Clicking on the Clips icon brings up the Clips Feature Panel, the Creation section of which offers access to a General quadric clip type. It is possible to create a 3D Quadric clip using the General Quadric option by directly specifying the coefficients of a general quadric equation.
These coefficient values represent the general equation of a Quadric surface. They can be changed by modifying the coefficient values. No tool exists corresponding to this equation.
AX 2+BY 2+CZ 2+DXY+EYZ+FXZ+GX+HY+IZ=J