 this code is included as the <code>flametree-example.R</code> script.</p>
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</div>
</section>
<section id="glow" class="level2 page-columns page-full">
<h2 class="anchored" data-anchor-id="glow">Glow</h2>
<p>…but it could be prettier, don’t you think? Maybe we could add a glow around the leaves, to give it a twinkling look. This feels like the kind of job for a pixel filter, and ggfx should be able to do this for us. Conceptually, what we want to do is apply a “glow” filter to the <code>leaves