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<p><br /></p>
<h2 id="map-surfaces-to-mesh" class="uk-h3 uk-margin-remove">4. Map Surfaces to Mesh</h2>
<p>Now that the straitipgrahy has been modeled and we are comfortable with our
results, we will map their spanning domain to the parent mesh. As done with the
psets above, this process will be driven via attributes.</p>
<p>We now have two planes spanning the X,Y domain of the mesh. These planes can be
leveraged to create different material IDs at different regions of the
subsurface.</p>
<p>For example,</p>
<ul>
<li>For all nodes/cells above plane 1, set their material ID to 1</li>
<li>For all nodes/cells between plane 1 and plane 2, set their material ID to 2</li>
<li>For all nodes/cells below plane 2, set their material ID to 3</li>
</ul>
<p>This process can be accomplished by:</p>
<ol>
<li>Defining the above regions using the <code class="language-plaintext highlighter-rouge">region</code> keyword</li>
<li>Capturing the relevant nodes and elements that fall within the defined regions</li>
<li>Setting the node and element material IDs based on the <code class="language-plaintext highlighter-rouge">psets</code> and <code class="language-plaintext highlighter-rouge">eltsets</code></li>
</ol>
<h3 id="41-defining-regions">4.1 Defining Regions</h3>
<p>The syntax for <code class="language-plaintext highlighter-rouge">region</code> is:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> region / region_name / region_definition
</code></pre></div></div>
<p>where <code class="language-plaintext highlighter-rouge">region_definition</code> is a string composed of boolean operators and
instantiated <code class="language-plaintext highlighter-rouge">surface</code> objects.</p>
<p>Recall that we have defined two planes, <code class="language-plaintext highlighter-rouge">mosurf1</code> and <code class="language-plaintext highlighter-rouge">mosurf2</code>. We would like
to generate the <code class="language-plaintext highlighter-rouge">region</code> objects from these planes, but the arguments for
<code class="language-plaintext highlighter-rouge">region</code> require <code class="language-plaintext highlighter-rouge">surface</code> objects.</p>
<p>Fortunately, we can map the planes to a <code class="language-plaintext highlighter-rouge">surface</code> very easily. The syntax for
generating a <code class="language-plaintext highlighter-rouge">surface</code> object from a quad or triangle mesh is:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> surface / surface_name / reflect / sheet / input_mesh
</code></pre></div></div>
<p>The two planes can then be mapped to surface objects:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>surface / s_1 / reflect / sheet / mosurf1
surface / s_2 / reflect / sheet / mosurf2
</code></pre></div></div>
<p>And finally, we can remove the plane meshes and define regions:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / delete / mosurf1
cmo / delete / mosurf2
cmo / select / MONAME
region / r_1 / le s_1
region / r_2 / gt s_1 and le s_2
region / r_3 / gt s_2
</code></pre></div></div>
<h3 id="42-creating-eltsets-and-psets-from-regions">4.2 Creating Eltsets and PSets from Regions</h3>
<p>Point sets and element sets can easily be created through region objects.
The syntax is:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> pset / pset_name / region / region_object / 1,0,0
eltset / eltset_name / region / region_object
</code></pre></div></div>
<p>Applying this to our <code class="language-plaintext highlighter-rouge">region</code> objects yields:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>pset / p_r_1 / region / r_1 / 1 0 0
pset / p_r_2 / region / r_2 / 1 0 0
pset / p_r_3 / region / r_3 / 1 0 0
eltset / e_r_1 / region / r_1
eltset / e_r_2 / region / r_2
eltset / e_r_3 / region / r_3
</code></pre></div></div>
<h3 id="43-setting-attributes-from-eltsets-and-psets">4.3 Setting Attributes from Eltsets and PSets</h3>
<p>Recall that the node attribute <code class="language-plaintext highlighter-rouge">imt</code> holds the ‘node colors’ of the mesh, and
cell attribute <code class="language-plaintext highlighter-rouge">itetclr</code> stores the ‘cell colors’ (or material ID).</p>
<p>Let’s use the defined <code class="language-plaintext highlighter-rouge">pset</code>s and <code class="language-plaintext highlighter-rouge">eltset</code>s to change these:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / setatt / MONAME / imt / pset get p_r_1 / 1
cmo / setatt / MONAME / imt / pset get p_r_2 / 2
cmo / setatt / MONAME / imt / pset get p_r_3 / 3
cmo / setatt / MONAME / itetclr / eltset get e_r_1 / 1
cmo / setatt / MONAME / itetclr / eltset get e_r_2 / 2
cmo / setatt / MONAME / itetclr / eltset get e_r_3 / 3
</code></pre></div></div>
<p>Our mesh’s cells and nodes now store information about their intersections
with the cut-planes. Visualizing <code class="language-plaintext highlighter-rouge">itetclr</code>, we can see that this has behaved
as expected:</p>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_01.html">1. Building a Hex Mesh</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_10_fehm.html">10.1 Write FEHM Files</a></li>
<li class=""><a href="/pages/tutorial/stratigraphy/step_10_exo.html">10.2 Write ExodusII Files</a></li>
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