| name | 属性的名称。 |
获取纹理 propertyName 的位置偏移。
Common texture names used by Unity's builtin shaders:
"_MainTex" is the main diffuse texture. This can also be accessed via mainTextureOffset property.
"_BumpMap" is the normal map.
"_Cube" is the reflection cubemap.
另请参阅：mainTextureOffset 属性、SetTextureOffset。