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For some reason I'm trying to create a skeleton for a model with an arm made of 5 bones with Rigify, but Rigify is throwing an error message that there can't be more than 3 bones for an arm. 2 bones are supposed to behave like a normal bone, as if there is no joint between them, i.e. 2 bones + 2 bones + 1 bone. is there a way to convert this to Rigify without reducing the bone count?

custom arm

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The reason is, Rigify works using premade modules it can recognize and generate a rig from. You can customize the modules with whatever options given by Rigify, but you can't make up your modules (not without programming them into Rigify).

Rigify — Blender Manual

If your goal is to have each section of an arm to be made out of two deform bones, know that this is already the case by default:

If you select the top-level bone of a chain in Pose Mode, you can see the Rigify Type and its settings. By selecting one of the upper_arm, you can see that it is preset to generate two "segments" :

preset

The resulting rig will have two bones in the arm and forearm:

generated rig

You can find many other options as such, as well as different Rigify Types that might better suit your needs.

Limbs - limbs.arm — Blender Manual

If you want to do something for which Rigify doesn't provide a module, I.E. an arm with two elbows, you can't do it out of the box. You would need to learn some Python and add your own modules to Rigify programmatically.

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  • $\begingroup$ thanks for your comment. Is it possible to assign X and Z rotation to one of these two bones (segments) and Y rotation to the other? so my goal is to make different weight paint for "XZ" and "Y" rotations. $\endgroup$
    – gfytrbbbaa
    Mar 26, 2023 at 2:50

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