指定纹理红色通道数据的来源。
默认情况下，导入纹理的红色通道值来自源图像的红色通道。要重新排序或反转导入时的颜色通道，请将其更改为 TextureImporterSwizzle 的其他值。
其他资源：TextureImporterSwizzle、swizzleG、swizzleB、swizzleA。
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