Computational Arts by Matthew Brown

I received some feedback on my earlier versions of the walking lines in the form of a trackback from Alex.

The feedback was part of a practice peer review, but he went into some detail on how i could fix up my current code so that the lines follow on from each other and how to reduce the load on the CPU per cycle with the same effect. The advice is greatly appreciated.

View the new version online here.

The changes and source code are after the jump.

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In the week 2 tutorial for KKB211 - Computational Arts 2, we are looking at doing walking lines in our chosen development tool.

Walking lines are effectively randomly generated paths that the lines follow to create a random image.

I have been using Processing for this particular focus. Thus far I have random lines, however they don’t follow any particular path as of yet. This is effectively still walking lines as the position of the lines is added to and built on. Unfortunately this actually draws a new line every frame that is not necessarily joined to the line from the previous frame.

Have a look at it online here.

The code used to do this is extremely simple and just involves a few random variables based on the width and height of the canvas. I don’t believe this is entirely stochastic because the randoms are tightly controlled, but it is random within its boundaries (unless you want to get into the nitty gritty of it, which I don’t).

The source code is available after the jump.

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Just playing with Quartz Composer. Four dancing balls that bounce horizontally and vertically.

The file, dancing_balls.qtz is online here.

There were a few problems with the first responsive lines that I did. Mainly related to visibility. For the lines I decided to make their visibility based on the audio spectrum as well as the volume, so sometimes they vanish altogether when they shouldn’t.

I have mostly fixed this now, it does still occasionally happen but not too often and in general it responds to all audio better than it did before. It is more sensitive overall.

There are some changes to the rotations as well so now there is more variation in how the lines appear, including the illusion of a horizon, so there is a lot more randomness to it.

I have also gone through and added in notes to make it easier to figure out what does what later on, also so anyone looking at it can figure it out relatively easily.

The Quartz Composer file, responsive_lines_2.qtz is available here.

It requires input via the built in mic in Macbook’s or iMac’s. It can of course be changed to accept audio input from the microphone-in, or line-in on Mac Pro’s or Mac Mini’s. With the right plug-in, it can also accept input from iTunes.

The most ideal is via line-in or microphone in as this gives the most control over what exactly the graphics are being synchronised with. However, using the built-in microphone means that no extra accessories are required.

Note that this was done using  Quartz Composer in Leopard.

I decided to experiment a bit more with the patches I had been using for my responsive particles to try making some audio responsive lines.

The lines turned out to be a bit harder to work with than the particles since there are quite a few more things to control, but they did produce an interesting result.

The Quartz Composer file, responsive_lines.qtz is available online here.

Note that this one involves a lot more flashing than the other’s, so if you are epileptic or just don’t handle rapid flashing colours very well, you are looking at it at your own risk.