How to find out primary and secondary axis for Basic IK?

Development Programming & Scripting Blueprint
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1

Hello. I’m trying to set up basic IK for my character and I can’t find out which numbers should I use for primary and secondary axis in Basic IK.

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I suppose it should look like that:
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but it still looks awful:
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Could be the problem in additional bones between Bone A and Bone B in Basic IK?
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Or I just don’t understand how to set these axis correctly?

2

Hard to tell from your picture but looks like negitive y. If your confused set secondary to all zeros then try each primary till it works ;). But it should be the vector pointing down the bone (toward the effector)