Files
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

40 lines
1.4 KiB
JSON

{
"name": "Dumbbell Fly",
"primary": 2,
"camera": {"yaw": 90},
"working": ["arm_r", "arm_l"],
"props": [
{"type": "scene", "shapes": [
{"kind": "line", "pts": [[148, 124], [172, 124]], "w": 8, "depth": 40},
{"kind": "line", "pts": [[154, 129], [154, 150]], "w": 4},
{"kind": "line", "pts": [[166, 129], [166, 150]], "w": 4}
]},
{"type": "dumbbell", "at": "hand_r"},
{"type": "dumbbell", "at": "hand_l"}
],
"frames": [
{
"hold": 0.5, "tween": 1.0,
"root": {"pos": [160, 116], "pitch": -90},
"spine": [0, 0],
"neck": 8, "head": 0,
"shoulder_r": 88, "elbow_r": 12,
"shoulder_l": 88, "elbow_l": 12,
"hip_r": {"flexion": 10, "abduction": 15}, "knee_r": 93, "ankle_r": 5,
"hip_l": {"flexion": 7, "abduction": 16}, "knee_l": 91, "ankle_l": 5,
"pins": {"foot_r": [145, 148], "foot_l": [176, 150]}
},
{
"hold": 0.5, "tween": 1.3,
"root": {"pos": [160, 116], "pitch": -90},
"spine": [0, 0],
"neck": 8, "head": 0,
"shoulder_r": {"flexion": 16, "abduction": 84}, "elbow_r": 22,
"shoulder_l": {"flexion": 16, "abduction": 84}, "elbow_l": 22,
"hip_r": {"flexion": 10, "abduction": 15}, "knee_r": 93, "ankle_r": 5,
"hip_l": {"flexion": 7, "abduction": 16}, "knee_l": 91, "ankle_l": 5,
"pins": {"foot_r": [145, 148], "foot_l": [176, 150]}
}
]
}