[Bf-committers] Collada status

Rodrigo Hernandez kwizatz at aeongames.com
Sun Aug 3 21:04:47 CEST 2008


Hi Tom,

I think adding a C/C++ API for plugins while keeping Python as an 
alternative would really do a lot of good for situations like these.

The Windows Mingw COLLADA_DOM Dll release build is 4.71MB stripped of 
debugging info, 1.459MB compressed, not exactly small.

As I said before, I have already done work on the import side using 
COLLADA_DOM, I'd take ownership, but I just don't have the time, I can 
help though, and if there is interest, I can make available a binary of 
my plugin for testing purposes.

Cheers!

Tom M wrote:
> Hi Tim,
>
> Collada_Dom is 'MIT' licensed
>
> http://collada-dom.svn.sourceforge.net/viewvc/collada-dom/trunk/dom/license.txt?view=log
>
> which is GPL compatible,
>
> http://www.gnu.org/philosophy/license-list.html
>
> so we are okay as regards the legalities.
>
> The reason the majority of our import/export scripts are written in
> python is that python is 'easier' to do them in, and easier to
> maintain if the original developer disappears (which happens pretty
> often).  That said, I personally wouldn't object to using Collada/DOM.
>  Anyone know roughly how much it would add to our (zipped) binary size
> to include Collada DOM?
>
> Python bindings for a well defined API are pretty easy to do (I think
> there are automagic bindings generators that work well).  However they
> probably aren't necessary.
>
> LetterRip
>
>   
>> And assuming we would go for Python, how difficult would it be to
>> create the bindings ourselfs?
>>
>> Now: I would be inclined to take this on me, but you may understand I
>> need lots of help on the Blender API side.
>> Also, got a 'normal' daytime job, so things will take time.
>>
>> IRC meeting: anytime... I'm in The Netherlands.
>>
>> Tim
>>
>> 2008/8/3 Rodrigo Hernandez <kwizatz at aeongames.com>:
>>     
>>> Hi Ton,
>>>
>>> The problem I found with the current Illusoft scripts is that they are
>>> parse the COLLADA "manually", meaning they access the file as pure XML
>>> through expat, which makes updating to later specification versions and
>>> adding functionality very tedious and time consuming.
>>>
>>> If you want to keep the functionality as scripts I would suggest at
>>> least getting a hold of some implementation of COLLADA_DOM or FCOLLADA
>>> Python bindings/extensions (which sadly don't seem to be available), and
>>> migrate the current parsing code to that.
>>>
>>> Regards,
>>> Rodrigo Hernandez.
>>>
>>> Ton Roosendaal wrote:
>>>       
>>>> Hi Collada devs!
>>>>
>>>> There's a wealth of attention for this part in Blender, and that's very
>>>> welcome. In the past months we had to disappoint many (professional)
>>>> users with the message "sorry, it is not maintained well now".
>>>>
>>>> Here's some info:
>>>>
>>>> - the sourceforge project below has halted.
>>>>    http://sourceforge.net/projects/colladablender/
>>>>
>>>> - that code is in our own svn, in:
>>>>    blender/release/scripts/collada*.py
>>>>
>>>> Actions:
>>>>
>>>> - could people provide patches against our svn py scripts?
>>>>
>>>> - is here anyone interested in accepting 'ownership' for collada (Tim
>>>> seems to qualify well, since he's got a job doing it apparently :)
>>>>
>>>> - we can also arrange an irc meeting together about this... dunno about
>>>> you guys timezones?
>>>>    Optimal would be to make it topic on our standard irc meetings, 4-6
>>>> PM Netherlands time.
>>>>
>>>> -Ton-
>>>>
>>>>
>>>> On 3 Aug, 2008, at 0:03, Dalai Felinto wrote:
>>>>
>>>>
>>>>         
>>>>> Hi,
>>>>>
>>>>> recently I used Blender Collada exporter to generate content for flash
