I've been interested in different methods of getting a 'rubberhose' effect on limbs for character rigs. Rubberhose (Or spaghetti limbs) is when arms or legs don't stay rigid, but can curl and warp into more organic shapes. It's really cool for getting a more stylistic, cartoon-ish quality to animation. Think Adventure Time, but pulling it off in 3D.
It's pretty straight-forward to pull off, all you need is a standard ribbon setup to drive the shape of the limbs. It even works with stretching!
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