Track B: Opus 5.5 with a GPT-6.1-Terra reviewer

command

source ~/Projects/lowmarch-bench/kit/env-b.sh && cd $LOWMARCH_REPO && python3 -I - <<'EOF'
p='review/vroid-02/index.html'; s=open(p).read()
def rep(a,b):
    global s
    assert s.count(a)==1,a; s=s.replace(a,b)
rep("vec3 deep = vec3(0.30, 0.10, 0.13), tongue = vec3(0.84, 0.44, 0.47);","vec3 deep = vec3(0.30, 0.10, 0.13), tongue = vec3(0.76, 0.38, 0.42);")
rep("float top = 0.60 + 0.9 * (s - 0.5) * (s - 0.5);","float top = 0.66 + 0.9 * (s - 0.5) * (s - 0.5);")
rep("return mix(col, hc * 0.80, ha && hb ? 0.55 : 0.28);","return mix(col, hc * 0.80, ha && hb ? 0.6 : 0.3);")
open(p,'w').write(s)
EOF
cat > $WORK/expr_list.txt <<'EOF'
# expression recipes: name|VRoid shapes baked at build (Fcl_* names, weight; ';' between; 'none' = neutral)
# the 14 the sheets show; keep these names (front_sheet.py reads them). Edit the recipes freely.
# a key ending @L or @R applies to that side of the face only (tools/vrm.py), for one-sided looks
neutral|none
joy|Fcl_BRW_Joy:1;Fcl_EYE_Joy:1;Fcl_MTH_Joy:1
smile|Fcl_BRW_Fun:1;Fcl_EYE_Fun:0.75;Fcl_MTH_Fun:1
angry|Fcl_BRW_Angry:1.4;Fcl_EYE_Angry:1;Fcl_MTH_Angry:1
sad|Fcl_BRW_Sorrow:1.4;Fcl_EYE_Sorrow:1.3;Fcl_MTH_Sorrow:0.9;Fcl_MTH_Angry:0.4
surprised|Fcl_BRW_Surprised:1.3;Fcl_EYE_Surprised:1.3;Fcl_MTH_O:1.25
shout|Fcl_BRW_Angry:1.6;Fcl_EYE_Angry:0.9;Fcl_MTH_A:1.5;Fcl_MTH_Large:0.5
wink|Fcl_EYE_Close_R:1;Fcl_EYE_Joy_R:0.6;Fcl_BRW_Fun:0.6;Fcl_MTH_Fun:1
smug|Fcl_EYE_Close@L:0.55;Fcl_EYE_Close@R:0.3;Fcl_BRW_Angry@L:0.5;Fcl_BRW_Surprised@R:0.5;Fcl_MTH_Fun:0.4;Fcl_MTH_Fun@R:0.8;Fcl_MTH_Up@R:0.4
lip_A|Fcl_MTH_A:1
lip_I|Fcl_MTH_I:1
lip_U|Fcl_MTH_U:1;Fcl_MTH_O:0.4
lip_E|Fcl_MTH_E:1;Fcl_MTH_I:0.35
lip_O|Fcl_MTH_O:1.2
EOF
time $KIT/build_expr.sh $WORK/expr_list.txt sad surprised shout wink smug lip_U lip_O

result, 11 lines

built sad
built surprised
built shout
built wink
built smug
built lip_U
built lip_O

real	2m10.548s
user	1m41.437s
sys	1m18.954s

command

source ~/Projects/lowmarch-bench/kit/env-b.sh && cat >> $WORK/NOTES.md <<'EOF'
## Round 3 (13:08-13:23, ~15 min)

Changed: one-sided shape keys (`@L`/`@R`) in tools/vrm.py; smug = heavier left lid, lowered left brow, smile on the
right; surprised MTH_O 1.15 + A 0.25; shout A 1.35 + O 0.3; sad MTH_Down; wink EYE_Joy_R + Close_R 0.3; U 1.35;
E + I 0.35; brows over hair tinted 55% / 28% toward the hair.

