42 lines
1.7 KiB
Python
42 lines
1.7 KiB
Python
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"""Regenerate hand-poses/canonical_rest.json — the canonical Quaternius finger-bone REST
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rotations, taken from the Kevin pack the hand poses were harvested against.
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The runtime needs this to apply a pose REST-RELATIVE on rigs whose finger rest differs from
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canonical (Mako's *_01 knuckles sit 11.5 deg off, so applying a canonical pose directly
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rotates his knuckles away from his own rest and tears the palm/wrist boundary):
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delta = canonical_rest^-1 * pose
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target = body_rest * delta
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usage: make_canonical_rest.py [kevin.glb] [out.json]
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"""
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import json, struct, sys
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from pathlib import Path
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REPO = Path(__file__).resolve().parents[1]
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GAME = REPO.parent / "ariki-game"
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src = Path(sys.argv[1]) if len(sys.argv) > 1 else \
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GAME / "assets/quaternius/kevin/kevin_female_combat.glb"
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out = Path(sys.argv[2]) if len(sys.argv) > 2 else REPO / "hand-poses/canonical_rest.json"
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d = src.read_bytes()
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jl = struct.unpack_from("<I", d, 12)[0]
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g = json.loads(d[20:20 + jl].decode("utf-8"))
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pose_bones = list(json.loads((REPO / "hand-poses/pose_flat.json").read_text())["bones"])
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rest = {nd.get("name"): nd.get("rotation", [0, 0, 0, 1]) for nd in g["nodes"]}
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missing = [b for b in pose_bones if b not in rest]
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if missing:
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raise SystemExit(f"canonical source lacks pose bones: {missing}")
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payload = {
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"_comment": ("Canonical Quaternius finger-bone REST rotations. The runtime applies a "
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"pose rest-relative: delta = canonical_rest^-1 * pose, "
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"target = body_rest * delta. Regenerate with tools/make_canonical_rest.py."),
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"source": src.name,
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"bones": {b: [round(v, 8) for v in rest[b]] for b in pose_bones},
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}
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out.write_text(json.dumps(payload, indent=1))
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print(f"wrote {out} with {len(payload['bones'])} bones from {src.name}")
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