#include "TMath.h"
#include "TPolyLine3D.h"

TView3D * small_squares()
{
	TCanvas * c = new TCanvas("cc", "cc", 500,100, 600, 600);
   Double_t rx0 = -10, rx1 = 10, ry0 = -10, ry1 = 10, rz0 = -10, rz1 = 10;
   Double_t rmin[3], rmax[3];
   rmin[0] = rx0;
   rmin[1] = ry0;
   rmin[2] = rz0;
   rmax[0] = rx1;
   rmax[1] = ry1;
   rmax[2] = rz1;

   TView3D *view = new TView3D(1, rmin, rmax);
	Double_t x[5], y[5], z[5];
	Double_t x0 = 0, y0=0, z0=0, x1 = 8, y1=8, z1=8;

	TPolyLine3D *pl;
	for (Int_t i=0; i<16; i++) {
		x[0]=x0; x[1]=x1; x[2]=x1; x[3]=x0; x[4]=x0;
		y[0]=y0; y[1]=y0; y[2]=y1; y[3]=y1; y[4]=y0;
		z[0]=z0; z[1]=z1; z[2]=z1; z[3]=z0; z[4]=z0;
		pl=new TPolyLine3D(5, x, y, z);
		pl->SetLineColor(i%4+1);
		pl->SetLineWidth(2);
		pl->Draw();
		x1 /= 2;
		y1 /= 2;
		z1 /= 2;
	}
//	view->ZoomView(gPad, 16);
	c->Modified();
	c->Update();
	return view;
}