When a limit is put on the spine bend in the unity rig muscle settings, rotating your hip causes the head to move down and get desynced from the actual head position.
ModernBalloonie
This is a bit of a specific case, but I have some avatars that I actually don't want the spine to bend on. My problem comes when I limit the spine rotation in Unity in the avatar config, my hip is always rotating with my tracker, However on certain avatars I don't want that to be the case due to their body shape.
When I limit the spine rotation, the head desyncs from my real head in Lock Head, Lock hip and lock both mode and the entire spine bends downwards because the hip tracker rotation is always forced to rotate the hip no matter what.
I feel like if there's a rotation limit on the avatar rig settings, it should possibly keep your head in place and make the spine not rotate on the up/down axis, and decoupling your hip tracker rotation in this case so your spine stays straight, I know it's not really physically accurate but it can be a stylistic choice for avatars with strange body shapes.
Attached below are the rig muscle settings in Unity combined with how it looks like in-game. I'm doing the exact same pose here IRL in both screenshots. I wonder if this could be a setting or something?
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ModernBalloonie
Doing further investigation on this issue, I've discovered that the rig muscle settings for the spine and hip have no effect if the values for them aren't 0. This might indicate another problem.
ModernBalloonie
I feel like this could be helped with the implementation of this: https://feedback.vrchat.com/vrchat-ik-20/p/provide-in-depth-ik-configuration-options-for-enthusiasts as well.