// Compute illumination due to reflection
        if (kr > 0) {
            float t = v.dot(n);
            if (t > 0) {
                t *= 2;
                Vector3D reflect = new Vector3D(t*n.x - v.x,
                                                t*n.y - v.y,
                                                t*n.z - v.z);
                Vector3D poffset = new Vector3D(p.x + TINY*reflect.x,
                                                p.y + TINY*reflect.y,
                                                p.z + TINY*reflect.z);
                Ray reflectedRay = new Ray(poffset, reflect);
                if (reflectedRay.trace(objects)) {
                    Color rcolor = reflectedRay.Shade(lights, objects, bgnd);
                    r += kr*rcolor.getRed();
                    g += kr*rcolor.getGreen();
                    b += kr*rcolor.getBlue();
                } else {
                    r += kr*bgnd.getRed();
                    g += kr*bgnd.getGreen();
                    b += kr*bgnd.getBlue();
                }
            }
        }