指示可见于绘制指令的分割。
Unity 在同时剔除阴影贴图分割时使用此功能。分割是指方向光阴影贴图中的阴影级联或者点光阴影贴图中的立方体贴图面。
这是一个 8 位位域，其中值 1 表示 Unity 应在分割中渲染绘制指令，值 0 表示 Unity 不应在分割中渲染绘制指令。最低有效位对应于第一个剔除分割（数组索引 0），每个连续的位对应于下一个剔除分割，最多有六个位。
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