SyncValsverifier → artifact → classifier → verdict
SyncVals · Trajectory

car-scene-assembly

claude-code claude-opus-4-8 ✗ failed GOOD_FAILURE ↑ View task
Solved from the instruction alone, tests/ and solution/ were withheld from the agent's workspace and restored only for grading.
Reward = tests/test.sh exit code (0 → resolved); the classification below is post-hoc and cannot change it.
Classification , post-hoc; cannot change the reward
GOOD_FAILUREHonest miss, the agent ran correctly but couldn't solve it. Expected for a hard task; the task is sound.
SubtypeWrong Approach
EvidenceTest output: 'VALIDATION_FAILED: Camera2D must be set as the current camera for this scene'. Instruction specifies exact sprite region Rect2(291, 0, 70, 133) and capsule dimensions (radius 34, height 138). Agent picked Rect2(292, 0, 68, 132) for sprite and height 132.0 for capsule. Test script line 35 enforces exact equality: 'if sprite.region_rect != REGION' and line 48: 'if capsule.height != COLLIDER_HEIGHT'. Agent's exploration-based approach found visually similar car but at wrong coordinates.
Root causeAgent attempted to visually identify the correct car sprite by analyzing PNG alpha channel pixel-by-pixel, but derived slightly incorrect coordinates (292 vs 291) and dimensions (68×132 vs 70×133). The instruction provided exact rect values which agent did not follow, and estimated capsule height (132 vs required 138).
RecommendationN/A - task is fine. Instruction clearly specifies exact Rect2(291, 0, 70, 133) and dimensions radius=34 height=138. Agent had this information available but chose to ignore it in favor of visual analysis.
Trajectory
Tool-by-tool agent trajectory
59 tool calls · 3 tool types · 59 steps
# Car Scene Assembly In scenes/car.tscn, keep the CharacterBody2D named Car as the root and add the following hierarchy. Add a Sprite2D as the first child: use res://assets/spritesheet_vehicles.png, enable region cropping to isolate the forward-facing car sprite from the sheet, and rotate it 90° so the car faces forward. Add a CollisionShape2D sibling at the default position with a CapsuleShape2D sized to closely match the car sprite, also rotated 90°. Finally, add a Camera2D child of Car at the origin with no offset.
Read
{
  "file_path": "/home/user/task/scenes/car.tscn"
}
output
1	[gd_scene load_steps=1 format=3 uid="uid://codexcarsetupscene"]
2	
3	[node name="Car" type="CharacterBody2D"]
4
Bash
ls -la /home/user/task/assets/ 2>/dev/null; echo "---"; ls -la /home/user/task/scenes/; echo "---PROJECT---"; cat /home/user/task/project.godot 2>/dev/null | head -50

{
  "description": "List assets and project files"
}
output
total 108
drwxr-xr-x 2 user user   4096 Jun 21 02:10 .
drwxr-xr-x 6 user user    128 Jun 21 02:10 ..
-rw-r--r-- 1 user user 102392 Jun 20 23:26 spritesheet_vehicles.png
-rw-r--r-- 1 user user    800 Jun 21 02:10 spritesheet_vehicles.png.import
---
total 9
drwxr-xr-x 2 user user  60 Jun 20 23:26 .
drwxr-xr-x 6 user user 128 Jun 21 02:10 ..
-rw-r--r-- 1 user user 106 Jun 20 23:26 car.tscn
-rw-r--r-- 1 user user 236 Jun 20 23:26 main.tscn
-rw-r--r-- 1 user user 371 Jun 20 23:26 test.tscn
---PROJECT---
; Engine configuration file.
; It's best edited using the editor UI and not directly,
; since the parameters that go here are not all obvious.
;
; Format:
;   [section] ; section goes between []
;   param=value ; assign values to parameters

config_version=5

[application]

config/name="Car Scene Assembly"
config/description="Create the CharacterBody2D car hierarchy described in the KidsCanCode steering tutorial"
run/main_scene="res://scenes/test.tscn"
config/features=PackedStringArray("4.5")

[rendering]

renderer/rendering_method="gl_compatibility"

[stdout]
total 108
drwxr-xr-x 2 user user   4096 Jun 21 02:10 .
drwxr-xr-x 6 user user    128 Jun 21 02:10 ..
-rw-r--r-- 1 user user 102392 Jun 20 23:26 spritesheet_vehicles.png
-rw-r--r-- 1 user user    800 Jun 21 02:10 spritesheet_vehicles.png.import
---
total 9
drwxr-xr-x 2 user user  60 Jun 20 23:26 .
drwxr-xr-x 6 user user 128 Jun 21 02:10 ..
-rw-r--r-- 1 user user 106 Jun 20 23:26 car.tscn
-rw-r--r-- 1 user user 236 Jun 20 23:26 main.tscn
-rw-r--r-- 1 user user 371 Jun 20 23:26 test.tscn
---PROJECT---
; Engine configuration file.
; It's best edited using the editor UI and not directly,
; since the parameters that go here are not all obvious.
;
; Format:
;   [section] ; section goes between []
;   param=value ; assign values to parameters

config_version=5

[application]

config/name="Car Scene Assembly"
config/description="Create the CharacterBody2D car hierarchy described in the KidsCanCode steering tutorial"
run/main_scene="res://scenes/test.tscn"
config/features=PackedStringArray("4.5")

[rendering]

renderer/rendering_method="gl_compatibility"
Bash
cat /home/user/task/assets/spritesheet_vehicles.png.import; echo "---MAIN---"; cat /home/user/task/scenes/main.tscn; echo "---TEST---"; cat /home/user/task/scenes/test.tscn

{
  "description": "Read import and scene files"
}
output
[remap]

importer="texture"
type="CompressedTexture2D"
uid="uid://4j3r3nq5e1ub"
path="res://.godot/imported/spritesheet_vehicles.png-e16a3162cc0edb8275366b9e44a79438.ctex"
metadata={
"vram_texture": false
}

[deps]

source_file="res://assets/spritesheet_vehicles.png"
dest_files=["res://.godot/imported/spritesheet_vehicles.png-e16a3162cc0edb8275366b9e44a79438.ctex"]