Sheets: smug now reads as a smirk (tilted mouth, uneven lids). Surprised/shout openings bigger; U overshot and
closed (weight 1.35 folds the lips together); sad mouth dropped too low (MTH_Down moves the whole mouth).

Terra r3 critique (summary): Joy/Smile/Angry clear; smug asymmetric but reads uncertain; sad mouth too low, youth's
nearly flat; surprised eyes near neutral, mouth wide not round; shout like an open smile; U disappears, O narrower than
Before; dark-to-pink split conspicuous; brows still seem to sit on the bangs. Top 3: round U/O; raise and downturn sad
mouth; separate surprised (round, wide eyes) from shout (taller, stronger brows) and keep brows behind the bangs.

Response: U = U 1 + O 0.4; O 1.2; sad drops MTH_Down for Sorrow 0.9 + Angry 0.4 (downturn at the normal height);
surprised eyes 1.3, mouth pure MTH_O 1.25; shout A 1.5 + MTH_Large 0.5, brows 1.6; smug adds both-side smile 0.4 and
a raised right brow (BRW_Surprised@R) for confidence; tongue colour darker and lower (top 0.66) to soften the split;
brow see-through 60%. Rejected: putting brows back behind the bangs (see the eyebrow decision); with these bangs that
hides the main carrier of angry/sad/surprised, which Before shows.

EOF
cd $LOWMARCH_REPO && time $KIT/shoot_expr.sh $LOWMARCH_REPO/review/vroid-02/index.html r4 && $KIT/sheets.sh r4 "Round 4: round U/O, sad mouth, surprise vs shout, smug brow"; date

result, 8 lines

shot r4

real	4m38.558s
user	0m30.794s
sys	0m28.049s
~/Projects/lowmarch-bench/work/b/sheet_r4_woman.png (1968, 1144)
~/Projects/lowmarch-bench/work/b/sheet_r4_youth.png (1968, 1144)
Fri Oct 30 01:30:47 PM PST 2026

input

{
  "file_path": "~/Projects/lowmarch-bench/work/b/sheet_r4_woman.png"
}

result

no output

input

{
  "file_path": "~/Projects/lowmarch-bench/work/b/sheet_r4_youth.png"
}

result

no output

command

source ~/Projects/lowmarch-bench/kit/env-b.sh && $KIT/terra_review.sh r4 $WORK/sheet_r4_woman.png $WORK/sheet_r4_youth.png; date; cd $WORK && python3 -I -c "
from PIL import Image
ims=[Image.open('shot_r4/%s/painted_%s.png'%(e,b)) for b in ('arm_f_slender','arm_m_youth') for e in ('angry','shout','smug','surprised')]
w,h=ims[0].size; out=Image.new('RGB',(4*w//4,2*h//2))
for i,im in enumerate(ims):
    t=im.crop((w//2,30,w,h)).resize((w//4,(h-30)//2)); out.paste(t,((i%4)*w//4,(i//4)*((h-30)//2)))
out.save('$WORK/check30_r4.png')
"

result, 11 lines

exit=0
**Woman:** Joy, Smile, Angry, Shout and the A/I/E mouths read clearly. Shout is more forceful than Before, though its angular mouth and exposed red lower area look pasted on. Surprised reads as alarm or shouting: the raised brows help, but the wide, dark mouth is too similar to Shout. Sad has a clearer frown, although the brows and half-lidded eyes still suggest tiredness. Smug reads mainly as a wink; the asymmetric brow and mouth are too subtle to establish the expression. U and O are distinct, but U is a tiny dot and O is angular rather than round. The Wink has stray lash-like marks below the closed eye. Across the round, dark brow lines sit conspicuously on top of the bangs.

