[vtkusers] [EXTERNAL] Assiging attributes to vtk polydata

[Gerrick Bivins]

Hi Chiranjib,
You could use vtkAssignAttribute to set “foo” as the “Active Scalar Array of the Point Data” , as in the example,
which is useful in situations where algorithms/filters that are consuming the output of vtkAssignAttribute are setup
to work on the “Active Scalar”( http://www.vtk.org/doc/nightly/html/classvtkDataSetAttributes.html#a626aeb4cf7f739d11068a464c968db8c ).

I’ve used vtkAssignAttribute in instances where I needed to calculate a new array via vtkArrayCalculator.
I set the output array of the calculator as the active scalar using vtkAssignAttribute,
so that it would be used as the “input array to process” in a vtkContourFilter, for example.

Gerrick

From: vtkusers [mailto:vtkusers-bounces at vtk.org] On Behalf Of Chiranjib Sur
Sent: Wednesday, March 11, 2015 11:32 AM
To: vtkusers at vtk.org
Subject: [EXTERNAL] [vtkusers] Assiging attributes to vtk polydata

Hi All,
Once I generate the vtkpolydata, how do I assign any particular attributes (say of type scaler and named as "density") to the dataset.

I looked into the examples using vtkAssignAttribute (http://www.vtk.org/doc/nightly/html/classvtkAssignAttribute.html)

Can anyone please explain what does this statement means from the page :


aa->Assign("foo", vtkDataSetAttributes::SCALARS,

           vtkAssignAttribute::POINT_DATA);

Once the point attributes are assigned, does it mean that each point data will contain the information of the attributes in the vtk (.vtp) file ?

Thanks much.

Chiranjib

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