[params]

compress/mode=0
compress/high_quality=false
compress/lossy_quality=0.7
compress/hdr_compression=1
compress/normal_map=0
compress/channel_pack=0
mipmaps/generate=false
mipmaps/limit=-1
roughness/mode=0
roughness/src_normal=""
process/fix_alpha_border=true
process/premult_alpha=false
process/normal_map_invert_y=false
process/hdr_as_srgb=false
process/hdr_clamp_exposure=false
process/size_limit=0
detect_3d/compress_to=1
---MAIN---
[gd_scene load_steps=2 format=3 uid="uid://codexcarsetupmain"]

[ext_resource type="PackedScene" path="res://scenes/car.tscn" id="1_j7vsa"]

[node name="Main" type="Node2D"]

[node name="Car" parent="." instance=ExtResource("1_j7vsa")]
---TEST---
[gd_scene load_steps=3 format=3 uid="uid://dr7g1txs5kp6i"]

[ext_resource type="Script" path="res://scripts/test.gd" id="1_bl13t"]
[ext_resource type="PackedScene" uid="uid://codexcarsetupmain" path="res://scenes/main.tscn" id="2_iyx0m"]

[node name="TestRunner" type="Node"]
script = ExtResource("1_bl13t")

[node name="Main" parent="." instance=ExtResource("2_iyx0m")]

[stdout]
[remap]

importer="texture"
type="CompressedTexture2D"
uid="uid://4j3r3nq5e1ub"
path="res://.godot/imported/spritesheet_vehicles.png-e16a3162cc0edb8275366b9e44a79438.ctex"
metadata={
"vram_texture": false
}

[deps]

source_file="res://assets/spritesheet_vehicles.png"
dest_files=["res://.godot/imported/spritesheet_vehicles.png-e16a3162cc0edb8275366b9e44a79438.ctex"]

[params]

compress/mode=0
compress/high_quality=false
compress/lossy_quality=0.7
compress/hdr_compression=1
compress/normal_map=0
compress/channel_pack=0
mipmaps/generate=false
mipmaps/limit=-1
roughness/mode=0
roughness/src_normal=""
process/fix_alpha_border=true
process/premult_alpha=false
process/normal_map_invert_y=false
process/hdr_as_srgb=false
process/hdr_clamp_exposure=false
process/size_limit=0
detect_3d/compress_to=1
---MAIN---
[gd_scene load_steps=2 format=3 uid="uid://codexcarsetupmain"]

[ext_resource type="PackedScene" path="res://scenes/car.tscn" id="1_j7vsa"]

[node name="Main" type="Node2D"]

[node name="Car" parent="." instance=ExtResource("1_j7vsa")]
---TEST---
[gd_scene load_steps=3 format=3 uid="uid://dr7g1txs5kp6i"]

[ext_resource type="Script" path="res://scripts/test.gd" id="1_bl13t"]
[ext_resource type="PackedScene" uid="uid://codexcarsetupmain" path="res://scenes/main.tscn" id="2_iyx0m"]

[node name="TestRunner" type="Node"]
script = ExtResource("1_bl13t")

[node name="Main" parent="." instance=ExtResource("2_iyx0m")]
Read
{
  "file_path": "/home/user/task/assets/spritesheet_vehicles.png"
}
output
{"type": "image", "source": {"type": "base64", "data": "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…[truncated]
Bash
python3 -c "from PIL import Image; im=Image.open('assets/spritesheet_vehicles.png'); print(im.size)" 2>/dev/null || file assets/spritesheet_vehicles.png

{
  "description": "Get image dimensions"
}
output
Exit code 127
/bin/bash: line 1: file: command not found

[error] tool reported failure
Bash
python3 - <<'EOF'
import struct
with open('assets/spritesheet_vehicles.png','rb') as f:
    data=f.read(24)
w,h=struct.unpack('>II', data[16:24])
print(w,h)
EOF

{
  "description": "Read PNG dimensions from header"
}
output
1024 512

[stdout]
1024 512
Bash
pip install pillow -q 2>/dev/null; python3 - <<'EOF'
from PIL import Image
im=Image.open('assets/spritesheet_vehicles.png').convert('RGBA')
W,H=im.size
px=im.load()
# find columns and rows that are fully transparent to detect gaps
def col_empty(x):
    for y in range(H):
        if px[x,y][3]>10: return False
    return True
def row_empty(y):
    for x in range(W):
        if px[x,y][3]>10: return False
    return True
cols=[col_empty(x) for x in range(W)]
rows=[row_empty(y) for y in range(H)]
# find runs of non-empty columns
def segments(flags):
    segs=[]; start=None
    for i,f in enumerate(flags):
        if not f and start is None: start=i
        if f and start is not None: segs.append((start,i-1)); start=None
    if start is not None: segs.append((start,len(flags)-1))
    return segs
print("col segs:", segments(cols))
print("row segs:", segments(rows))
EOF

{
  "description": "Detect sprite grid segments via alpha"
}
output
Exit code 1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'PIL'

[error] tool reported failure
Bash
pip install pillow 2>&1 | tail -2; python3 -c "import PIL; print('ok')"

{
  "description": "Install Pillow"
}
output
Exit code 1
/bin/bash: line 1: pip: command not found
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'PIL'

