This is a new converter named IK Angle, designed to facilitate simple inverse kinematics (IK) setups
.cpp and .h file:
converter IK angle.zip (3.5 KB)
demo:
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Wow! It looks cool! 
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Age-restricted video (requested by uploader)
Exciting video indeed but I think that the age-restriction is a bit too much 
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hehehe wrong setting 
But it still has the restriction XD
Incredible work! Haven’t seen a custom converter before.
Which Synfig Studio directory should I drop these files? Looking forward to play around with this for myself.
Why in the video did you convert the bone origins to Add valuenode?
Besides, I believe the l1 and l2 can be automatically inferred.
Yes, I once tried to make L1 and L2 automatic using the bone valuenode, but it caused a crash. Maybe it’s not possible to fetch data from itself.
As for why I used ‘add’, it’s because if I use the parent on the bone pole part, it no longer looks correct. The origin is already influenced by the parent bone.
Maybe it can be improved further. The problem is, I don’t know the core of Synfig. I can only go as far as that. Maybe you or someone else can improve that converter.