Track C: Codex with GPT-6.1-Terra end to end

input

{
  "cell_id": "75",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 15.5 seconds
Output:
{"chunk_id":"9ff645","wall_time_seconds":50.001761219,"session_id":21889,"original_token_count":103,"output":"arm_f_slender ~/Projects/lowmarch-bench/work/c/shot_r3/lip_U/painted_arm_f_slender.png 17s\narm_m_youth ~/Projects/lowmarch-bench/work/c/shot_r3/lip_U/painted_arm_m_youth.png 13s\narm_f_slender ~/Projects/lowmarch-bench/work/c/shot_r3/neutral/painted_arm_f_slender.png 12s\narm_m_youth ~/Projects/lowmarch-bench/work/c/shot_r3/neutral/painted_arm_m_youth.png 9s\n"}

input

const r=await tools.write_stdin({session_id:21889,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 76
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "76",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 16.4 seconds
Output:
{"chunk_id":"1c582b","wall_time_seconds":50.002821216,"session_id":21889,"original_token_count":101,"output":"arm_f_slender ~/Projects/lowmarch-bench/work/c/shot_r3/sad/painted_arm_f_slender.png 12s\narm_m_youth ~/Projects/lowmarch-bench/work/c/shot_r3/sad/painted_arm_m_youth.png 10s\narm_f_slender ~/Projects/lowmarch-bench/work/c/shot_r3/shout/painted_arm_f_slender.png 12s\narm_m_youth ~/Projects/lowmarch-bench/work/c/shot_r3/shout/painted_arm_m_youth.png 12s\n"}

input

const r=await tools.write_stdin({session_id:21889,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 77
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "77",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 16.0 seconds
Output:
{"chunk_id":"329bed","wall_time_seconds":50.000563895,"session_id":21889,"original_token_count":102,"output":"arm_f_slender ~/Projects/lowmarch-bench/work/c/shot_r3/smile/painted_arm_f_slender.png 16s\narm_m_youth ~/Projects/lowmarch-bench/work/c/shot_r3/smile/painted_arm_m_youth.png 14s\narm_f_slender ~/Projects/lowmarch-bench/work/c/shot_r3/smug/painted_arm_f_slender.png 17s\narm_m_youth ~/Projects/lowmarch-bench/work/c/shot_r3/smug/painted_arm_m_youth.png 14s\n"}

input

const r=await tools.write_stdin({session_id:21889,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 78
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "78",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 8.0 seconds
Output:
{"chunk_id":"0eeb13","wall_time_seconds":42.292938454,"exit_code":0,"original_token_count":151,"output":"arm_f_slender ~/Projects/lowmarch-bench/work/c/shot_r3/surprised/painted_arm_f_slender.png 17s\narm_m_youth ~/Projects/lowmarch-bench/work/c/shot_r3/surprised/painted_arm_m_youth.png 14s\narm_f_slender ~/Projects/lowmarch-bench/work/c/shot_r3/wink/painted_arm_f_slender.png 15s\narm_m_youth ~/Projects/lowmarch-bench/work/c/shot_r3/wink/painted_arm_m_youth.png 12s\nshot r3\n~/Projects/lowmarch-bench/work/c/sheet_r3_woman.png (1968, 1144)\n~/Projects/lowmarch-bench/work/c/sheet_r3_youth.png (1968, 1144)\n2026-10-30T13:11:23+08:00\n"}

input

const results=await Promise.all([
tools.view_image({path:"~/Projects/lowmarch-bench/work/c/sheet_r3_woman.png",detail:"original"}),
tools.view_image({path:"~/Projects/lowmarch-bench/work/c/sheet_r3_youth.png",detail:"original"})
]);for(const r of results)image(r.image_url);

result, 4 lines

Script completed
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Output:

command

source ~/Projects/lowmarch-bench/kit/env-c.sh && sed -n '180,205p' tools/export_glb.py && sed -n '260,274p' tools/export_glb.py && sed -n '900,920p' review/vroid-02/index.html && sed -n '925,960p' review/vroid-02/index.html

result, 102 lines

Script completed
Wall time 0.2 seconds
Output:
CLOTH_HEM_ONLY = {"OUTFIT_skirt"}            # border band on the hem row only (its waist has a gold trim)


