[Bf-committers] Question regarding Armature System

[Thomas H. Hendrick]

Personally speaking, I have a set of data which uses the X-axis as the 
bone axis, and I think the Z-axis for the up vector.  It was a real pain 
to figure out how to convert the Quaternion Data, and Mesh Data, to 
Blender's scheme.  But I did.  :-)

Just, in-general, though -- I like the idea of this being 
user-selectable.  Could you, perhaps, give me an "off-the-cuff" list of 
what would need to change internally?  At the very least I can stare at 
it until I'm crosseyed.  :-)

--Tom.


Ton Roosendaal wrote:
> Hi,
> 
> The current bone system is hardwired to use the Y axis as Bone axis  
> yes. I've thought of making it an option... but didn't see a real  
> reason for it yet. :)
> The main argument for it would be export/import though, I've heard  
> other packages use other conventions internally. I would need to know a  
> little bit more about that first though. Switching the dominant axis  
> whilst keeping an armature (and its animations!) the same is quite a  
> messy math!
> 
> -Ton-
> 
> 
> On 1 Aug, 2005, at 16:00, Thomas H. Hendrick wrote:
> 
>> Looking at the upcoming changes to the Armature System, they look ...  
>> well ... nothing less than incredible!  :-)
>>
>> I have one question, though.
>>
>> Blender internally seems to have a "hardwired" Bone axis.  That is,  
>> the length of the Bone travels down the Y-axis, and the X-axis (I  
>> think) is the "up" vector.
>>
>> What would be involved in making this user-selectable on a per-model  
>> or per-armature basis?  (Per bone would just be silly I think -- at  
>> least from a user perspective).
>>
>> This is probably something that would just be too much for the  
>> upcoming 2.4 release, given the overhaul coming to the Armature 
>> code.   Any ideas on (1) how tough this might be, and (2) what would 
>> be  involved for something like this to happen?
>>
>> Thanks much!
>> --Tom.
>>
>> --  
>> ----------------------------------------------------------------------- -
>> Tom Hendrick<thomas.hendrick at vistagy.com>                Technical  Staff
>> [W] 1-(781)-290-0506 x252   [M] 1-(617) 448-2585    [H]  1-(978)-244-1149
>> Vistagy, Inc.                                     http://www.vistagy.com/
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> ------------------------------------------------------------------------ --
> Ton Roosendaal  Blender Foundation ton at blender.org  http://www.blender.org
> 


-- 
------------------------------------------------------------------------
Tom Hendrick<thomas.hendrick at vistagy.com>                Technical Staff
[W] 1-(781)-290-0506 x252   [M] 1-(617) 448-2585    [H] 1-(978)-244-1149
Vistagy, Inc.                                    http://www.vistagy.com/
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