[vtk-developers] isnan

[Goodwin Lawlor]

Michael Halle wrote:
> I've got a dataset that uses NaN as a data value to indicate invalid 
> pixels. A couple of places in VTK, such as vtkDataArray's GetRange() are 
> fooled by this value.  A small test for NaN pixels would fix this 
> problem, and native isnan() and std::isnan() don't seem to introduce 
> significant preformance hits. (vtkDataArray could also possibly keep 
> track of the existence of NaN values to help other classes know how to 
> deal with them).

Yeah - vtkCurvatures could do with using NaN as a data value. How do NaN 
values get mapped by the LUT though?

Goodwin