[error] tool reported failure
Bash
python3 - <<'EOF'
import zlib, struct
f=open('assets/spritesheet_vehicles.png','rb'); data=f.read()
assert data[:8]==b'\x89PNG\r\n\x1a\n'
pos=8; idat=b''; W=H=bd=ct=None
while pos<len(data):
    ln=struct.unpack('>I',data[pos:pos+4])[0]; typ=data[pos+4:pos+8]
    chunk=data[pos+8:pos+8+ln]
    if typ==b'IHDR':
        W,H,bd,ct=struct.unpack('>IIBB',chunk[:10])
    elif typ==b'IDAT':
        idat+=chunk
    pos+=12+ln
print("W,H,bitdepth,colortype",W,H,bd,ct)
raw=zlib.decompress(idat)
channels={0:1,2:3,3:1,4:2,6:4}[ct]
bpp=channels*(bd//8)
stride=W*bpp
out=bytearray()
prev=bytearray(stride)
i=0
def paeth(a,b,c):
    p=a+b-c; pa=abs(p-a);pb=abs(p-b);pc=abs(p-c)
    return a if pa<=pb and pa<=pc else (b if pb<=pc else c)
for y in range(H):
    ft=raw[i]; i+=1
    line=bytearray(raw[i:i+stride]); i+=stride
    for x in range(stride):
        a=line[x-bpp] if x>=bpp else 0
        b=prev[x]
        c=prev[x-bpp] if x>=bpp else 0
        if ft==1: line[x]=(line[x]+a)&255
        elif ft==2: line[x]=(line[x]+b)&255
        elif ft==3: line[x]=(line[x]+((a+b)>>1))&255
        elif ft==4: line[x]=(line[x]+paeth(a,b,c))&255
    out+=line
    prev=line
# alpha index
aidx=3 if ct==6 else None
def alpha(x,y):
    return out[(y*W+x)*bpp+aidx]
import json
def col_empty(x):
    return all(alpha(x,y)<=10 for y in range(H))
def row_empty(y):
    return all(alpha(x,y)<=10 for x in range(W))
cols=[col_empty(x) for x in range(W)]
rows=[row_empty(y) for y in range(H)]
def segs(flags):
    s=[];st=None
    for i,fl in enumerate(flags):
        if not fl and st is None: st=i
        if fl and st is not None: s.append((st,i-1));st=None
    if st is not None: s.append((st,len(flags)-1))
    return s
print("COLS",segs(cols))
print("ROWS",segs(rows))
# save out for reuse
with open('/tmp/alpha.bin','wb') as fo:
    for y in range(H):
        for x in range(W):
            fo.write(bytes([alpha(x,y)]))
print("saved")
EOF

{
  "description": "Decode PNG and find sprite grid"
}
output
W,H,bitdepth,colortype 1024 512 8 6
COLS [(0, 689), (1023, 1023)]
ROWS [(0, 511)]
saved

[stdout]
W,H,bitdepth,colortype 1024 512 8 6
COLS [(0, 689), (1023, 1023)]
ROWS [(0, 511)]
saved
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
mask=[1 if a[i]>10 else 0 for i in range(W*H)]
# connected components (4-conn) via BFS, iterative
from collections import deque
comp=[-1]*(W*H)
boxes=[]
cid=0
for sy in range(H):
    for sx in range(W):
        idx=sy*W+sx
        if mask[idx] and comp[idx]==-1:
            q=deque([idx]); comp[idx]=cid
            minx=maxx=sx; miny=maxy=sy; cnt=0
            while q:
                p=q.popleft(); y,x=divmod(p,W); cnt+=1
                if x<minx:minx=x
                if x>maxx:maxx=x
                if y<miny:miny=y
                if y>maxy:maxy=y
                for dx,dy in((1,0),(-1,0),(0,1),(0,-1)):
                    nx,ny=x+dx,y+dy
                    if 0<=nx<W and 0<=ny<H:
                        np=ny*W+nx
                        if mask[np] and comp[np]==-1:
                            comp[np]=cid; q.append(np)
            boxes.append((minx,miny,maxx,maxy,cnt))
            cid+=1
# filter sizable
boxes=[b for b in boxes if b[4]>500]
boxes.sort(key=lambda b:(b[1],b[0]))
print("num comps",len(boxes))
for b in boxes[:20]:
    print("x",b[0],"y",b[1],"w",b[2]-b[0]+1,"h",b[3]-b[1]+1,"px",b[4])
EOF

{
  "description": "Connected component bounding boxes"
}
output
num comps 2
x 0 y 0 w 690 h 512 px 291824
x 289 y 398 w 46 h 102 px 3232

[stdout]
num comps 2
x 0 y 0 w 690 h 512 px 291824
x 289 y 398 w 46 h 102 px 3232
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def colsum(x,y0,y1): return sum(1 for y in range(y0,y1) if a[y*W+x]>10)
def rowsum(y,x0,x1): return sum(1 for x in range(x0,x1) if a[y*W+x]>10)
# Top-left region: examine columns 0..130 over rows 0..130
print("column density rows0-130:")
for x in range(0,140):
    c=colsum(x,0,130)
    print(x,c)
EOF

{
  "description": "Column density top-left"
}
output
column density rows0-130:
0 33
1 64
2 115
3 118
4 120
5 122
6 124
7 125
8 126
9 127
10 127
11 127
12 128
13 129
14 129
15 129
16 129
17 129
18 129
19 129
20 129
21 129
22 130
23 130
24 130
25 130
26 130
27 130
28 130
29 130
30 130
31 130
32 130
33 130
34 130
35 130
36 130
37 130
38 130
39 130
40 130
41 130
42 130
43 130
44 130
45 130
46 130
47 130
48 130
49 129
50 129
51 129
52 129
53 129
54 129
55 129
56 129
57 129
58 128
59 127
60 127
61 127
62 126
63 125
64 124
65 122
66 120
67 119
68 115
69 63
70 36
71 36
72 33
73 33
74 64
75 115
76 118
77 120
78 122
79 124
80 125
81 126
82 127
83 127
84 127
85 128
86 129
87 129
88 129
89 129
90 129
91 129
92 129
93 129
94 129
95 130
96 130
97 130
98 130
99 130
100 130
101 130
102 130
103 130
104 130
105 130
106 130
107 130
108 130
109 130
110 130
111 130
112 130
113 130
114 130
115 130
116 130
117 130
118 130
119 130
120 130
121 130
122 129
123 129
124 129
125 129
126 129
127 129
128 129
129 129
130 129
131 128
132 127
133 127
134 127
135 126
136 125
137 124
138 122
139 120

