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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">
<a id="idm281472903338568"></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">
<a id="idm281472903295640"></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">
<a id="idm281472903293448"></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">
<a id="idm281472903288136"></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">
<a id="idm281472903284760"></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="idm281472903282904"></a>
<p class="title">
<strong>Example 698. 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>
<div class="refsect1">
<a id="idm281472724746680"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
<span class="c1">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="c1">;;;RT audio I/O</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o planet.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">; Initialize the global variables.</span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">kr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">1</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="c1">; Instrument #1 - a planet oribiting in 3D space.</span>
<span class="kd">instr</span> <span class="nf">1</span>
<span class="c1">; Create a basic tone.</span>
k<span class="n">amp</span> <span class="nb">init</span> <span class="mi">5000</span>
k<span class="n">cps</span> <span class="nb">init</span> <span class="mi">440</span>
i<span class="n">fn</span> <span class="o">=</span> <span class="mi">1</span>
a<span class="n">snd</span> <span class="nb">oscil</span> k<span class="n">amp</span><span class="p">,</span> k<span class="n">cps</span><span class="p">,</span> i<span class="n">fn</span>
<span class="c1">; Figure out its X, Y, Z coordinates.</span>
k<span class="n">m1</span> <span class="nb">init</span> <span class="mf">0.5</span>
k<span class="n">m2</span> <span class="nb">init</span> <span class="mf">0.35</span>
k<span class="n">sep</span> <span class="nb">init</span> <span class="mf">2.2</span>
i<span class="n">x</span> <span class="o">=</span> <span class="mi">0</span>
i<span class="n">y</span> <span class="o">=</span> <span class="mf">0.1</span>
i<span class="n">z</span> <span class="o">=</span> <span class="mi">0</span>
i<span class="n">vx</span> <span class="o">=</span> <span class="mf">0.5</span>
i<span class="n">vy</span> <span class="o">=</span> <span class="mi">0</span>
i<span class="n">vz</span> <span class="o">=</span> <span class="mi">0</span>
i<span class="n">h</span> <span class="o">=</span> <span class="mf">0.0003</span>
i<span class="n">fric</span> <span class="o">=</span> <span class="o">-</span><span class="mf">0.1</span>
a<span class="n">x1</span><span class="p">,</span> a<span class="n">y1</span><span class="p">,</span> a<span class="n">z1</span> <span class="nb">planet</span> k<span class="n">m1</span><span class="p">,</span> k<span class="n">m2</span><span class="p">,</span> k<span class="n">sep</span><span class="p">,</span> i<span class="n">x</span><span class="p">,</span> i<span class="n">y</span><span class="p">,</span> i<span class="n">z</span><span class="p">,</span> \
i<span class="n">vx</span><span class="p">,</span> i<span class="n">vy</span><span class="p">,</span> i<span class="n">vz</span><span class="p">,</span> i<span class="n">h</span><span class="p">,</span> i<span class="n">fric</span>
<span class="c1">; Place the basic tone within 3D space.</span>
k<span class="n">x</span> <span class="nb">downsamp</span> a<span class="n">x1</span>
k<span class="n">y</span> <span class="nb">downsamp</span> a<span class="n">y1</span>
k<span class="n">z</span> <span class="nb">downsamp</span> a<span class="n">z1</span>
i<span class="n">dist</span> <span class="o">=</span> <span class="mi">1</span>
i<span class="n">ft</span> <span class="o">=</span> <span class="mi">0</span>
i<span class="n">mode</span> <span class="o">=</span> <span class="mi">1</span>
i<span class="n">mdel</span> <span class="o">=</span> <span class="mf">1.018853416</span>
i<span class="n">ovr</span> <span class="o">=</span> <span class="mi">2</span>
a<span class="n">w2</span><span class="p">,</span> a<span class="n">x2</span><span class="p">,</span> a<span class="n">y2</span><span class="p">,</span> a<span class="n">z2</span> <span class="nb">spat3d</span> a<span class="n">snd</span><span class="p">,</span> k<span class="n">x</span><span class="p">,</span> k<span class="n">y</span><span class="p">,</span> k<span class="n">z</span><span class="p">,</span> i<span class="n">dist</span><span class="p">,</span> \
i<span class="n">ft</span><span class="p">,</span> i<span class="n">mode</span><span class="p">,</span> i<span class="n">mdel</span><span class="p">,</span> i<span class="n">ovr</span>
<span class="c1">; Convert the 3D sound to stereo.</span>
a<span class="n">left</span> <span class="o">=</span> a<span class="n">w2</span> <span class="o">+</span> a<span class="n">y2</span>
a<span class="n">right</span> <span class="o">=</span> a<span class="n">w2</span> <span class="o">-</span> a<span class="n">y2</span>
<span class="nb">outs</span> a<span class="n">left</span><span class="p">,</span> a<span class="n">right</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">; Table #1 a sine wave.</span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="c1">; Play Instrument #1 for 10 seconds.</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">10</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472903278712"></a>
<h2>See Also</h2>
<p> More information on this opcode: <a class="ulink" href="http://www.csoundjournal.com/issue9/FlutesInOrbit.html" target="_top"><em class="citetitle">http://www.csoundjournal.com/issue9/FlutesInOrbit.html</em></a> , written by Brian Redfern. </p>
</div>
<div class="refsect1">
<a id="idm281472903276536"></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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