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

[Moreland, Kenneth]

Just to update this old thread, I added ASCII support to the NRRD reader.
It should be available when 4.0 is released.

-Ken



On 1/4/13 3:18 PM, "Moreland, Kenneth" <kmorel at sandia.gov> wrote:

>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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