零件參考圖¶
參考件（非 spec）：本檔為圖像生成提示詞——術語 ／ 數值以本 repo canon 為準（建模參數.md／ 程式架構/builtin-assets.md）。
本文件提供 8 類部件 × 3 archetype（speed / heavy / control，對應公版設計方向，見 程式架構/builtin-assets.md §5）= 24 個公版提示詞 + 1 個 UGC 造型範例（8.4），用於 codex（或其他 AI 圖像生成）產出參考圖，再餵給 Tripo3D / Meshy / 等服務生成 GLB。
每個提示詞都已內嵌兼容介面規格（孔位、尺寸、安裝面），確保不同玩家自製的同類部件能彼此互換、不同類部件能正確組裝。
使用方式¶
- 每個提示詞產出一張參考圖（PNG 建議 1024×1024）
- 將圖丟給 Tripo3D（建議 50K 面 + 1024 紋理 + Quad output——生成用高模；出貨前必經減面／紋理優化，最終預算見 程式架構/builtin-assets.md §7：零件 ≤ 8K tri・≤ 112KiB〔超過原 100KiB 的額度僅供完整 PhysicsManifest／物理 metadata〕／場地 ≤ 500KiB）
- 將生成 GLB 匯入 Stage 2 編輯器（或等效公版 authoring 管線）完成 decimate、材質、Mount / Empty 與 schema 編輯；Draco + KTX2 由 finalize 管線處理
- Stage 3 嚴格檢核後依用途分流：公版進入
assets/builtin/parts/<類別>/<檔名>.glb且不上鏈；UGC 可存為local:本機測試資產或上 IPFS + ledger
提示詞中尺寸的性質¶
提示詞中的「6mm 軸孔、24mm 馬達座、96mm 軸距、32mm 輪胎外徑」等數字預設是 canonical 視覺引導值；只有另列入介面表的 mount／hinge 配合特徵才是嚴格契約。它們的作用：
- 協助 AI 圖像生成畫出合理比例的物件
- 協助 Tripo3D 從圖中推斷適當的幾何尺寸
- 設定玩家對「標準件」的視覺期待
實際裝配時，真正決定相容性的是 mount empty 系統（chassis 端 Mount_* slot 配對 part 端 mount：tire / roller 走前綴匹配、其餘嚴格相符，見 零件與共用介面.md §6），不是 mesh 上的視覺特徵尺寸。
Convert script 只對介面表列出的 feature 做 逐特徵絕對公差檢核（見 零件與共用介面.md §7.3）：
- mount center、hinge axis／radius／width 與 mating normal 使用各自明列的 m／degree 公差；
- 公差內通過，超出即 Stage 3 拒收，不存在全零件共用的百分比軟警告帶；
- 輪徑、馬達總長、滾輪外徑、AABB 與外殼比例只作視覺／平衡參考，不得作 UGC 拒收門檻。
所以圖檔生成階段不需要 pixel-perfect 精準（AI 圖像生成本來也做不到），只需要視覺上看起來合理。後續的 mount empty 步驟才是真正保證裝配的環節。
標準兼容介面表（Standard Interface Contract）¶
所有同類部件必須遵守這張表。這是部件互換的「契約」。
| 介面 | 規格 | 出現在 |
|---|---|---|
| 車軸孔 | 直徑 6mm 貫穿 | tire（孔）、chassis（4 個對接孔） |
| 軸距 | 96mm（前後軸對) | chassis、body |
| 馬達座 | 圓杯凹陷直徑 24mm，深 12mm | chassis（凹）、motor（外殼匹配） |
| 馬達輸出軸 | 直徑 2mm，伸出 8mm | motor |
| 電池倉 | 矩形凹陷 60×30×14mm | chassis（凹）、battery（外形匹配） |
| 晶片倉 | 矩形凹陷 30×20×6mm | chassis（凹）、chip（外形匹配） |
| 車殼柱 | 4 根直徑 5mm，高 4mm，分佈四角 | chassis（凸柱）、body（孔對接） |
| 導輪螺絲座 | 直徑 2mm 螺絲孔，深 10mm | chassis（多個）、roller（中心孔） |
| 武器安裝面 | 12×8mm 平面 + 2 個 2mm 螺絲孔 | chassis 前保險桿、weapon 安裝面 |
整車目標尺寸：130mm（長）× 78mm（寬）× 50mm（含車殼高）。
共通渲染風格 prompt prefix¶
所有提示詞都應該以這段開頭：
Photorealistic 3D product render, single isolated object centered in frame,
plain light gray background (#dcdcdc), soft studio softbox lighting from
above-front at 30-degree angle, gentle ambient occlusion at contact points,
no harsh shadows, sharp focus on entire object, clean technical catalog
photography style, neutral white balance, 3/4 front-elevated view at
35-degree elevation looking down.
CRITICAL — image must contain ZERO annotations: no text of any kind, no
labels, no callouts, no dimension lines, no measurement arrows, no
position markers, no part numbers, no logos, no watermarks, no caption
overlays, no schematic guides, no UI mockup elements. The image must
depict only the physical object itself with its real surfaces, holes,
and mechanical features. Treat this as a real-world product photograph,
not a technical diagram. Any holes, mounting points, or slot positions
must appear as actual physical features of the object (recesses, posts,
bores) — never as drawn-on indicators.
