[Fiware-miwi] XML3D (<)-> reX EC mapping doc (Re: Hangout to discuss 3D-UI architecture)

Torsten Spieldenner torsten.spieldenner at dfki.de
Fri Jan 24 09:14:09 CET 2014


Hello,

thank you very much for the mappings. I'll add those to the 3D UI 
Architecture page then and give a notice when I'm done so you can have a 
look.

~Torsten


Am 1/24/2014 8:07 AM, schrieb Toni Alatalo:
> As planned in the meeting yesterday, we'll document the co-use of the 
> XML3D vocabulary (which is somewhat identical with the reX components 
> already) and the reX EC model --- for the integrated use of 3D-UI and 
> Sync.
>
> I started a draft in a gdoc, is also pasted below: 
> https://docs.google.com/document/d/1OgU7hAatSAH3foGZ1ngWCv8xagyOlKkG8C5CQOQwExo/edit
>
> Torsten can perhaps take this forward towards integration to the arch 
> etc docs? IIRC Philipp also said he'll have some chances later today 
> or during the weekend (Christof needs this by Sunday to ship on Monday 
> - can and will of course be improved later but some sort of first 
> version). Feel free to either work on & comment in the gdoc or move to 
> the wiki suitably. I'm busy with other things till noon now but can 
> return to this in the afternoon (and Erno can check this today too).
>
> ~Toni
>
> The scene model to integrate 3DUI & Synchronization
>
> To integrate 3D-UI with network synchronization an abstract scene 
> model is used in the client core. It is implemented as a Javascript 
> library and also provides the JS API for application developers to 
> create and manipulate the scene. It uses the realXtend 
> Entity-Component (reX EC for short) model, which is also used in the 
> network protocol and on the server when implementing networked 
> multi-user applications. The same API is used on the server side for 
> scene manipulations. Here we describe the mapping from the XML3D 
> structure and vocabulary to the realXtend scene model with entities, 
> components and attributes. In this description XML3D is in bolded xml 
> tags (e.g. <mesh>) and the reX EC mapping in Javascript in italic 
> (e.g. entity.mesh).
>
> 1.
>     XML3D <group>elements are reX EC entities: entity
> 2.
>     XML3D elements inside a group, for example <mesh>and <light>, are
>     corresponding reX EC components attached to the entity:
>     entity.mesh, entity.light
> 3.
>     A single XML3D element without an encapsulating <group> is also a
>     reX EC entity with the corresponding component. That is, <mesh>is
>     same as <group><mesh/></group>: entity.mesh.
> 4.
>     XML3D <group transform=matrix>is mapped to the reX EC Placeable
>     component which has the same transform matrix as the transform
>     attribute correspondingly: entity.placeable.transform
> 5.
>     XML3D <view>elements are mapped to corresponding reX EC camera
>     components: entity.camera. The camera for the view is
>     automatically set as the active one (the scene can have multiple
>     cameras simultaneously but only one can be used for one view).
> 6.
>     Hierarchical XML (nested tags) in XML3D is mapped to identical
>     hierarchy of entities in reX EC. (implementation NOTE:
>     hierarchical structure is not implemented in reX EC yet, current
>     implementation of the mapping uses placeable parent reference
>     attributes. This will change in coming releases)
> 7.
>     XML3D element attributes, for example <mesh src=x>, are mapped to
>     the corresponding reX EC attributes: entity.mesh.meshRef.x.
>     Harmonising the attribute names to have them the same everywhere
>     is under consideration.
> 8.
>     XML element attributes unknown to the reX EC scene vocabulary
>     (existing Tundra components) are mapped directly: <myelement
>     myattr=x>is myentity.myattr.x. (implementation NOTE: proper
>     implementation for arbitrary types in the networked system is not