def scene_info(portrait, palette):
    """Everything the browser's pixel renderer and cloth solver need besides the meshes: palette
    bands per role, the lights, body colliders, cloth grids and the mouth curve (model space,
    turned to face +z like the GLB)."""
    import vroid_portrait as vp
    from vrm import bone_weight
    hexp = lambda c: palette[c]
    bands = lambda tbl: [[thr if thr > -5 else -9, hexp(c)] for thr, c in tbl]
    roles = {"face": dict(mode="bands", bands=bands(vp.SKIN_BANDS)),
             "body": dict(mode="bands", bands=bands(vp.SKIN_BANDS), cap=hexp("4")),
             "shadow": dict(mode="flat", color=hexp("3")),
             "hair": dict(mode="bands", bands=bands(vp.HAIR_BANDS)),
             "cloth": dict(mode="bands", bands=bands(vp.CLOTH_BANDS)),
             "line": dict(mode="flat", color=hexp("o")), "brow": dict(mode="flat", color=hexp("A")),
             "mouth": dict(mode="flat", color=hexp("1")), "white": dict(mode="flat", color=hexp("w")),
             "highlight": dict(mode="flat", color=hexp("w")),
             "iris": dict(mode="iris", colors=[hexp("r"), hexp("s"), hexp("t")], cuts=[0.25, 0.5])}
    for r, tbl in vp.MATERIALS.items():
        roles[r] = dict(mode="bands", bands=bands(tbl), world=r in vp.WORLD_ROLES)
    names = portrait.v.nodes_by_name()
    W = portrait.v.node_world(portrait.pose_now)
    body = [p for p, r in zip(portrait.prims, portrait.roles) if r == "body"][0]
    caps = []
        if role not in paint and isinstance(val, str) and val.startswith("#"):
            paint[role] = dict(kind="cloth", base=val)
        elif role not in paint and isinstance(val, dict) and "base" in val:
            paint[role] = dict(kind=val.get("kind", "cloth"), base=val["base"])
    for role, g in (pc.get("grain") or {}).items():          # optional per-role brush grain (big flat cloth mottles)
        if role in paint:
            paint[role]["grain"] = g
    return dict(roles=roles, light=vp.LIGHT.tolist(), sun=vp.SUN.tolist(), capsules=caps, cloth=cloth, face_marks=marks,
                paint=paint,
                mouth_curve=curve, mouth_bone="J_Bip_C_Head", ink=dict(o=hexp("o"), skin=hexp("1"), hair=hexp("A")),
                skin=[hexp(c) for c in "12345"], depth_gap=0.012)


# ---- skinned export: one rigged character + animation clips --------------------------------------------------------
F4 = np.diag([-1.0, 1.0, -1.0, 1.0])
}

async function loadCharacter(name) {
  if (chars.has(name)) return chars.get(name);
  const def = charDef(name), V = def.info, ci = CAM.characters.indexOf(def);
  const gltf = await parseGlb(`${name}.glb.json`);
  const turn = new THREE.Group(), holder = new THREE.Group();
  turn.add(holder); holder.add(gltf.scene);
  const meshes = [];
  gltf.scene.traverse(o => { if (o.isMesh) { prepMesh(o, V, { hairB: ci > 0 }); meshes.push(o); } });
  gltf.scene.updateMatrixWorld(true);
  const bone = n => gltf.scene.getObjectByName(n);
  const cloths = [], world = new THREE.Group();
  for (const [cname, info] of Object.entries(V.cloth || {})) {
    const skinned = meshes.find(m => m.userData.material === cname);
    if (!skinned) continue;
    const trims = meshes.filter(m => info.trims.includes(m.userData.material));
    const caps = V.capsules.filter(c => !info.collide || info.collide.some(k => c.bones[0].includes(k)));
    const cl = info.closed ? new SkirtRig(skinned, info.u, info.v, trims, caps, bone, info.edges === "hem")
                           : new Cloth(skinned, info.u, info.v, trims, caps, bone, false, info.edges === "hem");
    const band = info.band || "gold", BR = V.roles[band] || V.roles.gold;
    cl.lines3d.frustumCulled = false;
    world.add(cl.display, cl.lines3d);
    cloths.push(cl);
  }
  const mixer = new THREE.AnimationMixer(gltf.scene);
  const actions = Object.fromEntries(gltf.animations.map(c => [c.name, mixer.clipAction(c)]));
  const skeleton = meshes.find(m => m.isSkinnedMesh)?.skeleton;
  const c = { name, info: V, turn, holder, root: gltf.scene, meshes, cloths, world, mixer, actions, skeleton,
              clip: "idle", t: 0, groups: [...new Set(meshes.map(m => m.userData.group))] };
  c.springs = makeSprings(c, V.springs);
  chars.set(name, c);
  return c;
}

