[x3d-public] problem in nrrd example file header

[GPU Group]

I must have just been lucky the way I implemented, I don't have a problem
reading the .nrrds mentioned.
-Doug
https://sourceforge.net/p/freewrl/git/ci/master/tree/freex3d/src/lib/opengl/LoadTextures.c
L.1048 start of .nrrd
L.1146 a comment about degenerate first dimension - is that the same thing?


On Tue, Feb 13, 2018 at 8:28 AM, Don Brutzman <brutzman at nps.edu> wrote:

> Hi Nicholas... am following up on this lingering item from the holiday
> break.
>
> Can you please confirm the correction by Andreas, and advise on how we are
> handling the files?
>
> I don't mind hosting at savage.nps.edu but often there are difficulties
> with server certificates and cross-origin resource sharing (CORS).  Thus it
> would be good to figure out how best to handle this large Web3D dataset.
>
> If the "right answer" isn't immediately clear, perhaps a short session in
> one of the regular teleconferences might be appropriate sometime, then we
> can figure it out together.
>
> TIA.
>
> On 1/2/2018 12:30 AM, Don Brutzman wrote:
>
>> Thanks for further checking Andreas.
>>
>> Nicholas (cc:ed) is originator of these files.  Have also copied Medical
>> working group since these are relevant examples.
>>
>> I will be happy to post updates to these files but am hoping that we all
>> proceed consistently to avoid versionitis later.  Further most are large
>> (indeed overwhelming usual .zip distributions) so it is good to get them
>> all sorted out correctly together.
>>
>> v/r Don
>>
>> On 1/1/2018 5:32 PM, Andreas Plesch wrote:
>>
>>> It turns out that
>>>
>>> http://savage.nps.edu/Savage/VolumeRendering/datasets/nrrd/m
>>> ri_ventricles_segment.nrrd
>>>
>>> has the same problem of a malformed header line, eg. an excess space
>>> character in the spacings line.
>>>
>>> Here is a corrected nrrd file:
>>>
>>> https://cdn.glitch.com/405924cd-3c0d-476e-9b88-520a5610604c%
>>> 2Fmri_ventricles_segment_fixed.nrrd?1514854259949
>>>
>>> -Andreas
>>>
>>> On Mon, Dec 18, 2017 at 4:18 PM, Andreas Plesch <andreasplesch at gmail.com>
>>> wrote:
>>>
>>>> I am working on ImageTexture3D support for x3dom using the existing
>>>> ImageTextureAtlas node and https://github.com/scijs/nrrd-js as a
>>>> parser.
>>>>
>>>> It turns out the the parser is very strict, and so discovered a
>>>> malformed header line in
>>>> https://savage.nps.edu/Savage/VolumeRendering/datasets/nrrd/
>>>> mri_ventricles.nrrd
>>>> used in http://www.web3d.org/x3d/content/examples/Basic/VolumeRender
>>>> ing/BasicVentriclesIndex.html
>>>>
>>>> Specifically, the header line
>>>> 'spacings:  NaN 0.009 0.009 0.009'
>>>>
>>>> has _two_ space character after the colon delimiter. Exactly _one_
>>>> space is allowed, however, as described here:
>>>>
>>>> http://teem.sourceforge.net/nrrd/format.html#general.2
>>>> second paragraph:
>>>> ... a string "<field>" identifying the field (called the field
>>>> identifier), then a colon followed by a single space ": ", and then
>>>> the information describing the field "<desc>" (called the field
>>>> descriptor) ...
>>>>
>>>> The second space then acts as a separator making the first value in
>>>> the array an empty string which causes throwing when attempting to
>>>> parse as a float.
>>>>
>>>> I made an attempt at fixing the header by removing one space and made
>>>> the file available here:
>>>>
>>>> https://cdn.glitch.com/af228b45-6772-432d-a549-74f9f447b2c3%
>>>> 2Fmri_ventricles2.nrrd?1513631507711
>>>>
>>>> -Andreas
>>>>
>>>> --
>>>> Andreas Plesch
>>>> Waltham, MA 02453
>>>>
>>>
> all the best, Don
> --
> Don Brutzman  Naval Postgraduate School, Code USW/Br
> brutzman at nps.edu
> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
> +1.831.656.2149
> X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzma
> n
>
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