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<div class="refentry" title="planet">
<a id="planet"></a>
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<h2>
<span class="refentrytitle">planet</span>
</h2>
<p>planet —
Simulates a planet orbiting in a binary star system.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp36412648"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>planet</em></span> simulates a planet orbiting in a binary star system. The outputs are the x, y and z coordinates of the orbiting planet. It is possible for the planet to achieve escape velocity by a close encounter with a star. This makes this system somewhat unstable.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp36465896"></a>
<h2>Syntax</h2>
<pre class="synopsis">ax, ay, az <span class="command"><strong>planet</strong></span> kmass1, kmass2, ksep, ix, iy, iz, ivx, ivy, ivz, idelta \
[, ifriction] [, iskip]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp36466992"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ix, iy, iz</em></span> -- the initial x, y and z coordinates of the planet
</p>
<p>
<span class="emphasis"><em>ivx, ivy, ivz</em></span> -- the initial velocity vector components for the planet.
</p>
<p>
<span class="emphasis"><em>idelta</em></span> -- the step size used to approximate the differential equation.
</p>
<p>
<span class="emphasis"><em>ifriction</em></span> (optional, default=0) -- a value for friction, which can be used to keep the system from blowing up
</p>
<p>
<span class="emphasis"><em>iskip</em></span> (optional, default=0) -- if non zero
skip the initialisation of the filter. (New in Csound version
4.23f13 and 5.0)
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp36469872"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ax, ay, az</em></span> -- the output x, y, and z coodinates of the planet
</p>
<p>
<span class="emphasis"><em>kmass1</em></span> -- the mass of the first star
</p>
<p>
<span class="emphasis"><em>kmass2</em></span> -- the mass of the second star
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp36471624"></a>
<h2>Examples</h2>
<p>
Here is an example of the planet opcode. It uses the file <a class="ulink" href="examples/planet.csd" target="_top"><em class="citetitle">planet.csd</em></a>.
</p>
<div class="example">
<a id="idp36472592"></a>
<p class="title">
<strong>Example 595. Example of the planet opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o planet.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 1
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="comment">; Instrument #1 - a planet oribiting in 3D space.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Create a basic tone.</span>
kamp <span class="opc">init</span> 5000
kcps <span class="opc">init</span> 440
ifn <span class="op">=</span> 1
asnd <span class="opc">oscil</span> kamp, kcps, ifn
<span class="comment">; Figure out its X, Y, Z coordinates.</span>
km1 <span class="opc">init</span> 0.5
km2 <span class="opc">init</span> 0.35
ksep <span class="opc">init</span> 2.2
ix <span class="op">=</span> 0
iy <span class="op">=</span> 0.1
iz <span class="op">=</span> 0
ivx <span class="op">=</span> 0.5
ivy <span class="op">=</span> 0
ivz <span class="op">=</span> 0
ih <span class="op">=</span> 0.0003
ifric <span class="op">=</span> <span class="op">-</span>0.1
ax1, ay1, az1 <span class="opc">planet</span> km1, km2, ksep, ix, iy, iz, \
ivx, ivy, ivz, ih, ifric
<span class="comment">; Place the basic tone within 3D space.</span>
kx <span class="opc">downsamp</span> ax1
ky <span class="opc">downsamp</span> ay1
kz <span class="opc">downsamp</span> az1
idist <span class="op">=</span> 1
ift <span class="op">=</span> 0
imode <span class="op">=</span> 1
imdel <span class="op">=</span> 1.018853416
iovr <span class="op">=</span> 2
aw2, ax2, ay2, az2 <span class="opc">spat3d</span> asnd, kx, ky, kz, idist, \
ift, imode, imdel, iovr
<span class="comment">; Convert the 3D sound to stereo.</span>
aleft <span class="op">=</span> aw2 <span class="op">+</span> ay2
aright <span class="op">=</span> aw2 <span class="op">-</span> ay2
<span class="opc">outs</span> aleft, aright
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1 a sine wave.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="comment">; Play Instrument #1 for 10 seconds.</span>
<span class="stamnt">i</span> 1 0 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp36474864"></a>
<h2>See Also</h2>
<p> More information on this opcode: <a class="ulink" href="http://www.csounds.com/journal/issue9/FlutesInOrbit.html" target="_top"><em class="citetitle">http://www.csounds.com/journal/issue9/FlutesInOrbit.html</em></a> , written by Brian Redfern. </p>
</div>
<div class="refsect1" title="Credits">
<a id="idp36476024"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Hans Mikelson</td>
</tr>
<tr>
<td>December 1998</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.50</p>
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