Understanding IK for R6? (Walk cycle)

So for a long time I have been trying to understand IK… for R6. I have seen a lot of topics about R6 IK walking but couldn’t find any solid solutions or answers that actually helped.

Here’s what I want to know:
A simple way to make IK for R6 where I can build out of.
How it works, because I am not here to just copy paste.

I have found one that works, but there is one big problem that is the rotation for when the target point is in front or back it rotates the Y which I can’t understand why exactly and how to prevent or fix that.
https://gyazo.com/90404f060c3dd184f024e08c65106c38

I have no idea how easy or hard it is since no body really discusses about it.
Any help would be useful. Thank you.

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For those of you about to say, “what is IK?” It is inverse kinematics.

Sorry, I can’t help you out as I am not currently at my computer but best of luck!

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Not in a hurry. I just want to find a clear way for inverse kinematics to be done, for everyone.

Hello,

I don’t know anything about it either, but I suggest getting a free model and digesting it, basically find pieces you don’t understand and search them up and figure out how they work.

I think it will help.