private static Point4d findPivotPoint(Point4d a4, Point4d b4)
{
Vector3 a = new Vector3();
Vector3 b = new Vector3();
a = Point4d.projectAndGetVect3(a4);
b = Point4d.projectAndGetVect3(b4);
Vector3 a_minus_b = new Vector3(a.x - b.x, a.y - b.y, a.z - b.z);
float p = HyperbolicMath.dotProduct(a, a_minus_b);
float q = HyperbolicMath.dotProduct(b, a_minus_b);
float r = HyperbolicMath.dotProduct(a_minus_b, a_minus_b);
return(new Point4d(p * b.x - q * a.x,
p * b.y - q * a.y,
p * b.z - q * a.z,
r));
}
