使用 Simple 光照探针插值。
如果场景中显示烘焙光照探针，将为此对象计算插值光照探针，并设置为内置着色器 uniform 变量。表面着色器会自动使用此信息。要为您的自定义非表面着色器添加光照探针贡献，请在顶点或像素着色器中使用 ShadeSH9(worldSpaceNormal)。
另请参阅：Light Probes。
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