public static CNCVector GetPerpendicularVector(CNCVector vt1, CNCVector vt2)
{
double a = vt1.b * vt2.c - vt1.c * vt2.b;
double b = -(vt1.a * vt2.c - vt1.c * vt1.a);
double c = vt1.a * vt2.b - vt1.b * vt2.a;
return(new CNCVector(a, b, c));
}
public CNCPlane(CNCPoint pt1, CNCPoint pt2, CNCPoint pt3)
{
CNCVector vt1 = new CNCVector(pt1, pt2);
CNCVector vt2 = new CNCVector(pt1, pt3);
CNCVector perpVt = CNCVector.GetPerpendicularVector(vt1, vt2);
this.a = perpVt.a;
this.b = perpVt.b;
this.c = perpVt.c;
this.d = pt1.x * a + pt1.y * b + pt1.z * c;
}