async function loadGround() {
  if (ground) return ground;
  const V = CAM.characters[0].info, gltf = await parseGlb("plains.glb.json"), meshes = [];
  gltf.scene.traverse(o => { if (o.isMesh) { prepMesh(o, V); meshes.push(o); } });
  ground = { root: gltf.scene, meshes };
  return ground;
}

const allMeshes = () => [...active().flatMap(c => [...c.meshes, ...c.cloths.map(cl => cl.display)]),
                         ...(ground && ground.root.parent && state.view !== "bust" ? ground.meshes : [])];
const isSimTrim = o => state.cloth && active().some(c => c.cloths.some(cl => cl.trims.includes(o) || cl.skinned === o));
function applyMaterials() {
  allMeshes().forEach(o => {
    const mat = state.toon ? o.userData.mats.toon : o.userData.mats.clay;
    const x = state.xray && COSTUME.has(o.userData.group);
    mat.transparent = x; mat.opacity = x ? 0.28 : 1; mat.depthWrite = !x; mat.needsUpdate = true;
    o.userData.mat3d = mat;
    const isDisplay = o.userData.cloth;
    o.visible = !state.hidden.has(o.userData.group) && (isDisplay ? state.cloth : !isSimTrim(o));
  });
}
const trimsShown = c => state.cloth && !state.hidden.has("trim") && !state.hidden.has(c.skinned.userData.group);

command

source ~/Projects/lowmarch-bench/kit/env-c.sh && cat >> "$WORK/NOTES.md" <<'EOF'

## Round 3 — 13:03:30–13:11:23 (7m 53s)

Added localized contrast to dark lip texels in the shared face-atlas mouth window, faded the brow overlay at its distance limit, and tried hiding eye highlights in joy. Rendered all expressions. Neutral and open mouths remain sound at 0 and 30 degrees, while closed smiles gain some contrast. The angry frown is still almost absent in its center because the texture compresses there. Tiny pale flecks remain in the youth's closed eyelash texture despite the highlight-hide shape. The woman's close and wink have slightly ragged lash ends.
EOF
python3 - <<'PY'
from pathlib import Path
p=Path('tools/export_glb.py')
s=p.read_text().replace('    return dict(roles=roles, light=vp.LIGHT.tolist(), sun=vp.SUN.tolist(), capsules=caps, cloth=cloth, face_marks=marks,', '''    # A fully closed angry mouth compresses its painted lip texture until the middle disappears.
    # Use the existing surface-following curve only for that closed frown, not for open mouths.
    rest = portrait.shape.get("rest", {})
    frown = max(rest.get("Fcl_MTH_Angry", 0), rest.get("Fcl_ALL_Angry", 0)) > 0.1
    openings = ("Fcl_MTH_A", "Fcl_MTH_I", "Fcl_MTH_U", "Fcl_MTH_E", "Fcl_MTH_O",
                "Fcl_MTH_Joy", "Fcl_MTH_Sorrow", "Fcl_MTH_Surprised", "Fcl_ALL_Joy",
                "Fcl_ALL_Sorrow", "Fcl_ALL_Surprised")
    mouth_ink = bool(curve is not None and frown and not any(rest.get(k, 0) > 0.05 for k in openings))
    return dict(roles=roles, light=vp.LIGHT.tolist(), sun=vp.SUN.tolist(), capsules=caps, cloth=cloth, face_marks=marks,''')
s=s.replace('mouth_curve=curve, mouth_bone="J_Bip_C_Head", ink=', 'mouth_curve=curve, mouth_bone="J_Bip_C_Head", mouth_ink=mouth_ink, ink=')
p.write_text(s)
p=Path('review/vroid-02/index.html')
s=p.read_text().replace('  const bone = n => gltf.scene.getObjectByName(n);\n  const cloths', '''  const bone = n => gltf.scene.getObjectByName(n);
  // The exported surface-following mouth curve repairs the texture's compressed closed frown.
  // Parent it to the head in bone-local coordinates so it turns with the character.
  const mouthBone = V.mouth_ink && bone(V.mouth_bone);
  if (mouthBone && V.mouth_curve && V.mouth_curve.length >= 4) {
    const points = V.mouth_curve.map(p => mouthBone.worldToLocal(gltf.scene.localToWorld(new THREE.Vector3(...p))));
    const curve = new THREE.CatmullRomCurve3(points);
    const line = new THREE.Mesh(new THREE.TubeGeometry(curve, 48, 0.00022, 5, false),
                                new THREE.MeshStandardMaterial({ color: hex(V.roles.mouth.color) }));
    line.userData.role = "mouth"; line.userData.group = "body";
    mouthBone.add(line); prepMesh(line, V); meshes.push(line);
  }
  const cloths''')
p.write_text(s)
PY
$KIT/build_expr.sh "$WORK/expr_list.txt" angry && date -Is

