BImage acc;
	int nivmax;
	float xc, yc, zc,buta,angly;
	Decoupe limage;
	float tempo;
	boolean stop;
	
	void setup() {
		size(500, 500);
		xc= width/2.0f;
		yc=height/2.0f;
		zc=-400f;
		nivmax=5;
		stop=true;angly=0;	
		background(90,40,65);		
		acc= new BImage();
		acc=loadImage("bb.jpg");
		limage=new Decoupe(acc);
		
	}
	void loop() {
		//delay(30);
		clear();
		translate(xc, yc, zc);
		buta=0.01f * (mouseX - width/2);
		angly+=0.1f*cos(buta);
		rotateY(angly);
		rotateZ(PI);			
		if(!stop)tempo += 0.05;	
		scale(1.2f);	
		limage.dessiner(0,0,0);
		
	}
void mousePressed(){stop=!stop;
}

	
//*****************************************************************	
 class Decoupe{

BImage img;
BImage[] quart;
float diag;
int w;
public Decoupe(BImage img){
	this.img=img;
	quart=new BImage[4];
	 w=img.width/2;
	 diag=w*sqrt(0.5f);
}
	
public void  dessiner(float x,float y,int niv){
	noStroke();//stroke(155,130,50);
	float wn=w/pow(2,niv);
	float diagn=diag/pow(2,niv);
	fill(255,120);
	beginShape(QUADS);
		texture(acc);	
			vertex(0,2*diagn,0, x,       y        );
			 vertex(2*diagn,0,0, x+2*wn, y       );
			 vertex(0,-2*diagn,0, x+2*wn, y+2*wn );
			vertex(-2*diagn,0,0, x,       y+2*wn );
		endShape(); 
	fill(255);	
	push();
	translate(0,2*diagn,0);
	rotateX(-tempo);
	//line(-diagn,0,0,diagn,0,0);
	if(niv<nivmax){	translate(0,-diagn,0);dessiner(x,y,niv+1);}
	else{	
	beginShape(QUADS);
	texture(acc);	
		vertex(0,0,0, x,       y        );
		 vertex(diagn,-diagn,0, x+wn, y       );
		 vertex(0,-2*diagn,0, x+wn, y+wn );
		vertex(-diagn,-diagn,0, x,       y+wn );
	endShape(); 
	}
	pop();
	
	push();

	translate(2*diagn,0,0);	
	rotateY(tempo);
	//line(0,-diagn,0,0,diagn,0);
	if(niv<nivmax){	translate(-diagn,0,0);dessiner(x+wn,y,niv+1);}
	else{
	beginShape(QUADS);
	texture(acc);
	vertex(-diagn,diagn,0, x+wn,y);	
		vertex(0,0,0,x+2*wn,y);
		 vertex(-diagn,-diagn,0, x+2*wn,y+wn);
		 vertex(-2*diagn,0,0, x+wn,y+wn);
		
	endShape(); 		 
	}
	pop();
	
	push();
	
	translate(0,-2*diagn,0);	
	rotateX(tempo);
	//line(-diagn,0,0,diagn,0,0);
	if(niv<nivmax){	translate(0,diagn,0);dessiner(x+wn,y+wn,niv+1);}
	else{
	beginShape(QUADS);
	texture(acc);
	vertex(0,2*diagn,0, x+wn,y+wn);
	vertex(diagn,diagn,0,x+2*wn,y+wn);

		 vertex(0,0,0, x+2*wn,y+2*wn);
		vertex(-diagn,diagn,0, x+wn,y+2*wn);	
	endShape(); 
	}
	pop();	
	
	push();
	
	translate(-2*diagn,0,0);	
	rotateY(-tempo);
	//line(0,-diagn,0,0,diagn,0);
	if(niv<nivmax){	translate(diagn,0,0);	dessiner(x,y+wn,niv+1);}
	else{
	beginShape(QUADS);
	texture(acc);
		 vertex(diagn,diagn,0, x,y+wn);	
		vertex(2*diagn,0,0,x+wn,y+wn);
		vertex(diagn,-diagn,0, x+wn,y+2*wn);
		 vertex(0,0,0,x,y+2*wn);
		
	endShape(); 
	} 
	pop();	  
}
	
}