Hello,
i try to pick one of my object but it doesn t work. Maybe the overlaping of the cubes prevents me from picking. If one object is
picked,  i have a message but it never happens.I don t know why.

here the code :

int samples = 20;
PImage b;
PVector [][]pos = new PVector[samples][samples];
float a1 = 10., a2 = 10., a3 = 10.;
float u1 = 0., u2 = 20., v1 = 0., v2 = 20.;
float dU = (u2 - u1) / samples;
float dV = (v2 - v1) / samples;
float n = 1., e = 1.;

void setup(){
 background(0);
size(500,500, P3D);
 directionalLight(126, 126, 126, 0, 0, -1);
camera(-15,15,-20,0,0,0,0,0,1);
}

void move(){
 float u = u1;
  for(int i=0; i<samples; i++){
   float v = v1;
   for(int j=0; j<samples; j++){
     float x = a1 * sqCos (u, n) * sqCos (v, e);
     float y = a2 * sqCos (u, n) * sqSin (v, e);
     float z = a3 * sqSin (u, n);
     pos[i][j] = new PVector(x, y, z);
   
   v += dV;
     }
   u += dU;
}}
 
void draw(){
background(0);
  // rotateY(frameCount * 0.01);
   move();
   for(int i=0; i<samples; i++){
    for(int j=0; j<samples; j++){
      pos[i][j].display();
}}}

float sign ( float x ) {
 if ( x < 0 )return -1;
 if ( x > 0 )return 1;
 return 0;
}
float sqSin( float v, float n ) {
 return sign(sin(v)) * pow(abs(sin(v)),n);
}
float sqCos( float v, float n ) {
 return sign(cos(v)) * pow(abs(cos(v)),n);
}

void mousePressed(){
 for(int i=0; i<samples; i++){
  for(int j=0; j<samples; j++){
   pos[i][j].pick(mouseX,mouseY); //pick an object
}}}

class PVector{
float x, y, z;
boolean picked = false;
 
 
 PVector(float xInput, float yInput, float zInput){
  x = xInput;
  y = yInput;
  z = zInput;
 }

void pick(float xp, float yp){
   for(int i=0; i<samples; i++){
    for(int j=0; j<samples; j++){
 if(dist(xp,yp,screenX(pos[i][j].x,pos[i][j].y,pos[i][j].z),screenY(pos[i][j].x,pos[i][j].y,pos[i][j].z))<10)
     picked = true;
   else
     picked = false;
 }}
//println(pos[1][10].x);
}

void display(){
 if(picked==true) //if picked
     println("picked"); // then write picked
   else
     //println("unPicked"); // else write unPicked    
 
 pushMatrix();
     translate(x, y, z);
       box(1);
     popMatrix();
}

}