body and feet slide problem

[zwukong]

body slide problem is very common, although fast sam3d body have fixed some

[AmmarkoV]

Foot/body sliding ("foot skating") is the classic artifact of any per-frame, monocular 3D pose estimator.

Why it happens. Each frame is reconstructed independently. The network has no notion of the ground plane and no temporal contact constraint, so the
global root translation is solved per-frame from a weak monocular depth cue. Small per-frame depth/scale errors turn into visible horizontal drift,
and because nothing pins the foot to the floor, the planted foot slides instead of staying fixed.

What's in progress in this code-base:

• Foot-contact detection. Detecting when each foot (the l_ball/r_ball toe joints are already in the MHR skeleton) is planted, then constraining/zeroing its world-space
  velocity during contact so the stance foot stays fixed and the root motion is inferred from it. This is the proper fix for skating.
• Multi-view. Fusing 2+ calibrated views to resolve the depth/scale ambiguity that drives global drift in the first place, which makes contact constraints far more
  stable.

That being said these features are still under construction! :)

[zwukong]

ok, hope it will be fixed in the future 😄