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c96768581667 c96768581667 c96768581667 c96768581667 c96768581667 2d9c85c98be6 2d9c85c98be6 2d9c85c98be6 2d9c85c98be6 2d9c85c98be6 2d9c85c98be6 c96768581667 c96768581667 c96768581667 c96768581667 2d9c85c98be6 2d9c85c98be6 2d9c85c98be6 2d9c85c98be6 2d9c85c98be6 2d9c85c98be6 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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<h1></h1>
<h2>light9 in 2008</h2>
</div>
</div>
<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 style="font-size: 60%">
(play cmds)
ascoltami -----------> mpd ------> audio out
| (timing)
v
curvecalc subcomposer keyboardcomposer
| | |
+--- | ----+
\----- | --------/
\--+---/
| (light levels)
v
dmxserver
| (dmx levels)
......... v ....................
. entec open dmx .
external . | (dmx) .
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" style="float:right; border: 2px solid #005;" width="40%"/>
<ul>
<li>$200 board with 8 motorized faders (plus knobs, lights, and buttons)</li>
<li>Talks midi over usb</li>
<li>Python/linux driver is easy:
<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></li>
</ul>
</div>
<div class="slide">
<h1>What's new: RDF for data storage</h1>
<ul>
<li>Old system: ad-hoc text files.</li>
<li>Never do this again.</li>
</ul>
</div>
<div class="slide">
<h1>Old file formats</h1>
<pre class="file">
[music]
preSong = silence-4sec.wav
postSong = silence-15sec.wav
</pre>
<pre class="file">
down-l : 0.32005
down-r : 0.3071
down-sides : 0.37
lo-c-cross : 0.24
</pre>
<pre class="file">
scoop-r right(t)
lo-fill can(t)
ch1 chase(t,names=back_colors, ontime=.6, offset=0) * ch1(t)
</pre>
<pre class="file">
patch = {
('fill-xl','b31',) : 61,
('broke', 'back8','b32',) : 62,
('blue-xl','b33broke',) : 63,
</pre>
</div>
<div class="slide">
<h1>Storage goals</h1>
<ul>
<li>Stop inventing and extending syntaxes</li>
<li>Stop reloading the files all the time. Get incremental
updates or query data as it's needed.</li>
<li>Fancier data structures</li>
<li>Arbitrary layout of files on disk</li>
<li>Keep using my most flexible editor (emacs)</li>
</ul>
</div>
<div class="slide">
<h1>New system: RDF</h1>
<ul>
<li>Most files are RDF data (saved as .n3 or ntriples)</li>
<li>Syntax(es) are already done, and all values are unambiguously labeled</li>
<li>Complex data types and relationships are almost as easy as basic ones</li>
<li>Extensible and upgradable, of course</li>
<li>Used DSLs and logic programming to abbreviate boring parts</li>
</ul>
</div>
<div class="slide">
<h1>New data, shown as n3</h1>
<pre class="file" style="font-size: 80%">
@prefix : <http://light9.bigasterisk.com/> .
@prefix sub: <http://light9.bigasterisk.com/sub/> .
@prefix t: <http://light9.bigasterisk.com/show/dance2008/⤶
song10/subterm/> .
<http://light9.bigasterisk.com/show/dance2008/song10>
:subterm t:blacklight,
t:song10,
t:song3black .
t:song10 a :Subterm;
:expression "song10(t)";
:sub sub:song10 .
t:blacklight a :Subterm;
:expression "blacklight(t)>0";
:sub sub:blacklight .