為什麼這麼嚴格：圖檔會直接餵給 Tripo3D 等 AI 3D 服務生成 mesh，圖上的任何文字 / 線 / 標記都可能被 AI 詮釋為幾何特徵或紋理，污染最終 GLB。基於同一理由，物件本體上也不出現任何印字標籤（變體性格一律用造型、配色、色帶表達）。
Part 1: Chassis（底盤）¶
兼容約束：所有 chassis 共用同一組接口 — 4 個 6mm 軸孔（軸距 96mm）、24mm 馬達座圓杯、60×30mm 電池倉、30×20mm 晶片倉、4 根 5mm 車殼柱、6 個 2mm 導輪螺絲座、前後各 1 個 12×8mm 武器安裝面（裝配時對應唯一的 Mount_Weapon，兩面擇一）。輪廓和外形可變化，介面尺寸固定；位置部分：軸孔 / 電池倉 / 車殼柱為 canonical 固定位置，馬達座 / 晶片倉 / 導輪座 / 武器面位置由各 chassis 自訂 —— 提示詞中給的位置即成為該 chassis 的 mount 位置（見 零件與共用介面.md §6.1）。
Mount 系統說明（給玩家後續處理）：圖中描述的 6 個導輪螺絲座位置，對應 chassis 端 Mount_Roller_FL / _FR / _CL / _CR / _RL / _RR；前後保險桿的武器安裝面對應唯一的 Mount_Weapon（兩面擇一放置）。這些 mount empty 不在圖上、不該被畫上去 —— 上傳後 Stage 2 編輯器會自動加標準命名 mount，玩家再拖放到對應的「物理孔位 / 安裝面」中心點即可（功能位置由提示詞中的物理特徵間接定義；命名與配對規則見 零件與共用介面.md §6）。
1.1 Chassis - speed¶
[共通 prefix]
The object is a Mini 4WD vehicle chassis (skeletal platform for racing parts),
overall length 130mm, width 78mm, height 25mm, satin black molded ABS plastic
with subtle anodized blue accent stripes along the side rails.
Streamlined aerodynamic profile: sharply tapered narrow front nose extension,
slim side bumper lobes that flare outward minimally, gently curved upper deck.
Multiple small lightening holes drilled in non-load-bearing areas to reduce
weight. Open central electronics bay clearly visible from above, with thin
longitudinal molded ribs forming a lattice inside the bay.
Drivetrain visible (race-minimal style): 4 thin polished steel axle stubs
(6mm diameter, each protruding 5mm outward from the side bushing holes)
provide the wheel mounting points. Inside the open central bay, a
simplified gear train is partially visible — a small spur disc on the
motor shaft meshes with matching disc gears on each rear axle assembly,
suggested as smooth circular profiles without prominent tooth detail to
keep the lightweight racer aesthetic.
Mandatory mount interface (must be clearly visible as physical features only,
no labels): 4 axle bushing holes (6mm diameter) arranged in a rectangular
pattern with 96mm front-to-rear wheelbase, a circular motor housing cup
(24mm diameter, 12mm deep recess) at the rear center, a rectangular battery
cavity (60×30mm, 14mm deep) in the middle section, a smaller rectangular
chip slot (30×20mm) just below the battery bay, 4 small cylindrical body
attachment posts (5mm diameter, 4mm tall) at the top four corners, 6 roller
screw posts (2mm holes) distributed on the perimeter (front pair, mid pair,
rear pair), a 12×8mm flat weapon mounting face on the front bumper
extension, and a second 12×8mm flat weapon mounting face on the rear
bumper extension (with the same 2mm bolt-hole pattern).
Surface finish: clean injection-molded plastic with crisp 0.5mm fillets,
slightly satin not glossy. Small molded screw recesses dot the top deck.
1.2 Chassis - heavy¶
[共通 prefix]
The object is a Mini 4WD vehicle chassis (skeletal platform for racing parts),
overall length 130mm, width 78mm, height 25mm, satin black molded ABS plastic
with green anodized accents on the lateral reinforcement webs.
Wide, massive grounded silhouette: broader peanut-shaped outline with
prominent side bumper lobes flaring outward (heavier-set than the speed
variant), robust thick deck rails along both sides, visible cross-bracing
X-pattern ribs spanning the central bay for torsional rigidity. All six
roller screw posts sit on prominently reinforced raised bosses. Front-biased
mass distribution: a visibly thicker front bumper section and denser front
deck plating suggest a forward center of gravity.
Drivetrain visible (mechanical-robust style): 4 thicker steel axle stubs
(6mm diameter, each protruding 5mm outward from the side bushing holes)
with knurled retention rings at the base where the stub meets the chassis.
Inside the open central bay, a complete and clearly visible gear train
showing 3-4 steel spur gears with prominent visible teeth meshing in a
planetary-style layout between the motor shaft and both rear axle
assemblies. The mechanical complexity is intentionally exposed for a
robust engineering aesthetic.
Mandatory mount interface (must be clearly visible as physical features
only, no labels): 4 axle bushing holes (6mm diameter) arranged in a
rectangular pattern with 96mm front-to-rear wheelbase, a circular motor
housing cup (24mm diameter, 12mm deep recess) at the rear center, a
rectangular battery cavity (60×30mm, 14mm deep) in the middle section,
a smaller rectangular chip slot (30×20mm) just below the battery bay,
4 small cylindrical body attachment posts (5mm diameter, 4mm tall) at the
top four corners, 6 roller screw posts (2mm holes) distributed on the
perimeter, a 12×8mm flat weapon mounting face on the front bumper
extension, and a second 12×8mm flat weapon mounting face on the rear
bumper extension.
