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<h1></h1>
<h2>light9 in 2008</h2>
</div>
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<div class="presentation">
<div class="slide">
<h1>light9 in 2008</h1>
<h2></h2>
<h3>Drew Perttula</h3>
<h4>http://bigasterisk.com/</h4>
</div>
<div class="slide">
<h1>Existing system</h1>
From my June 2005 presentation:
<pre>
(play cmds)
ascoltami --------------> mpd ----------> audio out
| (timing)
v
curvecalc subcomposer keyboardcomposer
| | |
+--- | ----+
\----- | --------/
\--+---/
| (light levels)
v
dmxserver
| (dmx levels)
......... v ....................
. entec open dmx .
. | (dmx) . external hardware
. v .
. dmx dimmer .
. | (juice) .
. v .
. light .
................................
</pre>
</div>
<div class="slide">
<h1>External libraries</h1>
<ul>
<li>Twisted - event loop and networking, xmlrpc</li>
<li>tk, tix</li>
<li>pympd - my twisted interface to mpd</li>
<li>louie - signals</li>
<li>mpd - music player daemon</li>
<li>rdflib</li>
<li>darcs</li>
</ul>
</div>
<div class="slide">
<h1>What's new: real sliders</h1>
<img src="bcf2000-desk1.jpg"/>
<ul>
<li>$200 board with 8 motorized faders (plus knobs, lights, and buttons)</li>
<li>Talks midi or usb-midi</li>
<li>Python/linux driver is easy: </li>
<pre>self.dev = open("/dev/snd/midiC1D0")
b0, which, value = [ord(b) for b in self.dev.read(3)]
self.dev.write(chr(0xb0) + chr(which[0]) + chr(int(value)))</pre>
</ul>
</div>
<div class="slide">
<h1>What's new: RDF for most data storage</h1>
<ul>
<li>Old system: ad-hoc text files. Never do this.</li>
<li>Now: most files are RDF data (saved as .n3 or ntriples)</li>
complex data structures (objects with types and attributes, attrs, lists, sets, references between files)
use DSLs to abbreviate boring parts
</div>
<div class="slide">
<h1>What's new: lightsim</h1>
<ul>
<li>We could really use a good way to preview scenes</li>
<li>Lighting follows the superposition principle</li>
<li>Original version from 2002: Tk, PIL</li>
<li>Current version: qt, OpenGL</li>
</ul>
</div>
<div class="slide">
<h1>Related projects</h1>
<li>vistrails</li>
<li>kamaelia</li>
</div>
http://www.opendmx.net/index.php/Open_DMX_USB
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