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

[Will Schroeder]

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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