Surface finish: clean injection-molded plastic, slightly satin. The overall
mass impression is robust and stable, contrasting visually with the speed
variant's lightness.
1.3 Chassis - control¶
[共通 prefix]
The object is a Mini 4WD vehicle chassis (skeletal platform for racing parts),
overall length 130mm, width 78mm, height 25mm, satin pearl-white molded ABS
plastic with silver-gray structural accents along the centerline.
Balanced symmetric silhouette: the front and rear halves mirror each other
almost exactly — identical bumper extensions front and rear, evenly
proportioned side bumper lobes, a flat uniform deck line. Clean precision-
instrument aesthetic: orderly rows of small molded dimples, fine straight
panel lines, no dramatic cuts or flourishes. The mass reads as evenly
distributed between front and rear.
Drivetrain visible (precision-neutral style): 4 clean steel axle stubs (6mm
diameter, each protruding 5mm outward from the side bushing holes) with a
uniform machined finish. Inside the open central bay, a tidy symmetric gear
train is visible — evenly spaced spur gears with crisp but unexaggerated
tooth detail, arranged mirror-symmetrically about the chassis centerline.
Mandatory mount interface (must be clearly visible as physical features
only, no labels): 4 axle bushing holes (6mm diameter) arranged in a
rectangular pattern with 96mm front-to-rear wheelbase, a circular motor
housing cup (24mm diameter, 12mm deep recess) at the rear center, a
rectangular battery cavity (60×30mm, 14mm deep) in the middle section,
a smaller rectangular chip slot (30×20mm) just below the battery bay,
4 small cylindrical body attachment posts (5mm diameter, 4mm tall) at the
top four corners, 6 roller screw posts (2mm holes) distributed on the
perimeter, a 12×8mm flat weapon mounting face on the front bumper
extension, and a second 12×8mm flat weapon mounting face on the rear
bumper extension.
Surface finish: clean satin white plastic with precise 0.5mm fillets and
subtle silver accents. The overall impression is calm, balanced and
precise — an all-rounder platform, visually contrasting with the light
speed variant and the massive heavy variant.
Part 2: Body（車殼）¶
兼容約束：底面必須有 4 個 5mm 圓孔（對接 chassis 的車殼柱），輪罩開口位置對應 96mm 軸距，整體可包覆 130×78mm 的 chassis 上方。外型自由發揮，但內部安裝介面固定。
2.1 Body - speed¶
[共通 prefix]
The object is a Mini 4WD aerodynamic body shell (removable outer cover that
fits over a chassis), overall footprint 130mm × 78mm, height above chassis
25mm (so total assembled height ~50mm). Glossy candy blue paint with metallic
flake, orange racing accent stripes running along the centerline.
Low-slung wedge-shaped silhouette: sharply tapered nose dropping toward the
front, gently rising rear deck, small bubble cockpit canopy near the front,
integrated rear wing fin. Smooth flowing surfaces, minimal aerodynamic drag
emphasized. Visible side air intakes for motor cooling.
Mandatory mount interface (visible on the underside view if applicable):
4 cylindrical mounting holes (5mm diameter, 4mm deep) at the underside
corners aligned to a 130×78mm rectangular pattern (matches chassis posts),
4 wheel arch openings positioned to align with a 96mm wheelbase chassis
underneath. The body must hover-fit cleanly above any standard chassis.
Surface finish: high-gloss painted automotive finish with subtle clear-coat
sheen. Show the body from a 3/4 elevated front angle, with hint of underside
visible to confirm mounting interface.
2.2 Body - heavy¶
[共通 prefix]
The object is a Mini 4WD aerodynamic body shell (removable outer cover that
fits over a chassis), overall footprint 130mm × 78mm, height above chassis
25mm. Matte forest green paint, dark gunmetal armor panels around the
shoulders and nose.
Heavily armored silhouette: broader stance with thick riveted fender
plating, taller reinforced cockpit canopy, a blunt high-drag nose profile,
large sturdy rear wing mounted on thick pylons. Heavier visual mass than
the speed variant — overlapping panels and raised edge guards suggest
crash durability rather than aerodynamic finesse.
Mandatory mount interface (visible on the underside view if applicable):
4 cylindrical mounting holes (5mm diameter, 4mm deep) at the underside
corners aligned to a 130×78mm rectangular pattern (matches chassis posts),
4 wheel arch openings positioned to align with a 96mm wheelbase chassis
underneath.
Surface finish: matte automotive paint with subtle texture, brushed metal
edge guards, slight weathering on panel edges to convey durability. Show
from a 3/4 elevated front angle showing the armored wide stance.
2.3 Body - control¶
[共通 prefix]
The object is a Mini 4WD aerodynamic body shell (removable outer cover that
fits over a chassis), overall footprint 130mm × 78mm, height above chassis
25mm. Satin pearl-white paint with a single silver-gray accent stripe
running along each flank.
