import java.awt.Color;
import java.util.*;

/**
 *
 *   An instructional Ray-Tracing Renderer written
 *   for MIT 6.837  Fall '98 by Leonard McMillan.
 *
 */

// An object must implement a Renderable interface in order to
// be ray traced. Using this interface it is straight forward
// to add new objects
abstract interface Renderable {
  public abstract boolean intersect(Ray r);
  public abstract Color Shade(Ray r, Vector lights, Vector objects, Color bgnd, int depth);
  public String toString();
}