**Youth:** Joy, Smile, Angry, Surprised, Shout and Wink read well. Surprised and Shout now have distinct mouth proportions, though both mouths are sharply polygonal and the red lower fill is prominent. Sad remains close to Neutral: the brows suggest concern, but the mouth is almost flat and the eyes look unchanged. Smug reads through the half-lidded eye, but its mouth is faint. A, I and E read; U is an unnaturally thin vertical slit, while O is slightly too angular. The visible brow lines over the hair are also stronger than Before.

**Three priorities for the next round:**

1. Round and clean up U/O mouths on both bodies. Make U a small, compact oval with enough width to remain legible; give O a larger, smooth rounded opening.
2. Differentiate emotion mouths: narrow the woman’s Surprised mouth, retain Shout’s wider opening, and smooth the angular edges and red lower fills on both bodies.
3. Refine expression lines: strengthen Sad with a gentle downturned mouth and worried brows; give Smug a clearer asymmetric smile, remove the woman’s stray wink lashes, and soften brows where they cross hair.
Fri Oct 30 01:31:08 PM PST 2026

input

{
  "file_path": "~/Projects/lowmarch-bench/work/b/check30_r4.png"
}

result

no output

command

source ~/Projects/lowmarch-bench/kit/env-b.sh && cd $LOWMARCH_REPO && sed -i 's/float top = 0.66 + 0.9 \* (s - 0.5) \* (s - 0.5);/float top = 0.72 + 0.9 * (s - 0.5) * (s - 0.5);/' review/vroid-02/index.html && grep -c 'float top = 0.72' review/vroid-02/index.html && python3 -I - <<'EOF'
import os
p=os.environ['WORK']+'/expr_list.txt'; s=open(p).read()
R={'sad':'sad|Fcl_BRW_Sorrow:1.4;Fcl_EYE_Sorrow:1.3;Fcl_MTH_Sorrow:1;Fcl_MTH_Angry:0.6',
   'surprised':'surprised|Fcl_BRW_Surprised:1.3;Fcl_EYE_Surprised:1.3;Fcl_MTH_O:1;Fcl_MTH_U:0.3',
   'smug':'smug|Fcl_EYE_Close@L:0.45;Fcl_EYE_Close@R:0.35;Fcl_BRW_Angry@L:0.5;Fcl_BRW_Surprised@R:0.5;Fcl_MTH_Fun:0.4;Fcl_MTH_Fun@R:1.2;Fcl_MTH_Up@R:0.6',
   'lip_U':'lip_U|Fcl_MTH_U:0.8;Fcl_MTH_O:0.6',
   'lip_O':'lip_O|Fcl_MTH_O:1.1'}
out=[]
for line in s.splitlines():
    n=line.split('|')[0]
    out.append(R.get(n,line))
open(p,'w').write('\n'.join(out)+'\n')
EOF
cat $WORK/expr_list.txt | tail -14 && time $KIT/build_expr.sh $WORK/expr_list.txt sad surprised smug lip_U lip_O

result, 24 lines

1
neutral|none
joy|Fcl_BRW_Joy:1;Fcl_EYE_Joy:1;Fcl_MTH_Joy:1
smile|Fcl_BRW_Fun:1;Fcl_EYE_Fun:0.75;Fcl_MTH_Fun:1
angry|Fcl_BRW_Angry:1.4;Fcl_EYE_Angry:1;Fcl_MTH_Angry:1
sad|Fcl_BRW_Sorrow:1.4;Fcl_EYE_Sorrow:1.3;Fcl_MTH_Sorrow:1;Fcl_MTH_Angry:0.6
surprised|Fcl_BRW_Surprised:1.3;Fcl_EYE_Surprised:1.3;Fcl_MTH_O:1;Fcl_MTH_U:0.3
shout|Fcl_BRW_Angry:1.6;Fcl_EYE_Angry:0.9;Fcl_MTH_A:1.5;Fcl_MTH_Large:0.5
wink|Fcl_EYE_Close_R:1;Fcl_EYE_Joy_R:0.6;Fcl_BRW_Fun:0.6;Fcl_MTH_Fun:1
smug|Fcl_EYE_Close@L:0.45;Fcl_EYE_Close@R:0.35;Fcl_BRW_Angry@L:0.5;Fcl_BRW_Surprised@R:0.5;Fcl_MTH_Fun:0.4;Fcl_MTH_Fun@R:1.2;Fcl_MTH_Up@R:0.6
lip_A|Fcl_MTH_A:1
lip_I|Fcl_MTH_I:1
lip_U|Fcl_MTH_U:0.8;Fcl_MTH_O:0.6
lip_E|Fcl_MTH_E:1;Fcl_MTH_I:0.35
lip_O|Fcl_MTH_O:1.1
built sad
built surprised
built smug
built lip_U
built lip_O

