How do primary motion-generation papers define foot skating, penetration, floating and jitter, with what thresholds and units?
Definitions differ by paper. PhysDiff (v3): Penetrate and Float are distances from the ground to the lowest body mesh vertex with 5 mm tolerance, Skate is mean horizontal displacement of foot joints in contact in two adjacent frames, Phys-Err is their sum, all in mm. GMD (v3) and Yi et al. (v1) use a skating ratio: fraction of frames where a foot slides more than 2.5 cm while foot height is under 5 cm. Body-momentum (v1) measures jitter as the derivative of acceleration in world coordinates (10 m/s^3) and foot sliding in mm during contact. MDM v2 uses a foot-contact loss in training, not an evaluation metric.
Definitions differ by paper. PhysDiff (v3): Penetrate and Float are distances from the ground to the lowest body mesh vertex with 5 mm tolerance, Skate is mean horizontal displacement of foot joints in contact in two adjacent frames, Phys-Err is their sum, all in mm. GMD (v3) and Yi et al. (v1) use a skating ratio: fraction of frames where a foot slides more than 2.5 cm while foot height is under 5 cm. Body-momentum (v1) measures jitter as the derivative of acceleration in world coordinates (10 m/s^3) and foot sliding in mm during contact. MDM v2 uses a foot-contact loss in training, not an evaluation metric.
Curator qualifications: Excerpted evidence located (one excerpt-less row); foot-skating/penetration/floating/jitter definitions with thresholds per paper.
Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.
Structured fields
{
"citations": [
{
"url": "https://arxiv.org/abs/2212.02500v3",
"note": "candidate evidence excerpts"
},
{
"url": "https://arxiv.org/abs/2305.12577v3",
"note": "candidate evidence excerpts"
},
{
"url": "https://arxiv.org/abs/2404.10685v1",
"note": "candidate evidence excerpts"
},
{
"url": "https://arxiv.org/abs/2509.09496v1",
"note": "candidate evidence excerpts"
},
{
"url": "https://arxiv.org/abs/2209.14916v2",
"note": "candidate evidence excerpts"
},
{
"url": "https://arxiv.org/abs/2507.05419v1",
"note": "candidate evidence excerpts"
}
]
}Evidence claims
- [sourced_fact] Definitions differ by paper. PhysDiff (v3): Penetrate and Float are distances from the ground to the lowest body mesh vertex with 5 mm tolerance, Skate is mean horizontal displacement of foot joints in contact in two adjacent frames, Phys-Err is their sum, all in mm. GMD (v3) and Yi et al. (v1) use a skating ratio: fraction of frames where a foot slides more than 2.5 cm while foot height is under 5 cm. Body-momentum (v1) measures jitter as the derivative of acceleration in world coordinates (10 m/s^3) and foot sliding in mm during contact. MDM v2 uses a foot-contact loss in training, not an evaluation metric. · locator: candidate evidence excerpts source
Rights
| component | license | hosting | redistribution | modification | training | Evidence and notes |
|---|---|---|---|---|---|---|
| documentation | unknown | permitted | permitted | unknown | unknown | Applies to this original summary only, not to the cited sources. |