How do r6 converters work, anyway?

there’s been one thing on my mind lately.

r6 converters. literally r6, but for r15 avatars.

i’m noticing the upper arm’s offset pivot on the Y axis, so rotating it gives us a higher arm placement.
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using IK in the animation editor already makes the editor freak out due to the unusual pivoting.

the lower arm has its pivot in the middle of the entire arm.
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the hand also has pivoting on its top:
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rotating it does nothing.
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now, my question is HOW ON EARTH are they actually doing this? i have no experience with body meshes and stuff like this, so an explanation would be appreciated.

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I’d have to assume this is so you can wear R15-only items on an “r6 avatar” and prevent games from forcing r15, maybe?

They could also be useful on the off-chance that roblox removes r6 entirely (looking likely with the leaked documents and a sudden even all about r6 and classic roblox).

The reason they wont work with animators is that they likely don’t properly have those specific joints on the skeleton.