constructor (eye, center, up, fov)
    {
        this.eye = eye;
        this.center = center;
        this.up = up;
        this.fov = fov;
    }
@param {Coord3D} eye Eye position.
@param {Coord3D} center Center position. Sometimes it's called target or look at position.
@param {Coord3D} up Up vector.
@param {number} fov Field of view in degrees.