[Paraview] Visualising image data

[Bruce Jones]

Thanks for the response David. Could you elaborate on this? I am not sure
how to do what you are suggesting.

Cheers,
Bruce

On Thu Jan 22 2015 at 11:46:02 AM David E DeMarle <dave.demarle at kitware.com>
wrote:

> Announce the whole extent in the RequestInformation script section.
> That should do the trick.
>
>
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
> On Thu, Jan 22, 2015 at 11:17 AM, Bruce Jones <bruce.david.jones at gmail.com
> > wrote:
>
>> Hi all,
>>
>> I'm working on a programmable filter that needs to produce a vtkImageData
>> object. So far it appears to work, inspection of the properties panel shows
>> the object has the correct number of points/cells and the data array
>> contains the correct data. However I cannot get a visualisation with any of
>> the representations (surface, outline, wireframe etc). Curiously, if i set
>> the display to my data array then the color bar appears with the correct
>> values, but still not visualization.
>>
>> I am using the following code to produce the image data object.
>>
>> from vtk import *
>>
>> output = self.GetOutputDataObject(0);
>>
>> # Create a VTK Grid
>> grid = vtkImageData()
>> grid.SetOrigin(0, 0, 0) # default values
>> dx=10;
>> grid.SetSpacing(dx, dx, dx)
>> grid.SetDimensions(5, 8, 10) # number of points in each direction
>> # print grid.GetNumberOfPoints()
>> # print grid.GetNumberOfCells()
>> array = vtkDoubleArray()
>> array.SetNumberOfComponents(1) # this is 3 for a vector
>> array.SetNumberOfTuples(grid.GetNumberOfPoints())
>> for i in range(grid.GetNumberOfPoints()):
>>     if i < 200:
>>         array.SetValue(i, 1)
>>     else:
>>         array.SetValue(i, 2)
>>
>> grid.GetPointData().AddArray(array)
>> # print grid.GetPointData().GetNumberOfArrays()
>> array.SetName("unit array")
>> output.ShallowCopy(grid);
>>
>> Cheers,
>> Bruce
>>
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>
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