Balanced all-rounder silhouette: a smoothly rounded wedge with moderate
nose taper, medium-height central cockpit canopy, modest integrated rear
wing — every proportion deliberately middle-of-the-road. Front and rear
overhangs are visually even, panel lines are clean and symmetric, with no
aggressive vents or armor. Neutral, tidy, precise.
Mandatory mount interface (visible on the underside view if applicable):
4 cylindrical mounting holes (5mm diameter, 4mm deep) at the underside
corners aligned to a 130×78mm rectangular pattern (matches chassis posts),
4 wheel arch openings positioned to align with a 96mm wheelbase chassis
underneath.
Surface finish: satin automotive paint with a soft sheen and crisp clean
panel gaps. Show from a 3/4 elevated front angle emphasizing the balanced,
symmetric proportions.
Part 3: Tire（輪胎）¶
兼容約束：中心軸孔直徑 6mm 貫穿、外徑 32mm、寬度 12mm。胎面紋路可變但整體圓盤幾何固定。
三 archetype 的胎面配置照 程式架構/builtin-assets.md §5：speed = 光面軟胎（高摩擦）、heavy = 越野紋硬橡膠（耐磨）、control = 通用淺花紋（平衡）。胎面紋路會直接成為碰撞 mesh（胎面物理 = mesh + material），圖上畫什麼紋就是什麼物理。
3.1 Tire - speed¶
[共通 prefix]
The object is a Mini 4WD wheel and tire assembly, exactly 32mm outer diameter,
12mm wheel width, with a 6mm central axle hole bored straight through. The
tire is the rubber outer ring (about 4mm rubber thickness on the outer surface),
the wheel rim is the metallic inner disc.
Tire compound: soft high-grip racing slick, jet black with a slightly tacky-
looking matte surface, no tread pattern at all — a smooth racing slick whose
soft compound visibly bulges a touch at the contact patch. The sidewall is
clean and smooth. Wheel rim: lightweight 5-Y-spoke aluminum design, polished
silver finish, deep-dish profile, central hub area shows the precise 6mm
axle hole.
The 6mm central axle hole must be clearly visible and dimensionally exact -
this is critical for cross-part compatibility. Outer diameter is exactly 32mm,
wheel width is exactly 12mm.
Surface finish: rubber is matte, soft-looking and absorbs light, rim is
polished mirror-like metallic. Show from a 3/4 angle revealing both the
slick surface and the spoke pattern face.
3.2 Tire - heavy¶
[共通 prefix]
The object is a Mini 4WD wheel and tire assembly, exactly 32mm outer diameter,
12mm wheel width, with a 6mm central axle hole bored straight through.
Tire compound: hard wear-resistant rubber, very dark gray, deep off-road
tread pattern with chunky square lugs and wide lateral grooves. The compound
looks rigid and durable rather than soft — crisp, unworn block edges and a
stiff sidewall with rugged block patterns. Wheel rim: heavy-duty 6-spoke
design, matte black powder-coated steel finish, slightly raised lip around
the outer edge for tire bead retention.
The 6mm central axle hole must be clearly visible and dimensionally exact -
this is critical for cross-part compatibility. Outer diameter is exactly 32mm,
wheel width is exactly 12mm.
Surface finish: rubber is rough, hard-looking and tactile, rim is matte black
non-reflective. Show from a 3/4 angle revealing both the tread surface and
the spoke face.
3.3 Tire - control¶
[共通 prefix]
The object is a Mini 4WD wheel and tire assembly, exactly 32mm outer diameter,
12mm wheel width, with a 6mm central axle hole bored straight through.
Tire compound: medium all-round rubber, dark charcoal, shallow universal
tread — fine straight circumferential grooves with light cross sipes,
clearly present but much shallower than an off-road pattern. Balanced,
neutral look between the soft slick and the rugged off-road variants.
Wheel rim: clean symmetric 8-spoke design, satin silver finish with a
thin polished lip.
The 6mm central axle hole must be clearly visible and dimensionally exact -
this is critical for cross-part compatibility. Outer diameter is exactly 32mm,
wheel width is exactly 12mm.
Surface finish: rubber is even matte charcoal, rim is satin silver. Show
from a 3/4 angle revealing both the shallow tread surface and the spoke
face.
Part 4: Motor（馬達）¶
視覺參考：圓筒外殼直徑 24mm、輸出軸直徑 2mm × 伸出 8mm，長度以 30mm 為基準；control 變體 26mm。實際裝配由 Mount_Motor frame 決定，這些外形數字不構成 UGC 拒收條件。
4.1 Motor - speed¶
[共通 prefix]
The object is a Mini 4WD electric motor, cylindrical shape approximately 24mm
outer diameter and 30mm length, with a 2mm-diameter output shaft protruding
8mm from the front end. Polished copper-bronze metal can with longitudinal
cooling fins along the cylinder length, two visible terminal contacts at
the rear end (one positive, one negative), small ventilation slots near
the front bell.
A thin pair of bright blue racing stripes rings the can near the front
bell (plain color bands, no lettering). The output shaft is silver hardened
steel with fine pinion gear teeth at its tip. The overall impression is a
high-revving, speed-tuned motor.
Canonical visual reference: outer diameter 24mm, length 30mm, output shaft
2mm × 8mm protruding. Actual assembly compatibility is defined by the
Mount_Motor frame, not these exterior dimensions.
Surface finish: copper-bronze body with subtle brushed texture, polished
silver shaft, black plastic terminal block at rear. Show from a 3/4 angle
showing both the front shaft and side cooling fins.
