@Override
    public Rectangle clone() {
        try {
            Rectangle r = (Rectangle) super.clone();
            r.a = a.clone();
            r.b = b.clone();
            r.c = c.clone();
            return r;
        } catch (CloneNotSupportedException e) {
            throw new AssertionError();
        }
    }
Create a copy of this rectangle.

@return a new instance, equivalent to this one
jme3-core/src/main/java/com/jme3/math/Rectangle.java