[X3D-Ecosystem] Does this AI program generally look correct?

[Joe D Williams]

> No, in Blender, skin weights are influenced by the entire bone, from head to tail.  

That is OK,just assign those index and weight values found  for a bone to the parent hanim Joint.  (same as bone head). 
The index and weight  values developed for a bone or a combination of bones
are correct when assigned to the correct parent hanim joint.

More Fun with HAnim, 
Joe

-----Original Message-----
From: John Carlson <yottzumm at gmail.com>
Sent: Jan 16, 2025 11:09 PM
To: X3D Ecosystem public discussion <x3d-ecosystem at web3d.org>, Katy Schildmeyer KS APPAREL DESIGN <katy at ksappareldesign.com>, Joe D Williams <joedwil at earthlink.net>, Michalis Kamburelis <michalis.kambi at gmail.com>, Vincent Marchetti <vmarchetti at kshell.com>, Carol McDonald <cemd2 at comcast.net>, GPU Group <gpugroup at gmail.com>
Subject: Re: Does this AI program generally look correct?

I forgot to include this quote:  “No, in Blender, skin weights are influenced by the entire bone, from head to tail. The bone's influence on vertices is generally calculated based on the distance from the vertex to the nearest point on the line segment formed by the bone's head and tail. This is why it's important to set proper bone tail positions, not just the head positions.”
 
So it would seem like the best thing to do for X3D is not use the child joint center for the parent bone tail, except as a direction vector???
 
AI misinformation?
 
Hmm!


On Fri, Jan 17, 2025 at 12:55 AM John Carlson <yottzumm at gmail.com (mailto:yottzumm at gmail.com)> wrote:
Here’s another option:
 
https://claude.site/artifacts/fa241e9b-1755-4ae6-8bcf-ea4841248b9a

What these two seem to indicate is that bone tail should not be child joint center.  What do you think?  Also, since it’s not only the bone head influencing the skin, perhaps we should change the length of the bones I’m loading?
 
I’m puzzled, because I see a difference in how Claude seems to indicate how bone influences the skin than what you guys have been telling me, but perhaps you guys assumed short bone length?
 
John 

On Fri, Jan 17, 2025 at 12:42 AM John Carlson <yottzumm at gmail.com (mailto:yottzumm at gmail.com)> wrote:
If we can agree that this generally looks ok, I will try to implement this in the Blender importer:  https://claude.site/artifacts/7c4c15f2-1bde-4da5-9503-f4f25b09016a
 
I realize the bone.tail should probably be the child joint center.
 
I do not yet know what i am doing wrong, but my focus will be shifting to animation import after export is done to my satisfaction.






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