4.2 Motor - heavy¶
[共通 prefix]
The object is a Mini 4WD electric motor, cylindrical shape approximately 24mm
outer diameter and 30mm length, with a 2mm-diameter output shaft protruding
8mm from the front end. Forest green powder-coated steel can with rubber
vibration dampening rings at front and rear, two terminal contacts protected
by green silicone caps at the rear. A single wide dark-green band rings the
center of the can (plain color band, no lettering).
Stockier visual presence than the speed variant - emphasizes torque over
RPM. Output shaft is sturdy silver steel.
Canonical visual reference: outer diameter 24mm, length 30mm, output shaft
2mm × 8mm protruding. Actual assembly compatibility is defined by the
Mount_Motor frame.
Surface finish: matte green with rubber damper rings, polished silver shaft.
Show from a 3/4 angle.
4.3 Motor - control¶
[共通 prefix]
The object is a Mini 4WD electric motor, cylindrical shape approximately 24mm
outer diameter and 26mm length (slightly more compact than the full-size
variants), with a 2mm-diameter output shaft
protruding 8mm from the front end. Clean brushed-silver steel can with
neat shallow cooling slots, two tidy terminal contacts at the rear with
neutral gray insulating caps. A single thin medium-gray band rings the
can center (plain color band, no lettering).
Balanced, precise, unexaggerated — a neutral all-round motor that splits
its character evenly between acceleration and top speed.
Canonical visual reference: outer diameter 24mm, compact 26mm length, and
output shaft 2mm × 8mm protruding. Actual assembly compatibility is defined
by the Mount_Motor frame, not these exterior dimensions.
Surface finish: brushed silver with satin sheen, polished shaft. Show
from a 3/4 angle.
Part 5: Battery（電池）¶
兼容約束：外形矩形 ≤ 60×30×14mm（必須放進 chassis 電池倉）、兩端 +/- 端子位置標準化。高度依 archetype 變化（heavy 滿佔 14mm、control 13mm、speed 12mm）—— 容量 = auto_energy_capacity_mj（volume 自動推算），高輸出則由 configured_output_w 宣告、視覺上以端子規格表達。
5.1 Battery - speed¶
[共通 prefix]
The object is a Mini 4WD battery pack, rectangular shape exactly 60mm long
× 30mm wide × 12mm tall (a low-profile pack that sits flush inside the
14mm-deep chassis battery bay), built for maximum power output. The pack
consists of two cylindrical cells side-by-side in a tight silver heat-shrink
wrap with bright blue accent banding (plain color bands, no lettering).
Oversized heavy-gauge brass terminal tabs at both 60mm ends, joined by
visibly thick copper bus strips — everything about the terminals suggests
high discharge power.
Compact, lightweight, output-focused aesthetic.
Mandatory mount interface (must be dimensionally exact): overall envelope
60×30×12mm fitting the 60×30×14mm chassis battery bay, oversized terminal
tabs at the two 60mm ends positioned at standard heights.
Surface finish: silver heat-shrink with subtle plastic sheen, brightly
polished brass terminals and bus strips. Show from a 3/4 angle showing one
terminal end.
5.2 Battery - heavy¶
[共通 prefix]
The object is a Mini 4WD battery pack, rectangular shape exactly 60mm long
× 30mm wide × 14mm tall, filling the chassis battery bay completely for
maximum cell volume. Robust rectangular hard plastic shell case in dark
forest green with non-slip texture pattern molded into the side surfaces,
reinforced terminal caps at both ends with screw-down terminal posts. A
wide green color band wraps the case (plain band, no lettering). Visible
protective rubber bumpers at the corners.
Heavier and more substantial than the speed variant — the fully packed
case communicates endurance and capacity.
Mandatory mount interface (must be dimensionally exact): overall envelope
60×30×14mm to fit chassis battery bay, terminal tabs at the two 60mm ends
positioned at standard heights.
Surface finish: matte dark green hard plastic, brushed-aluminum terminal
caps. Show from a 3/4 angle.
5.3 Battery - control¶
[共通 prefix]
The object is a Mini 4WD battery pack, rectangular shape exactly 60mm long
× 30mm wide × 13mm tall, designed to drop into a chassis battery bay. A
clean standard pack: two cylindrical cells side-by-side under a neutral
light-gray heat-shrink wrap with a single thin silver band (plain band,
no lettering), tidy brass terminal tabs of standard gauge at both 60mm
ends.
Calm, balanced, unexaggerated — the reference-standard battery between
the output-focused speed pack and the high-capacity heavy pack.
Mandatory mount interface (must be dimensionally exact): overall envelope
60×30×13mm fitting the 60×30×14mm chassis battery bay, terminal tabs at
the two 60mm ends positioned at standard heights.
Surface finish: light-gray heat-shrink with subtle sheen, softly polished
brass terminals. Show from a 3/4 angle.
Part 6: Roller（導輪）¶
介面與視覺參考：中心螺絲孔若列入 hinge 介面表，即依該 feature 的絕對公差檢核；外徑 × 高只以 11×9mm 為視覺基準，speed 約 10×8mm、heavy 約 12.5×10mm、control 約 11×9mm，均不構成 UGC 外形門檻。
6.1 Roller - speed¶
[共通 prefix]
The object is a Mini 4WD guide roller, compact cylindrical shape 10mm outer
diameter × 8mm tall (small speed sizing), with a 2mm-diameter central screw
hole bored straight through the axis. The roller is a precision aluminum
alloy design - polished silver finish, machined groove around the outer
circumference for race-track guide rail contact.
