Hello, I have an issue when retargeting a thumb from motion capture to a character in Maya or MotionBuilder. The character's thumb spreads too much. While this can be corrected with an animation layer, I would like to know how to avoid this artifact in the first place.
Could someone please help me resolve this issue?
https://drive.google.com/file/d/1Hzqhq_6m5kvUNfQZyVWGEZPSTAIXmXL7/view?usp=sharing
https://drive.google.com/file/d/1Hzqhq_6m5kvUNfQZyVWGEZPSTAIXmXL7/view?usp=sharing
Thank you!
Thumbs can be difficult to solve and retarget. The image is only one view, but the mocap rig's thumb doesn't look bad. You could try and tweak/adjust the thumb's pose on the target rig while in a T pose before retargeting.
This occurs when there is a discrepancy between the bone data on the motion capture side and the initial rotation values on the 3D model side.
Cause
The initial rotation value of the root of the thumb in motion capture is usually (0,0,0) with the thumb in a closed posture [Image 1], but in most cases, the initial value of the thumb in the 3D model is in an open state. [Image 2].
Solution.
Since it is not practical to change the thumb on the motion capture side, try offsetting the 3D model's thumb so that it is parallel to the ground, then characterize and retarget it.
Note that in this case, when the rig is in bound pose, the thumbs will also be in the position they were in when the rig was set.
Translated with DeepL.com (free version)
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