hairLineToroid

// Inspired by David Crooks' sketch  "tendrils" 

// https://www.openprocessing.org/sketch/398747

// Random lines. Takes about a minute to render fully.

// random, PVector, frameCount, line, hair, generative, noLoop

// No interaction

​

void setup() {

  size(650, 650);

  background(0);

}

​

void draw() { 

  strokeWeight(1);

  drawLines();

  if (frameCount > 4000) noLoop();

}

​

void drawLines() {

  PVector pos = new PVector(width/2, height/2);

  PVector vel = new PVector(random(-1, 1), random(-1, 1));

  vel.normalize();

  PVector strtRad =  PVector.mult(vel, random(50, 60));

  pos.add(strtRad);

  PVector nextPos = PVector.add(pos, vel);

  for (int i = 0; i < 260; i++) {

    float where1 = random(130, 250);

    float where2 = random(-5,10);

    if (i > where1 || i < where2) stroke(96, 124, 130, 30);

    else stroke(random(220, 255), 30);

    line(pos.x, pos.y, nextPos.x, nextPos.y);

    pos = nextPos.get();

    if (i > 200 ) vel.rotate(random(-0.3, 0.3));

    else vel.rotate(random(-0.04, 0.04));

    nextPos.add(vel);

  }

}

​