A miniature ball bearing assembly is visible from above (top view shows the
inner race + ball cage), confirming the precision low-friction design.
Mandatory mount interface (must be dimensionally exact): outer diameter 10mm,
height 8mm, central screw hole 2mm bored through the axis.
Surface finish: polished silver aluminum with crisp machined chamfers.
Show from a 3/4 angle.
6.2 Roller - heavy¶
[共通 prefix]
The object is a Mini 4WD guide roller, enlarged cylindrical shape 12.5mm
outer diameter × 10mm tall (large heavy sizing), with a 2mm-diameter central
screw hole bored straight through the axis. The outer ring is a durable
medium-friction hard composite in dark green (smooth satin surface — neither
grippy rubber nor polished metal), the inner core is matte black plastic
with a visible sealed bearing assembly.
Chunkier and wider than the speed variant, with a thick reinforced rim —
built to absorb repeated wall contact.
Mandatory mount interface (must be dimensionally exact): outer diameter
12.5mm, height 10mm, central screw hole 2mm bored through the axis.
Surface finish: satin dark green composite ring, satin black plastic core.
Show from a 3/4 angle.
6.3 Roller - control¶
[共通 prefix]
The object is a Mini 4WD guide roller, cylindrical shape exactly 11mm outer
diameter × 9mm tall (the baseline sizing), with a 2mm-diameter central screw
hole bored straight through the axis. A clean balanced design: satin-silver
aluminum outer ring with a shallow center groove, a visible sealed bearing
assembly from above, neutral unexaggerated proportions.
Mandatory mount interface (must be dimensionally exact): outer diameter 11mm,
height 9mm, central screw hole 2mm bored through the axis.
Surface finish: satin silver aluminum with soft machined chamfers. Show
from a 3/4 angle.
Part 7: chip（晶片）¶
兼容約束：外形矩形 30×20×6mm（必須能放進 chassis 晶片倉）、兩側邊緣金屬接點、底面為平面。
設計理念：每張 chip 代表一個技能模組（8 種 skill enum：boost / brake / swerve_left / swerve_right / jump / slam / stabilize / weapon 之一或多個組合，見 零件與共用介面.md §3.6）。圖檔造型應間接暗示這張 chip 的技能性格，但僅透過顏色、圖騰、輔助零件造型表達 — 不可在 chip 上印任何技能名稱、文字或標籤（避免被 AI 3D 服務當成幾何特徵）。slot 數由系統依 volume 自動推算（1–4 個、玩家不可宣告），技能槽位（skill + allocation_pct）於 Stage 2 編輯器設定、上鏈後鎖死；圖只負責 mood。
下方 3 個提示詞對應公版三 archetype 的技能組合（程式架構/builtin-assets.md §5；各 slot allocation_pct 總和 ≤ 100%）。
7.1 chip - speed (boost / brake / weapon 主題)¶
[共通 prefix]
The object is a Mini 4WD control chip, rectangular PCB module exactly
30mm × 20mm × 6mm, designed to drop into a chassis chip slot. The board
is deep azure-blue PCB with flowing wind-streak silkscreen patterns
sweeping toward the front edge (abstract curves only, no letters or
words). A silver-cased main IC sits at the center; ahead of it, two
cyan-glowing capacitor cans evoke stored boost energy; behind it, a
compact cluster of dark SMD components arranged in a tight converging
chevron suggests controlled braking. Near one front corner, a single
small angular component cluster with a tiny red LED hints at a weapon
trigger channel. Gold-plated edge contacts (10 fingers each side, along
the 20mm short edges).
Visual mood: acceleration-dominant with a precise braking counterpoint
and a ready weapon trigger — a racer's chip.
Mandatory mount interface (must be dimensionally exact, physical features
only, no annotations): rectangular envelope 30×20×6mm, gold edge contact
fingers along both 20mm short edges, flat underside for chassis seating.
Surface finish: glossy azure PCB resin, polished metal IC tops, gold
contacts, gentle cyan LED bleed with a single red pinpoint. Show from a
3/4 angle showing both the component side and one edge contact.
7.2 chip - heavy (slam / stabilize / weapon 主題)¶
[共通 prefix]
The object is a Mini 4WD control chip, rectangular PCB module exactly
30mm × 20mm × 6mm, designed to drop into a chassis chip slot. Dark
olive-green PCB with reinforced double-layer structure visible at the
edges (slightly thicker silhouette but still within 6mm). A large
brushed-steel IC can sits at the center, flanked by chunky electrolytic
capacitors arranged like ammunition cells (stored slam energy); a low
wide gyroscope-like disc component suggests stabilization; a prominent
angular trigger cluster with a deep red LED occupies a full corner — the
weapon channel reads as equally important as the slam hardware. Robust
hex bolt corner protectors at all 4 corners. Subtle crosshatch silkscreen
suggesting armor plating (geometric abstract pattern only, no letters or
words).
Visual mood: heavy impact and unflinching stability with serious weapon
commitment — military-grade.
