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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