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<h1></h1>
<h2>light9 in 2008</h2>
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<h1>light9 in 2008</h1>
<h2></h2>
<h3>Drew Perttula</h3>
<h4>http://bigasterisk.com/</h4>
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  <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>

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  <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>
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  <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>
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  <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

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<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>
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<h1>Related projects</h1>
<li>vistrails</li>
<li>kamaelia</li>
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http://www.opendmx.net/index.php/Open_DMX_USB


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author	drewp@bigasterisk.com
date	Fri, 05 Sep 2008 07:06:34 +0000
parents
children	c96768581667