Endless tunnel - OpenProcessing

TunnelJS
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float zDist = 11, zmin = -150, zmax = 250, zstep = 2.8, rad = 200;
int nb = int((zmax - zmin) / zDist);
PVector[] circles = new PVector[nb];
color[] colors = new color[nb];
Boolean bnw = true, dots = false;
​
void setup() {
  size(600, 400, P3D);
  noFill();
  strokeWeight(2);
  colorMode(HSB);
  for (int i = 0; i < nb; i++) {
    circles[i] = new PVector(0, 0, map(i, 0, nb - 1, zmax, zmin));
    colors[i] = color(random(110, 255), 0, random(60, 150));
    colors[i] = color(random(220, 255), 255, 255);
  }
}
​
void draw() {
  background(20);
  translate(width/2, height/2);
  PVector pv;
  float fc = (float)frameCount, a;
  if (dots) beginShape(POINTS); 
​
  for (int i = 0; i < nb; i++) {
    pv = circles[i];
    pv.z += zstep;
    pv.x = (noise((fc*2 + pv.z) / 550) - .5) * height * map(pv.z, zmin, zmax, 6, 0);
    pv.y = (noise((fc*2 - 3000 - pv.z) / 550) - .5) * height * map(pv.z, zmin, zmax, 6, 0);
​
    a = map(pv.z, zmin, zmax, 0, 255);
    if (!bnw)stroke(colors[i], a);
    else stroke(map(pv.z, zmin, zmax, 0, 255), a);
    float r = map(pv.z, zmin, zmax, rad*.1, rad);
​
    if (dots) {
      float jmax = r;
      for (int j  = 0; j < jmax; j++)
      {
        vertex(pv.x + r*cos(j*TWO_PI/jmax + fc/40)/2, pv.y + r*sin(j*TWO_PI/jmax + fc/40)/2, pv.z);
      }
    } else {
      pushMatrix();
      translate(pv.x, pv.y, pv.z);
      ellipse(0, 0, r, r);
      popMatrix();
    }
​
    if (pv.z > zmax) {
      circles[i].z = zmin;
    }
  }
  if (dots) endShape();
}
​
void keyPressed(){dots = !dots;}
void mousePressed(){bnw = !bnw;}
​