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Just in case the user wants to apply some custom changes to the
generated rig, allow executing a text datablock as a python script
after generation completes.
The script is executed with the generated rig active and in object
mode. When executed by rigify, the generator instance is available
via `rigify.get_generator()`. Outside of Rigify generation the return
value is None.
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Also make error handling more robust and extend constraint relink mixin.
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Add a LazyRigComponent class that has to be explicitly enabled
to start receiving callbacks.
Support calling GeneratorPlugin instance callbacks in the same
stage they were created.
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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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It is not really safe to assume that by swapping ORG to DEF you will
get a deform bone derived from the given ORG bone. The new base rig
API already tracks copying of bones, so polish it up and use here.
Note however that this tracking doesn't work with bones created
without self.copy_bone, e.g. by legacy rigs.
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Add a separate rig aimed at transferring bones from the metarig
completely verbatim without the ORG prefix, and remove the hacky
copy_chain/super_copy option for renaming ORG to DEF. Share the
constraint retargeting feature between super_copy and raw_copy.
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The layer selection for the spine tweaks happens to be the default value,
so simply copying the data does not overwrite non-default garbage values
remaining in some of the bones. To fix it's necessary to clear params.
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Toes behave as FK, but are needed both in IK and FK mode.
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The main goals are to provide an official way for rigs to
interact in a structured way, and to remove mode switching
within rigs.
This involves introducing a base class for rigs that holds
rig-to-rig and rig-to-bone references, converting the main
generator into a class and passing it to rigs, and splitting
the single generate method into multiple passes.
For backward compatibility, old rigs are automatically handled
via a wrapper that translates between old and new API.
In addition, a way to create objects that receive the generate
callbacks that aren't rigs is introduced via the GeneratorPlugin
class. The UI script generation code is converted into a plugin.
Making generic rig 'template' classes that are intended to be
subclassed in specific rigs involves splitting operations done
in each stage into multiple methods that can be overridden
separately. The main callback thus ends up simply calling a
sequence of other methods.
To make such code cleaner it's better to allow registering
those methods as new callbacks that would be automatically
called by the system. This can be done via decorators.
A new metaclass used for all rig and generate plugin classes
builds and validates a table of all decorated methods, and
allows calling them all together with the main callback.
A new way to switch parents for IK bones based on the new
features is introduced, and used in the existing limb rigs.
Reviewers: icappiello campbellbarton
Differential Revision: https://developer.blender.org/D4624
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