[Paraview] Access Point Data - something wrong

[Axtmann Gabriel]

Hi guys,

I am trying to calculate the gradient of an unstructed data set saved in 
vtk format with the function in the following:

Somehow I am not able to access the PointData of the solution. The error 
is always


*    Grad_DMDu = dataAdp.PointData['Grad_DMDu']*
     obj._dataset.Set(dataset.VTKObject)
     TypeError: Set argument 1: method requires a VTK objec


So what am I doing wrong here?

Thanks in advance

############################################
def Cal_Dissp(DMDmodeFile,DMDmodeName, nu):
     """
     Calculate the (Pseudo) dissipation with paraview vtk, and return data
     """
     print('   Calculate mode gradient ...')
     import paraview.simple as ps
     import vtk.numpy_interface.dataset_adapter as dsa
     ps.paraview.simple._DisableFirstRenderCameraReset()


     xmlUnstructerdGrReader = 
ps.XMLUnstructuredGridReader(FileName=[DMDmodeFile])
     xmlUnstructerdGrReader.PointArrayStatus = [ DMDmodeName ]

     gradientOfUnstructuredDataSet1 = 
ps.GradientOfUnstructuredDataSet(Input=xmlUnstructerdGrReader)
     gradientOfUnstructuredDataSet1.ScalarArray = ['POINTS', DMDmodeName]
     gradientOfUnstructuredDataSet1.ResultArrayName = 'Grad_DMDu'

     gradientOfUnstructuredDataSet1.UpdatePipeline()

     rawData = ps.servermanager.Fetch(gradientOfUnstructuredDataSet1)
     rawData = rawData.Get
     dataAdp = dsa.WrapDataObject(rawData)

*    Grad_DMDu = dataAdp.PointData['Grad_DMDu'] - > Here comes the error*

     #release paraview ocupied memory
     del xmlUnstructerdGrReader
     ps.Disconnect()
     ps.Connect()

     print('   Calculate dissipation ...')
     D= ..........

     return D
############################################
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