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<h1 id="rotateln">ROTATELN</h1>
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<hr />
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<p>Rotates a point distribution about a line.</p>
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<h2 id="syntax">SYNTAX</h2>
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<pre>
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<b>rotateln</b>/ifirst,ilast,istride/[<b>no</b>]<b>copy</b> / x1,y1,z1/x2,y2,z2/ theta/xcen,ycen,zcen/
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</pre>
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<p><code class="language-plaintext highlighter-rouge">ifirst,ilast,istride</code> is the node range selected by node numbers or pset,get,pname.</p>
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<p><strong><code class="language-plaintext highlighter-rouge">nocopy</code></strong> keeps only the rotated points, the node count does not change.</p>
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<p><strong><code class="language-plaintext highlighter-rouge">copy</code></strong> keeps a copy of the original unrotated points, as well as the rotated points.
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The new points will have the rotated coordinate values but no other mesh attributes will be set for these points.</p>
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<p><code class="language-plaintext highlighter-rouge">x1,y1,z1 / x2,y2,z2</code> are the end points of the rotation line and must extend beyond the boundaries of the selected point set.</p>
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<p><code class="language-plaintext highlighter-rouge">theta</code> in degrees is the angle of rotation whose positive direction is determined by the right-hand-rule, that is, if the thumb of your right hand points in the direction of the line (1 to 2), then your fingers will curl in the direction of rotation.</p>
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<p><code class="language-plaintext highlighter-rouge">xcen,ycen,zcen</code> is the point where the line can be shifted to before rotation takes place.</p>
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<h2 id="examples">EXAMPLES</h2>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>define / SIZE / 10.0
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cmo / create / mo01 / / / hex
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createpts / xyz / 2, 2, 10 / 0, 0, 0 / SIZE, SIZE, SIZE / 1 1 1
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rotateln / 1 0 0 / nocopy / 0 0 0 / 0 0 5 / 90 / 0, 0, 0
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</code></pre></div></div>
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<p>Create a cube of points and rotate it 90 degrees about the z-axis.</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>createpts/brick/xyz/NX NY NZ /X0 Y0 Z0 / X1 Y1 Z1 /1,1,1
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cmo/setatt/mohex imt 1
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# Define Degree of rotation around line along y axis
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# Color each set after it is rotated
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define ROTDEG 20.
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rotateln/1,0,0/copy/ 0. 500. 0./ 0. -1. 0. / ROTDEG
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pset/ prot1 / seq /0,0,0/
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cmo/setatt/mohex/imt/pset,get,prot1 2
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define ROTDEG 110.
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rotateln/1,0,0/copy/ 0. 500. 0./ 0. -1. 0. / ROTDEG
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pset/ prot2 / seq /0,0,0/
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cmo/setatt/mohex/imt/pset,get,prot2 3
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</code></pre></div></div>
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<p>Rotate points using copy to keep each rotation. Blue is the original set of points laying flat along the X axis.
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Green is the second rotation of 20 degress.
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Red is the third rotation of 110 degrees which includes both the original and second rotations.</p>
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<p><a href="../demos/output/test_rotateln_example.png"> <img width="400" src="../demos/output/test_rotateln_example.png" /></a></p>
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<h2 id="demos">DEMOS</h2>
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<p>Demo of rotated cylinder in a box: <a href="/pages/docs/demos/main_rotateln.html">ROTATELN</a></p>
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