Milla Michinaga wrote:
I've checked that they eye-joints don't have any influence in the skinning
With that sentence, it sounds like you're thinking about the problem backwards. The eye bones exuding influence on the skirt wouldn't cause any problems with the eye geometry. It would just cause part or all of the skirt to move in response to the eyes instead of the legs. The right questions are what bones have influence on the eye geometry, and what are those bones doing.
If your avatar is wearing attached eyes, then my guess is one or more bones besides just the eye bones has influence on the attached geometry. If that's the case, you can find the problem pretty easily, via the component editor in Maya. Select all the vertices for the eye attachments, and look at what bones have influence on them. You should see all 1's next to the eye bones, and all zeros for everything else. If anything besides the eye bones has greater than zero infleence, just go in and zero it out.
If it's just the avatar's own built-in eyes, no attachments, then wrong bone influences can't be can't be the issue. It's not possible to change the influences on the built-in avatar geometry at all. Are you using joint positions? If so, that could be your culprit. If you inadvertently moved the eye bones when you rigged that skirt, then the avatar's eyes would of course move to match. If that's the case, then you'll need to redo the rig, with the eye bones in the right places. That should only take a few minutes, since you can just copy the weights from the existing rig to the new one.
If none of the above are the problem, and if it's not simply a viewer hiccup as Cathy suggested, then I'd say something maybe got borked in your COLLADA export, and/or the upload process. Try exporting a new copy, upload that, and see if it doesn't solve the problem.
"It's a big universe. Everything happens somewhere."
- The Doctor
