[x3d-public] HAnim and glTF skins

[Leonard Daly]

Andreas,

I have read all of the messages with this subject. I am responding to 
the first one because I think that is best where my question arises.

Are you working on an understanding and implementation of H-Anim skinned 
animation in X3D or the more general animation of skinned surfaces that 
is done in Maya/Blender/+ in most every other application/use?

If you are doing the more general case would it make more sense to get a 
good understanding of the process and work-flow that is used in those 
applications and practices?

If the intent is to use H-Anim with X3D, you will need to resolve the 
differences between X3D V3.3/H-Anim V1.0 and X3D V4 (not yet in 
existence)/H-Anim V2.0 (perhaps); as you have noted in one of the other 
messages in this chain.


Leonard Daly


> I am collecting information on these skinning systems here:
>
> https://github.com/andreasplesch/x3dom/wiki/HAnim-and-glTF-skins
>
> [This is a editable wiki if anybody wants to add to it]
>
> It looks like the less well known
>
> jointBindingPositions/Rotations/Scales and skinBindingCoords/Normals
>
> fields used for non-humanoid skeletons may be useful but I am not
> certain how to interprete those fields. Castle may not implement those
> as a search did not find a match ?
>
> My understanding is that the transformation matrix defined by these
> fields needs to applied before joint trafos are applied. But to which
> vertices ? The ones listed in skinBindingCoords for sure (if they are
> indexed by skinIndex field in the joint) but how does
> skinBindingCoords and skinCoords field interact ? Does the
> skinBindingCoords field take precedence ? But why then have both
> fields in the first place ?
>
> Could the jointBinding fields equivalently be replaced by a sub-Joint
> node under the joint the fields map to ?
>
> Is there an example using these fields ?
>
> Thanks,
>
> -Andreas
>
>
>
>

-- 
*Leonard Daly*
3D Systems & Cloud Consultant
LA ACM SIGGRAPH Past Chair
President, Daly Realism - /Creating the Future/
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