[Paraview] Pvbatch: Volume rendering a thresholded unstructured grid

[Jesus Pulido]

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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