In computer graphics all surfaces can be represented as in their quadratic form with the help of mathematical equations.these are described with second degree equations.

Quadric surfaces: The zero set of a polynomial P(X) = P (X1. . . Xn) ∈Q[X1, . . . ,Xn] is a hyper surface in n-dimensional affine space (either real or complex). When P(X) is homogeneous, it is called a form and defines a hypersurface in (n − 1)-dimensional projective space. When deg(P) = 2, the polynomial is quadratic and the corresponding hypersurface is quadric. We shall reserve the term “surface” for 3-dimensional affine or projective hypersurface.