zwitschi
ab9c67d266
Measure all eight exported characters and record the stylized proportion bands. All variants pass; no skeleton or mesh rescale was needed.
202 lines
7.0 KiB
Python
202 lines
7.0 KiB
Python
#!/usr/bin/env python3
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"""Audit the procedural NPC library against a shared proportion guide.
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The measurements come from the exported GLBs, not from authored node values:
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head bounds use Head/skin vertices, shoulder silhouette uses the upper-chest
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band, hip width uses pants vertices and limb lengths use the rest-pose bones.
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This keeps the report valid for every character variant even when clothing or
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hair changes the overall bounds.
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Run outside Blender:
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python3 tools/npc_proportions.py report
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python3 tools/npc_proportions.py report --json
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"""
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from __future__ import annotations
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import argparse
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import json
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import math
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from pathlib import Path
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from blender_assets import _accessor, _read_glb, asset_path
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ROOT = Path(__file__).resolve().parent.parent
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# Ratios are measured against total standing height. These are stylized-but-
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# credible bands, not photoreal anatomy: the character is deliberately a low-
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# poly adult with a somewhat larger head and a broad build option.
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GUIDE = {
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"head_height": (0.16, 0.22),
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"head_aspect": (0.70, 1.00),
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"shoulder_width": (0.28, 0.38),
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"hip_width": (0.17, 0.23),
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"torso_length": (0.28, 0.38),
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"leg_length": (0.40, 0.48),
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"arm_length": (0.28, 0.38),
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"foot_length": (0.12, 0.18),
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}
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def _qmul(a, b):
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ax, ay, az, aw = a
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bx, by, bz, bw = b
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return (aw * bx + ax * bw + ay * bz - az * by,
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aw * by - ax * bz + ay * bw + az * bx,
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aw * bz + ax * by - ay * bx + az * bw,
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aw * bw - ax * bx - ay * by - az * bz)
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def _qrot(q, v):
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x, y, z, w = q
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tx = 2.0 * (y * v[2] - z * v[1])
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ty = 2.0 * (z * v[0] - x * v[2])
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tz = 2.0 * (x * v[1] - y * v[0])
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return (v[0] + w * tx + (y * tz - z * ty),
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v[1] + w * ty + (z * tx - x * tz),
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v[2] + w * tz + (x * ty - y * tx))
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def joint_positions(gltf):
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"""World rest-pose joint centres from the glTF node hierarchy."""
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nodes = gltf["nodes"]
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parent = {}
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for index, node in enumerate(nodes):
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for child in node.get("children", []):
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parent[child] = index
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roots = [i for i in range(len(nodes)) if i not in parent]
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out = {}
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def walk(index, parent_t=(0.0, 0.0, 0.0), parent_q=(0.0, 0.0, 0.0, 1.0)):
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node = nodes[index]
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translation = node.get("translation", [0.0, 0.0, 0.0])
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rotation = node.get("rotation", [0.0, 0.0, 0.0, 1.0])
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rotated = _qrot(parent_q, translation)
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world = tuple(parent_t[i] + rotated[i] for i in range(3))
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out[node.get("name", "")] = world
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child_q = _qmul(parent_q, rotation)
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for child in node.get("children", []):
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walk(child, world, child_q)
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for root in roots:
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if nodes[root].get("name") == "Armature":
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walk(root)
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return out
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def mesh_vertices(gltf, binary):
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"""Return (position, strongest bone, material) for every GLB vertex."""
