Hi Andrew,
I see a couple of things in your script. First is normals and scalars
are data set attributes. so you need to access them through one of those
classes, ex vtkPointData.
Correct me if I'm wrong but, although in VTK 6 you generally don't need
to shallow copy the input to filters I think it's still probably a bad
practice to modify the arrays in the input dataset.
I think what you want to do is copy the geometric structure of the input
and then make a deep copy of normals and scalars arrays, and rename the
copys. Copy structure rather than shallow copy since with a shallow copy
you'd still end up modifying the arrays in the input dataset.
Finally scalars and normals may not be present. I know you'd probably
handle that in your final script, ;-)
given all that, here's what I came up with:
def copyAndNameArray(da, name):
if da is not None:
outda = da.NewInstance()
outda.DeepCopy(da)
outda.SetName(name)
return outda
else:
return None
pdi = self.GetPolyDataInput()
pdo = self.GetPolyDataOutput()
pdo.CopyStructure(pdi)
pdo.GetPointData().SetNormals( \
copyAndNameArray(pdi.GetPointData().GetNormals(), 'Normals'))
pdo.GetPointData().SetScalars( \
copyAndNameArray(pdi.GetPointData().GetScalars(), 'Scalars'))
print 'Normals=%s'%(str(pdo.GetPointData().GetNormals()))
print 'Scalars=%s'%(str(pdo.GetPointData().GetScalars()))
Curious to hear from other developers as to if I'm on target about not
modifying arrays in the input or if this is overkill given the new VTK 6
pipeline.
Burlen
On 05/30/2014 07:29 PM, Andrew Maclean wrote:
I have a source object that produces a polydata object. Unfortunately
the normals and scalars are unnamed. How do I access these and name
them in ParaView.
I thought something like this may work in a Programmable Filter:
pdi = self.GetPolyDataInput()
pdo = self.GetPolyDataOutput()
pdi.GetNormals().SetName('Normals')
pdi.GetScalars().SetName('Scalars')
pdo = pdi
However, I can't see the array names.
This sort of thing works Ok in a Python Script:
# Name the arrays
randomHillsSource.GetOutput().GetPointData().GetNormals().SetName('Normals')
randomHillsSource.GetOutput().GetPointData().GetScalars().SetName('Scalars')
# pd = randomHillsSource.GetOutput().GetPointData()
# print pd
Is it possible to do this on ParaView?
Thanks in advance for any help.
Andrew
--
___________________________________________
Andrew J. P. Maclean
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