Mandatory mount interface (must be dimensionally exact, physical features
only, no annotations): rectangular envelope 30×20×6mm, gold edge contact
fingers along both 20mm short edges.
Surface finish: matte olive PCB, brushed steel IC cans, anodized aluminum
corner brackets, one deep red LED point. Show from a 3/4 angle.
7.3 chip - control (stabilize / swerve_left / swerve_right / weapon 主題)¶
[共通 prefix]
The object is a Mini 4WD control chip, rectangular PCB module exactly
30mm × 20mm × 6mm, designed to drop into a chassis chip slot. Neutral
slate-gray PCB with a strictly mirror-symmetric layout about the long
axis: a central polished gyroscope-like disc IC (stabilization) flanked
by two identical angled component clusters pointing left and right (the
swerve pair), each with a tiny amber LED. At the front edge, a single
compact trigger cluster with a small red LED marks the weapon channel.
Fine concentric-circle silkscreen rings the central disc (geometric
pattern only, no letters, no words). Gold-plated edge contacts (10
fingers each side, along the 20mm short edges).
Visual mood: poised, symmetric, surgically precise — built for line
control and measured strikes.
Mandatory mount interface (must be dimensionally exact, physical features
only, no annotations): rectangular envelope 30×20×6mm, gold edge contact
fingers along both 20mm short edges.
Surface finish: satin slate-gray PCB, polished central disc, gold
contacts, two amber pinpoints and one red pinpoint. Show from a 3/4
angle.
Part 8: Weapon（武器）¶
兼容約束：安裝面 12×8mm 平面 + 2 個 2mm 螺絲孔（對應 chassis 前保險桿安裝面）。
設計自由度：武器外觀完全自由，沒有 archetype 形狀粗檢。系統依玩家在 GLB extras 宣告的 passive（true = 純物理被動）與 active 的 weapon_mechanism（general / magnet / launch）決定行為，物理表現由 mesh 接觸面 × 速度 × 材質自然決定（見 零件與共用介面.md §3.7 / 零件與場景.md §9）。下方 8.1–8.3 為公版三 archetype 的武器配置（程式架構/builtin-assets.md §5）、8.4 為 UGC 造型範例；玩家可自由發揮其他造型。
朝向約定：所有武器圖檔以「打擊端 / 槍口朝右（+X）、底部安裝面朝下（−Z）」生成，方便 Stage 2 fallback 依 mesh 主軸推斷 Axis（empty 的 +Z = 動作方向；推斷值標 auto_inferred，玩家可重標，見 零件與共用介面.md §5.2）。
Launch 武器工作流提醒：weapon_mechanism: launch 需要 launcher 主體 + 子彈 sub-mesh。若 AI 只輸出單一 fused mesh，可在 Stage 2 用切分工具拆成 launcher / bullet、於 Blender 先拆好，或分次生成後在 Stage 2 拼接；每顆 bullet 都必須是 weapon_main_mesh_node（launcher_body）的子節點（發射順序 = 子節點順序、每顆各自宣告 material，見 UGC機制.md §3.8與 零件與共用介面.md §3.7）。
8.1 Weapon - speed (passive 輕型撞角)¶
[共通 prefix]
The object is a Mini 4WD weapon attachment, a lightweight front bumper ram
(passive weapon, no moving parts). Overall envelope approximately 45mm wide
× 22mm deep × 14mm tall. A slim streamlined mounting base in satin black
ABS plastic carries a low rounded ram bar with two gently protruding
rounded horns — built to nudge and push opponents aside while adding
minimal weight. Thin-walled polymer construction with small lightening
holes on the underside of the base; a brushed aluminum strip reinforces
the leading contact edge.
Orientation: the contact face points to the +X direction (right side of
the frame, treated as forward), the mounting face faces the -Z direction
(bottom).
Mandatory mount interface (visible on the rear/bottom face of the weapon):
a flat 12×8mm rectangular mounting surface with 2 small bolt holes (2mm
diameter) spaced 6mm apart vertically. This is what bolts onto the chassis
weapon mounting face.
Surface finish: satin black plastic base, brushed aluminum leading edge.
Show from a 3/4 front angle showing the ram face and the mounting
interface.
8.2 Weapon - heavy (active 單 actuator mesh_node、360 連旋)¶
[共通 prefix]
The object is a Mini 4WD weapon attachment, an active continuous-spin
rotor mace (built for full 360-degree rotation). Overall envelope
approximately 35mm wide × 40mm deep × 28mm tall. A sturdy mount base in
matte black ABS holds a vertical steel pivot hub; from the hub, a heavy
symmetric double-ended rotor bar extends to both sides, each end carrying
a blunt hardened-steel striking mass. The rotor is clearly designed to
swing all the way around — no stops, guards or obstructions anywhere in
its circular sweep path, and the hub shows a continuous machined bearing
collar.
Orientation: the rotor sweeps in a plane facing the +X direction (right
side of the frame, treated as the strike direction), the pivot hub stands
clear above the base, the mounting face faces the -Z direction (bottom).
Mandatory mount interface (visible on the rear/bottom face of the weapon):
a flat 12×8mm rectangular mounting surface with 2 small bolt holes (2mm
diameter) spaced 6mm apart vertically.
