def setup 
  createCanvas(100, 100, WEBGL)
  button = createButton('New')
  button.mousePressed do
    makeParticles
  end
  makeParticles
end

def makeParticles 
  freeGeometry(@particles) if @particles

  @particles = buildGeometry do
    60.times do
      push do
        x = randomGaussian(0, 20)
        y = randomGaussian(0, 20)
        z = randomGaussian(0, 20)
        translate(x, y, z)
        sphere(5)
      end
    end
  end
end

def draw 
  background(255)
  noStroke
  lights
  orbitControl
  model(@particles)
end