Writing
Notes from building this
Mostly about the retarget, because that is where all the difficulty actually lives.
Retargeting
Why generated animation slides, and what actually fixes it
Foot sliding is not a rendering artefact or a frame-rate problem. It is what happens when you copy joint angles between two skeletons with different leg lengths and never check where the foot ended up.
Retargeting
Retargeting to R15 is a proportion problem, not an angle problem
Fifteen boxes on Motor6Ds is not a small human. Treating it like one is what produces the uncanny, slightly-off look people associate with generated animation.
Engineering
A cold start is not a hang, so stop rendering it like one
Scale-to-zero GPU inference means some requests wait for a container. The engineering problem is real but small; the product problem is entirely about what you show while it happens.