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Signed Distance Fields (SDFs), also known as implicit surfaces, are a mathematical way to define 3D objects. If polygons and rasterization are like imperative programming, then SDFs are (literally) the functional paradigm for graphics. In this paradigm, an object can be defined by a function that computes a signed distance to the surface of the object, where the distance is positive outside of the object, zero at its surface, and negative inside the object.
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