result, 4 lines

Script completed
Wall time 1.2 seconds
Output:
{"chunk_id":"b8de1f","wall_time_seconds":1.002349958,"session_id":99335,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:99335,chars:"",yield_time_ms:20000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script completed
Wall time 14.8 seconds
Output:
{"chunk_id":"dbc8f9","wall_time_seconds":14.812644157,"exit_code":0,"original_token_count":10,"output":"built angry\n2026-10-30T13:12:08+08:00\n"}

command

source ~/Projects/lowmarch-bench/kit/env-c.sh && $KIT/shoot_expr.sh "$LOWMARCH_REPO/review/vroid-02/index.html" r4 && $KIT/sheets.sh r4 'Round 4: surface-following frown line' && date -Is

result, 4 lines

Script completed
Wall time 1.2 seconds
Output:
{"chunk_id":"89f563","wall_time_seconds":1.002239376,"session_id":4409,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:4409,chars:"",yield_time_ms:40000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 84
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "84",
  "yield_time_ms": 12000
}

result, 4 lines

Script completed
Wall time 6.3 seconds
Output:
{"chunk_id":"c82534","wall_time_seconds":40.001519766,"session_id":4409,"original_token_count":0,"output":""}

input

const im=await tools.view_image({path:"~/Projects/lowmarch-bench/work/c/shot_r4/angry/painted_arm_f_slender.png",detail:"original"});image(im.image_url);

result, 4 lines

Script completed
Wall time 0.4 seconds
Output:

input

const r=await tools.write_stdin({session_id:4409,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 86
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "86",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 15.9 seconds
Output:
{"chunk_id":"b443f5","wall_time_seconds":50.000752528,"session_id":4409,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:4409,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 87
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "87",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 16.2 seconds
Output:
{"chunk_id":"7efc54","wall_time_seconds":50.004435777,"session_id":4409,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:4409,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 88
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "88",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 15.8 seconds
Output:
{"chunk_id":"0b3981","wall_time_seconds":50.00174542,"session_id":4409,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:4409,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 89
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "89",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 14.8 seconds
Output:
{"chunk_id":"b6aa06","wall_time_seconds":50.001331293,"session_id":4409,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:4409,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 90
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "90",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 15.6 seconds
Output:
{"chunk_id":"f8996c","wall_time_seconds":50.001090283,"session_id":4409,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:4409,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 91
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "91",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 13.8 seconds
Output:
{"chunk_id":"87f96d","wall_time_seconds":50.001014025,"session_id":4409,"original_token_count":0,"output":""}

command

source ~/Projects/lowmarch-bench/kit/env-c.sh && find "$WORK/shot_r4" -name '*.png' | wc -l && date -Is

result, 6 lines

Script completed
Wall time 0.2 seconds
Output:
26
2026-10-30T13:18:30+08:00

input

const r=await tools.write_stdin({session_id:4409,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 93
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "93",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 0.0 seconds
Output:
{"chunk_id":"045ea1","wall_time_seconds":34.205683648,"exit_code":0,"original_token_count":48,"output":"shot r4\n~/Projects/lowmarch-bench/work/c/sheet_r4_woman.png (1968, 1144)\n~/Projects/lowmarch-bench/work/c/sheet_r4_youth.png (1968, 1144)\n2026-10-30T13:19:07+08:00\n"}

input

const results=await Promise.all([
tools.view_image({path:"~/Projects/lowmarch-bench/work/c/sheet_r4_woman.png",detail:"original"}),
tools.view_image({path:"~/Projects/lowmarch-bench/work/c/sheet_r4_youth.png",detail:"original"}),
tools.view_image({path:"~/Projects/lowmarch-bench/work/c/shot_r4/angry/painted_arm_m_youth.png",detail:"original"})
]);for(const r of results)image(r.image_url);