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nodes = gltf["nodes"]
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joints = [nodes[j].get("name", "") for j in gltf["skins"][0]["joints"]]
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materials = [m.get("name", "") for m in gltf.get("materials", [])]
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out = []
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for mesh in gltf.get("meshes", []):
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for prim in mesh.get("primitives", []):
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attrs = prim.get("attributes", {})
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if "POSITION" not in attrs or "JOINTS_0" not in attrs or "WEIGHTS_0" not in attrs:
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continue
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positions = _accessor(gltf, binary, attrs["POSITION"])
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joint_rows = _accessor(gltf, binary, attrs["JOINTS_0"])
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weight_rows = _accessor(gltf, binary, attrs["WEIGHTS_0"])
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mat_index = prim.get("material")
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material = materials[mat_index] if mat_index is not None and mat_index < len(materials) else ""
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for pos, joint_row, weight_row in zip(positions, joint_rows, weight_rows):
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strongest = max(range(4), key=lambda i: weight_row[i])
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index = joint_row[strongest]
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bone = joints[index] if index < len(joints) else ""
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out.append((pos, bone, material))
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return out
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def _span(values):
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return max(values) - min(values) if values else 0.0
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def measure(name):
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_magic, _version, _length, _size, gltf, binary = _read_glb(asset_path("npc", name))
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joints = joint_positions(gltf)
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verts = mesh_vertices(gltf, binary)
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ys = [p[1] for p, _bone, _material in verts]
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height = _span(ys)
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head = [p for p, bone, material in verts if bone == "Head" and material == "skin"]
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shoulder_y = joints["ShoulderL"][1]
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shoulder = [p for p, _bone, _material in verts
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if shoulder_y - 0.08 <= p[1] <= shoulder_y + 0.06]
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hip = [p for p, bone, material in verts
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if bone in ("HipL", "HipR") and material == "pants"]
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feet = [p for p, bone, _material in verts
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if bone in ("KneeL", "KneeR") and p[1] < 0.2]
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head_h = _span([p[1] for p in head])
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head_w = _span([p[0] for p in head])
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shoulder_w = _span([p[0] for p in shoulder])
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hip_w = _span([p[0] for p in hip])
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torso = shoulder_y - joints["Spine"][1]
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leg = joints["Spine"][1] - min(ys)
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arm = shoulder_y - joints["HandL"][1]
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foot = _span([p[2] for p in feet])
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values = {
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"height": height,
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"head_height": head_h,
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"head_width": head_w,
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"shoulder_width": shoulder_w,
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"hip_width": hip_w,
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"torso_length": torso,
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"leg_length": leg,
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"arm_length": arm,
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"foot_length": foot,
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}
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ratios = {
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"head_height": head_h / height,
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"head_aspect": head_w / head_h,
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"shoulder_width": shoulder_w / height,
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"hip_width": hip_w / height,
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"torso_length": torso / height,
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"leg_length": leg / height,
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"arm_length": arm / height,
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"foot_length": foot / height,
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}
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checks = {}
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for key, (low, high) in GUIDE.items():
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value = ratios[key]
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checks[key] = {
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"value": round(value, 3),
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"range": [low, high],
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"status": "ok" if low <= value <= high else "outside",
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}
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return {
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"character": name,
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"measurements": {key: round(value, 3) for key, value in values.items()},
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"ratios": {key: round(value, 3) for key, value in ratios.items()},
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"checks": checks,
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}
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def report():
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from blender_assets import CHARACTERS
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return [measure(name) for name in CHARACTERS]
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def main(argv=None):
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parser = argparse.ArgumentParser(description=__doc__)
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sub = parser.add_subparsers(dest="command", required=True)
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show = sub.add_parser("report")
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show.add_argument("--json", action="store_true")
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args = parser.parse_args(argv)
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if args.command != "report":
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return 1
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rows = report()
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if args.json:
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print(json.dumps(rows, indent=2))
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return 0
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for row in rows:
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print(f"{row['character']:16s} height={row['measurements']['height']:.3f} m")
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for key, check in row["checks"].items():
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print(f" {key:18s} {check['value']:.3f} "
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f"target {check['range'][0]:.2f}-{check['range'][1]:.2f} "
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f"{check['status']}")
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return 0
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if __name__ == "__main__":
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raise SystemExit(main())
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