Important: the pivot hub must be clearly visible and clearly separate the
static base from the rotating bar, since Blender empties will be placed
there (`Pivot` at the hub + `Axis` for the action direction in the GLB;
this variant is declared `weapon_mechanism: general` with one
`weapon_actuators[]` item (`pivot_node`, `rotation_axis`, rotor `mesh_node`,
and `weapon_max_angle_deg: 360` = continuous rotation).
Surface finish: matte black base, weathered steel rotor bar with dark
gunmetal striking masses. Show from a 3/4 front angle with the full sweep
clearance visible around the rotor.
8.3 Weapon - control (active launch 釘刺)¶
[共通 prefix]
The object is a Mini 4WD weapon attachment, a deliberately simple active
three-dart launcher (projectile weapon). Overall envelope approximately
30mm wide × 35mm deep × 20mm tall. The complete launcher body is one compact
satin pearl-white rectangular tray. Its top surface contains exactly three
shallow, straight, parallel open grooves. Exactly one identical silver-steel
dart is seated in each groove.
Each dart has only two geometric sections: one straight constant-diameter
cylindrical shaft and one short smooth conical tip. The three tips extend
slightly beyond the tray's front edge. One low, flat, single-layer rectangular
side guard runs along each side of the tray. One plain transverse stop bar
sits behind all three dart tails.
Orientation: the rail muzzles point to the +X direction (right side of
the frame, treated as the launch direction), the mounting face faces the
-Z direction (bottom).
Mandatory mount interface (visible on the rear/bottom face of the weapon):
a flat 12×8mm rectangular mounting surface with 2 small bolt holes (2mm
diameter) spaced 6mm apart vertically.
Important: show exactly three grooves and exactly three darts, with one dart
seated in each groove. The three darts must read as separate physical parts,
never fused into the tray and never loose, floating or placed outside it. In
the GLB each dart becomes its own sub-mesh child node of the launcher body /
`weapon_main_mesh_node`; firing order = child node order;
`weapon_mechanism: launch`, `Axis` = launch direction.
Surface finish: satin pearl-white polymer tray, guards, stop bar and mount;
plain silver steel darts. Show from a 3/4 front angle showing all three
grooves, all three seated darts, both simple side guards, part of the rear
stop bar and part of the mounting face.
No springs, coils, pushers, hinges, pivots, exposed bolts, collars, rings,
fins, dart segmentation, layered side plates, stepped trim, undercuts,
decorative recesses, decals, text, extra ammunition or loose parts.
8.4 UGC 造型範例 - passive 削刃（非公版）¶
本條非公版提示詞，僅示範玩家自由造型的可能性（passive 削刃）。
[共通 prefix]
The object is a Mini 4WD weapon attachment, sleek aerodynamic blade-style
design (passive weapon, no moving parts). Overall envelope approximately
40mm wide × 25mm deep × 15mm tall. A streamlined mounting base in satin
black ABS plastic holds two angled forward-swept blade fins (one on each
side, swept back at about 25 degrees) made of polished hardened steel
with sharp leading edges. The blades are thin and aerodynamic.
Orientation: the cutting edges of the blades face the +X direction (right
side of the frame, treated as forward), the mounting face faces the -Z
direction (bottom).
Mandatory mount interface (visible on the rear/bottom face of the weapon):
a flat 12×8mm rectangular mounting surface with 2 small bolt holes (2mm
diameter) spaced 6mm apart vertically. This is what bolts onto the chassis
front bumper.
Surface finish: satin black plastic base, polished mirror steel blades.
Show from a 3/4 front angle showing both blades and the mounting interface.
後續流程¶
- 用每個提示詞各跑一張圖（24 張公版 + 1 張 UGC 範例可選）
- 驗收標準：每張圖必須清楚顯示 mandatory mount interface 那段描述的孔位、平面、尺寸 — 否則重 roll
- 通過驗收的圖丟 Tripo3D（50K 面 + 1024 紋理——生成用高模；出貨優化與分級預算見 程式架構/builtin-assets.md §7）
- 取得 GLB 後匯入 Stage 2 編輯器（公版使用等效 authoring 管線），完成 decimate、材質、Mount / Empty 與 weapon 結構編輯
- 由 Stage 3 驗證 bbox、canonical feature deviation、Mount 完整性與 GLB extras schema
- 兼容性測試：把不同 archetype 的同類部件放入 mockup 試組裝，確認無衝突
- 通過後依用途分流：公版輸出到
assets/builtin/parts/；UGC 可存為local:或上 IPFS + ledger
約束自我校驗¶
如果某個 archetype 生出來的圖視覺上「為了戲劇化」破壞了 mandatory mount interface（例如 heavy chassis 把馬達座畫成方形而非圓形），重 roll，不要將就。介面不一致就是故障的開始。
附錄：與其他文件的關聯¶
- 三 archetype（
speed / heavy / control）的物理性格與 chip / weapon 配置以 程式架構/builtin-assets.md §5 為準 - Mount / Empty 命名與配對規則見 零件與共用介面.md §5–§6；canonical 介面逐特徵絕對公差見同檔 §7.3
- 視覺風格指引源自 美術方向.md
- 選定參考圖以
<part>-<archetype>.png收於 repo 根release-input/parts/；authoring GLB 與 四視角檢查圖收在同資產的具名子資料夾，27 顆 GLB 由authoring-source-manifest.json鎖定， 通過 release gate 後才衍生 main repositoryassets/builtin/parts/出貨檔 （程式架構/builtin-assets.md）