5.3.2 Quadric
The syntax of the quadric object is:
QUADRIC:
quadric { COEFF1, COEFF2, COEFF3, COEFF4 [OBJECT_MODIFIERS] }
See also:
It describes a quadric (surface given by a quadratic polynomial in the
variables , and ) with
coefficients COEFF1(
) of the homogeneous quadratic part,
coefficients COEFF2(
) of the inhomogeneous quadratic part,
coefficients COEFF3(
) of the homogeneous linear part
and constant coefficient COEFF4()
given by
Note the unusual order of COEFF2!
As particular cases we get
ellipsoids, paraboloids, hyperboloids, and the degenerated cases of
cylinders, double cones, etc. ...
Figure:
Hyperboloids
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Andreas Kriegl 2003-07-23