public class light{
	double dir[]=new double[3];
	double rgb[]=new double[3];

	void setRgb(double rgbs[]){
		rgb[0]=rgbs[0];
		rgb[1]=rgbs[1];
		rgb[2]=rgbs[2];
	}
	void setDir(double dirs[]){
		dir[0]=dirs[0];
		dir[1]=dirs[1];
		dir[2]=dirs[2];
		dir=normalize(dir);
	}

	
	public double[] normalize(double[] vs){
		int n=vs.length;
		double norm=0;
		for (int i=0; i<n; ++i){
			norm+=vs[i]*vs[i];
		}
		double[] res=new double[n];
		if(norm!=0)
			for (int i=0; i<n; ++i){
				res[i]=vs[i]/Math.sqrt(norm);
			}
		return res;
	}



 
}