</pre>
</div>
<div class="slide">
<h1>The same data, in xml</h1>
<pre style="font-size: 45%; line-height: 1.3em;">
<rdf:RDF xmlns="http://light9.bigasterisk.com/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about="http://light9.bigasterisk.com/show/dance2008/song10">
<subterm rdf:resource="http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight"/>
<subterm rdf:resource="http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10"/>
<subterm rdf:resource="http://light9.bigasterisk.com/show/dance2008/song10/subterm/song3black"/>
</rdf:Description>
<Subterm rdf:about="http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight">
<expression>blacklight(t)&gt;0</expression>
<sub rdf:resource="http://light9.bigasterisk.com/sub/blacklight"/>
</Subterm>
<Subterm rdf:about="http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10">
<expression>song10(t)</expression>
<sub rdf:resource="http://light9.bigasterisk.com/sub/song10"/>
</Subterm>
</rdf:RDF>
</pre>
</div>
<div class="slide">
<h1>A simple line-based format</h1>
<pre style="font-size: 45%;">
<http://light9.bigasterisk.com/show/dance2008/song10> <http://light9.bigasterisk.com/subterm>⤶
<http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight> .
<http://light9.bigasterisk.com/show/dance2008/song10> <http://light9.bigasterisk.com/subterm>⤶
<http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10> .
<http://light9.bigasterisk.com/show/dance2008/song10> <http://light9.bigasterisk.com/subterm>⤶
<http://light9.bigasterisk.com/show/dance2008/song10/subterm/song3black> .
<http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight>⤶
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://light9.bigasterisk.com/Subterm> .
<http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight>⤶
<http://light9.bigasterisk.com/expression> "blacklight(t)>0" .
<http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight>⤶
<http://light9.bigasterisk.com/sub> <http://light9.bigasterisk.com/sub/blacklight> .
<http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10>⤶
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://light9.bigasterisk.com/Subterm> .
<http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10>⤶
<http://light9.bigasterisk.com/expression> "song10(t)" .
<http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10>⤶
<http://light9.bigasterisk.com/sub> <http://light9.bigasterisk.com/sub/song10> .
</pre>
</div>
<div class="slide">
<h1>Again, with less wrapping</h1>
<pre style="font-size: 40%;">
<http://l9.com/show/dance2008/song10> <http://l9.com/subterm> <http://l9.com/show/dance2008/song10/subterm/blacklight> .
<http://l9.com/show/dance2008/song10> <http://l9.com/subterm> <http://l9.com/show/dance2008/song10/subterm/song10> .
<http://l9.com/show/dance2008/song10> <http://l9.com/subterm> <http://l9.com/show/dance2008/song10/subterm/song3black> .
<http://l9.com/show/dance2008/song10/subterm/blacklight> <http://l9.com/expression> "blacklight(t)>0" .
<http://l9.com/show/dance2008/song10/subterm/blacklight> <http://l9.com/sub> <http://l9.com/sub/blacklight> .
<http://l9.com/show/dance2008/song10/subterm/blacklight> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://l9.com/Subterm> .
<http://l9.com/show/dance2008/song10/subterm/song10> <http://l9.com/expression> "song10(t)" .
<http://l9.com/show/dance2008/song10/subterm/song10> <http://l9.com/sub> <http://l9.com/sub/song10> .
<http://l9.com/show/dance2008/song10/subterm/song10> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://l9.com/Subterm> .
</pre>
</div>
<div class="slide">
<h1>Again, rendered with graphviz</h1>
<img src="rdfgraph.png" />
</div>
<div class="slide">
<h1>What's next: lightsim</h1>
<ul>
<li>We could really use a good way to preview scenes</li>
<li>Hard to use text labels for all the different lighting scenes</li>
<li>Can't work on lighting cues without looking at the stage</li>
</ul>
</div>
<div class="slide">
<h1>lightsim enablers</h1>
<ul>
<li>Light obeys superposition: <br/>F(ax+by) = aF(x) + bF(y)</li>
<li>All my lights are computer-controlled</li>
</ul>
</div>
<div class="slide">
<h1>lightsim demos</h1>
<ul>
<li>Original version from 2002: Tk, PIL</li>
<li>Current version: qt, OpenGL</li>
</ul>
</div>
<div class="slide">
<h1>More</h1>
<li>Links related to this project:<br/>
http://delicious.com/drewpca/light9</li>
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