an>
      radiusPlus1 = iradius + <span class="number">1</span>
      sumFactor = radiusPlus1 * (radiusPlus1 + <span class="number">1</span>) / <span class="number">2</span>

      stackStart = <span class="keyword">new</span> BlurStack()
      stackEnd = <span class="literal">undefined</span>
      stack = stackStart
      
      <span class="keyword">for</span> i <span class="keyword">in</span> [<span class="number">1.</span>..div]
        stack = stack.next = <span class="keyword">new</span> BlurStack()
