[x3d-public] illegal characters in X3D Architecture Table 41.5

[vmarchetti at kshell.com]

Examining the source code for the 3.3 standard, it is apparent that the original character intended for Table 14.5 of the Volume component is the the left arrow,
for which several representations are given at https://www.toptal.com/designers/htmlarrows/arrows/left-arrow/

It is unicode code point 0x2190

Vince Marchetti



> On Sep 8, 2021, at 11:56 AM, vmarchetti at kshell.com wrote:
> 
> John
> 
> Good call on the git logs, but it's even simpler than that.
> If you look at our published spec at https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/volume.html <https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/volume.html>
> we can see that the intended symbol is a left-pointing-arrow. In the near future I will look at the source
> to see what got corrupted.
> 
> Vince Marchetti
> 
> 
> 
>> On Sep 8, 2021, at 10:28 AM, John Carlson <yottzumm at gmail.com <mailto:yottzumm at gmail.com>> wrote:
>> 
>> 1) Would it be possible to go back in the git logs?
>> 
>> 2) if the first 8-bits were 0xFF, what would the UTF-8 be?  Assuming some random bit flip.
>> 
>> On Wed, Sep 8, 2021 at 5:43 AM vmarchetti at kshell.com <mailto:vmarchetti at kshell.com> <vmarchetti at kshell.com <mailto:vmarchetti at kshell.com>> wrote:
>> I examined   file X3D/ISO-IEC19775/ISO-IEC19775-1/ISO-IEC19775-1v4.0/ISO-IEC19775-1v4-CD1/Part01/components/volume.html from github.
>> The xml header line declares the encoding of utf-8, as does the html meta tag, charset field
>> 
>> Line 904 is the first data row of table 41.5
>> <td>S ???? luminance (L)</td>
>> where ???? denotes the garbled bytes.
>> 
>> Examining a hex dump, the 4 bytes between the space following 'S' and the space preceding 'l' are:
>> 0xEF 0xBF 0xBD 0x3F
>> 
>> 0xEF is a byte used in byte-order-marks in different encodings, but it is incorrect to have it in the middle of a file.
>> I have tried without success to decode these 4 bytes and portions of this byte-list in utf-8 and utf-16 ; the only success is that
>> the final byte, 3F, is the question mark in ascii.
>> 
>> I propose the way forward is to decide what character we want to put in these table rows , and a dash would be fine, and make the edit.
>> 
>> Vince Marchetti
>> 
>> 
>> 
>>> On Sep 7, 2021, at 10:07 PM, Brutzman, Donald (Don) (CIV) <brutzman at nps.edu <mailto:brutzman at nps.edu>> wrote:
>>> 
>>> For Mantis 899, hoping someone can discern correct values for garbled characters in
>>>  
>>> https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/volume.html#t-transferFunctionTextureCoordinateMapping <https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/volume.html#t-transferFunctionTextureCoordinateMapping>
>>> Table 41.5 — Transfer function mapping from texture type to texture coordinate
>>>  
>>> Am thinking they might be quite simple, mdash or hyphen perhaps…
>>>  
>>> all the best, Don
>>> -- 
>>> Don Brutzman  Naval Postgraduate School, Code USW/Br       brutzman at nps.edu <mailto: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/brutzman <http://faculty.nps.edu/brutzman>
>>>  
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