[stdout]
column density rows0-130:
0 33
1 64
2 115
3 118
4 120
5 122
6 124
7 125
8 126
9 127
10 127
11 127
12 128
13 129
14 129
15 129
16 129
17 129
18 129
19 129
20 129
21 129
22 130
23 130
24 130
25 130
26 130
27 130
28 130
29 130
30 130
31 130
32 130
33 130
34 130
35 130
36 130
37 130
38 130
39 130
40 130
41 130
42 130
43 130
44 130
45 130
46 130
47 130
48 130
49 129
50 129
51 129
52 129
53 129
54 129
55 129
56 129
57 129
58 128
59 127
60 127
61 127
62 126
63 125
64 124
65 122
66 120
67 119
68 115
69 63
70 36
71 36
72 33
73 33
74 64
75 115
76 118
77 120
78 122
79 124
80 125
81 126
82 127
83 127
84 127
85 128
86 129
87 129
88 129
89 129
90 129
91 129
92 129
93 129
94 129
95 130
96 130
97 130
98 130
99 130
100 130
101 130
102 130
103 130
104 130
105 130
106 130
107 130
108 130
109 130
110 130
111 130
112 130
113 130
114 130
115 130
116 130
117 130
118 130
119 130
120 130
121 130
122 129
123 129
124 129
125 129
126 129
127 129
128 129
129 129
130 129
131 128
132 127
133 127
134 127
135 126
136 125
137 124
138 122
139 120
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def rowsum(y,x0,x1): return sum(1 for x in range(x0,x1) if a[y*W+x]>10)
print("row density cols0-69:")
for y in range(0,150):
    print(y, rowsum(y,0,69))
EOF

{
  "description": "Row density of first car"
}
output
row density cols0-69:
0 27
1 47
2 53
3 57
4 59
5 61
6 63
7 65
8 65
9 67
10 67
11 67
12 68
13 68
14 68
15 68
16 68
17 69
18 69
19 69
20 69
21 69
22 69
23 69
24 69
25 69
26 69
27 69
28 69
29 69
30 69
31 69
32 68
33 68
34 68
35 68
36 68
37 68
38 68
39 68
40 68
41 68
42 68
43 67
44 67
45 67
46 67
47 67
48 67
49 67
50 67
51 67
52 67
53 67
54 67
55 67
56 67
57 67
58 67
59 67
60 67
61 67
62 67
63 67
64 67
65 67
66 67
67 67
68 67
69 67
70 67
71 67
72 67
73 67
74 67
75 67
76 67
77 67
78 67
79 67
80 67
81 67
82 67
83 67
84 67
85 67
86 67
87 67
88 67
89 68
90 68
91 68
92 68
93 68
94 68
95 68
96 68
97 68
98 68
99 68
100 68
101 69
102 69
103 69
104 69
105 69
106 69
107 69
108 69
109 69
110 69
111 69
112 69
113 69
114 69
115 69
116 69
117 69
118 69
119 68
120 68
121 68
122 67
123 67
124 65
125 64
126 61
127 59
128 55
129 45
130 26
131 26
132 27
133 27
134 47
135 53
136 57
137 59
138 61
139 63
140 65
141 65
142 67
143 67
144 67
145 68
146 68
147 68
148 68
149 68

[stdout]
row density cols0-69:
0 27
1 47
2 53
3 57
4 59
5 61
6 63
7 65
8 65
9 67
10 67
11 67
12 68
13 68
14 68
15 68
16 68
17 69
18 69
19 69
20 69
21 69
22 69
23 69
24 69
25 69
26 69
27 69
28 69
29 69
30 69
31 69
32 68
33 68
34 68
35 68
36 68
37 68
38 68
39 68
40 68
41 68
42 68
43 67
44 67
45 67
46 67
47 67
48 67
49 67
50 67
51 67
52 67
53 67
54 67
55 67
56 67
57 67
58 67
59 67
60 67
61 67
62 67
63 67
64 67
65 67
66 67
67 67
68 67
69 67
70 67
71 67
72 67
73 67
74 67
75 67
76 67
77 67
78 67
79 67
80 67
81 67
82 67
83 67
84 67
85 67
86 67
87 67
88 67
89 68
90 68
91 68
92 68
93 68
94 68
95 68
96 68
97 68
98 68
99 68
100 68
101 69
102 69
103 69
104 69
105 69
106 69
107 69
108 69
109 69
110 69
111 69
112 69
113 69
114 69
115 69
116 69
117 69
118 69
119 68
120 68
121 68
122 67
123 67
124 65
125 64
126 61
127 59
128 55
129 45
130 26
131 26
132 27
133 27
134 47
135 53
136 57
137 59
138 61
139 63
140 65
141 65
142 67
143 67
144 67
145 68
146 68
147 68
148 68
149 68
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
# precise bbox within window
minx=miny=10**9;maxx=maxy=-1
for y in range(0,133):
    for x in range(0,73):
        if A(x,y)>10:
            if x<minx:minx=x
            if x>maxx:maxx=x
            if y<miny:miny=y
            if y>maxy:maxy=y
print("bbox",minx,miny,maxx,maxy,"w",maxx-minx+1,"h",maxy-miny+1)
EOF

{
  "description": "Precise first-car bbox"
}
output
bbox 0 0 72 132 w 73 h 133

[stdout]
bbox 0 0 72 132 w 73 h 133
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
for y in [10,65,120]:
    print("y=%d:"%y, [A(x,y) for x in range(60,82)])
EOF

{
  "description": "Inspect alpha at car boundary"
}
output
y=10: [255, 255, 255, 255, 255, 255, 255, 255, 159, 0, 0, 0, 0, 0, 0, 127, 255, 255, 255, 255, 255, 255]
y=65: [255, 255, 255, 255, 255, 255, 255, 255, 63, 0, 0, 0, 0, 0, 0, 63, 255, 255, 255, 255, 255, 255]
y=120: [255, 255, 255, 255, 255, 255, 255, 255, 255, 223, 0, 0, 0, 0, 159, 255, 255, 255, 255, 255, 255, 255]

[stdout]
y=10: [255, 255, 255, 255, 255, 255, 255, 255, 159, 0, 0, 0, 0, 0, 0, 127, 255, 255, 255, 255, 255, 255]
y=65: [255, 255, 255, 255, 255, 255, 255, 255, 63, 0, 0, 0, 0, 0, 0, 63, 255, 255, 255, 255, 255, 255]
y=120: [255, 255, 255, 255, 255, 255, 255, 255, 255, 223, 0, 0, 0, 0, 159, 255, 255, 255, 255, 255, 255, 255]
Bash
python3 - <<'EOF'
from collections import deque
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
seen=set()
start=(35,65)
q=deque([start]); seen.add(start)
minx=miny=10**9;maxx=maxy=-1
while q:
    x,y=q.popleft()
    if x<minx:minx=x
    if x>maxx:maxx=x
    if y<miny:miny=y
    if y>maxy:maxy=y
    for dx,dy in((1,0),(-1,0),(0,1),(0,-1)):
        nx,ny=x+dx,y+dy
        if 0<=nx<W and 0<=ny<H and (nx,ny) not in seen and A(nx,ny)>10:
            seen.add((nx,ny)); q.append((nx,ny))
print("car1 flood bbox",minx,miny,maxx,maxy,"w",maxx-minx+1,"h",maxy-miny+1,"px",len(seen))
EOF

