Problem with reverse foot

[amplionus]

Good day Dear Community!

I have an problem, and I can't solve it 😞

I made a reverse foot sistem for the leg. The sistem is comparatively simple.For my example I will describe only IK sistem (because even if I use triple chain - IK, FK and result joints, I have problems only with IK).

IK leg has Thigh_JNT, Shin_JNT, Ankle_JNT, Ball_JNT and ToeEnd_JNT. Thigh_JNT and Ankle_JNT are connected with rotate-plane IK handle. Ankle_JNT and Ball_JNT connected by single chain-solver IK Handle. Ball_JNT and ToeEnd_JNT too.

After it I made reverse foot sistem. I made it by using locators. I will attach screenshot with this sistem.

The left foot works perfect.

But after I mirrored the right foot it works strange in the area of Ankle.

When I rotate revrese foot side to side, it behaviour strange (see scrinshot).

I really do not know what is happen! I have this problem twise. I tried to completely reorient right joints, but it was usless.

[shannonbuss55]

I am having a very similar problem and have been stuck on it for days. Did you ever find a solution to this problem? 

[Kahylan]

Hi!

It's a bit hard to tell. Since there is no File attached and no video where the problem can be seen in motion. But from what I can see in the original post. The handle between the Ankle_JNT and the Ball_JNT is not working correctly. Now this problem could have multiple reasons. When mirroring over, the IK handels and Effectors loose their history, which basically means, that the IK setup needs to be done again.

Now the problem here could either be that the IK Handle between Ankle and Ball is still the same from the mirroring and therefore are just two meaningless nulls that are not connected to the IKSolver. Or it could be that when he recreated the IK setup, that he accindentally used an RP-Solver for the Ankle-Ball connection instead of an SC-Solver, which would also give that behaviour because the RP-Solver aims at a Vector in worldSpace if not given an aim object with a poleVector Constraint, and is not affected by hierarchy when it comes tho its main axis rotation.

If this isn't the problem, feel free to give me a link to your scene and I'll take a look at it.

Hope this helps!

[R1F]

Hi @amplionus,

I have two suggestions.  Maybe you can see if it helps?

I don't know your exact issue from your photos, but from what it looks like the controllers are out of place after you mirrored the joints.

First suggestion: See video @7.45.  It shows how a joint can be mirrored by using a "group" and freezing the negative  transformations: https://www.youtube.com/watch?v=eqJn229nj2I&t=52s

Maybe try mirroring joints again in this way?

Second suggestion: See attachment "Mirror Joint Options".  There is a difference between mirroring the "behavior function" and the ""orientation function".  Did you select the correct one?  The difference is explained here:

https://knowledge.autodesk.com/support/maya-lt/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/MayaL...

Hope that solved it 🙂

R1F

[R1F · Accepted solution]

@shannonbuss55