---
title: Chain to key points
---

If you want a "low poly" representation of a chain, call 
<a href="/docs/api/modules/makerjs.chain.html#tokeypoints">makerjs.model.toKeyPoints(chain, [optional] maxArcFacet)</a>
passing your chain, and the maximum length of facets on arcs &amp; circles:

{% highlight javascript %}
//convert a round rectangle to key points

var makerjs = require('makerjs');

var rect = new makerjs.models.RoundRectangle(100, 50, 10);

var chain = makerjs.model.findSingleChain(rect);
var keyPoints = makerjs.chain.toKeyPoints(chain, 5);

var model = {
  models: {
    rect: rect,
    dots: new makerjs.models.Holes(1, keyPoints)
  }
};

var svg = makerjs.exporter.toSVG(model);

document.write(svg);
{% endhighlight %}

<script>
    LiveDoc.evalLastCode();
</script>