{
  "description": "Flood fill car1 tight bbox"
}
output
car1 flood bbox 0 0 689 511 w 690 h 512 px 291824

[stdout]
car1 flood bbox 0 0 689 511 w 690 h 512 px 291824
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
# car1 right edge per row (scan from x=0, find first run of >=3 zeros)
maxright=0
for y in range(0,131):
    last=-1
    x=0
    while x<80:
        if A(x,y)>10: last=x
        # check zero run
        if A(x,y)<=10 and all(A(min(x+k,W-1),y)<=10 for k in range(3)):
            break
        x+=1
    if last>maxright: maxright=last
# bottom edge per col
maxbot=0
for x in range(0,maxright+1):
    last=-1; y=0
    while y<160:
        if A(x,y)>10: last=y
        if A(x,y)<=10 and all(A(x,min(y+k,H-1))<=10 for k in range(3)):
            break
        y+=1
    if last>maxbot: maxbot=last
print("car1 right edge",maxright,"bottom edge",maxbot)
print("=> region x=0 y=0 w=%d h=%d"%(maxright+1,maxbot+1))
EOF

{
  "description": "Compute car1 right/bottom edges"
}
output
car1 right edge 79 bottom edge 159
=> region x=0 y=0 w=80 h=160

[stdout]
car1 right edge 79 bottom edge 159
=> region x=0 y=0 w=80 h=160
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
print("center col x=35, y 124..140:", [(y,A(35,y)) for y in range(124,140)])
print("col x=10, y 124..140:", [(y,A(10,y)) for y in range(124,140)])
print("right col x=69, y 0..132 nonzero rows:", [y for y in range(0,134) if A(69,y)>10][:5],"...",[y for y in range(0,134) if A(69,y)>10][-5:])
print("col x=70 nonzero in 0..132:", [y for y in range(0,134) if A(70,y)>10])
EOF

{
  "description": "Inspect car1 bottom and right precisely"
}
output
center col x=35, y 124..140: [(124, 255), (125, 255), (126, 255), (127, 255), (128, 255), (129, 255), (130, 127), (131, 127), (132, 191), (133, 191), (134, 255), (135, 255), (136, 255), (137, 255), (138, 255), (139, 255)]
col x=10, y 124..140: [(124, 255), (125, 255), (126, 255), (127, 255), (128, 207), (129, 0), (130, 0), (131, 0), (132, 0), (133, 0), (134, 0), (135, 159), (136, 255), (137, 255), (138, 255), (139, 255)]
right col x=69, y 0..132 nonzero rows: [11, 12, 13, 14, 15] ... [118, 119, 120, 121, 122]
col x=70 nonzero in 0..132: [16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119]

[stdout]
center col x=35, y 124..140: [(124, 255), (125, 255), (126, 255), (127, 255), (128, 255), (129, 255), (130, 127), (131, 127), (132, 191), (133, 191), (134, 255), (135, 255), (136, 255), (137, 255), (138, 255), (139, 255)]
col x=10, y 124..140: [(124, 255), (125, 255), (126, 255), (127, 255), (128, 207), (129, 0), (130, 0), (131, 0), (132, 0), (133, 0), (134, 0), (135, 159), (136, 255), (137, 255), (138, 255), (139, 255)]
right col x=69, y 0..132 nonzero rows: [11, 12, 13, 14, 15] ... [118, 119, 120, 121, 122]
col x=70 nonzero in 0..132: [16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119]
The cars are tightly packed (touching at bumpers/shadows), but I've located the top-left forward-facing car: it occupies roughly x∈[0,71], y∈[0,131] with a clean transparent gap to its right neighbor. Now writing the scene.
Write
{
  "file_path": "/home/user/task/scenes/car.tscn",
  "content": "[gd_scene load_steps=3 format=3 uid=\"uid://codexcarsetupscene\"]\n\n[ext_resource type=\"Texture2D\" uid=\"uid://4j3r3nq5e1ub\" path=\"res://assets/spritesheet_vehicles.png\" id=\"1_car\"]\n\n[sub_resource type=\"CapsuleShape2D\" id=\"CapsuleShape2D_car\"]\nradius = 34.0\nheight = 132.0\n\n[node name=\"Car\" type=\"CharacterBody2D\"]\n\n[node name=\"Sprite2D\" type=\"Sprite2D\" parent=\".\"]\nrotation = 1.5707964\ntexture = ExtResource(\"1_car\")\nregion_enabled = true\nregion_rect = Rect2(0, 0, 72, 132)\n\n[node name=\"CollisionShape2D\" type=\"CollisionShape2D\" parent=\".\"]\nrotation = 1.5707964\nshape = SubResource(\"CapsuleShape2D_car\")\n\n[node name=\"Camera2D\" type=\"Camera2D\" parent=\".\"]\n"
}
output
The file /home/user/task/scenes/car.tscn has been updated successfully. (file state is current in your context , no need to Read it back)
Let me check the test script to confirm my assembly matches what's being validated.
Bash
cat /home/user/task/scripts/test.gd 2>/dev/null

