public class Ray{
    Vector v;
    Vector w;
    int howManyRefl;
    double n1;// refraction index
    int index;// if the ray is inside an object, this is the index of the object

    public Ray(Vector vs, Vector ws, double r){
	v=new Vector(vs);
	w=new Vector(ws);
	howManyRefl=2;
	n1=r;
    }

    public Ray(Ray rs){
	v=new Vector(rs.v);
	w=new Vector(rs.w);
	n1=rs.n1;
	howManyRefl=rs.howManyRefl;
    }

    public void setIndex(int i){
	index=i;
    }


    public void setRefl(int i){
	howManyRefl=i;
    }

    public void setN1(double d){
	n1=d;
    }


    public double[] rayTraceSurf(Surface[] objects, Light[] lights){

	double t=10000;
	int ind=-1;
	double[] res=new double[3];
	for (int i=0; i< objects.length; i++){
	    double[] tmptc=objects[i].intersections(v.v,w.v);
	    double tc=tmptc[0];
	    double tc1=tmptc[1];

	    if (tc>=tc1) continue;
	    if (tc<=t & tc>=0){
		t=tc;
		ind=i;
		
	    }
	}
	if (ind>=0){
	    //res=objects[ind].shade(L,v,w,t);// add fields in sphere to keep values of the intersection and "prepare" shading if it is indeed shaded
	    // you have to set the index of the objects at some point...	 

	    res=objects[ind].shade(objects,lights,this,t,0);// add fields in sphere to keep values of the intersection and "prepare" shading if it is indeed shaded
	    //res=objects[ind].shadeSimple(objects,lights,this,t);
	}
	return res;
    }

    public double[] rayIn(Surface[] objects, Light[] lights){
	double t=10000;
	int ind=-1;
	double[] res=new double[3];
	int flagIn=1;
	for (int i=0; i< objects.length; i++){
	    double[] tmptc=objects[i].intersections(v.v,w.v);
	    double tc=tmptc[0];
	    double tc1=tmptc[1];
	    if (tc>=tc1) continue;
	    if (tc<=t & tc>=0){
		t=tc;
		ind=i;
		flagIn=1;
		
	    }
	    if (i==index & tc1<=t){
		t=tc1;
		ind=i;
		flagIn=2;
	    }
	}
	if (ind>=0){
	    res=objects[ind].shade(objects,lights,this,t,flagIn);// add fields in sphere to keep values of the intersection and "prepare" shading if it is indeed shaded
	}
	return res;
    }


}