UsePass 命令使用来自另一个着色器的指定通道。
UsePass "Shader/Name"
插入来自给定着色器的具有给定名称的所有通道。Shader/Name 包含着色器名称和通道名称,以斜杠字符分隔。请注意,系统只会考虑第一个受支持的子着色器。
一些着色器可能会重复使用其他着色器中的现有通道,从而减少代码复制工作。例如,您可能有一个绘制对象轮廓的着色器通道,并希望在其他着色器中重复使用该通道。UsePass 命令就能实现您的愿望,该命令可包含来自其他着色器的指定通道。例如,以下命令使用来自内置 VertexLit 着色器的名为“SHADOWCASTER”的通道:
UsePass "VertexLit/SHADOWCASTER"
要让 UsePass 运行,必须为要使用的通道提供一个名称。通道中的 Name 命令可为通道提供名称:
Name "MyPassName"
请注意:在内部,所有通道名称均大写,因此 UsePass 必须引用大写名称。
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