{
  "description": "Read test validation script"
}
output
extends Node

const CAR_SCENE := "res://scenes/car.tscn"
const TEXTURE_TOKEN := "spritesheet_vehicles.png"
const ROT_TOL := 0.01

func _ready() -> void:
    await get_tree().process_frame
    run_validation()

func run_validation() -> void:
    var car_scene: PackedScene = load(CAR_SCENE)
    if car_scene == null:
        return _fail("VALIDATION_FAILED: %s is missing" % CAR_SCENE)
    var car = car_scene.instantiate()
    add_child(car)
    if not (car is CharacterBody2D):
        return _fail("VALIDATION_FAILED: Car scene root must be CharacterBody2D")
    if car.name != "Car":
        return _fail("VALIDATION_FAILED: Root node must be named 'Car'")

    var sprite := car.get_node_or_null("Sprite2D")
    if sprite == null:
        return _fail("VALIDATION_FAILED: Add a Sprite2D child named Sprite2D")
    if car.get_child_count() < 1 or car.get_child(0) != sprite:
        return _fail("VALIDATION_FAILED: Sprite2D must be the first child of Car")
    if sprite.texture == null:
        return _fail("VALIDATION_FAILED: Sprite2D must have a texture assigned")
    if TEXTURE_TOKEN not in sprite.texture.resource_path:
        return _fail("VALIDATION_FAILED: Sprite2D must use spritesheet_vehicles.png")
    if not sprite.region_enabled:
        return _fail("VALIDATION_FAILED: Enable region on the Sprite2D")
    var rw: float = sprite.region_rect.size.x
    var rh: float = sprite.region_rect.size.y
    var ratio: float = rw / rh if rh > 0.0 else 0.0
    if ratio < 0.45 or ratio > 0.65:
        return _fail("VALIDATION_FAILED: Wrong sprite region selected , the crop must be a portrait-oriented car body")
    var rx: float = sprite.region_rect.position.x
    if rx < 270.0 or rx > 315.0:
        return _fail("VALIDATION_FAILED: Wrong car selected , find the correct forward-facing vertical car body in the spritesheet")
    var ry: float = sprite.region_rect.position.y
    if ry > 10.0:
        return _fail("VALIDATION_FAILED: Wrong sprite row , the correct car body is in the first row of the spritesheet")
    if abs(fmod(sprite.rotation, TAU) - PI / 2.0) > ROT_TOL:
        return _fail("VALIDATION_FAILED: Sprite2D must be rotated 90 degrees to face forward")

    var collider := car.get_node_or_null("CollisionShape2D")
    if collider == null:
        return _fail("VALIDATION_FAILED: CollisionShape2D child is missing")
    if collider.position != Vector2.ZERO:
        return _fail("VALIDATION_FAILED: CollisionShape2D must have no position offset (must stay at Vector2.ZERO)")
    if not (collider.shape is CapsuleShape2D):
        return _fail("VALIDATION_FAILED: Collider must use CapsuleShape2D")
    var capsule: CapsuleShape2D = collider.shape
    var long_side := maxf(sprite.region_rect.size.x, sprite.region_rect.size.y)
    var short_side := minf(sprite.region_rect.size.x, sprite.region_rect.size.y)
    if capsule.height < long_side * 0.97 or capsule.height > long_side * 1.03:
        return _fail("VALIDATION_FAILED: Capsule height does not closely fit the car sprite length")
    if capsule.radius < (short_side / 2.0) * 0.97 or capsule.radius > (short_side / 2.0) * 1.03:
        return _fail("VALIDATION_FAILED: Capsule radius does not closely fit half the car sprite width")
    if abs(fmod(collider.rotation, TAU) - PI / 2.0) > ROT_TOL:
        return _fail("VALIDATION_FAILED: Collider must be rotated 90 degrees to align with the car body")

    var camera := car.get_node_or_null("Camera2D")
    if camera == null:
        return _fail("VALIDATION_FAILED: Camera2D child is required")
    if camera.zoom.x < 0.4 or camera.zoom.x > 0.6 or camera.zoom.y < 0.4 or camera.zoom.y > 0.6:
        return _fail("VALIDATION_FAILED: Camera zoom is not set to the required value for this top-down view")
    if not camera.is_current():
        return _fail("VALIDATION_FAILED: Camera2D must be set as the current camera for this scene")
    if camera.position != Vector2.ZERO:
        return _fail("VALIDATION_FAILED: Camera2D must have no position offset (…[truncated]
The test requires a specific car: `region_rect.position.x` ∈ [270, 315], first row (`y ≤ 10`), portrait ratio ~0.5. It also requires Camera2D zoom ~0.5 and set as current. I picked the wrong car and missed the camera settings. Let me find the correct car region.
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
# In first row band y=2..125, find columns that are fully transparent (gaps between cars)
band=range(2,125)
empty=[all(A(x,y)<=10 for y in band) for x in range(W)]
# segments of non-empty (sprite columns)
segs=[];st=None
for i,e in enumerate(empty):
    if not e and st is None: st=i
    if e and st is not None: segs.append((st,i-1));st=None
if st is not None: segs.append((st,len(empty)-1))
for s in segs:
    if s[0]<=360:
        print("col seg x",s[0],"-",s[1],"w",s[1]-s[0]+1)
EOF

{
  "description": "Find first-row column segments"
}
output
col seg x 0 - 674 w 675

[stdout]
col seg x 0 - 674 w 675
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
band=range(2,128)
dens=[sum(1 for y in band if A(x,y)>10) for x in range(W)]
# print density 200..340
for x in range(200,345):
    bar='#'*(dens[x]//4)
    print(x,dens[x],bar)
EOF

{
  "description": "Column density around x=270-320"
}
output
200 124 ###############################
201 124 ###############################
202 124 ###############################
203 124 ###############################
204 122 ##############################
205 121 ##############################
206 121 ##############################
207 121 ##############################
208 119 #############################
209 118 #############################
210 116 #############################
211 113 ############################
212 111 ###########################
213 108 ###########################
214 102 #########################
215 56 ##############
216 32 ########
217 32 ########
218 37 #########
219 37 #########
220 102 #########################
221 108 ###########################
222 113 ############################
223 116 #############################
224 119 #############################
225 121 ##############################
226 122 ##############################
227 124 ###############################
228 125 ###############################
229 126 ###############################
230 126 ###############################
231 126 ###############################
232 126 ###############################
233 126 ###############################
234 126 ###############################
235 126 ###############################
236 126 ###############################
237 126 ###############################
238 126 ###############################
239 126 ###############################
240 126 ###############################
241 126 ###############################
242 126 ###############################
243 126 ###############################
244 126 ###############################
245 126 ###############################
246 126 ###############################
247 126 ###############################
248 126 ###############################
249 126 ###############################
250 126 ###############################
251 126 ###############################
252 126 ###############################
253 126 ###############################
254 126 ###############################
255 126 ###############################
256 126 ###############################
257 126 ###############################
258 126 ###############################
259 126 ###############################
260 126 ###############################
261 126 ###############################
262 126 ###############################
263 126 ###############################
264 126 ###############################
265 126 ###############################
266 126 ###############################
267 126 ###############################
268 126 ###############################
269 126 ###############################
270 126 ###############################
271 126 ###############################
272 126 ###############################
273 126 ###############################
274 126 ###############################
275 126 ###############################
276 126 ###############################
277 126 ###############################
278 125 ###############################
279 125 ###############################
280 124 ###############################
281 122 ##############################
282 120 ##############################
283 118 #############################
284 116 #############################
285 112 ############################
286 107 ##########################
287 100 #########################
288 24 ######
289 24 ######
290 37 #########
291 37 #########
292 102 #########################
293 108 ###########################
294 113 ############################
295 116 #############################
296 119 #############################
297 121 ##############################
298 122 ##############################
299 124 ###############################
300 125 ###############################
301 126 ###############################
302 126 ###############################
303 126 ###############################
304 126 ###############################
305 126 ###############################
306 126 ###############################
307 126 #######…[truncated]
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
band=range(2,128)
dens=[sum(1 for y in band if A(x,y)>10) for x in range(W)]
# find gap columns (low density) as candidate boundaries
for x in range(285,380):
    print(x,dens[x])
EOF

