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I can't solve this problem in any way (marked "trouble" on gif)

"A" and "C" are separate IK-chains that work well. But, I cannot connect them correctly.

"C.2" bone locked rotation, only location transform. In this example was try to use Limit distance constraint from "B.1" bone to "A.IK-target" bone. And "C.IK-target" bone use Locked track constraint to "B.1" bone.

enter image description here

Update:

This is rig of door. All joints must be connected and must not separate in animation.

enter image description here

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  • $\begingroup$ Share your file. blend-exchange.com Also, give us a clear idea of how you want the desired results to be different from the ones you've already shown. $\endgroup$
    – R-800
    Mar 17, 2021 at 21:01

2 Answers 2

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Problem solved with 3 ik-chains, finished file attached

https://blend-exchange.com/b/8MybezWq

enter image description here

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Taking advantage of the fact that the original bone B.1 is always at a constant angle, it can be aggregated into a single IK system. enter image description here

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