How can i make this skech faster ? i think i have to reduce the draw() part but i am not able to do that. I don't manage to do it.
How can i do ? It is composed of a superquadric form which can be changed with controls. i think it is a bit slow. Here the code :

int samples = 20;
PImage b;
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(screen.width,screen.height, P3D);
 //size(500,500, P3D); //setup the screen size(screen.width,screen.height, P3D);
 //ambientLight(51, 102, 126);
directionalLight(126, 126, 126, 0, 0, -1);
ambientLight(102, 102, 102);
camera(-15,15,-20,0,0,0,0,0,1); //get a viewpoint
b = loadImage("wormhole.png");
}


void draw(){
background(0);
   
    rotateY(frameCount * 0.01);
 
  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);
   pushMatrix();
   translate(x, y, z);
  image(b, 0, 0, 1, 1);
  popMatrix();
     v += dV;
     }
   u += dU;

}}

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 keyPressed() {
 if (key == CODED) {
   if (keyCode == UP) {
     n = 3.;
     e = 3.;
   }
if (keyCode == LEFT) {
     n = 1.;
     e = 1.;
   }
if (keyCode == RIGHT) {
     n = -0.2;
     e = 1.;
   }
if (keyCode == DOWN) {
     n = 1;
     e = 0.3;
   }
}
}

Hello ramin,

great it is faster ! but i have got a new problem, now my control
doesn t work at all. Maybe my  calculation is closed because it is in my setup part. So we can t modify them. How can i modify the calcul in my setup part (bold in the follow sketch) in order to make my control work ? 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.;
//float x, y, z;
void setup(){
 background(0);
 //size(screen.width,screen.height, P3D);
 size(500,500, P3D);
 //ambientLight(51, 102, 126);
directionalLight(126, 126, 126, 0, 0, -1);
camera(-15,15,-20,0,0,0,0,0,1); //get a viewpoint
// Images must be in the "data" directory to load correctly
//b = loadImage("berlin-1.jpg");
//b = loadImage("wormhole.png");

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);
   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 keyPressed() {
 if (key == CODED) {
   if (keyCode == UP) {
     n = 3.;
     e = 3.;
   }
if (keyCode == LEFT) {
     n = 1.;
     e = 1.;
   }
if (keyCode == RIGHT) {
     n = -0.2;
     e = 1.;
   }
if (keyCode == DOWN) {
     n = 1;
     e = 0.3;
   }
}
}