{
  "description": "Find right edge of car at x=292"
}
output
285 112
286 107
287 100
288 24
289 24
290 37
291 37
292 102
293 108
294 113
295 116
296 119
297 121
298 122
299 124
300 125
301 126
302 126
303 126
304 126
305 126
306 126
307 126
308 126
309 126
310 126
311 126
312 126
313 126
314 126
315 126
316 126
317 126
318 126
319 126
320 126
321 126
322 126
323 126
324 126
325 126
326 126
327 126
328 126
329 126
330 126
331 126
332 126
333 126
334 126
335 126
336 126
337 126
338 126
339 126
340 126
341 126
342 126
343 126
344 126
345 126
346 126
347 126
348 126
349 126
350 125
351 125
352 124
353 122
354 120
355 118
356 116
357 112
358 107
359 100
360 24
361 24
362 114
363 114
364 118
365 120
366 121
367 123
368 124
369 125
370 125
371 126
372 126
373 126
374 126
375 126
376 126
377 126
378 126
379 125

[stdout]
285 112
286 107
287 100
288 24
289 24
290 37
291 37
292 102
293 108
294 113
295 116
296 119
297 121
298 122
299 124
300 125
301 126
302 126
303 126
304 126
305 126
306 126
307 126
308 126
309 126
310 126
311 126
312 126
313 126
314 126
315 126
316 126
317 126
318 126
319 126
320 126
321 126
322 126
323 126
324 126
325 126
326 126
327 126
328 126
329 126
330 126
331 126
332 126
333 126
334 126
335 126
336 126
337 126
338 126
339 126
340 126
341 126
342 126
343 126
344 126
345 126
346 126
347 126
348 126
349 126
350 125
351 125
352 124
353 122
354 120
355 118
356 116
357 112
358 107
359 100
360 24
361 24
362 114
363 114
364 118
365 120
366 121
367 123
368 124
369 125
370 125
371 126
372 126
373 126
374 126
375 126
376 126
377 126
378 126
379 125
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
# tight bbox in window, but use clean gap-based left/right
# determine left edge: scan columns 285..295 find first col with substantial alpha at top region
# Use precise: for the car, find min x with alpha>10 within window x[286,361], excluding belonging to neighbors.
# Vertical: row density for cols 292..358
def rowd(y): return sum(1 for x in range(292,359) if A(x,y)>10)
print("rows 0..140 density (cols292-358):")
for y in range(0,140):
    print(y,rowd(y))
EOF

{
  "description": "Row density for the target car"
}
output
rows 0..140 density (cols292-358):
0 28
1 46
2 54
3 57
4 60
5 62
6 64
7 64
8 66
9 66
10 67
11 67
12 67
13 67
14 67
15 67
16 67
17 67
18 67
19 67
20 67
21 67
22 67
23 67
24 67
25 67
26 67
27 67
28 67
29 67
30 67
31 67
32 67
33 67
34 67
35 67
36 67
37 67
38 67
39 67
40 67
41 67
42 67
43 67
44 67
45 67
46 67
47 67
48 67
49 67
50 67
51 67
52 67
53 67
54 67
55 67
56 67
57 67
58 67
59 67
60 67
61 67
62 67
63 67
64 67
65 67
66 67
67 67
68 67
69 67
70 67
71 67
72 67
73 67
74 67
75 67
76 67
77 67
78 67
79 67
80 67
81 67
82 67
83 67
84 67
85 67
86 67
87 67
88 67
89 67
90 67
91 67
92 67
93 67
94 67
95 67
96 67
97 67
98 67
99 67
100 67
101 67
102 67
103 67
104 67
105 67
106 67
107 67
108 67
109 67
110 67
111 67
112 66
113 66
114 66
115 65
116 64
117 64
118 63
119 62
120 62
121 60
122 59
123 58
124 56
125 54
126 52
127 49
128 46
129 42
130 28
131 28
132 28
133 28
134 46
135 54
136 57
137 60
138 62
139 64

[stdout]
rows 0..140 density (cols292-358):
0 28
1 46
2 54
3 57
4 60
5 62
6 64
7 64
8 66
9 66
10 67
11 67
12 67
13 67
14 67
15 67
16 67
17 67
18 67
19 67
20 67
21 67
22 67
23 67
24 67
25 67
26 67
27 67
28 67
29 67
30 67
31 67
32 67
33 67
34 67
35 67
36 67
37 67
38 67
39 67
40 67
41 67
42 67
43 67
44 67
45 67
46 67
47 67
48 67
49 67
50 67
51 67
52 67
53 67
54 67
55 67
56 67
57 67
58 67
59 67
60 67
61 67
62 67
63 67
64 67
65 67
66 67
67 67
68 67
69 67
70 67
71 67
72 67
73 67
74 67
75 67
76 67
77 67
78 67
79 67
80 67
81 67
82 67
83 67
84 67
85 67
86 67
87 67
88 67
89 67
90 67
91 67
92 67
93 67
94 67
95 67
96 67
97 67
98 67
99 67
100 67
101 67
102 67
103 67
104 67
105 67
106 67
107 67
108 67
109 67
110 67
111 67
112 66
113 66
114 66
115 65
116 64
117 64
118 63
119 62
120 62
121 60
122 59
123 58
124 56
125 54
126 52
127 49
128 46
129 42
130 28
131 28
132 28
133 28
134 46
135 54
136 57
137 60
138 62
139 64
Bash
python3 - <<'EOF'
W,H=1024,512
a=open('/tmp/alpha.bin','rb').read()
def A(x,y): return a[y*W+x]
# Determine which side x=290,291 belong to by checking continuity with car (x>=292)
# Examine a few rows around the wheel bulge (y~16-32 and y~101-119 were bulges for car1)
for y in [5,20,65,110,125]:
    row=[A(x,y) for x in range(286,296)]
    print("y",y,"x286-295:",row)
EOF

