void pl2nvp_c ( ConstSpicePlane * plane,
SpiceDouble normal[3],
SpiceDouble point [3] )
Return a unit normal vector and point that define a specified
plane.
PLANES
GEOMETRY
MATH
PLANE
Variable I/O Description
  
plane I A CSPICE plane.
normal,
point O A unit normal vector and point that define plane.
plane is a CSPICE plane.
normal,
point are, respectively, a unit normal vector and point
that define the geometric plane represented by
plane. Let the symbol < a, b > indicate the inner
product of vectors a and b; then the geometric
plane is the set of vectors x in threedimensional
space that satisfy
< x  point, normal > = 0.
point is always the closest point in the input
plane to the origin. point is always a
nonnegative scalar multiple of normal.
None.
Error free.
1) The input plane MUST have been created by one of the CSPICE
routines
nvc2pl_c ( Normal vector and constant to plane )
nvp2pl_c ( Normal vector and point to plane )
psv2pl_c ( Point and spanning vectors to plane )
Otherwise, the results of this routine are unpredictable.
None.
CSPICE geometry routines that deal with planes use the `plane'
data type to represent input and output planes. This data type
makes the subroutine interfaces simpler and more uniform.
The CSPICE routines that produce CSPICE planes from data that
define a plane are:
nvc2pl_c ( Normal vector and constant to plane )
nvp2pl_c ( Normal vector and point to plane )
psv2pl_c ( Point and spanning vectors to plane )
The CSPICE routines that convert CSPICE planes to data that
define a plane are:
pl2nvc_c ( Plane to normal vector and constant )
pl2nvp_c ( Plane to normal vector and point )
pl2psv_c ( Plane to point and spanning vectors )
1) Given a plane normal and constant, find a point in
the plane. point is the point we seek.
nvc2pl_c ( normal, const, &plane );
pl2nvp_c ( &plane, normal, point );
None.
[1] `Calculus and Analytic Geometry', Thomas and Finney.
N.J. Bachman (JPL)
CSPICE Version 1.0.0, 05MAR1999 (NJB)
plane to normal vector and point
