NAME

M_Line —

Agar-Math plane structure

SYNOPSIS

#include <agar/math.h>

DESCRIPTION

The M_Plane structure describes a plane in R^3 (Ax+By+Cz+D=0):

typedef struct m_plane {
	M_Vector3 n;		/* Normal vector */
	M_Real d;		/* Distance to origin */
} M_Plane;

The plane satisfies the equation A(n.x) + B(n.y) + C(n.z) = d.

INITIALIZATION

M_Plane
M_PlaneFromPts(M_Vector3 p1, M_Vector p2, M_Vector p3);

M_Plane
M_PlaneFromParallel(M_Plane P, M_Real d);

M_Plane
M_PlaneRead(AG_DataSource *ds);

void
M_PlaneWrite(AG_DataSource *ds, M_Plane *P);

M_Plane
M_PLANE_INITIALIZER(M_Real a, M_Real b, M_Real c, M_Real d);

The M_PlaneFromPts() function returns a plane from three (non-colinear) points p1, p2 and p3. M_PlaneFromParallel() returns the parallel plane at distance d from the specified plane P.

The M_PlaneRead() and M_PlaneWrite() functions read or write a plane structure from/to an AG_DataSource(3).

The macro M_PLANE_INITIALIZER() expands to a static initializer for a M_Plane from the coefficients of the plane equation a, b, c, d.

TESTS

M_Real
M_PlaneVectorAngle(M_Plane P, M_Vector3 v);

The M_PlaneVectorAngle() function computes the angle between the plane and specified vector, in radians.

HISTORY

The M_Line structure first appeared in Agar 1.3.4.