仅当使用的着色器或子着色器的细节级别 (LOD) 值低于指定数字时,着色器 LOD 才有效。
默认情况下,允许的 LOD 级别无限大,因此可以使用用户硬件支持的所有着色器。但在某些情况下,即使硬件可以支持更高的着色器细节级别,您也可能希望降低细节级别。例如,一些廉价的显卡可能支持所有功能,但使用起来会导致响应过慢。因此,您可能不希望在这些显卡上使用视差法线贴图。
可为各个着色器分别设置着色器 LOD(使用 Shader.maximumLOD),也可为所有着色器进行全局设置(使用 Shader.globalMaximumLOD)。
在自定义着色器中,使用 LOD 命令可设置任何子着色器的 LOD 值。
Unity 中的内置着色器按以下方式设置 LOD:
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