是否可以通过脚本访问网格顶点和索引?
将网格变为可读会在内存中保留它的两个副本,一个用于渲染,
另一个留在系统内存中便于脚本访问。因此,将 isReadable 设置为 false 可节省内存。
沿着三个轴对网格进行不同数量的缩放(即非一致缩放)时,
需要网格是可读的,以便实现正确的光照。
只要 Unity 编辑器不处于播放模式,就始终可以访问。
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