92c4efac7d
I needed the ability to use ATTR_HTML in org-mode: https://github.com/jgm/pandoc/pull/2927 Doing this update required me to fix somes YAML in some posts.
55 lines
2.6 KiB
Markdown
55 lines
2.6 KiB
Markdown
---
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title: "Processing: DLA, quadtrees"
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date: July 4th, 2010
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author: Chris Hodapp
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tags: processing
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---
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I first dabbled with
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[Diffusion-Limited Aggregation](http://en.wikipedia.org/wiki/Diffusion-limited_aggregation)
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algorithms some 5 years back when I read about them in a book (later
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note: that book was
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[Nexus: Small Worlds and the Groundbreaking Theory of Networks](http://www.amazon.com/Nexus-Worlds-Groundbreaking-Science-Networks/dp/0393324427?ie=UTF8&*Version*=1&*entries*=0)). The
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version I wrote was monumentally slow because it was a crappy
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implementation in a slow language for heavy computations
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(i.e. Python), but it worked well enough to create some good results
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like this:
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[{width=50%}](../images/dla2c.png)\
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After about 3 or 4 failed attempts to optimize this program to not
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take days to generate images, I finally rewrote it reasonably
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successfully in [Processing](http://processing.org/) which I've taken
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a great liking to recently. I say "reasonably successfully" because it
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still has some bugs and because I can't seem to tune it to produce
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lightning-like images like this one, just much more dense
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ones. Annoyingly, I did not keep any notes about how I made this
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image, so I have only a vague idea. It was from the summer of 2005 in
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which I coded eleventy billion really cool little generative art
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programs, but took very sparse notes about how I made them.
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It was only a few hours of coding total. Part of why I like Processing
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is the triviality of adding interactivity to something, which I did
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repeatedly in order to test that the various building-blocks of the
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DLA implementation were working properly.
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The actual DLA applet is at
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[http://openprocessing.org/visuals/?visualID=10799](http://openprocessing.org/visuals/?visualID=10799). Click
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around inside it; right-click to reset it. The various building blocks
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that were put together to make this are:
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[here](http://openprocessing.org/visuals/?visualID=10794),
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[here](http://openprocessing.org/visuals/?visualID=10795),
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[here](http://openprocessing.org/visuals/?visualID=10796),
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[here](http://openprocessing.org/visuals/?visualID=10797), and
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[here](http://openprocessing.org/visuals/?visualID=10798).
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These are at OpenProcessing mostly because I don't know how to embed a
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Processing applet in Wordpress; perhaps it's better that I don't,
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since this one is a CPU hog. (*Later note:* I wonder if I can just
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host these examples inline using
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[Processing.js](http://processingjs.org/)...)
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This blog also has an entire gallery of generative art with Processing
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that I think is great:
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[http://myecurve.wordpress.com/](http://myecurve.wordpress.com/)
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