Make a tyreタイヤを作る

1タイヤのモデルを作る

1Model the tyre

タイヤを Blender で作り、OBJ に書き出すまでです。タイヤはホイールとも車体とも別のファイルで作ります。

This chapter takes a tyre from Blender to an exported OBJ. Tyres are built in a separate file from both the wheel and the body.

最小のタイヤを作る

Make a minimal tyre

1. Blender新しいファイルで、ゲージを置く。Scripting タブで modeling_tools/blender_tire_gauge.py を実行する。同梱のノーマルタイヤの寸法（外径 0.45m・内径 0.334m・幅 0.38m）で、外形の円柱・内径の円柱・踏面の幅・断面・車軸の線・地面が置かれる
2. Blender外形の円柱に収まるように、タイヤだけを作る。ビードを内径の円柱の両端に合わせる（幅 0.32m はホイールのリムと同じ規格なので、これでどのホイールにも嵌まる）。原点は車軸の中心、回転軸は左右（X）。ホイールは入れない
3. Blenderゲージを除いてタイヤだけを選び、OBJ に書き出す。「Selected Only」を入れ、「Triangulated Mesh」は入れない（設定の全体は車の 5 章と同じ）
4. ファイル書き出したファイルとテクスチャを置く。assets/mypack/models/entity/my_tire.obj（.mtl も一緒に）と assets/mypack/textures/entity/my_tire.png

これで、タイヤのモデルができました。換装画面で選べるようにするのは2 章です。

1. BlenderIn a new file, place the gauge. Run modeling_tools/blender_tire_gauge.py from the Scripting tab. Sized after the bundled normal tyre (0.45 m outer radius, 0.334 m inner radius, 0.38 m wide), it places the outer cylinder, the inner cylinder, the tread width, the section, the axle line and the ground
2. BlenderModel the tyre alone, inside the outer cylinder. Put the beads on the ends of the inner cylinder (the 0.32 m width is the same standard as the wheel rims, so it fits every wheel). Origin at the axle centre, spin axis left–right (X). Do not include a wheel
3. BlenderSelect only the tyre (not the gauge) and export it as OBJ. Tick "Selected Only" and leave "Triangulated Mesh" off (the full settings are the same as chapter 5 of the Car guide)
4. FilePut the exported file and the texture in your pack: assets/mypack/models/entity/my_tire.obj (with its .mtl) and assets/mypack/textures/entity/my_tire.png

The tyre model is done. To make it selectable in the parts screen, go to chapter 2.

必要なときだけ

Only when you need it

{
  "wheel": {
    "model": "mypack:models/entity/my_wheel.obj",
    "texture": "mypack:textures/entity/my_wheel.png",
    "rimRadius": 0.33
  }
}

{
  "wheel": {
    "model": "mypack:models/entity/my_wheel.obj",
    "texture": "mypack:textures/entity/my_wheel.png",
    "rimRadius": 0.33
  }
}

2タイヤを部品にする

2Make a tyre a part

ダート用・オフロード用のような、走りが変わるタイヤを作ります。タイヤはホイールとは別の部品で、路面ごとのグリップが変わります。

Make a tyre that changes how the car drives, such as a gravel or mud-terrain tyre. Tyres are a separate part from wheels, and they change grip on each surface.

最小のタイヤ部品を作る

Make a minimal tyre part

1. Blenderタイヤのモデルを作って置く。作り方は 1 章。ここでは assets/mypack/models/entity/my_tire.obj と assets/mypack/textures/entity/my_tire.png に置いたとする
2. ファイル見た目のファイルを置く。assets/mypack/car_parts/my_tire.json（部品と同じファイル名）。必ず "tire" の中に書く:

   {
     "tire": {
       "model": "mypack:models/entity/my_tire.obj",
       "texture": "mypack:textures/entity/my_tire.png"
     }
   }

3. ファイル部品のファイルを置く。data/mypack/car_parts/my_tire.json（ファイル名が部品名）:

   {
     "slot": "tire",
     "tire": {
       "grip": { "paved": 0.90, "gravel": 1.20 }
     }
   }

4. lang表示名を lang に書く。"part.mypack.my_tire": "マイタイヤ"

これで、ゲームの G →「パーツ」→「タイヤ」のタブに並びます。数字はノーマルタイヤに対する倍率で、この例は舗装で 0.9 倍・砂利で 1.2 倍のグリップです。

1. BlenderBuild the tyre model and put it in your pack. See chapter 1. Here it is at assets/mypack/models/entity/my_tire.obj and assets/mypack/textures/entity/my_tire.png
2. FileAdd the looks file assets/mypack/car_parts/my_tire.json (same file name as the part). Always write it inside "tire":

   {
     "tire": {
       "model": "mypack:models/entity/my_tire.obj",
       "texture": "mypack:textures/entity/my_tire.png"
     }
   }

3. FileAdd the part file data/mypack/car_parts/my_tire.json (the file name is the part name):

   {
     "slot": "tire",
     "tire": {
       "grip": { "paved": 0.90, "gravel": 1.20 }
     }
   }

4. langAdd the display name to lang. "part.mypack.my_tire": "My Tyres"

It now appears under G → "Parts" → the "Tyres" tab. The numbers are ratios to the Normal tyre; this one has 0.9× grip on tarmac and 1.2× on gravel.

