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Unity 2021 Shaders and Effects Cookbook
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Anisotropic is a type of Specular or reflection that simulates the directionality of grooves in a surface and modifies/stretches the Specular in a perpendicular direction. This is very useful when you want to simulate brushed metals, not metals with a clear, smooth, and polished surface. Imagine the Specular that you see when you look at the data side of a CD or DVD or the way the Specular is shaped at the bottom of a pot or pan. Note that if you carefully examine the surface, there is a direction to the grooves, usually in the way that the metal was brushed. When you apply a Specular to this surface, you get a Specular stretched in a perpendicular direction.
This recipe will introduce you to the concept of augmenting your Specular highlights to achieve different types of brushed surfaces. In future recipes, we will look at the various ways in which we can use the concepts of this recipe to achieve other effects, such as stretched reflections...