3D Quadratic

A general quadratic equation in three variables:

f(x,y,z)= A100 x + A200 x^2 + A010 y + A020 y^2 + A001 z + A002 z^2 + A110 x y + A101 x z + A011 y z

This family includes planes, ellipsoids, hyperboloids, cones, cylinders, etc.

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