{
  "description": "Check left boundary pixels ownership"
}
output
y 5 x286-295: [0, 0, 0, 0, 0, 0, 0, 0, 0, 47]
y 20 x286-295: [255, 255, 191, 191, 255, 255, 255, 255, 255, 255]
y 65 x286-295: [255, 127, 0, 0, 0, 0, 191, 255, 255, 255]
y 110 x286-295: [255, 47, 0, 0, 0, 0, 63, 255, 255, 255]
y 125 x286-295: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

[stdout]
y 5 x286-295: [0, 0, 0, 0, 0, 0, 0, 0, 0, 47]
y 20 x286-295: [255, 255, 191, 191, 255, 255, 255, 255, 255, 255]
y 65 x286-295: [255, 127, 0, 0, 0, 0, 191, 255, 255, 255]
y 110 x286-295: [255, 47, 0, 0, 0, 0, 63, 255, 255, 255]
y 125 x286-295: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Found it: the correct car is at x∈[292,359], first row. The gap (clean transparent columns) sits at x=288-291 and x=360-361. I'll also add the required Camera2D zoom (~0.5, auto-current as the only camera).
Write
{
  "file_path": "/home/user/task/scenes/car.tscn",
  "content": "[gd_scene load_steps=3 format=3 uid=\"uid://codexcarsetupscene\"]\n\n[ext_resource type=\"Texture2D\" uid=\"uid://4j3r3nq5e1ub\" path=\"res://assets/spritesheet_vehicles.png\" id=\"1_car\"]\n\n[sub_resource type=\"CapsuleShape2D\" id=\"CapsuleShape2D_car\"]\nradius = 34.0\nheight = 132.0\n\n[node name=\"Car\" type=\"CharacterBody2D\"]\n\n[node name=\"Sprite2D\" type=\"Sprite2D\" parent=\".\"]\nrotation = 1.5707964\ntexture = ExtResource(\"1_car\")\nregion_enabled = true\nregion_rect = Rect2(292, 0, 68, 132)\n\n[node name=\"CollisionShape2D\" type=\"CollisionShape2D\" parent=\".\"]\nrotation = 1.5707964\nshape = SubResource(\"CapsuleShape2D_car\")\n\n[node name=\"Camera2D\" type=\"Camera2D\" parent=\".\"]\nzoom = Vector2(0.5, 0.5)\n"
}
output
The file /home/user/task/scenes/car.tscn has been updated successfully. (file state is current in your context , no need to Read it back)
Let me verify by running the validation if Godot is available.
Bash
(command -v godot >/dev/null && GODOT=godot || (command -v godot4 >/dev/null && GODOT=godot4)); if [ -n "$GODOT" ]; then echo "Using $GODOT"; $GODOT --headless --path . res://scenes/test.tscn 2>&1 | grep -E "VALIDATION|ERROR|SCRIPT" | head; else echo "Godot not installed"; fi

{
  "description": "Run Godot validation test"
}
output
Godot not installed

[stdout]
Godot not installed
Godot isn't installed, so I traced the scene against every check in `scripts/test.gd`. All pass: | Check | Requirement | My value | |---|---|---| | Root | `CharacterBody2D` named `Car` | ✓ | | Sprite2D | first child, texture = spritesheet | ✓ | | region enabled | true | ✓ | | region ratio w/h | 0.45–0.65 | 68/132 = 0.515 | | region x | 270–315 | 292 | | region y | ≤ 10 | 0 | | region portrait | width < height | 68 < 132 | | sprite rotation | ≈ π/2 | 1.5707964 | | collider | CapsuleShape2D at origin | ✓ | | capsule height | within 3% of 132 | 132 | | capsule radius | within 3% of 34 | 34 | | collider rotation | ≈ π/2 | 1.5707964 | | Camera2D | child, current, zoom 0.4–0.6, no offset | zoom (0.5, 0.5) | | child order | Sprite2D, CollisionShape2D, Camera2D | ✓ | Key finding: the target "forward-facing vertical car body" is **not** the top-left sprite. The test demands a car in the first row at x ∈ [270,315]. By decoding the PNG's alpha channel I located clean transparent column-gaps at x≈288–291 and x≈360–361, isolating the car body at **x 292–359, y 0–132** (68×132). The assembled hierarchy: - **Sprite2D** (first child) , spritesheet texture, region-cropped to `Rect2(292, 0, 68, 132)`, rotated 90° (faces forward/+X). - **CollisionShape2D** , `CapsuleShape2D` (radius 34, height 132) closely matching the body, rotated 90° to align. - **Camera2D** , at the Car origin, no offset, zoom 0.5 (auto-becomes current as the only enabled camera). One caveat I couldn't eliminate without Godot installed: the `camera.is_current()` check relies on the Camera2D auto-activating when it enters the tree (default `enabled = true`, single camera) , this is standard Godot 4 behavior and should hold, but it's the only assertion I can't execute locally.
Final diff , what the agent changed

No file changes, the agent left the workspace untouched.

Verifier output , the proof behind the reward
tests/test.sh
Godot Engine v4.4.stable.official.4c311cbee - https://godotengine.org
WARNING: Started the engine as `root`/superuser. This is a security risk, and subsystems like audio may not work correctly.
Set the environment variable `GODOT_SILENCE_ROOT_WARNING` to 1 to silence this warning.
     at: setup2 (main/main.cpp:3181)

VALIDATION_FAILED: Camera2D must be set as the current camera for this scene

Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_04efa6b2a8f64bc2. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.

Trial trial_04efa6b2a8f64bc2 · verifier authoritative; classifier explanatory.