result, 4 lines

Script completed
Wall time 0.1 seconds
Output:

command

source ~/Projects/lowmarch-bench/kit/env-c.sh && python3 - <<'PY'
import os,json,struct,base64,numpy as np
from pathlib import Path
for who in ['arm_f_slender','arm_m_youth']:
 p=Path(os.environ['WORK'])/'exb/angry'/f'{who}.glb.json';b=base64.b64decode(json.loads(p.read_text())['glb']);l,_=struct.unpack_from('<II',b,12);j=json.loads(b[20:20+l]);base=20+l+8
 c=next(x for x in json.loads((p.parent/'camera.json').read_text())['characters'] if x['name']==who);pt=np.array(c['info']['mouth_curve'][12]);print(who,'curve midpoint',pt)
 def read(i):
  a=j['accessors'][i];v=j['bufferViews'][a['bufferView']];o=base+v.get('byteOffset',0)+a.get('byteOffset',0);n={'VEC3':3,'SCALAR':1}[a['type']];dt={5126:'<f4',5125:'<u4',5123:'<u2'}[a['componentType']];return np.frombuffer(b,dtype=dt,count=a['count']*n,offset=o).reshape(-1,n)
 for m in j['meshes']:
  for pr in m['primitives']:
   name=j['materials'][pr['material']]['name']
   if name not in ('body:mouth','body:face'): continue
   P=read(pr['attributes']['POSITION']);T=P[read(pr['indices']).reshape(-1)];a=T[:,0,:2];u=T[:,1,:2]-a;v=T[:,2,:2]-a;q=pt[:2]-a;det=u[:,0]*v[:,1]-u[:,1]*v[:,0];valid=np.abs(det)>1e-10;A=np.zeros(len(det));B=A.copy();A[valid]=(q[valid,0]*v[valid,1]-q[valid,1]*v[valid,0])/det[valid];B[valid]=(u[valid,0]*q[valid,1]-u[valid,1]*q[valid,0])/det[valid];ok=valid&(A>=0)&(B>=0)&(A+B<=1);Z=T[:,0,2]+A*(T[:,1,2]-T[:,0,2])+B*(T[:,2,2]-T[:,0,2]);print(name,'overlap z',Z[ok], 'difference', Z[ok]-pt[2])
PY

result, 8 lines

Script completed
Wall time 1.4 seconds
Output:
arm_f_slender curve midpoint [1.06428812e-05 1.46260855e+00 1.25786395e-01]
Traceback (most recent call last):
  File "<stdin>", line 12, in <module>
IndexError: too many indices for array: array is 2-dimensional, but 3 were indexed

command

source ~/Projects/lowmarch-bench/kit/env-c.sh && python3 - <<'PY'
import os,json,struct,base64,numpy as np
from pathlib import Path
for who in ['arm_f_slender','arm_m_youth']:
 p=Path(os.environ['WORK'])/'exb/angry'/f'{who}.glb.json';b=base64.b64decode(json.loads(p.read_text())['glb']);l,_=struct.unpack_from('<II',b,12);j=json.loads(b[20:20+l]);base=20+l+8
 c=next(x for x in json.loads((p.parent/'camera.json').read_text())['characters'] if x['name']==who);pt=np.array(c['info']['mouth_curve'][12]);print(who,'curve',pt)
 def read(i):
  a=j['accessors'][i];v=j['bufferViews'][a['bufferView']];o=base+v.get('byteOffset',0)+a.get('byteOffset',0);n={'VEC3':3,'SCALAR':1}[a['type']];dt={5126:'<f4',5125:'<u4',5123:'<u2'}[a['componentType']];return np.frombuffer(b,dtype=dt,count=a['count']*n,offset=o).reshape(-1,n)
 for m in j['meshes']:
  for pr in m['primitives']:
   name=j['materials'][pr['material']]['name']
   if name not in ('body:mouth','body:face'): continue
   P=read(pr['attributes']['POSITION']);T=P[read(pr['indices']).reshape(-1,3)];a=T[:,0,:2];u=T[:,1,:2]-a;v=T[:,2,:2]-a;q=pt[:2]-a;det=u[:,0]*v[:,1]-u[:,1]*v[:,0];valid=np.abs(det)>1e-10;A=np.zeros(len(det));B=A.copy();A[valid]=(q[valid,0]*v[valid,1]-q[valid,1]*v[valid,0])/det[valid];B[valid]=(u[valid,0]*q[valid,1]-u[valid,1]*q[valid,0])/det[valid];ok=valid&(A>=0)&(B>=0)&(A+B<=1);Z=T[:,0,2]+A*(T[:,1,2]-T[:,0,2])+B*(T[:,2,2]-T[:,0,2]);print(name,'difference',np.round(Z[ok]-pt[2],5))
PY

