The development of using Spine for VTubing is ongoing, with several updates and improvements being made over time by SilverStraw. The Spine Vtuber Prototype has seen multiple iterations, with improvements in face tracking, animation smoothness, and the ability to handle multiple keyframes and face meshes.
One of the key updates includes the ability to record motion captured from a camera and export it as a JSON file, which can then be imported into Spine. This feature is particularly useful for creating animations that sync with live recordings.
For more detailed information and to follow the latest updates, you can check out the ongoing discussions and shared prototypes in the Spine forum threads, such as the Spine Pro Vtuber Working Prototype.