int a = 0;
int dirX, dirY, dirZ, dirSteps;
int posX, posY, posZ; 
 
void setup() {
  size(500, 500, P3D);
  background(255);
  stroke(0);
  noFill();
  
  //Position for the first point
  posX = width/2;
  posY = height/2;
  posZ = 0;
}


void draw() {
  
  //The camera is looking at the center of the scene, at 0 height. The eye is rotating on the Y-up axis
  camera(width/2 * cos(radians(a)), 0, height/2 * sin(radians(a)), width/2, height/2, 0, 0,1,0);
  // 'a' is the angle at wich the camera is rotated
  a = a + 1;
   
   
  //If the leght of the segment has reduced to '0' generates new lenght and new directions for the X, Y, Z directions
  if(dirSteps == 0) {
    dirSteps = round(random(20,100));
    dirX = round(pow(-1, round(random(1,2))));
    dirY = round(pow(-1, round(random(1,2))));
    dirZ = round(pow(-1, round(random(1,2))));
  }
  
 //Calculates the position for the point beign drawn
 posX = posX + dirX;
 posY = posY + dirY;
 posZ = posZ + dirZ;
 
 //Indicates how many points remain to be drawn for the current segment
 dirSteps --;
 
 //Draws the point
 point(posX, posY, posZ);

}