Node: Planes Constructors, Next: , Previous: Planes Global Constants, Up: Plane Reference

### Constructors

 void Plane (void) Default constructor
 Creates a degenerate Plane with point == normal == origin, and distance == 0. Planes constructed using this constructor will probably be set using the assignment operator or Path::get_plane() immediately, or very soon after being declared. See Planes Reference; Operators, and Paths Reference; Querying.

 void Plane (const Plane& p) Copy constructor
 Creates a new Plane, making it a copy of p.

 void Plane (const Point& p, const Point& n) Constructor
 If p is not equal to n, this constructor creates a Plane and sets point to p. normal is set to n, and made a unit vector. distance is calculated according to the following formula: Let n stand for normal, p for point, and d for distance: d = -p \dot n. If d = 0, origin lies in the Plane. If d > 0, origin lies on the side of the Plane that normal points to, considered to be "outside". If d<0, origin lies on the side of the Plane that normal does not point to, considered to be "inside". However, if p == n, point and normal are both set to INVALID_POINT, and distance is set to INVALID_REAL, i.e., *this will be equal to INVALID_PLANE (see Planes Reference; Global Constants).  Point P(1, 1, 1); Point N(0, 1); N.rotate(-35, 30, 20); N.show("N:"); -| N: (-0.549659, 0.671664, 0.496732) Plane q(P, N); cout << q.distance; -| -0.618736 Fig. 105.