Files
workouts/Exercise Library/Rotary/motion.json
T
rzen 79e75a9127 Fix figure IK snapping and gate the library on a fail-hard motion checker
Three solver defects made limbs teleport, twist, or windmill: write-back
angles wrapped at ±180 and lerped the long way around; branch flips landed
on configurations the anatomical write-back cannot represent, silently
pulling pinned extremities off their pins; and the degenerate straight-limb
bend plane fell back to the camera axis instead of the anatomical anterior.
solve_limb now verifies each branch reproduces the solved end before
accepting it, resolve unwraps written-back angles toward the pose they
replace, and the degenerate plane comes from the parent's anterior axis.

render.py --check replays every exercise's full tween loop and fails hard
on six invariants (pin fidelity, continuity, wraps, authored-vs-resolved
drift, ground penetration, resolved ROM); --export refuses to ship a
failing exercise. All 66 motions re-authored or retouched to pass: honest
authored angles where pins used to override them silently, grounded feet
on the seated machines, a vertical bench-press bar path, straight-armed
child's pose, a butterfly stretch seated on the mat, and FK arms where
pins forced impossible reaches. MotionSolver.swift mirrors the solver
changes line for line, held by regenerated fixtures.

Claude-Session: https://claude.ai/code/session_01PKptrgbx74peTwHGRxBojv
2026-07-12 00:37:23 -04:00

37 lines
1.2 KiB
JSON

{
"name": "Rotary",
"primary": 1,
"camera": {"yaw": 90},
"working": ["spine"],
"props": [
{"type": "scene", "shapes": [
{"kind": "line", "pts": [[138, 130], [182, 130]], "w": 8, "depth": 10},
{"kind": "line", "pts": [[160, 132], [160, 150]], "w": 5},
{"kind": "line", "pts": [[144, 150], [176, 150]], "w": 5, "depth": 5}
]},
{"type": "bar", "at": ["hand_r", "hand_l"], "angle": 90, "halfLen": 14}
],
"frames": [
{
"hold": 0.4, "tween": 1.0,
"root": {"pos": [160, 122]},
"spine": [{"rotation": -28}, {"rotation": -22}],
"neck": {"rotation": 18},
"shoulder_r": 70, "elbow_r": 10,
"shoulder_l": 70, "elbow_l": 10,
"hip_r": {"flexion": 104, "abduction": 16}, "knee_r": 104,
"hip_l": {"flexion": 104, "abduction": 16}, "knee_l": 104
},
{
"hold": 0.4, "tween": 1.0,
"root": {"pos": [160, 122]},
"spine": [{"rotation": 28}, {"rotation": 22}],
"neck": {"rotation": -18},
"shoulder_r": 70, "elbow_r": 10,
"shoulder_l": 70, "elbow_l": 10,
"hip_r": {"flexion": 104, "abduction": 16}, "knee_r": 104,
"hip_l": {"flexion": 104, "abduction": 16}, "knee_l": 104
}
]
}