result, 10 lines

Script completed
Wall time 0.9 seconds
Output:
arm_f_slender curve [1.06428812e-05 1.46260855e+00 1.25786395e-01]
body:mouth difference [-0.00757 -0.00381 -0.02624 -0.00623 -0.00637 -0.01642]
body:face difference [0.00115]
arm_m_youth curve [3.67899908e-05 1.40885906e+00 1.46126439e-01]
body:mouth difference [-0.00706 -0.00371 -0.02848 -0.00432 -0.00729 -0.01997]
body:face difference [-0.0003]

command

source ~/Projects/lowmarch-bench/kit/env-c.sh && cat >> "$WORK/NOTES.md" <<'EOF'

## Round 4 — 13:11:23–13:19:07 (7m 44s)

Marked closed angry mouths at export and attached a thin curve traced from the character's own lip texture to the head bone. This tests a surface-following line rather than a camera-space mark; neutral and open mouths do not receive it. The youth's frown is now continuous and reads at 0 and 30 degrees, but on the woman only its ends are visible: the face surface occludes the middle. A geometry check found the face about 1.2 mm ahead of the curve at its center. Other expressions and neutral are unchanged from round 3.
EOF
python3 - <<'PY'
from pathlib import Path
p=Path('review/vroid-02/index.html')
s=p.read_text().replace('const points = V.mouth_curve.map(p => mouthBone.worldToLocal(gltf.scene.localToWorld(new THREE.Vector3(...p))));', '''// The deformed lip surface can stand ahead of the traced face by a millimetre.
    const points = V.mouth_curve.map(p => mouthBone.worldToLocal(
      gltf.scene.localToWorld(new THREE.Vector3(p[0], p[1], p[2] + 0.0025))));''')
p.write_text(s)
PY
$KIT/shoot_expr.sh "$LOWMARCH_REPO/review/vroid-02/index.html" r5 && $KIT/sheets.sh r5 'Round 5: forward frown line' && date -Is

result, 4 lines

Script completed
Wall time 1.2 seconds
Output:
{"chunk_id":"81e775","wall_time_seconds":1.001055897,"session_id":21752,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:21752,chars:"",yield_time_ms:40000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 98
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "98",
  "yield_time_ms": 12000
}

result, 4 lines

Script completed
Wall time 6.1 seconds
Output:
{"chunk_id":"6c7cb0","wall_time_seconds":40.001695798,"session_id":21752,"original_token_count":0,"output":""}

input

const results=await Promise.all([
tools.view_image({path:"~/Projects/lowmarch-bench/work/c/shot_r5/angry/painted_arm_f_slender.png",detail:"original"}),
tools.view_image({path:"~/Projects/lowmarch-bench/work/c/shot_r5/angry/painted_arm_m_youth.png",detail:"original"})
]);for(const r of results)image(r.image_url);

result, 4 lines

Script completed
Wall time 0.4 seconds
Output:

command

source ~/Projects/lowmarch-bench/kit/env-c.sh && cat >> docs/portrait-guide.md <<'EOF'

## Armory expression recipes

`art/expressions/armory.txt` records the fourteen named VRoid shape combinations used for the
slender woman and youth expression study. Each row is `name|shape:weight;...`; `none` is the
unmodified neutral face. The build-time `shape.rest` dictionary takes the same shape suffixes and
weights. The wink deliberately extrapolates the one-sided close to 1.5: at 1.0 the youth's
iris remains visible between the lids. Joy combines the joy and close shapes for the same reason.
Check each character and a three-quarter view when changing these values; the shapes interact
with each head's sculpt and eyelashes.

