[vtk-developers] Call for Comments: Ascii representation of floats and doubles in files

[Berk Geveci]

Given that this is IO specific, I would vote for IO/Core. No need to
pollute Common/Core more than it already is (which is a lot IMO).

On Thu, Mar 1, 2018 at 10:36 AM, Will Schroeder <will.schroeder at kitware.com>
wrote:

> If it works why mess with success? Where would this class (vtk
> NumberToString) be placed, in Common/Core (like vtkIndent) or in some IO
> directory like VTK/IO/Core?
>
> On Thu, Mar 1, 2018 at 10:06 AM, Bill Lorensen <bill.lorensen at gmail.com>
> wrote:
>
>> Folks,
>>
>> I'm working on some examples to save/restore camera, polydata,
>> property, etc. in XML files. The files can be saved as binary or
>> ascii. If I save/restore the info in binary, I get the same values for
>> the saved info. But, to no surprise, when I save the same data in
>> ascii, I don't get the same values. This is because the file writing
>> code does not write enough significant digits.
>>
>> In ITK we solved this problem many years ago. ITK uses a reduced
>> version of the Google double-conversion library,
>> https://github.com/google/double-conversion.
>>
>> We added a small class to ITK that uses the library. The class,
>> itkNumberToString, has a simple API. To convert floating and fixed
>> point numbers to ascii without numerical precision erros,
>>
>> For example, to convert a float,
>> #include "itkNumberToString.h:
>> itk::NumberToString<float> convert;
>> float a = 1.0f/3.0f;
>> std::cout << convert(a) << std::endl;
>>
>> I propose a similar approach in VTK.
>>
>> Comments please,
>>
>> Bill
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>
>
> --
> William J. Schroeder, PhD
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