real	1m11.119s
user	1m12.867s
sys	1m20.207s

command

source ~/Projects/lowmarch-bench/kit/env-b.sh && cat >> $WORK/NOTES.md <<'EOF'
## Round 4 (13:23-13:31, ~8 min)

Changed: U = U 1 + O 0.4; O 1.2; sad = Sorrow 0.9 + MTH_Angry 0.4 (no MTH_Down); surprised eyes 1.3 + pure MTH_O 1.25;
shout A 1.5 + MTH_Large 0.5, brows 1.6; smug + both-side smile and a raised right brow; tongue darker, lower;
brow see-through 60%.

Sheets: woman's sad now a pouty downturn at the right height; shout clearly bigger than A; youth's wink now fully
closed; youth's surprised vs shout separated. Youth's sad mouth still flat; woman's surprised still wide. 30 degree
tiles (angry, shout, smug, surprised on both): brows over the bangs hold their angle off-front and still sit on the
face plane; mouths keep their dark-inside/tongue read.

Terra r4 critique (summary): most read clearly now. Woman surprised too like shout; red lower fills prominent;
mouths angular; sad still tired-looking (youth ~ neutral); smug reads as a wink (woman); U a dot (woman) / slit
(youth); O angular; stray lash marks under the woman's wink; brows conspicuous on the bangs. Top 3: round U/O;
narrow woman's surprised and smooth mouth fills; strengthen sad and smug, clean wink lashes, soften brows over hair.

Response: U = U 0.8 + O 0.6 (wider, rounder); O 1.1; surprised MTH_O 1 + U 0.3 (narrower than shout); tongue smaller
(top 0.72); sad MTH_Sorrow 1 + Angry 0.6; smug lids evened (0.45/0.35, less wink-like) and smile side 1.2 + Up 0.6.
Not acted on: mouth polygon edges (VRoid's mouth hole is a low-poly ring; smoothing needs a drawn mouth outline, out of
scope for the rounds left); the woman's wink lashes (VRoid's closed-eye lash texture; Close_R alone shows the same);
brows over hair (decision kept).

EOF
cd $LOWMARCH_REPO && time $KIT/shoot_expr.sh $LOWMARCH_REPO/review/vroid-02/index.html r5 && $KIT/sheets.sh r5 "Round 5: rounder U, narrower surprise, stronger sad and smug"; date

result, 8 lines

shot r5

real	5m54.966s
user	0m37.821s
sys	0m34.764s
~/Projects/lowmarch-bench/work/b/sheet_r5_woman.png (1968, 1144)
~/Projects/lowmarch-bench/work/b/sheet_r5_youth.png (1968, 1144)
Fri Oct 30 01:38:44 PM PST 2026

input

{
  "file_path": "~/Projects/lowmarch-bench/work/b/sheet_r5_woman.png"
}

result

no output

input

{
  "file_path": "~/Projects/lowmarch-bench/work/b/sheet_r5_youth.png"
}

result

no output

command

source ~/Projects/lowmarch-bench/kit/env-b.sh && $KIT/terra_review.sh r5 $WORK/sheet_r5_woman.png $WORK/sheet_r5_youth.png; date

result, 17 lines

exit=0
Both characters retain their identity and readable blue or amber eyes. The current mouths have more depth, but the dark interiors and red lower accents sometimes look pasted on.

