[vtkusers] Cast doubt on method vtkFloatArray::GetTuple

[Francois Bertel]

GetTuple() is defined in the superclass vtkDataArray. If you already safedowncast to a float array, you can use extra methods specific to float array, like GetTupleValue, SetTupleValue,GetValue,SetValue,InsertValue,
InsertNextValue:


vtkFloatArray
http://www.vtk.org/doc/nightly/html/classvtkFloatArray.html


superclass vtkDataArray

http://www.vtk.org/doc/nightly/html/classvtkDataArray.html

Renato N. Elias wrote:
> 
> Just a minor doubt (or curiosity):
> 
> Since vtkFloatArray is a float type, why (or how) does the GetTuple 
> method return a double?
> 
> I'm using a vtkFloatArray to point to the output of a normals generation 
> filter. In this case, I had to performe a "SafeDownCast" from the output 
> of the normals filter to the vtkFloatArray. After that, when I was 
> getting the tuples from vtkFloatArray I noticed that the method returns 
> a double (again). Well, although not being a C++ programmer, it seemed a 
> bit weird. Is it safe (or even common in C++)?
> 
> Thanks for any clarification
> 
> Renato.
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