Quadric surfaces 二次曲面

Quadric surfaces
In mathematics, a quadric, or quadric surface, is any D-dimensional hypersurface in (D + 1)-dimensional space defined as the locus of zeros of a quadratic polynomial.


hyperbola 双曲线 hyperboloid 双曲面；双曲线体
parabola  抛物线 paraboloid 抛物面
ellipse 椭圆 ellipsoid 椭圆体
cylinder 圆柱


1. EDG
2. Quadric@Wikipedia