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I just had a genius idea for budget Vtubing:
what if instead of using facial tracking technology, you were to just puppeteer and actual, physical cardboard cutout of your character?
You could then wear one of those green screen suit combined with a regular greens screen to simply key yourself out to be complete invisible .
the various facial features could be controlled by physical sliding and rotation them along joint and tracks, the mouth could be changed by rotation a multi-sided cylinder with various mouths painted on each side and the limb can simply posed with rotating hinges.
You'd be surprised how expressive you can get with just some simple movements.
It's basically just an analog version of what the software does.
webm related, a mock-up I spent an embarrassing amount of time on