表示为绘制 VisualElement 的内容而分配的顶点和索引数据的类。
只能在对 VisualElement.generateVisualContent 委托进行回调过程中使用此对象填充顶点和索引的值。不要存储超出 VisualElement.generateVisualContent 范围的已传递 MeshWriteData，因为 Unity 可回收它，以用于其他回调。
| indexCount | 为 VisualElement 内容绘制而成功调用的索引数量。 |
| uvRegion | 描述保留传递到 MeshGenerationContext.Allocate 的纹理的 UV 区域的矩形。 |
| vertexCount | 为 VisualElement 内容绘制而成功调用的顶点数量。 |
| SetAllIndices | 通过直接从数组中复制已分配索引的值来填充这些值。每 3 个连续顶点可形成一个三角形。 |
| SetAllVertices | 要从中进行复制的顶点的数组。该数组的长度必须与分配的顶点数量一致。 |
| SetNextIndex | 分配已分配索引列表的下一个索引的值。 |
| SetNextVertex | 分配已分配顶点列表的下一个顶点的值。 |
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