Snowy Day

ArrayList < Particle > Weather = new ArrayList < Particle > ();

int tick;

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void setup() {

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  fullScreen();

  background(184, 208, 247);

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}

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void draw() {

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  fullScreen();

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  Weather.add(0, new Particle());

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  for (Particle v: Weather) {

    v.render();

  }

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  // landscape

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  fill(230, 230, 230);

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  ellipse(width / 3.4, 0 + sin(tick / 15) * 15, width / 1.5, 230);

  ellipse(width - 300, 50 + cos(tick / 20) * 15, width / 2, 275);

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  tick++;

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}

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class Particle {

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  float xPos, yPos, zPos, xVel, yVel, zVel;

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  Particle() {

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    xPos = random(width);

    yPos = 150;

    zPos = random(5);

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    xVel = random(-2, 2);

    yVel = random(3, 6);

    zVel = random(-0.2, 0.2);

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  }

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  void render() {

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    noStroke();

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    fill(155, 155, 255, zPos * 5 + 100);

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    ellipse(xPos, yPos, 5 * zPos / 3, 9 * zPos / 3);

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    xPos += xVel;

    yPos += yVel;

    zPos += zVel;

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    yVel += 0.1;

    if (yPos >= height) {xVel *= 0.6655; yVel *= -0.6655; zVel *= 0.2;}

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  }

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}