[Bf-committers] Re: [Bf-blender-cvs] CVS commit: blender/source/blender/include butspace.h blender/source/blender/src buttons_object.c blender/source/blender/python/api2_2x Constraint.c Constraint.h Blender.c Object.c Pose.c blender/source/blender/python/api2_2x/doc Constraint.py API_intro.py ...

[Ton Roosendaal]

Hi Malefico,

There's a couple of reasons for constraints to be on Object level, and  
not on "Object data" level.

- it allows re-use of an Armature with different constraints set
- constraints themselves allow inter-object relations too

Further it fits with how Blender data was designed in other parts.  
Inside of a Mesh you also cannot create relationships with other  
objects... for example a Hook (as is for any deformation) is on Object  
level too.

The Pose is really just an extension of an Object, providing a mapping  
from an Object to its associated data. I know it's a bit confusing when  
you don't know the code, that's why I wrote this page on 'how armatures  
work'. It's really important for you guys to read that, and just  
contact me if there's anything unclear in it.

http://www.blender.org/cms/How_Armatures_work.634.0.html

-Ton-


On 9 May, 2006, at 3:06, malefico andauer wrote:

> Hi Ken,
>
> We are playing with Constraint module, but the fact
> that is an attribute of poses instead of bones,
> confuses us a little...
>
> We tried the example script in the docs and got error.
>
> Sorry my ignorance, but shouldn't this be more logical
> if we just iterate around the bones in an armature and
> get the constraints each bone has ? Don't really get
> what the poses mean and why this is the way to access
> to constraints...
>
> Can you check the example you posted in the docs and
> explain it or provide some other example ?
>
> The code in the docs is:
>
> ---------
> from Blender import *
>
> ob = Object.Get('Armature')
> for bonename in pose.bones.keys():
>   bone = pose.bones[bonename]
>   for const in bone.constraints:
>     print bone.name,'=>'const.type
> ----------
>
> We changed it to:
>
> ------------
> from Blender import *
>
> pose = Armature.Get('Armature')
> for bonename in pose.bones.keys():
>   bone = pose.bones[bonename]
>   for const in bone.constraints:
>     print bone.name,'=>',const.type
> -------
>
> ...to get rid of some error messages, but we're stuck
> on "
>
> Traceback (most recent call last):
>   File "test_constraint.py", line 6, in ?
>     for const in bone.constraints:
> AttributeError: 'Bone' object has no attribute
> 'constraints'
>
>
>
> Thanks for any help !
>
> malefico
>
>  --- Ken Hughes <khughes at pacific.edu> escribió:
>
>> khughes (Ken Hughes) 2006/05/07 16:57:58 CEST
>>
>>   Modified files:
>>     blender/source/blender/include butspace.h
>>     blender/source/blender/src buttons_object.c
>>     blender/source/blender/python/api2_2x Blender.c
>> Object.c
>>                                           Pose.c
>>     blender/source/blender/python/api2_2x/doc
>> API_intro.py
>>
>> Object.py Pose.py
>>   Added files:
>>     blender/source/blender/python/api2_2x
>> Constraint.c
>>
>> Constraint.h
>>     blender/source/blender/python/api2_2x/doc
>> Constraint.py
>>
>>   Log:
>>   ===Python API===
>>   New Constraint API.  Constraints are accessible
>> through a "constraints"
>>   attribute in poses and objects.  Would be REALLY
>> NICE for armature users to
>>   pound on this code.
>>
>>   Revision  Changes    Path
>>   1.79      +8 -1
>> blender/source/blender/include/butspace.h
>>
>>
> <http://projects.blender.org/viewcvs/viewcvs.cgi/blender/source/ 
> blender/include/butspace.h.diff?r1=1.78&r2=1.79&cvsroot=bf-blender>
>>   1.156     +25 -10
>> blender/source/blender/src/buttons_object.c
>>
>>
> <http://projects.blender.org/viewcvs/viewcvs.cgi/blender/source/ 
> blender/src/buttons_object.c.diff?r1=1.155&r2=1.156&cvsroot=bf- 
> blender>
>>   1.82      +3 -1
>> blender/source/blender/python/api2_2x/Blender.c
>>
>>
> <http://projects.blender.org/viewcvs/viewcvs.cgi/blender/source/ 
> blender/python/api2_2x/Blender.c.diff?r1=1.81&r2=1.82&cvsroot=bf- 
> blender>
>>   1.187     +5 -2
>> blender/source/blender/python/api2_2x/Object.c
>>
>>
> <http://projects.blender.org/viewcvs/viewcvs.cgi/blender/source/ 
> blender/python/api2_2x/Object.c.diff?r1=1.186&r2=1.187&cvsroot=bf- 
> blender>
>>   1.11      +9 -26
>> blender/source/blender/python/api2_2x/Pose.c
>>
>>
> <http://projects.blender.org/viewcvs/viewcvs.cgi/blender/source/ 
> blender/python/api2_2x/Pose.c.diff?r1=1.10&r2=1.11&cvsroot=bf-blender>
>>   1.33      +1 -0
>>
> blender/source/blender/python/api2_2x/doc/API_intro.py
>>
>>
> <http://projects.blender.org/viewcvs/viewcvs.cgi/blender/source/ 
> blender/python/api2_2x/doc/API_intro.py.diff? 
> r1=1.32&r2=1.33&cvsroot=bf-blender>
>>   1.70      +3 -1
>> blender/source/blender/python/api2_2x/doc/Object.py
>>
>>
> <http://projects.blender.org/viewcvs/viewcvs.cgi/blender/source/ 
> blender/python/api2_2x/doc/Object.py.diff?r1=1.69&r2=1.70&cvsroot=bf- 
> blender>
>>   1.4       +3 -0
>> blender/source/blender/python/api2_2x/doc/Pose.py
>>
>>
> <http://projects.blender.org/viewcvs/viewcvs.cgi/blender/source/ 
> blender/python/api2_2x/doc/Pose.py.diff?r1=1.3&r2=1.4&cvsroot=bf- 
> blender>
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------------------------------------------------------------------------ 
--
Ton Roosendaal  Blender Foundation ton at blender.org  
http://www.blender.org