I responded to Alan directly, but I'll repeat the response for the list as well.
The reason why you see white lines is that the alpha parameter causes the
Delaunay 3D filter to create lines (or triangles) if they fit within the
circumsphere smaller than alpha and the tetrahedron does not. These lines are
rendered without shading, so they show up as stark white streaks in the
rendering.
The most straightforward solution to get what you want is to filter out any
cells that are not tetrahedra. I don't know of a filter designed for that, but
you can do it with a Programmable Filter with the following script. (Watch out
for any newlines that an email program might insert.)
from paraview.vtk import vtkFiltersCore
input = self.GetUnstructuredGridInput()
output = self.GetUnstructuredGridOutput()
typesArray = input.GetCellTypesArray()
typesArray.SetName('__types__')
inputWithTypes = vtk.vtkUnstructuredGrid()
inputWithTypes.ShallowCopy(input)
inputWithTypes.GetCellData().AddArray(typesArray)
threshold = vtk.vtkFiltersCore.vtkThreshold()
threshold.SetInputData(inputWithTypes)
threshold.SetInputArrayToProcess(0,0,0,'vtkDataObject::FIELD_ASSOCIATION_CELLS','__types__')
threshold.ThresholdBetween(9.5, 10.5)
threshold.Update()
thresholdOutput = threshold.GetOutput()
output.ShallowCopy(thresholdOutput)
output.GetCellData().RemoveArray('__types__')
-Ken
From: <Scott>, Walter Scott <[email protected]<mailto:[email protected]>>
Date: Thursday, April 25, 2013 2:00 PM
To: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Subject: [EXTERNAL] [Paraview] Delauney 3d
I have a csv file of points. After running it through the table to point
filter, I am running the delauney 3d filter on it. The dataset looks like a
watermelon rind. Unfortunately, the red part of the watermelon is solid.
Fortunately, changing the alpha variable fixes this – deleting the red “meat”
part of the watermelon.
My issue is that we are ending up with lots of white lines all over the outside
of the solid object. Think of my water melon rind as the outside green layer
with the white rind, covered with white spider webs.
Has anyone seen this, and is there a fix or workaround?
Thanks,
Alan
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