Light on 3d Box with mousePressed in Processing

void setup() {

  size(500,500,P3D);

  noStroke();

 

}

 

 

void draw() {

  

  background(0);

  fill(255);

  translate(width/2,height/2,0);

    if(mousePressed)

 {

 lights();

 

 }

  rotateX(4);

  

  rotateY(-0.4);

  box(100);

   

}