Spherical coordinates in Processing

spherical.pde

void setup() {
  size(600, 600, P3D);
}

void draw() {
  background(0);
  translate(width/2, height/2);
  rotateX(frameCount*0.02);
  rotateY(frameCount*0.03);
  randomSeed(4);
  for (int i = 0; i < 1000; i++) {
    PVector v = random3D();
    // This is built into Processing now
    // PVector v = PVector.random3D(this);
    v.mult(100);
    stroke(255);
    strokeWeight(4);
    point(v.x, v.y, v.z);
  }
}


PVector random3D() {
  float angle = random(0,TWO_PI);
  float vz    = random(-1,1);
  float vx = sqrt(1-vz*vz)*cos(angle);
  float vy = sqrt(1-vz*vz)*sin(angle);
  PVector  v = new PVector(vx, vy, vz);
  return v;
}