できあがりの形:

What you end up with:

mypack.jar
├── assets/                       ← 見た目
│   └── mypack/
│       ├── car_parts/
│       │   └── my_tire.json      ← 見た目のファイル（"tire" の中）
│       ├── lang/
│       │   ├── en_us.json        ← "part.mypack.my_tire"
│       │   └── ja_jp.json
│       ├── models/
│       │   └── entity/
│       │       ├── my_tire.obj
│       │       └── my_tire.mtl
│       └── textures/
│           └── entity/
│               └── my_tire.png
└── data/                         ← 素性
    └── mypack/
        ├── car_parts/
        │   └── my_tire.json      ← 部品のファイル（"slot": "tire" と性能）
        └── cars/
            └── <車>.json         ← 純正にするなら default_parts.tire（任意）

mypack.jar
├── assets/                       <- looks
│   └── mypack/
│       ├── car_parts/
│       │   └── my_tire.json      <- looks file (inside "tire")
│       ├── lang/
│       │   ├── en_us.json        <- "part.mypack.my_tire"
│       │   └── ja_jp.json
│       ├── models/
│       │   └── entity/
│       │       ├── my_tire.obj
│       │       └── my_tire.mtl
│       └── textures/
│           └── entity/
│               └── my_tire.png
└── data/                         <- what it is
    └── mypack/
        ├── car_parts/
        │   └── my_tire.json      <- part file ("slot": "tire" and performance)
        └── cars/
            └── <car>.json         <- default_parts.tire to make it stock (optional)

assets/ と data/ の car_parts/ に、同じファイル名で 1 つずつ置きます。

One file each in the car_parts/ folders of assets/ and data/, with the same file name.

必要なときだけ

Only when you need it

{
  "slot": "tire",
  "tire": {
    "stiffness": 0.85,
    "grip":    { "paved": 0.88, "dirt": 1.20, "gravel": 1.25, "sand": 1.10, "snow": 1.10 },
    "rolling": { "paved": 1.15 }
  }
}

{
  "slot": "tire",
  "tire": {
    "stiffness": 0.85,
    "grip":    { "paved": 0.88, "dirt": 1.20, "gravel": 1.25, "sand": 1.10, "snow": 1.10 },
    "rolling": { "paved": 1.15 }
  }
}

{
  "slot": "tire",
  "order": 30,
  "cars": ["mypack:kei"],
  "tire": { "grip": { "paved": 0.90, "gravel": 1.20 } }
}

{
  "slot": "tire",
  "order": 30,
  "cars": ["mypack:kei"],
  "tire": { "grip": { "paved": 0.90, "gravel": 1.20 } }
}

3チェックリスト

3Checklist

見落としやすいところを並べます。症状が出てから探すときは配布の 3 章へ。

What is easy to miss. If something is already wrong, go to chapter 3 of Shipping.

書き出す前（Blender）

Before exporting (in Blender)

• タイヤだけを別ファイルで作った（ホイールは入れない）・原点は車軸・回転軸は X
• 外形の円柱に収め、ビードを内径の円柱の両端に合わせた

• Tyre alone in its own file (no wheel), origin at the axle, spin axis X
• Kept inside the outer cylinder, beads on the ends of the inner cylinder

ゲームで見る前

Before loading it in game

• 部品のファイル（data/）に "slot": "tire" と "tire": { ... } を書いた
• 見た目のファイル（assets/）は "tire" の中に書き、ファイル名を部品と同じにした

• The part file (data/) has "slot": "tire" and "tire": { ... }
• The looks file (assets/) is written inside "tire" and has the same file name as the part

付録 A. タイヤの全項目

Appendix A. Every tyre key

素性 — data/<pack>/car_parts/<part>.json

Definition — data/<pack>/car_parts/<part>.json

見た目 — assets/<pack>/car_parts/<part>.json（"tire": { ... } の中。いちばん外側には書けない）

Looks — assets/<pack>/car_parts/<part>.json (inside "tire": { ... }; not at the top level)

車の側 — data/<pack>/cars/<car>.json のいちばん外側

On the car — top level of data/<pack>/cars/<car>.json