*@c.haas* Thanks! The course overall is already a big long-term undertaking but I'll add as much content as I can. Unfortunately I am not a rigger so I can't really teach much in that area. Perhaps someone else will create a full rigging course at some point.

@tane Thank you :3 I'm glad you are enjoying it.

@ArcticFox Thanks! The Pose Library is just storing actions (armature animation), so no. The only way of storing shapekeys in a pose library is by hooking it up to a bone via a driver and adding a pose via that bone.

@Jonathan Doe Thanks for the detailed comment with the link. That made it very clear.    These are exactly the things that are found out while expression testing! I have some solutions to your problem:

First off you are probably adjusting the open mouth angle & position of the lower teeth on the base shape and not on the shapekey. That's why the original shape is now messed up. Try to never make adjustments on the base shape but always on the existing or new shapekeys, since that is easier to undo.

But I think there is another solution to your problem. Look up skull pictures from the side. You can notice there that the teeth & jaw are actually angled slightly. Your model has very horizontally straight teeth. So if you angle the teeth and gums to point upwards towards the back of the head, then you will have more space to rotate the lower teeth with the jaw.

Definitely keep in mind that the lower teeth are stuck to the jaw. So they have the exact same rotation point under the ears. In your tests the teeth are rotating at the molars which looks unnatural.

But really great work so far! Keep it up :D

@Julien Kaspar

Thanks so much for the workarounds, Julian! : D

Also oh my god, you’re right about the teeth! Google is indeed one’s friend lol.

I angled the teeth and gums for both jaws slightly. But because they are both altered to be slightly angled at the same degree, this still replicates the initial issue I was having. The good news however is if I were to exaggerate the bottom jaw to get what I want, it does allow more room for it!

The bad news is I’m still having the issue illustrated in my initial post of the lower jaw becoming misaligned despite making all of my edits on the “mouth open” shape key.

I rewatched section-3 video-4 to see if there was something I missed concerning the drivers, but they all appear to be synched. Yet I’m clearly doing something wrong. What is I do not know. 🤔

I’ve put in a new blender file for the new arrangement of the teeth.

https://drive.google.com/drive/u/0/folders/1Oq3311r-SeWuZ44-wRG9icdqQOMbSxtV

In the meantime ( when you get the chance to check this new file out ), I’ll keep messing with it and researching to see if I can find a solution.

@Jonathan Doe I don't think you made the edits on the "mouth open" shapekeys. If the base shape is misaligned then you accidentally made edits on the base shape.

For the jaw vs teeth issue: I think you need to make a creative decision to either make the jaw less steep or angle the teeth even more. That way both have roughly the same angle and can rotate together.

@Julien Kaspar  Hmm - so if it's the first error, what would be the workaround? Would I need to [1] somehow reset the base key or [2] remove the drives from the mouth and teeth and reset those?

✅ Update: You were absolutely correct, Julian. 😂 I was thinking the error was with the base driver on my body. Not the case! It was the base drivers on the teeth and gums themselves. Slowing down the video and noticing the error I made in following along did the trick. 👍

Thanks for taking the time to help me through this. I seriously appreciate it.