Layered blend per bone - blend only rotation?

[MJohnsonTKG]

I have a vehicle and I want to control the rotation of the wheels using control rig (to give me more control over their speed), whereas the body of the vehicle is animated using a sequence. So I’m using the output from the animation sequence of the vehicle animation as the base pose into layered blend per bone and then using the control rig pose as the blend pose with branch filters (currently, will probably change this to a blend mask) to isolate the wheels. This works, in that I can now rotate the wheels using control rig, but the problem is they then become “disconnected” from their axle as the control rig is also controlling the position of the wheels.

So my question: Is there are way to only blend the rotations and not the translations of the bones coming from control rig?

Cheers

[Leomerya12]

This may get you close to what you are looking for:

Use only Translation / Rotation of a bone from animation

I found a way to do what I was trying. To remove the rotation from the previous cache you need to add a Transform (Modify) Bone that replaces rotation. The alpha will help blend in and out. To fix its rotation afterwards you need a way to modify it to match the rotation of the gun socket (if parented to the bone). In my case the gun socket is parented to the ik_hand_gun so I used a relative transform. Now, when I walk and alpha = 1, the rotation of the walk animation will not be used. Hope this …