//===========================================================================package vsdk.toolkit.common;import vsdk.toolkit.common.Vector3D;import vsdk.toolkit.common.VSDK;public class Ray  extends FundamentalEntity{    /// Check the general attribute description in superclass Entity.    public static final long serialVersionUID = 20060502L;    public Vector3D origin;    public Vector3D direction;    public double t;    public Ray(Vector3D origin, Vector3D direction)    {        this.origin = new Vector3D(origin.x, origin.y, origin.z);        this.direction = new Vector3D(direction.x, direction.y, direction.z);        this.direction.normalize();    }    public Ray(Ray b)    {        origin = new Vector3D(b.origin);        direction = new Vector3D(b.direction);        t = b.t;    }    public void clone(Ray other)    {        this.origin.clone(other.origin);        this.direction.clone(other.direction);        this.t = other.t;    }    /**    Provides an object to text report convertion, optimized for human    readability and debugging. Do not use for serialization or persistence    purposes.    */    public String toString()    {        return "Ray Origin: " + origin + "; Direction: " + direction + " T: " + VSDK.formatDouble(t);    }}//===========================================================================//= EOF                                                                     =//===========================================================================