光照探针着色器 uniform 值提取自为此渲染器设置的材质属性块。
如果属性 unity_SHBb、unity_SHBb、unity_SHBb、unity_SHBb、unity_SHBb、unity_SHBb 和 unity_SHC 不是此 MaterialPropertyBlock 的一部分，将设置为零。\
如果属性 unity_ProbesOcclusion 不是此 MaterialPropertyBlock 的一部分，将以在法线光照中的方式计算。
请注意，在不同位置使用烘焙光照探针值可能会导致渲染错误，特别是在使用局部光照（例如点光源和聚光灯）时。在使用 Graphics.DrawMeshInstanced 绘制实例化对象时（这时光照探针数据经过预先计算并以数组形式提供），这种模式更为有用。
另请参阅：MaterialPropertyBlock、MaterialPropertyBlock.CopySHCoefficientArraysFrom、MaterialPropertyBlock.CopyProbeOcclusionArrayFrom。
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