFunctionToDataRange() *
>>
>> in the loop, I do see the range of the color bar changing with each
>> iteration, but the color of the rendered geometry does not change. Is there
>> a way to force an update on the readerDisplay (where, *readerDisplay =
>> GetDisplayProperties(reader, view=renderView1)*)
>>
>> Thanks for any suggestions.
>>
>> Matei
>>
>>
>>
>>
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>
>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>
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