code: function init() {
    shift++;
    samples = new SamplePoints();
    samples.setBounds( new Rectangle( 25, 25 ).size( space.size.x - 25, space.size.y - 25 ), true );
    samples.poissonSampler( 6 ); // target 6px radius
  }
docs: when ready, initiate a new set of SamplePoints. SamplePoints is a kind of PointSet.