[X3D-Public] containerField is should or must ? largeattributes; compression
Joe D Williams
joedwil at earthlink.net
Mon Aug 23 12:29:11 PDT 2010
> What are you guys thinking???
not sure, can you give an example of some x3d code?
what you gave for color and vec is not x3d although a style sheet
transformation will do it.
The container fieldValue is not meant to carry a bunch of attributes,
just to serve when the field of strongly typed attribute values is
"too big" for the parser in use.
The count attribute is added due to collada influence, but the @name
is the same as the attribute name it is replacing and the contained
data is of the same type, as found in the schema/dtd.
Back to Behr example, the 9 is corrected to a 3 and the count can be
ommitted.
>> <IndexedTriangleSet>
>> <fieldValue count="3" name="index">
>> 0 1 2
>> </fieldValue>
>> <Coordinate>
>> <fieldValue count="3" name="point">
>> 0 0 0, 1 0 0, 0 1 0
>> </fieldValue>
>> </Coordinate>
>> <Color>
>> <fieldValue count="3" name="color">
>> 0 0 1, 1 0 0, 0 1 0
>> </fieldValue>
>> </Color>
>> </IndexedTriangleSet>
Again, not the recommended coding practice except where needed due to
processing problems.
Thanks and Best Regards,
Joe
----- Original Message -----
From: "Dave" <dave at realmofconcepts.com>
To: "Johannes Behr" <johannes.behr at igd.fraunhofer.de>; "'x3d public
mailing list'" <x3d-public at web3d.org>
Sent: Monday, August 23, 2010 10:45 AM
Subject: Re: [X3D-Public] containerField is should or must ?
largeattributes; compression
<color type='diffuse' r='b' g='1' b='1' a='0' />
<vec x='0' y='0' z='0 '/>
What are you guys thinking??? Why are you trying to make it even more
bellicose than it already is? Are
you looking at Collada as an example of 'good xml'? It's not. GO look
at
OgreXML.
Even if you wanted to go with this 'fieldValue' thing, why a string of
numbers in wild text?
At some point, a parser needs to read data into some typed variable
(unless it's java or javascript, right?)
And data is ultimately validated at that point. Are you trying to get
pre-parsers (like DTD validation etc)
to do this job for you? Waste of time, unnecessary complication.
XML elements are containers. The parsers will tell you how many things
they contain. No need for counts.
No need for 'container field' or anything like that. If you feel the
need for that stuff, you have done
something wrong in your XML design. Sorry, but I done a lot of it (at
a
basic level), it's just not that
complex. Try applying 'IS-A' and 'HAS-A' paradigms, it really helps.
Dave A
On 8/23/2010 8:30 AM, Johannes Behr wrote:
> On 23 Aug 2010, at 17:06, Joe D Williams wrote:
>
>
>> also, same for color - three points and three colors - in the
>> example. One of the greatest conveniences of X3D is dealing in real
>> verifyable structured strongly typed fields. I still see
>> the<fieldValue> element as a stopgap and emergency measure
>> (instead of just naming the element by the attr data name) but that
>> should not mean we drop strong field typing at any authoring step.
>>
>> Thanks Again and Best Regards,
>> Joe
>>
>>
>>
>>
>>
>> ----- Original Message ----- From: "Joe D
>> Williams"<joedwil at earthlink.net>
>> To: "Johannes Behr"<johannes.behr at igd.fraunhofer.de>; "John A.
>> Stewart"<alex.stewart at crc.ca>
>> Cc: "X3D Graphics public mailing list"<x3d-public at web3d.org>
>> Sent: Monday, August 23, 2010 7:54 AM
>> Subject: Re: [X3D-Public] containerField is should or must ?
>> largeattributes;compression
>>
>>
>> I disagree with count field here
>>
>> <fieldValue count="9" name="point">
>> 0 0 0, 1 0 0, 0 1 0
>> </fieldValue>
>>
>> I think the count should be 3 because point is an MFVec3f.
>> In order to get the validation in the same way as for attrs, then
>> the
>> count if given should match the number of fields expected when trhe
>> data was encoded as an attribute.
>>
> You are right. This was a copy&paste bug.
> This should and must be 3 for correct allocation.
>
> regards
> johannes
>
>
>> Thanks and Best Regards,
>> Joe
>>
>>
>>
>> ----- Original Message ----- From: "Johannes
>> Behr"<johannes.behr at igd.fraunhofer.de>
>> To: "John A. Stewart"<alex.stewart at crc.ca>
>> Cc: "X3D Graphics public mailing list"<x3d-public at web3d.org>
>> Sent: Monday, August 23, 2010 4:08 AM
>> Subject: Re: [X3D-Public] containerField is should or must ?
>> largeattributes; compression
>>
>>
>>
>> On 9 Aug 2010, at 15:18, John A. Stewart wrote:
>>
>>
>>> On 2010-08-09, at 12:49 AM, Braden McDaniel wrote:
>>>
>>>>>
>>>>> so the idea is appealing. has anybody yet:
>>>>> - implemented it in a player, or estimated the work-effort
>>>>> involved?
>>>>>
>>>> I think I recall reading that this is implemented in
>>>> InstantReality.
>>>>
>> Yes it is. The InstantReality loader can handle data encoded in
>> CData-blocks since beta7
>> The count-field is optional:
>>
>> <IndexedTriangleSet>
>> <fieldValue count="3" name="index">
>> 0 1 2
>> </fieldValue>
>> <Coordinate>
>> <fieldValue count="9" name="point">
>> 0 0 0, 1 0 0, 0 1 0
>> </fieldValue>
>> </Coordinate>
>> <Color>
>> <fieldValue count="9" name="color">
>> 0 0 1, 1 0 0, 0 1 0
>> </fieldValue>
>> </Color>
>> </IndexedTriangleSet>
>>
>> regards
>> johannes
>>
>>
>>> It was (is), as well as in FreeWRL, if the X3D header indicates
>>> version 3.3
>>>
>>> -----------------------------------------------------------
>>> John A. Stewart
>>> alex.stewart at crc.ca
>>>
>>> Network Systems and Technologies -
>>> Systemes et technologies des reseaux
>>> Communications Research Centre Canada |
>>> Centre de recherches sur les communications Canada
>>>
>>> 3701 Carling Ave. | 3701, avenue Carling
>>> PO Box 11490, Station H | CP 11490, succursale H
>>> Ottawa ON K2H 8S2 | Ottawa (Ontario) K2H 8S2
>>>
>>> http://www.crc.ca
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>> --
>> Dr. Johannes Behr
>> Leiter Projektbereich VR
>>
>> Fraunhofer-Institut für Graphische Datenverarbeitung IGD
>> Fraunhoferstr. 5 | 64283 Darmstadt | Germany
>> Tel +49 6151 155-510 | Fax +49 6151 155-196
>> johannes.behr at igd.fraunhofer.de | www.igd.fraunhofer.de
>>
>>
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> --------
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> Fraunhoferstr. 5 fax: +49-6151-155-196
> D-64283 Darmstadt skype: johannesbehr
> Germany web: www.igd.fhg.de/www/igd-a4/
>
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