/** Light source
 * Simple version, color and direction only
 * (could be point in scene instead, may complicate shadow rays in grid?)
 * @author: Phil Gage
 */
class Light {
//    public static Color background = new Color(0.0,0.0,0.5); //sky?
    public static Color ambient = new Color(0.0,0.0,0.0);  //?
    Color color;
    Vector3 direction;
//    Point location;   // or position?

    Light (Vector3 direction, Color color) {
//    Light (Point location, Color color) {
        this.color = new Color(color);
        this.direction = new Vector3(direction);
        this.direction.normalize();
//        this.location = new Point(location);
    }

    /** Override to change light for animation frames */
    boolean animate (int frame) {
        // hard to do with Jevans alg, slow complete redraw?
        // or put light inside grid and set voxel changed flags?
        return false;    // return true if object changed
    }

}