[Paraview] ParaView 3.98 NRRD reader does not support ASCII encoding

[Moreland, Kenneth]

I hadn't any plans to implement ASCII encoding in the NRRD reader, and I
don't know of anyone else making any edits to it.


The problem with ASCII encoding is that there is no straightforward way to
implement parallel reading of the data (because offsets cannot be
determined), and one of the main practical functions of the NRRD reader is
to be able to read very large raw arrays from files.

I wouldn't think it would be too hard to implement ASCII encodings.  It
could just fail or do something stupid if run in parallel.

-Ken

On 1/4/13 2:15 PM, "Russell M. Taylor II" <taylorr at cs.unc.edu> wrote:

>The NRRD specification
>(http://teem.sourceforge.net/nrrd/format.html#general.4, paragraph 4)
>states that all readers must support raw and ASCII encoding, but when
>I open a NRRD file with either ascii or ASCII encoding, ParaView
>reports ERROR: In 
>C:\DBD\pvs-x64\paraview\src\paraview\VTK\IO\Image\vtkNrrdReader.cxx,
>line 377 vtkPNrrdReader (000000000CF65C70): Unsupported encoding: ascii.
>
>If I lie to it and tell it that it is raw encoding, the file loading
>completes (with garbage values, of course), so it does not seem to be
>a problem with the format of the NRRD header file I am using.
>
>Unfortunately, this is preventing me from switching from legacy VTK
>readers to the NRRD reader as my conversion example in by
>visualization class being taught this spring.  I like the
>detatched-headers feature of NRRD, which keeps folks from having to
>hand-edit their giant data files, but I do need to be able to have
>them support the reading of ASCII files.
>
>Is implementing ASCII support on the future list?  If so, any idea of
>the timeline?
>
>Thanks,
>Russ
>
>
>---
>Russell M. Taylor II, Ph.D.                           taylorr at cs.unc.edu
>CB #3175, Sitterson Hall                        www.cs.unc.edu/~taylorr
>University of North Carolina,                     Voice: (919) 962-1701
>Chapel Hill, NC 27599-3175                        FAX:   (919) 962-1799
>
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