distance method
Returns the distance between two coordinates.
@param {goog.math.Coordinate3} b A Coordinate3. @return {number} The distance between {@code a} and {@code b}.
Implementation
double distance(Coordinate3 b)
{
double dx = this.x - b.x;
double dy = this.y - b.y;
double dz = this.z - b.z;
return Math.sqrt(dx * dx + dy * dy + dz * dz);
}