

double point_vs_plane ( SS_XYZ *p, SS_COEF *coef )
SS_XYZ *p; // address of a 3D point SS_COEF *coef; // address of plane structure



Synopsis 
#include "silver.h"
The point_vs_plane function compares point p with the plane specified by coef .


Parameters 
p is the address of a 3D point. coef is the address of an SS_COEF struct which holds the representation of the plane equation.


Return Value 
point_vs_plane returns a value such that:
1. The absolute value of the value returned by point_vs_plane is the distance of p from the plane if coef is normalized.
2. A negative value indicates that the point lies on the negative side of the plane.
3. If the distance of p from the plane is less than epsilon (the system equality threshold), then 0.0 is returned 


