[Paraview] Pvbatch: Volume rendering a thresholded unstructured grid

[Utkarsh Ayachit]

You're getting that error because more likely than not, your threshold
range is such that no data is getting passed through. Ensure that the
the Threshold1.ThresholdRange is set to a valid range so that  at
least some cells are passed through.

Utaksrh

On Mon, Aug 29, 2011 at 8:27 PM, Jesus Pulido <jpulido at ucdavis.edu> wrote:
> I omitted that line before because I was getting the following error.
> Readding it gives this error:
> Traceback (most recent call last):
>   File "/home/user/DNS/volume.py", line 40, in <module>
>     DataRepresentation2.ColorArrayName = 'volume_scalars'
>   File
> "/home/user/Programs/ParaView-3.11.1-git/bin/Utilities/VTKPythonWrapping/site-packages/paraview/servermanager.py",
> line 212, in __setattr__
>     setter(self, value)
>   File
> "/home/user/Programs/ParaView-3.11.1-git/bin/Utilities/VTKPythonWrapping/site-packages/paraview/servermanager.py",
> line 2267, in setProperty
>     return self.SetPropertyWithName(propName, value)
>   File
> "/home/user/Programs/ParaView-3.11.1-git/bin/Utilities/VTKPythonWrapping/site-packages/paraview/servermanager.py",
> line 267, in SetPropertyWithName
>     prop.SetData(arg)
>   File
> "/home/user/Programs/ParaView-3.11.1-git/bin/Utilities/VTKPythonWrapping/site-packages/paraview/servermanager.py",
> line 695, in SetData
>     raise ValueError("Could not locate array %s in the input." % arr)
> ValueError: Could not locate array volume_scalars in the input.
>
> Jesus
>
> On Mon, Aug 29, 2011 at 3:53 PM, Utkarsh Ayachit
> <utkarsh.ayachit at kitware.com> wrote:
>>
>> Try adding:
>>
>> DataRepresentation2.ColorArrayName = 'volume_scalars'
>>
>> Utkarsh
>>
>> On Wed, Aug 24, 2011 at 7:02 PM, Jesus Pulido <jpulido at ucdavis.edu> wrote:
>> > I am trying to volume render an unstructured grid of points using
>> > pvbatch
>> > but I am getting an error:
>> >
>> > ERROR: In
>> >
>> > /home/user/Programs/ParaView-3.11.1-git/ParaView/VTK/VolumeRendering/vtkUnstructuredGridVolumeRayCastMapper.cxx,
>> > line 211
>> > vtkUnstructuredGridVolumeRayCastMapper (0x2473a40): Can't use the ray
>> > cast
>> > mapper without scalars!
>> >
>> > When trying to use Bunyk Ray casting
>> >
>> > and
>> >
>> > ERROR: In
>> >
>> > /home/user/Programs/ParaView-3.11.1-git/ParaView/VTK/VolumeRendering/vtkOpenGLProjectedTetrahedraMapper.cxx,
>> > line 237
>> > vtkOpenGLProjectedTetrahedraMapper (0x2ab3190): Can't use projected
>> > tetrahedra without scalars!
>> >
>> > When trying to use Projected tetra.
>> >
>> > I am using the "latest" git version as of today. I also tried with
>> > PV3.10.1
>> > 64bit linux binary and I am having the same error with pvbatch.
>> >
>> >
>> > Here is the script that I am using in pvbatch. I generated this script
>> > with
>> > the help from using python trace within paraview (where the rendering
>> > works). I think it tries to reference the data under
>> >
>> > Threshold1.Scalars = ['POINTS', 'volume_scalars']
>> >
>> > but even if I comment this line out of my script I obtain the same error
>> > as
>> > above so somehow it's not able to reference the scalar points.
>> > --------
>> > try: paraview.simple
>> > except: from paraview.simple import *
>> > paraview.simple._DisableFirstRenderCameraReset()
>> >
>> > wavelet_ = XMLImageDataReader( FileName=['/home/wavelet.vti'] )
>> >
>> > wavelet_.CellArrayStatus = []
>> > wavelet_.PointArrayStatus = ['volume_scalars']
>> >
>> > RenderView4 = GetRenderView()
>> > RenderView4.CameraViewUp = [0.0, 0.0, 1.0]
>> > RenderView4.CameraPosition = [-725.7466298125642, 127.5, 127.5]
>> > RenderView4.CameraFocalPoint = [127.5, 127.5, 127.5]
>> > RenderView4.CameraClippingRange = [590.9891635144385,
>> > 1185.4328292597527]
>> > RenderView4.Background = [0.0, 0.0, 0.0]
>> > RenderView4.CenterAxesVisibility = 0
>> > RenderView4.OrientationAxesVisibility = 0
>> > RenderView4.ViewSize = [800, 600]
>> >
>> > SetActiveSource(wavelet_)
>> > Threshold1 = Threshold()
>> >
>> > a1_volume_scalars_PVLookupTable = GetLookupTableForArray(
>> > "volume_scalars",
>> > 1, RGBPoints=[1.9, 0.0, 1.0, 0.0, 1.95, 1.4972662149337713e-07, 1.0,
>> > 0.0014876325368879406, 2.0, 0.0, 0.996078431372549, 0.0, 2.05,
>> > 1.6337586200641548e-07, 1.0, 0.0015525676008689975, 2.1,
>> > 1.2838779441233928e-07, 1.0, 0.0013859544585118407] )
>> > a1_volume_scalars_PiecewiseFunction = CreatePiecewiseFunction()
>> > a1_volume_scalars_PiecewiseFunction.Points = [1.9, 0.1, 1.95, 0.5, 2.0,
>> > 1.0,
>> > 2.05, 0.5, 2.1, 0.1]
>> >
>> > Threshold1 = GetActiveSource()
>> > Threshold1.Scalars = ['POINTS', 'volume_scalars']
>> > Threshold1.ThresholdRange = [1.9, 2.1]
>> >
>> > DataRepresentation2 = Show()
>> > DataRepresentation2 = GetDisplayProperties(Threshold1)
>> > DataRepresentation2.EdgeColor = [0.0, 0.0, 0.5000076295109483]
>> > DataRepresentation2.SelectMapper = 'Fixed point'
>> > DataRepresentation2.ScalarOpacityFunction =
>> > a1_volume_scalars_PiecewiseFunction
>> > DataRepresentation2.ScalarOpacityUnitDistance = 7.74209043877865
>> > DataRepresentation2.LookupTable = a1_volume_scalars_PVLookupTable
>> > DataRepresentation2.Representation = 'Volume'
>> > DataRepresentation2.SelectMapper = 'Bunyk ray cast'
>> >
>> > Render()
>> >
>> > -----
>> >
>> >
>> > Jesus
>> >
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>
>
>
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