[Bf-committers] Vertex Groups bug?

[Ton Roosendaal]

Hi,

Check the third diagram here:
http://www.blender.org/cms/How_Armatures_work.634.0.html

Vertex groups are stored partially on Mesh, and partially on Object  
level. In a Mesh the deform weights are indexed, and these indices are  
used to look up vertexgroup names in the Object.

I am still unsure why the design was made this complex. Maybe the idea  
was you can reuse the same Mesh model to be deformed by armatures with  
different names.... I think it would have been sufficient to store all  
information on Mesh level.

But storing vertexgroup indexes on Object level? That would make  
editing meshes very complex.

You also would have noticed the buttons for vertex groups are in the F9  
"Edit buttons", where all Mesh options reside. Further you can only  
edit groups in editmode...

-Ton-

On 16 Jun, 2006, at 8:10, Geoffrey Bantle wrote:

> Just a quick (and possibly stupid) question, but how
> exactly are vertex groups supposed to work on mesh
> blocks linked to multiple objects?
>
> I was under the impression that if you have two
> objects,  and each one was linked to the same mesh
> block, they would have independent sets of vertex
> groups. This seems to not work however, as this file
> should illustrate:
>
> http://www.umsl.edu/~gcbq44/vweightsprob.blend
>
> The first object is called 'Obj1' and it has 2 vertex
> groups: 'A' and 'B'.
> The second object is called 'Obj2' and it has 2 vertex
> groups 'C' and 'D'.
>
> Now even though the two objects have differently named
> vertex groups, weight painting group 'A' on Obj1 will
> change the weights of group 'C' on Obj2. Similarly
> weight painting group 'B' on Obj1 will change the
> weights of group 'D' on Obj2.
>
> Is this a bug?
>
> Cheers
> Geoffrey Bantle
>
>
>
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Ton Roosendaal  Blender Foundation ton at blender.org  
http://www.blender.org