In the painted armory, nearby bangs show a softened eyebrow overlay, so the expression survives
hair that otherwise covers the brows. It uses the brow's actual alpha and depth, and is limited
to hair within 4.5 cm, fading at the limit; helmets and other objects still occlude it. A closed
angry mouth can compress its face texture until the frown disappears. For that specific closed
shape the exporter enables the existing traced lip curve, which the viewer attaches to the head
as a fine line; open mouths and neutral do not get that line. The face atlas's mouth window also
gets a small contrast boost to help closed lip marks read.
EOF
python3 -m py_compile tools/export_glb.py && python3 - <<'PY'
from pathlib import Path
import re
p=Path('review/vroid-02/index.html').read_text()
scripts=re.findall(r'<script type="module">(.*?)</script>',p,re.S)
assert len(scripts)==1
Path('/tmp/lowmarch-track-c-armory.mjs').write_text(scripts[0])
recipes=[x for x in Path('art/expressions/armory.txt').read_text().splitlines() if x and not x.startswith('#')]
expected='neutral joy smile angry sad surprised shout wink smug lip_A lip_I lip_U lip_E lip_O'.split()
assert [x.split('|')[0] for x in recipes]==expected
allowed=set(Path('~/Projects/lowmarch-bench/brief/materials/vroid-shapes.txt').read_text().split())
for row in recipes:
 name,shapes=row.split('|')
 if shapes!='none':
  for entry in shapes.split(';'):
   name2,weight=entry.split(':'); assert name2 in allowed; assert float(weight)>0
print('All 14 recipes use known VRoid shape names in the required order.')
PY
node --check /tmp/lowmarch-track-c-armory.mjs && git diff --check && git status --short

result, 9 lines

Script completed
Wall time 0.9 seconds
Output:
All 14 recipes use known VRoid shape names in the required order.
 M docs/portrait-guide.md
 M review/vroid-02/index.html
 M tools/export_glb.py
?? art/expressions/

input

const r=await tools.write_stdin({session_id:21752,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 101
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "101",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 15.8 seconds
Output:
{"chunk_id":"18fa72","wall_time_seconds":50.001097554,"session_id":21752,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:21752,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 102
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "102",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 15.1 seconds
Output:
{"chunk_id":"57107f","wall_time_seconds":50.001778078,"session_id":21752,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:21752,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 103
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "103",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 14.4 seconds
Output:
{"chunk_id":"e43afd","wall_time_seconds":50.001869889,"session_id":21752,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:21752,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 104
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "104",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 15.4 seconds
Output:
{"chunk_id":"214800","wall_time_seconds":50.000499569,"session_id":21752,"original_token_count":0,"output":""}

command

source ~/Projects/lowmarch-bench/kit/env-c.sh && find "$WORK/shot_r5" -name '*.png' | wc -l && date -Is

result, 6 lines

Script completed
Wall time 0.2 seconds
Output:
20
2026-10-30T13:24:38+08:00

input

const r=await tools.write_stdin({session_id:21752,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script running with cell ID 106
Wall time 31.0 seconds
Output:

input

{
  "cell_id": "106",
  "yield_time_ms": 20000
}

result, 4 lines

Script completed
Wall time 16.2 seconds
Output:
{"chunk_id":"2f7bab","wall_time_seconds":50.001410313,"session_id":21752,"original_token_count":0,"output":""}

input

const r=await tools.write_stdin({session_id:21752,chars:"",yield_time_ms:50000,max_output_tokens:2000});text(JSON.stringify(r));

result, 4 lines

Script completed
Wall time 14.2 seconds
Output:
{"chunk_id":"ed59cd","wall_time_seconds":14.176589991,"exit_code":0,"original_token_count":48,"output":"shot r5\n~/Projects/lowmarch-bench/work/c/sheet_r5_woman.png (1968, 1144)\n~/Projects/lowmarch-bench/work/c/sheet_r5_youth.png (1968, 1144)\n2026-10-30T13:25:50+08:00\n"}

input

const results=await Promise.all([
tools.view_image({path:"~/Projects/lowmarch-bench/work/c/sheet_r5_woman.png",detail:"original"}),
tools.view_image({path:"~/Projects/lowmarch-bench/work/c/sheet_r5_youth.png",detail:"original"}),
tools.view_image({path:"~/Projects/lowmarch-bench/work/c/shot_r5/surprised/painted_arm_f_slender.png",detail:"original"})
]);for(const r of results)image(r.image_url);

result, 4 lines

Script completed
Wall time 0.2 seconds
Output: