/** Top class for rendered objects
 * @author: Phil Gage
 */
abstract class AbstractObject {

    /** Surface properties */
    Material material;

    /** Optional grid mailbox for acceleration */
    long rayId;
    double rayDistance;
    Intersection rayIntersection;  //temp

    /** Create an object */
    AbstractObject (Color color) {
        material = new Material (color);
        rayIntersection = new Intersection ();  //temp
    }

    void setColor (Color color) {
        this.material.color = color;
    }

    void setMaterial (Material material) {
        this.material = material;
    }

    /** Return intersection distance, negative if none,
        and set intersection parameters */
    abstract double intersect (Ray ray, Intersection intersection);

    /** Return color at a point using surface texture */
    Color getColor (Point point) {
        return material.getColor(point);
    }

    /** Override to transform object for animation frames */
    boolean animate (int frame) {
        return false;    // return true if object changed
    }

    /** Return bounding box around this object,
        this should be recomputed each time due to animation */
    abstract Extent getExtent ();

}