Experimental: Meta Compatibility

[rblenkinsopp]

Summary

This adds an experimental feature to the OpenXR provider to adapt data from Meta's OpenXR hand-tracking to better match LeapC positions. This enables Capsule hand to look more natural and fixes rigging issues with hand-models which expect LeapC data.

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[rblenkinsopp]

External feedback from @Dwarph:

I can get capsule hands working, but rigged hands don't seem to be playing ball for me (e.g. Ghost Hands) as in not mapping to the hands whatsoever.

[MaxPalmer-UH]

I'm happy with this, given its experimental state. Hand looks much better, with only a slight oddity at the base of the little finger but that could easily be the mesh/shader.

[MaxPalmer-UH]

One minor fix to the header attribute location but otherwise good,

[MaxPalmer-UH]

@rblenkinsopp do you want to take this out of draft?

[rblenkinsopp]

Do you have a screenshot of the slight oddity you were referring to, if we are 90% there it would be nice to get the last 10% done as well:).

I take it you were unable to reproduce the issue that @Dwarph was seeing?

Either way I will take it out of draft as it's functional and we are just resolving any remaining issues.

[MaxPalmer-UH]

I didn't need to re-rig anything for it to work. The existing mesh worked fine. I'll manually test it on Monday.

This is a video, to be honest it's not that significant - it just looked slightly odd from some angles, like the proximal joint was lower than expected. Probably a symptom of how the outline is rendering.

com.oculus.metacam-20250425-170615-0.mp4

[rblenkinsopp]

Ah yes, I see what you mean. I think we should merge this as-is and we can look to improve on that if required.