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A collective term referring to geometric primitives whose surfaces can be described by an implicit function. These will often be algebraic surfaces, that is, surfaces that can be described with a polynomial equation in terms of their coordinates. The most common surfaces of this class are the quadric surfaces. Though surfaces may have a natural implicit form, in practice, it is often more convenient to adopt a parametric representation. In the rendering library, all quadric primitives and the torus primitive are implicit.
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