Refactor road assembly module

.trellis/spec/blender/index.md

@@ -38,7 +38,7 @@
 │   osmassets/materials.py  材质构建（消费 catalog 的声明）  │
 │   osmassets/tree.py       树实例化                        │
 │   osmassets/water.py grass.py scrub.py                    │
-│   osmassets/building.py fountain.py   要素装配            │
+│   osmassets/building.py fountain.py roads.py   要素装配   │
 │                                                          │
 │   generate_scene.py   export_cesium.py   两个入口         │
 │   tools/scene_digest.py                  结构摘要工具      │
@@ -121,7 +121,7 @@
 
 | 文件 | 行数 | 层 |
 |---|---|---|
-| `generate_scene.py` | 899 | bpy · 入口 |
+| `generate_scene.py` | 869 | bpy · 入口 |
 | `export_cesium.py` | 647 | bpy · 入口 |
 | `osmassets/tree.py` | 318 | bpy |
 | `osmassets/geom.py` | 241 | 纯 |
@@ -129,7 +129,7 @@
 | `osmassets/catalog.py` | 197 | 纯 |
 | `osmassets/mesh.py` | 126 | bpy |
 | `osmassets/osm.py` | 89 | 纯 |
-| `osmassets/building.py` / `fountain.py` | 56 / 49 | bpy |
+| `osmassets/building.py` / `fountain.py` / `roads.py` | 56 / 49 / 40 | bpy |
 | `osmassets/water.py` / `grass.py` / `scrub.py` | 15 / 22 / 13 | bpy |
 | `tools/scene_digest.py` | 171 | bpy · 工具 |
 | `tests/test_pure.py` | 372 | 纯 · 测试 |