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Edit mode represents bone orientation via their head and tail
locations, plus a roll value. This math has a singularity in
the -Y direction, resulting in instability and discontinuity
for bones exactly aligned to the Y axis (the tail flips the
deform bones, so +Y is also bad).
The only reliable way to avoid problems is to un-align the
bones via very small offsets in the Z direction.
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Some files needed to be changed manually.
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For backward compatibility the option technically defaults to
old behavior, but all metarigs are changed to the new mode.
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Add support for 5 bone chains to the limbs.paw rig.
Implement a new limbs.rear_paw rig, which provides a three bone IK
mechanism designed to keep the first and third bones nearly parallel
by default (based on a YouTube video by @Pieriko as suggested by
@icappiello).
Implement a limbs.front_paw rig with automation that aims to
keep the angle between second and third bones mostly stable
by default (has influence option), as suitable for front paws.
The horse and wolf metarigs are updated to use these new rig
types, with the horse rig further overhauled by @icappiello.
Maniphest Tasks: T78463
Differential Revision: https://developer.blender.org/D8496
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All metarigs are updated to use split spine components, as super_spine
is deprecated and won't generate FK controls for backward compatibility.
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Reason for rename is that 'set' is a python builtin data structure.
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