doubts with Spine IK

[zack redfiel]

I like the spine and hips to be separate when they move and rotate, but is there a way for the spine to follow when I move the hips only in the "Z" axis? because is not there way to remove the stretch

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[Vincent Burmeister]

I would say the stretching is expected behaviour for a spine ik. To avoid stretching simply select both hip and chest controller and move them in the disired direction. I’m sorry if I misunderstood your problem. I have to say I’m superhappy with the new spine IK and it will save me hours of work. This is something I was whishing for a looong time.

[Alessandro Padovani]

Of course that will not work for pose presets, so if your goal is to export back to daz then keep the option disabled.

[zack redfiel]

Yes, I understand what you mean. but I wonder if it is possible to do manually with restriction and these things, move the hips and the Ik spine follow the hips, but when I move the Ik spine this does not lose its IK behavior.

[Alessandro Padovani]

update.

@Thomas Larsson It seems quite easy to achieve the feature requested by Zack with a simple copy location. But I don't know if this comes in the way with your design. The spine can stretch as before if we move the ik_back control, but will follow if we move the hip.

Eventually @zack redfiel you can add the constraint yourself, it shouldn’t harm.

note. Or we can copy Y alone to only follow the hip for “up down“ movements. This can also be animated on/off with the influence property as usual.

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[zack redfiel]

Yeah that's what I was talking about, I was testing around a little bit and if you just select the Y axis, deselect X and Z, you get interesting results. thanks Alessandro

[Thomas Larsson]

I’n not sure this is a good idea. The idea with spine ik is that you can perfect the pose for the upper body, and then move the hip without ruining it. If the ik back copies the hip location, it will move if you move the hip, which is the complete opposite. If you want to stretch the spine and make it follow the hip, disable spine ik and move the fk back bone.

[Thomas Larsson]

The neck ik option was removed in the last commit. I introduced it because it could use the same code as spine ik, but spine ik makes sense to keep the upper body fixed. Keeping the skull in a fixed position doesn’t make much to me.

[Alessandro Padovani]

ok, Zack can add the constraint himself if needed.