[Paraview] no probe over line output with paraview scripting

[Jérôme]

Hi Matt,

By quickly reading your code, I understand that you try to put
the ouput of the PlotOverLine on the the input of an image writer.
The mistake, IMHO, is that PlotOverLine outputs a vtkPolyData
(Polygonal Mesh in ParaView), that's why the writer doesn't want it as
input (it expects a vtkImageData instead).

I think that what you want is a screenshot of the plot. You should look
in that direction. Sort of "Offscreen screenshot" ?? Don't know...

HTH
Jerome

2010/10/29  <m.c.wilkins at massey.ac.nz>:
>
> Hi,
>
> As promised, I have another question!
>
> The code below can render a picture to the screen fine.  But I would
> like to send the picture to a file, without rendering anything to the
> screen.  I know I can put
>   WriteImage('/tmp/foo.png')
> at the end to save the output, but that is after I've popped up an
> image.
>
> I did find a powerpoint by David E DeMarle about paraview scripting
> with this in it:
>
> writer = servermanager.writers.PNGWriter()
> writer.FileName = '/tmp/foo.png'
> writer.Input = pl
> writer.UpdatePipeline()
>
> But when I try that I get:
> ERROR: In /scratch/pv/ParaView/VTK/IO/vtkPNGWriter.cxx, line 54
> vtkPNGWriter (0xb108028): Write:Please specify an input!
> which is odd since I thought I had set the input via writer.Input = pl
>
> My full code was
>
> from paraview.simple import *
> reader = servermanager.sources.XMLUnstructuredGridReader(FileName = "/var/tmp/file.vtu")
> pl = PlotOverLine(Input = reader)
> pl.Source.Point1 = [-7000, -5000, 0]
> pl.Source.Point2 = [4300, 6300, 1111.75]
> writer = servermanager.writers.PNGWriter()
> writer.FileName = '/tmp/foo.png'
> writer.Input = pl
> c = CreateXYPlotView()
> d = Show()
> d.XArrayName = 'arc_length'
> d.SeriesVisibility = ['namecolours (0)', '0', 'namecolours (1)', '0',
> 'namecolours (2)', '0', 'vtkValidPointMask', '0', 'arc_length', '0']
> d.UseIndexForXAxis = 0
> writer.UpdatePipeline()
>
> I feel pretty bad about always asking questions on this list, but I
> just can't seem to find documentation, or if I do, it is for a
> slightly different setup (as in David E DeMarle's powerpoint for
> instance).  So, if I am just missing some good doco source, please
> point me that way!
>
> Thanks for any help!
>
> Matt Wilkins
>
> On Fri, Oct 29, 2010 at 01:22:24PM +1300, m.c.wilkins at massey.ac.nz wrote:
>>
>> Hi Utkarsh,
>>
>> Thanks, I am using 3.9, but I wasn't using paraview.simple, just
>> following the examples in the Python Scripting chapter in the ParaView
>> Guide.  Using paraview.simple does make things simpler ;-)  and indeed
>> I can get it to work.
>>
>> For the record this works fine for me:
>>
>> from paraview.simple import *
>> reader = servermanager.sources.XMLUnstructuredGridReader(FileName = "/var/tmp/file.vtu")
>> pl = PlotOverLine(Input = reader)
>> pl.Source.Point1 = [-7000, -5000, 0]
>> pl.Source.Point2 = [4300, 6300, 1111.75]
>> CreateXYPlotView()
>> d = Show()
>> d.XArrayName = 'arc_length'
>> d.SeriesVisibility = ['namecolours (0)', '0', 'namecolours (1)', '0', 'namecolours (2)', '0', 'vtkValidPointMask', '0', 'arc_length', '0']
>> d.UseIndexForXAxis = 0
>> Render()
>>
>> OK, so got past this problem, more to come I expect!
>>
>> Thank you
>>
>> Matt Wilkins
>>
>> On Thu, Oct 28, 2010 at 09:08:50AM -0600, Utkarsh Ayachit wrote:
>> > What version of ParaView are you using? Here's my script with 3.9
>> > (should work with 3.8 too).
>> >
>> > Wavelet()
>> > pl = PlotOverLine()
>> > pl.Source.Point1 = [-10, -10, -10]
>> > pl.Source.Point2 = [10, 10, 10]
>> > CreateXYPlotView()
>> > Show()
>> > Render()
>> >
>> > Utkarsh
>> >
>> >
>> > On Wed, Oct 27, 2010 at 2:30 PM,  <m.c.wilkins at massey.ac.nz> wrote:
>> > >
>> > > Hi,
>> > >
>> > > I am driving paraview via pvpython, and trying to do a probe over
>> > > line.  I would think this is quite easy, but it is proving
>> > > frustratingly difficult!  This is what I am typing
>> > >
>> > > from paraview import servermanager
>> > > c = servermanager.Connect()
>> > > reader = servermanager.sources.XMLUnstructuredGridReader(FileName =
>> > > "/var/tmp/file.vtu")
>> > > pl = servermanager.filters.ProbeLine(Input = reader)
>> > > pl.Source.Point1 = [-7000, -5000, 0]
>> > > pl.Source.Point2 = [4300, 6300, 1111.75]
>> > > view = servermanager.CreateRenderView()
>> > > rep = servermanager.CreateRepresentation(pl, view)
>> > > pl.UpdatePipeline()
>> > > view.ResetCamera()
>> > > view.StillRender()
>> > >
>> > > I get a nice picture of the x axis and a short y axis, but nothing
>> > > plotted.  I try a probe over line in paraview with the same beginning
>> > > and end points and I get data displayed.
>> > >
>> > > I am not specifying what variables should be displayed for the probe
>> > > over line, so perhaps nothing is getting displayed?  I cannot for the
>> > > life of me find how I would specify what to display though.  If I do a
>> > > probe over line in paraview with the Python Shell Trace running, I can
>> > > see that the SeriesVisibility attribute in the
>> > > paraview.servermanager.XYChartRepresentation object is being set.
>> > > However I don't have that representation, I only have the 'rep' above,
>> > > and that doesn't have a SeriesVisibility attribute.
>> > >
>> > > Thank you for any help, even if it is a pointer to where this is
>> > > documented!
>> > >
>> > > Matt
>> > >
>> > >
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