[Bf-committers] what to do with roll for bones?

[P. Visser]

Ok thanks.

I encountered a different problem:

In Collada you have joints instead of bones. So in Collada It is also
possible to translate a joint over time in Collada.

In Blender this is not possible, because in pose mode, you cannot translate
the head and tail of a bone. You can only scale this bone, but that has not
the desired effect...

Any ideas?

> -----Oorspronkelijk bericht-----
> Van: bf-committers-bounces at projects.blender.org [mailto:bf-committers-
> bounces at projects.blender.org] Namens Ton Roosendaal
> Verzonden: zaterdag 26 augustus 2006 15:04
> Aan: bf-blender developers
> Onderwerp: Re: [Bf-committers] what to do with roll for bones?
> 
> Hi,
> 
> This roll is needed to be able to define the full rotation, since it is
> based on a vector (direction).
> 
> Check the diagram here:
> http://www.blender.org/cms/How_Armatures_work.634.0.html
> 
> In Armature EditMode everything is handled non-hierarchical, so when
> you change a roll the children won't be affected. That's useful for a
> precise editing of the rest position.
> 
> For im/exporting of data, it is not very useful to use Armature
> EditMode as a reference, the conversion from /to this mode is very
> nasty.
> 
> -Ton-
> 
> 
> On 25 Aug, 2006, at 23:45, P. Visser wrote:
> 
> > Hi,
> >
> > When I try to import an armature into Blender (from Collada) I get the
> > local-to-world transformations for each Joint.
> >
> > Now, I can easily get the world-locations for the head and tail for
> > each
> > bone. However, I don't understand what the purpose of the roll
> > property is.
> > I see that when I change this value in Blender, The local Axis of that
> > Bone
> > changes but as far as I can see, it has no impact on the childs of
> > that bone
> > whatsoever.
> >
> > - Pieter
> >
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> >
> >
> >
> ------------------------------------------------------------------------
> --
> Ton Roosendaal  Blender Foundation ton at blender.org
> http://www.blender.org
> 
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