- **Neutral and Smile:** Both read cleanly, though Smile is very subtle and close to Neutral. The new brows are prominent over the bangs.
- **Joy:** Both read as happy through the closed eyes and open mouth. The woman’s mouth is especially clear; the youth’s is slightly small.
- **Angry and Shout:** Both read through the slanted brows, with Shout strengthened by the larger mouth. The brows cut visibly across the hair, and the shout mouths have angular edges.
- **Sad:** The woman’s downturned mouth and worried brows read clearly. The youth’s mouth is so faint that the expression depends almost entirely on the brows.
- **Surprised:** The raised brows help both, but the eyes remain close to neutral. The woman’s small mouth reads more like a quiet “O”; the youth’s narrow opening looks strained.
- **Wink and Smug:** Smug reads better in both thanks to the asymmetrical mouth. The woman’s wink has stray, disconnected lash marks; the youth’s closed eye is a long, thin wedge.
- **Lip sync:** A, I and E are distinguishable. U is very narrow on the youth, while O and A are somewhat similar. The red accent at the bottom of several mouths looks like a separate stripe.

The three most useful next changes:

1. **Refine brow layering:** Mask or soften brows behind the bangs and shorten their ends, while keeping the angry and worried angles.
2. **Rebuild both winks:** Use one continuous, curved closed-lid line with lashes attached; remove the woman’s stray marks and thicken the youth’s outer corner.
3. **Clarify mouth shapes:** Give surprise a rounder opening and wider eyes; make U a small rounded pucker, O taller and rounder, and blend the lower-mouth colour into the interior.
Fri Oct 30 01:39:08 PM PST 2026

command

source ~/Projects/lowmarch-bench/kit/env-b.sh && cd $LOWMARCH_REPO && python3 -I - <<'EOF'
import os
p='review/vroid-02/index.html'; s=open(p).read()
def rep(a,b):
    global s
    assert s.count(a)==1,a; s=s.replace(a,b)
rep("vec3 deep = vec3(0.30, 0.10, 0.13), tongue = vec3(0.76, 0.38, 0.42);","vec3 deep = vec3(0.30, 0.10, 0.13), tongue = vec3(0.70, 0.33, 0.37);")
rep("return t > top ? tongue : deep;","return mix(deep, tongue, smoothstep(top - 0.06, top + 0.06, t));          // soft-topped, not a stripe")
rep("return mix(col, hc * 0.80, ha && hb ? 0.6 : 0.3);","return mix(col, hc * 0.80, ha && hb ? 0.68 : 0.34);")
open(p,'w').write(s)
p=os.environ['WORK']+'/expr_list.txt'; s=open(p).read()
R={'surprised':'surprised|Fcl_BRW_Surprised:1.3;Fcl_EYE_Surprised:1.5;Fcl_MTH_O:1.1;Fcl_MTH_A:0.15',
   'lip_U':'lip_U|Fcl_MTH_U:0.6;Fcl_MTH_O:0.8'}
open(p,'w').write('\n'.join(R.get(l.split('|')[0],l) for l in s.splitlines())+'\n')
EOF
cat >> $WORK/NOTES.md <<'EOF'
## Round 5 (13:31-13:39, ~8 min)

Changed: U = U 0.8 + O 0.6; O 1.1; surprised MTH_O 1 + U 0.3; tongue top 0.72; sad Sorrow 1 + MTH_Angry 0.6; smug lids
0.45/0.35 and the smile side 1.2 + Up 0.6.

Sheets: woman's U is now a small round pucker, smug reads as a smirk on both, woman's sad clear. Youth's U and
surprised went narrow (MTH_U narrows his mouth more than hers); youth's sad mouth still nearly flat.

