| 释义 |
projection (of a point on a line or plane) Given a line l (resp. a plane Π) and a point P not on l (resp. Π), the projection of P on l (resp. Π) is the point N on l (resp. Π) such that PN is perpendicular to l (resp. Π). The length |PN| is the minimal distance from P to any point of l (resp. Π). The point N is called the foot of the perpendicular from P to l (resp. Π). This map from points P to l (or Π) is called orthogonal projection. See also vector projection.
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