>     yet implemented).
>
>
> The API to create, remove and listen for changes in the scene is 
> documented in the Synchronization GE docs.
>
> -----
> 1) The client core (in WebTundra) uses it also when running in 
> standalone mode for single user applications, without using a server 
> and the Synchronization GE overall.
> 2) This might actually currently require ent.mesh.meshRef.ref (with 
> that additional .ref at the end) due to using an AssetReference type 
> instead of just a string for the ref like in src - let's consider 
> changing that
>
>
> On 23 Jan 2014, at 15:01, Christof Marti <mach at zhaw.ch 
> <mailto:mach at zhaw.ch>> wrote:
>
>> Hi
>>
>> Here is the hangout link for the meeting:
>> https://plus.google.com/hangouts/_/7acpjrv7f2be4bmhtjela651hk?hl=de
>>
>> Cheers Christof
>>
>> Am 23.01.2014 um 09:18 schrieb Marti Christof (mach) <mach at zhaw.ch 
>> <mailto:mach at zhaw.ch>>:
>>
>>> Thanks Toni
>>>
>>> It looks like today 14:00-15:00 is the best option. Would be great 
>>> if Philipp can join then too (Had no feedback so far).
>>>
>>> Best regards
>>> Christof
>>>
>>> Am 22.01.2014 um 17:01 schrieb Toni Alatalo <toni at playsign.net 
>>> <mailto:toni at playsign.net>>:
>>>
>>>> A bit about the agenda: What prompted this to me now was reading 
>>>> our arch doc & 3DUI and Sync GE docs. I find the overall arch doc 
>>>> does an ok job for now for describing the whole, but the GE ones 
>>>> are from different worlds. They are both fine as themselves but 
>>>> don't tell how they should work and be used together (which the 
>>>> arch doc does promise).
>>>>
>>>> The docs in question:
>>>> Overall Arch: 
>>>> https://forge.fi-ware.eu/plugins/mediawiki/wiki/fi-ware-private/index.php/Advanced_Middleware_and_Web_UI_Architecture
>>>> 3DUI GE: 
>>>> https://forge.fi-ware.eu/plugins/mediawiki/wiki/fi-ware-private/index.php/FIWARE.ArchitectureDescription.MiWi.3D-UI
>>>> Sync GE: 
>>>> https://forge.fi-ware.eu/plugins/mediawiki/wiki/fi-ware-private/index.php/FIWARE.ArchitectureDescription.MiWi.Synchronization
>>>>
>>>> The question I think we should answer clearly for app developers 
>>>> is: what is the API one should use to develop an app for the 
>>>> overall arch.
>>>>
>>>> I'll post separate notes about the meet we had last Thu about xml3d 
>>>> support in WebTundra in general & especially how net sync of xml3d 
>>>> data is planned to work there --- have the notes about it on paper 
>>>> now but need to type it, either later this evening or tomorrow 
>>>> before this session. It is a bit a different topic but closely related.
>>>>
>>>> Cheers,
>>>> ~Toni
>>>>
>>>> On 22 Jan 2014, at 14:51, Christof Marti <mach at zhaw.ch 
>>>> <mailto:mach at zhaw.ch>> wrote:
>>>>
>>>>> Hi
>>>>>
>>>>> At the meeting a short hangout dedicated to discuss the common 
>>>>> 3D-UI architecture description was requested.
>>>>> It has to be quite short notice because we also have to update the 
>>>>> page until Friday.
>>>>> I prepared a doodle containing dates for today and tomorrow: 
>>>>> http://www.doodle.com/9gzbu6ggyiit3a6z 
>>>>> <http://www.doodle.com/9gzbu6ggyiit3a6z>
>>>>>
>>>>> Please register your availability asap, if you are involved in the 
>>>>> 3D-UI GE architecture.
>>>>> If no time-slot fits for you please let me know.
>>>>>
>>>>> Christof
>>>>> ----
>>>>> InIT Cloud Computing Lab - ICCLab http://cloudcomp.ch 
>>>>> <http://cloudcomp.ch/>
>>>>> Institut of Applied Information Technology - InIT
>>>>> Zurich University of Applied Sciences - ZHAW
>>>>> School of Engineering
>>>>> Phone: +41 58 934 70 63
>>>>> Skype: christof-marti
>>>>> _______________________________________________
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>>>>> https://lists.fi-ware.eu/listinfo/fiware-miwi
>>>>
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>
>
>
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