@Override
    public String toString() {
        return getClass().getSimpleName() + " [Origin: " + origin + ", Direction: " + direction + "]";
    }
Represent this ray as a String.  The format is:

Ray [Origin: (X.X, Y.Y, Z.Z), Direction: (X.X, Y.Y, Z.Z)]

@return a descriptive string of text (not null, not empty)
jme3-core/src/main/java/com/jme3/math/Ray.java