This is also a great way of adding second skin textures to your figure, without having to bother with extra programs or editing in photoshop. It's particularly useful if the second skin you want to use does not follow the standard material zones of the figures. And if you're using a utility like ShaderSpider, you can even save the wedge to use in the future, so you only have to perform the node settings once and save the wedge; later on, you can just apply it with a single click to any base texture you're using.

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