Hi Dr. Sassi,

I was wondering why the character definition tag was finding so many bones, thank you for the detailed analysis. I'll go ahead and go through the latter part of Sam's video and watch his process. I don't have any reason to stay with the character definition tag on the character object, so I'll change that. I assume that if the elbow and hand joints of the current rig are misaligned to the incoming mocap rig, then I'll need to adjust the position of those joints. Would I just do that in the adjust tab of the character object? I guess I'm at the stage of figuring out how to adjust certain scales of my existing rig that the mesh is already painted to, before mapping the mocap over with the character definition & solver tags.

Thank you for your time

quick update- I think the issue is with the scaling differences between the two rigs. The problem areas (arms and fingers) are occurring at the areas of my character rig that have slightly larger scale than the rokoko mocap mixamo rig. Specifically the clavical, biceps, forearms, and hands on my character rig are longer than the mixamo mocap rig which I think is the cause of the issue. Mentioning this just to provide more context to my previous post

Hi Dr. Sassi,

Thanks for the quick reply. And I have seen that video, but I'll review it once more to see if there's anything I can get a refresher on. I think I initially rigged the character in an A pose but oriented it to a t pose (and updated the bind pose) before applying the character definition tag and solver.

One detail that could be important is that the mixamo rig I set up for the character is larger than the rig of the recorded mocap... which may be causing the discrepancies in finger joint rotation. I tried to scale it to about the same size before applying the character solver, but that didn't seem to remedy the issue. If possible, I'd like to see if I can get the finger animation to map properly by adjusting the rig (or bind settings) as opposed to recreating the rig entirely and weight painting again. Thank you for the good wishes and I'll take a look at the video you posted again in the mean time.

Hi there,

I'm currently testing out retargeting rokoko mocap animation via the character definition & solver tag onto a mixamo control rig. I'm getting issues with the fingers and arm joints being rotated in different ways than the mocap rig (pictured). I was wondering if this was some error in the mixamo rig I made (regarding the axis/orientation of the joints) or if this outcome is normal for mocap retargeting (and simply needs to be hand cleaned-up)? Any info would be appreciated

wetransfer project link: https://we.tl/t-GbQo2XBmtQ

Hi Dr. Sassi,

I appreciate that. I'll get it sorted, thanks for your insight and assistance with this matter

have a good rest of your week

Hi Dr. Sassi,

Yes that makes sense. What I was thinking of doing was keeping the clavicle and shoulder joints of the standard mixamo rig and just inserting the above joints in between them. I could keep the mocap data going to the respective joints (mocap is being recorded to mixamo skeletons already) and then potentially just constrain/adjust the inserted joints based on the degrees of rotation of the clavicle & shoulder joints? Not sure if that makes sense but I'd like to keep this shoulder mechanism if possible, even if I am just simulating it's responsiveness to movement.

If not then I'm thinking I may just do away with these meshes and make a simpler single mesh to replace all of these smaller convoluted parts

Thank you

Hi Dr. Sassi,

Apologies for the late response- I set up the shoulder connector in an empty scene (pictured) and created joints to move everything how it ought to move. I think this should work as far as the rotations of the mesh objects go- however I have a further question: if I were to integrate this shoulder joint setup into the pre-existing rig (mixamo character skeleton), how would that affect my ability to retarget mocap information? Would I need to specify those joints in the character definition tag?

Any further information you may be able to provide would be greatly appreciated!

Hi Dr. Sassi,

Thank you for the further information. I will check out the resources you provided.

Will likely try and go the constraint route as that seems more straightforward than adding more bones and re-weight painting things. Appreciate your feedback

I'm trying to figure out how to rig the shoulder of this character so that it moves in a mechanical fashion instead of completely together (as a shoulder normally would). This character is a robot, so it would make sense for the different parts of the shoulder to serve different rotation purposes.

More specifically- I'm wanting the selected piece of the model (in the image) to rotate according to the shoulder but have its positioned constrained to the collar. I'd also like the cylindrical piece (inside the highlighted object) to rotate freely but have it's position constrained to stay in place. That way when the arm is rotated up (think T-pose) the cylinder rotates as well but the highlighted object stays in place.

I currently have the entire mechanism weight painted to the shoulder joint and am trying to understand what needs to be done to make this work as I'm intending? Do I need to remove the weight painting from the mechanism and use constraint tags on those objects in particular?