Terra r5 critique (summary): joy, angry, shout, smug, woman's sad read; smile subtle; surprised eyes near neutral,
youth's opening strained; winks messy (woman stray lashes, youth thin wedge); U narrow on youth; red lower accent
reads as a separate stripe; brows cut across the hair. Top 3: soften/mask brows behind bangs; rebuild winks as one
curved lid line; rounder surprise with wider eyes, rounder U/O, blend the lower-mouth colour.

Response: brows see-through raised to 68% / 34% (the stroke stays, but over hair it reads as seen through the hair);
tongue darker and its top edge a soft blend (no stripe); surprised eyes 1.5, mouth O 1.1 + A 0.15; U = U 0.6 + O 0.8.
Not acted on: winks (the stray marks are VRoid's closed-eye lash texture; a drawn lid line is a renderer feature
bigger than one round), and masking brows behind the bangs (decision kept).

EOF
time $KIT/build_expr.sh $WORK/expr_list.txt surprised lip_U && time $KIT/shoot_expr.sh $LOWMARCH_REPO/review/vroid-02/index.html r6 && $KIT/sheets.sh r6 "Round 6: see-through brows, soft tongue, wider surprise, rounder U"; date

result, 14 lines

built surprised
built lip_U

real	0m36.372s
user	0m30.652s
sys	0m27.911s
shot r6

real	5m59.967s
user	0m35.266s
sys	0m31.546s
~/Projects/lowmarch-bench/work/b/sheet_r6_woman.png (1968, 1144)
~/Projects/lowmarch-bench/work/b/sheet_r6_youth.png (1968, 1144)
Fri Oct 30 01:46:06 PM PST 2026

input

{
  "file_path": "~/Projects/lowmarch-bench/work/b/sheet_r6_woman.png"
}

result

no output

input

{
  "file_path": "~/Projects/lowmarch-bench/work/b/sheet_r6_youth.png"
}

result

no output

command

source ~/Projects/lowmarch-bench/kit/env-b.sh && $KIT/terra_review.sh r6 $WORK/sheet_r6_woman.png $WORK/sheet_r6_youth.png; date

result, 15 lines

exit=0
**The current round improves readability overall**, especially Angry, Surprised and Shout. The darker mouth interiors and restrained tongue colour add depth, though several vowel shapes remain too similar.

For the **woman**, Joy, Angry, Surprised and Shout read clearly: the brows and mouth reinforce each other, and Shout has a convincingly larger opening than Joy. Sad reads, but its tiny, sharply peaked mouth looks more like a worried mark than a natural frown. Smile is gentle but close to Neutral; Smug depends almost entirely on a faint diagonal mouth. Wink has regressed: the closed eye breaks into a short line and scattered lashes, making it look damaged. A and O are very similar horizontal openings, while I is nearly indistinguishable from Neutral.

For the **youth**, Angry, Surprised and Shout read well, with effective brow angles and wider eyes for surprise. Joy reads as a squint more than fully closed, happy eyes. Smile is barely distinct from Neutral, and Smug is subtle but recognizable from the half-lidded eyes. The wink’s long, flat triangular lash is cleaner than Before but looks stiff. U is still a narrow vertical slit, and U and O need clearer separation.

Across both sheets, the visible brows help expressions, but their dark, uninterrupted arcs sometimes appear painted on top of the bangs rather than visible through them.

The three most useful changes for the next round:

1. **Rebuild both winks:** use one smooth, slightly curved closed lid with lashes attached to its outer end; remove the woman’s stray marks and soften the youth’s pointed wedge.
2. **Separate the vowels:** make U a small round opening, O taller and wider, A broader, and I a visibly wider horizontal mouth.
3. **Integrate the brows with the hair:** reduce their contrast over opaque strands and interrupt or tint them where bangs cross, while retaining the expressive angles.
Fri Oct 30 01:46:32 PM PST 2026