docs(art): 新增主角模型AI生成提示词(混元+Tripo)
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# 主角角色模型 — AI 生成提示词
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> 关联设计文档：`docs/design/protagonist-character.md`
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> 目标规格：Lowpoly < 3000 面，512×512 贴图，卡通比例（头偏大）
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> 生成日期：2026-06-02
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---
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## 一、混元3D 提示词
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> 混元官方推荐格式：`{量词}+{主体}，{详细描述}，{风格}`
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### 方案 A — 完整角色（推荐首选）
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```
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一个低多边形风格的中国男孩角色，约10岁，微壮结实的体格，圆脸带点婴儿肥，小麦色皮肤，短而蓬松的深棕色头发，前额有碎发刘海，穿一件宽松的浅蓝色短袖T恤、深蓝色宽松短裤、深蓝色塑料凉鞋，左手腕戴着灰色电子手表，脖子上挂着红绳穿着的钥匙，低多边形风格
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```
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### 方案 B — 精简版（生成更稳定）
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```
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一个低多边形风格的中国小男孩，圆脸，小麦色皮肤，蓬松的短发，穿浅蓝色宽松T恤、深蓝色短裤和塑料凉鞋，低多边形风格
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```
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### 方案 C — 英文版（备用）
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```
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A low-poly 3D character of a Chinese boy around 10 years old, sturdy build, round face with baby fat, tanned wheat-colored skin, short puffy dark brown hair with bangs, wearing a loose light blue T-shirt, dark blue shorts, dark blue plastic sandals, a gray digital watch on left wrist, a key on red string around neck, low-poly style
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```
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---
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## 二、Tripo AI 提示词
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> Tripo 官方角色模板：`[风格] design of a [主体], with a [体型]. Key characteristics are [特征1] and [特征2]. Presented in [姿势]. [服装/皮肤描述]. [质量/技术规格]. (negative: [排除项])`
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### 方案 A — 完整角色（推荐首选）
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**Prompt：**
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```
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Low-poly cartoon design of a 10-year-old Chinese boy character, with a sturdy build and slightly large head. Key characteristics are a round face with baby fat and tanned wheat-colored skin. Presented in A-pose. Wearing a loose light blue round-neck T-shirt, dark blue knee-length shorts, and dark blue plastic sandals. Short puffy dark brown hair with messy bangs, a gray digital watch on left wrist, a house key on red string around neck. Hand-painted flat color textures, game-ready model. (negative: no background, no weapons, no modern smartphone, no realistic proportions)
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```
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**推荐高级设置：**
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| 设置 | 推荐值 | 原因 |
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|------|--------|------|
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| 风格 | Cartoon | 匹配 Lowpoly 卡通化比例 |
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| 高清纹理 | ✅ 开启 | 保证 T恤/短裤的色彩区分度 |
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| PBR | ❌ 关闭 | Lowpoly 手绘风格，不需要物理渲染材质 |
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| 面数限制 | 中 | Lowpoly 目标 < 3000 面 |
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| 姿势 | A-pose | 游戏角色标准绑定姿势 |
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| Tripo 版本 | 2.5 | 最新最高质量 |
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| 模型比例 | 默认 | 保持儿童比例 |
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### 方案 B — 精简核心版（生成更稳定）
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**Prompt：**
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```
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Low-poly 3D character of a young Chinese boy, round face, tanned skin, short messy dark brown hair, wearing light blue loose T-shirt and dark blue shorts with plastic sandals, cartoon style, A-pose, flat colors, game asset. (negative: no background, no realistic details)
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```
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### 方案 C — 仅上半身（聚焦头部和服装细节）
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**Prompt：**
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```
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Low-poly cartoon bust of a 10-year-old Chinese boy, round face with baby fat, warm tanned wheat skin, short puffy dark brown hair with messy bangs, thick short eyebrows, small round nose, slightly thick lips with a subtle smile, wearing a loose light blue T-shirt with simple chest print, a gray digital watch on left wrist, a red string necklace with a small key, hand-painted texture style. (negative: no background, no adult proportions, no realistic skin detail)
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```
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**推荐高级设置：**
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| 设置 | 推荐值 | 原因 |
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|------|--------|------|
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| 风格 | Cartoon | — |
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| 高清纹理 | ✅ 开启 | 面部五官和 T恤印花需要清晰 |
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| PBR | ❌ 关闭 | — |
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| 面数限制 | 中-高 | 半身像可适当提高面数 |
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| 姿势 | 无 | 半身像不需要 |
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### 方案 D — 中文版（备用）
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**Prompt：**
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```
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低多边形卡通风格的中国小男孩角色，约10岁，结实微壮的体型，头部略大，圆脸带婴儿肥，小麦色皮肤，短而蓬松的深棕色头发，前额有碎刘海，穿浅蓝色宽松圆领T恤，深蓝色及膝短裤，深蓝色塑料凉鞋，左手腕戴灰色电子手表，脖子挂红绳钥匙，手绘平面色彩纹理，游戏角色模型，A姿势。 (negative: 无背景, 无武器, 无现代手机, 无写实比例)
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```
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---
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## 三、提示词要素对照表
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| 设计要素 | 混元3D | Tripo AI | 文档来源 |
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|---------|--------|----------|---------|
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| 风格 | 低多边形风格 | Low-poly cartoon | style-guide.md |
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| 年龄 | 约10岁 | 10-year-old | §一 角色定位 |
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| 体型 | 微壮结实 | sturdy build, slightly large head | §三 体型比例 |
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| 脸型 | 圆脸带婴儿肥 | round face with baby fat | §四 面部特征 |
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| 肤色 | 小麦色皮肤 | tanned wheat-colored skin (#C4956A) | §四 肤色 |
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| 发型 | 短而蓬松的深棕色头发 | short puffy dark brown hair with messy bangs | §五 发型 |
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| T恤 | 宽松浅蓝色短袖T恤 | loose light blue round-neck T-shirt | §六 服装 |
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| 短裤 | 深蓝色宽松短裤 | dark blue knee-length shorts | §六 服装 |
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| 凉鞋 | 深蓝色塑料凉鞋 | dark blue plastic sandals | §六 服装 |
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| 手表 | 灰色电子手表 | gray digital watch on left wrist | §六 配件 |
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| 钥匙 | 红绳钥匙 | key on red string around neck | §六 配件 |
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---
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## 四、生成后的处理流程
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1. **挑选最佳结果** — 对比多个方案的生成质量
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2. **Blender 后处理**
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- 减面/补面至 < 3000 面
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- 检查和修补网格（流形、法线方向）
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- 手动添加 T恤印花贴图
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- 手动添加肤色晒痕细节（短袖遮盖处与暴露处的色差）
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3. **UV 与贴图** — 合并为单张 512×512 贴图（面部 + T恤正反面 + 短裤 + 鞋）
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4. **导出 FBX** — 导入 UE5，设置材质和骨骼
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5. **验收检查** — 对照 `protagonist-character.md` 的设计禁忌清单
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---
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## 五、生成记录
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| 日期 | 工具 | 方案 | 文件 | 备注 |
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|------|------|------|------|------|
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| 2026-06-02 | — | — | `boy1.fbx` | 已有文件，待确认来源 |
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