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samibiloff
New Participant
May 9, 2023
Question

Shoulders and Arms Issues

  • May 9, 2023
  • 1 reply
  • 1430 views

Hello!

I'm new to Character Animator and can't for the life of me figure out why it's not working. Specifically it's the arms and shoulders that get all distorted when it looks like it's rigged properly to me. I had markers in to keep the forearms and biceps stiff but took them out in case that was causing an issue but I'm having the same problem either way.

 

Any help would be great- thanks!

 

Video of problem

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1 reply

J
Adobe Employee
j-saito
Adobe Employee
May 9, 2023

Thanks for posting with a video! This really helps us to understand what you are looking for.

 

  • Try putting stick handles through the arms, like bones, so they don't deform unnaturally (is this what you meant by "markers?")
  • Try taking out Fixed handles from the "Torso" layer
  • In the Face behavior, try reducing "Head Scale Strength"
  • When body tracking, you want to recalibrate after you position yourself to start the performance. Ideally, you want to somehow "Calibrate" at around 0:34 in your video as you step back and position yourself in an A-pose. By default, you have 5 seconds to position yourself after you hit "Calibrate" during body tracking. You can change this duration by going Timeline > Body Tracker Countdown

 

We can take a further look at your puppet if needed. You can export your puppet, put it on your Google Drive, and share a link here (or DM me the link if you want to keep the puppet private).

S
samibiloffAuthor
New Participant
May 9, 2023

Thank you! Following your feedback I was able to get the arms functioning pretty well and I set back my calibration time. But the problem with the shoulders still persists. 

 

Here is a link to my puppet. 

J
Adobe Employee
j-saito
Adobe Employee
May 9, 2023

My version, with bonus features: full-body tracking + motion library. Now you can make your Rosie dance.

https://shared-assets.adobe.com/link/c16a2daa-b493-4ba3-584a-b0b6adc5b9e1

 

Rigging tips

  • Face behavior: reduce the "Head Scale Strength". The shoulder problem is most likely from this. With the default, the size of the puppet's head changes too much as you come closer/away from the camera. The deformation of the head will end up affecting the shoulders of your puppet because the head and the body layers are dependent (not crowned)
  • For multi-layered full-body puppets, avoid using Fixed handles expecting them to pin feet to the ground or pin a part of the body to the scene. Fixed handles can help prevent local deformations, but they will not pin the puppet to a scene location (unless your puppet is very simple).
  • Unless there is a specific need, avoid scattering behaviors across many layers. I took out Limb IK on the "Left Arm" and Body behavior on the "Body" layer and consolidated them at the top level.
  • Just like how your puppet's arms are independent (crowned) layers, legs also need to be independent for full-body rigging. Usually, people set up the left and right legs as separate layers in the original Ai/Ps art. In your case, I crowned the "Pants" layer with both left and right legs, adjusted the origin position to overlap with the "Body" layer, and then stitched together the "Pants" layer to the "Body" layer with Leader/Follower.
  • Leg rigging: you need left/right heels (not ankles) for the Body, Limb IK, and Motion Library behaviors. Having toes also help with better animation.
  • Arm/leg rigging: make your stick handles longer

 

I also removed redundant body-tagged handles from the "Torso" layer and tweaked the placement of the handles.

 

Let us know if you still see undesirable deformations, or have more questions!

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