[Paraview] SafeDownCast to vtkDoubleArray fails

[Burlen Loring]

Natalie Happenhofer wrote:
> Hi!
> I need to cast my Point Data to a vtkDoubleArray, but it fails:
>
> vtkPointData *scaldat = input -> GetPointData();
> vtkDoubleArray *scalars = vtkDoubleArray::New();
> scalars = vtkDoubleArray::SafeDownCast(scaldat);
> if(!scalars) vtkErrorMacro("SafeDownCast to vtkDoubleArray failed");
PointData is not an array, it's a container of arrays. To get one of its 
arrays see the GetArray methods.
http://www.vtk.org/doc/nightly/html/classvtkFieldData.html#888a6492210426d4ba4d358b87ab198f

To find this in the documentation you would have to use the inheritance 
diagrams. PointData "is a" DataSetAttibutes "is a" FieldData and so on.

>
> and everytime I run the program I get that vtkErrorMacro.
> as far as I know from the input files, the PointData should be float, 
> but casting to vtkFloatArray fails as well. Why? and what can I do 
> about it?
>
> thx a lot,
> NH
>
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-- 
Burlen Loring
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x137