| vertexCount | 要分配的顶点数。最大值为 65535（或 UInt16.MaxValue）。 |
| indexCount | 要分配的三角形列表索引数。每 3 个索引表示一个三角形，因此此值应为 3 的倍数。 |
| texture | 要应用于分配的三角形的可选纹理。传递 null 以仅依赖顶点颜色。 |
MeshWriteData 一个对象，提供对新分配数据的访问权限。如果返回的顶点数为 0，则分配失败（系统内存不足）。
分配并绘制表达 VisualElement 内容几何图形所需的指定数量的顶点和索引。
有关几何图形生成约定，请参阅 Vertex.position。如果传递了有效的纹理，则返回的 MeshWriteData 还将描述一个用于采样传递纹理的 UV 的矩形。这是必需的，因为传递给此 API 的纹理可以在内部复制到更大的图集中。
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