>>>>> 3D.
>>>>> The script looks fine, the only problem is that the final file looks
>>>>> bigger then the necessary.
>>>>> (I tried to import some collada samples and export it and the final
>>>>> file Blender-generated was much bigger.
>>>>>
>>>>> Anyways, if you need some help for testing, please let me know.
>>>>>
>>>>> My test result is here (take a little time to load the texture ...):
>>>>> http://www.ecopath.org/nonewe/3DModelsDemo/3D_shark.swf
>>>>>
>>>>> Regards,
>>>>>
>>>>> Dalai Felinto
>>>>> http://blenderecia.orgfree.com
>>>>>
>>>>> 2008/8/2 Rodrigo Hernandez <kwizatz at aeongames.com>:
>>>>>
>>>>>           
>>>>>> Hi, I started working on a Collada importer/exporter of my own a while
>>>>>> ago, it is really a Python extension that uses COLLADA_DOM, although
>>>>>> it
>>>>>> doesn't cover the full range of Collada possibilities (no export code
>>>>>> at
>>>>>> all yet), it does handle geometries and skins (what I really needed
>>>>>> was
>>>>>> a way to import characters) and materials to an extent, I am working
>>>>>> on
>>>>>> deciphering animation :).
>>>>>>
>>>>>> If there is interest the code can later be integrated into Blender, or
>>>>>> kept as is (though it really just uses Python as glue code, why is
>>>>>> there
>>>>>> no binary API?).
>>>>>>
>>>>>> Anyway, all this is to say that if you're planning to start a new
>>>>>> Blender COLLADA project, you may want to help out with the code base I
>>>>>> already have so you don't reinvent the wheel, and the project moves
>>>>>> forward faster.
>>>>>>
>>>>>> The code I am currently hosting on my private server at
>>>>>> http://svn.aeongames.com/svn/BlenderCollada/trunk/ , but its open
>>>>>> source, there is no license yet, but will probably be MIT or BSD, if
>>>>>> needed be, I would move it to google code or sourceforge, but since I
>>>>>> am
>>>>>> the only one working on it, I just decided to keep it there while
>>>>>> still
>>>>>> a work in progress.
>>>>>>
>>>>>> Feel free to contact me for any questions you may have.
>>>>>>
>>>>>> Regards,
>>>>>> Rodrigo Hernandez.
>>>>>>
>>>>>> Tim Knip wrote:
>>>>>>
>>>>>>             
>>>>>>> Hi list,
>>>>>>>
>>>>>>> This is my first post here.
>>>>>>>
>>>>>>> The reason I joined, is that I need 'good' Collada export and willing
>>>>>>> to work on this.
>>>>>>> I'm doing the Collada stuff - http://ascollada.org/?tag=collada - for
>>>>>>> Papervision3D - http://blog.papervision3d.org/ - a 3D implementation
>>>>>>> for Adobe Flash.
>>>>>>>
>>>>>>> So I've got some understanding of the Collada spec.
>>>>>>> My knowledge on Blender etc. is near zero, though I can handle
>>>>>>> Python a bit.
>>>>>>>
>>>>>>> I understand that Collada import/export is still handled by
>>>>>>> http://sourceforge.net/projects/colladablender/ ?
>>>>>>> Maybe I should simply join this one?
>>>>>>>
>>>>>>> Anyway: just wanted to ask you how/if I should proceed and whether
>>>>>>> there are already plans for Collada?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Tim
>>>>>>> _______________________________________________
>>>>>>> Bf-committers mailing list
>>>>>>> Bf-committers at blender.org
>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>               
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>>>>>>
>>>>>>             
>>>>> _______________________________________________
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>>>>>
>>>>>           
>>>> ------------------------------------------------------------------------
>>>> --
>>>> Ton Roosendaal  Blender Foundation ton at blender.org
>>>> http://www.blender.org
>>>>
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