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Question by Ikol · Feb 28, 2017 at 09:19 AM · animationanimatormaskavatarbones

Avatar mask affects on unselected bones

Hello there! Have some issue with avatar mask

I have a Generic animation, with this mask: alt text

And I have an Avatar mask: alt text

"Arms_Parent" is unchecked everywhere, because I dont want animate this bone. So I made only one layer in animator, which assigned to this Generic animation. And I assigned Avatar mask to this layer with unselected "Arms_Parent". But "Arms_Parent" still animates

Where could be problem? How can I disable animation for "Arms_Parent"?

Sorry for my English

ss2017-02-28at120241.png (18.3 kB)
ss2017-02-28at120027.png (18.4 kB)
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ShadoX

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Answer by ShadoX · Jan 26, 2021 at 12:06 PM

Had a similar issue, so just posting an answer for those coming across it in the future.

The problem (in my case and probably OP as well) is that the Arms_Parent Bone is a child of other bones (Player_Root > Bones > Body_Rotate > Body) which are enabled in the Avatar Mask. Meaning that anything that affects any of the Parent bones automatically affects Arms_Parent even if it's disabled in the Avatar Mask.

It's rather stupid / unexpected behavior, since you'd expect any bone that's not selected in the Avatar Mask to be ignored in the animations, but unfortunately it doesn't work that way.

The only solutions I could think of:

 1) Uncheck any parent bones (Player_Root > Bones > Body_Rotate > Body), though that might not be always an option depending on which ones are required for your animation... 
 
 2) Have another animation override the Arms_Parent animation. Could be as simple as a single keyframe animation, where the Arms_Parent is just keyed to the position you need it in. Or alternatively just do it as part of another animation, rather than creating a whole new one. You might not even need to create an animation, if the Arms_Parent bone is in the position you need it to as part of another animation. 

Also - the order of the Layers in the Animator seems to be important as any of the layers at the top get overrided by those below it.. at least if I recall correctly.

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