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<p><img height="300" width="300" src="https://lanl.github.io/LaGriT/assets/images/arrow2.gif" />“30”
“30”](http://www.ees.lanl.gov/staff/rao/mstkla/mstkla.md#MESH%20EDGE:) <img height="300" width="300" src="https://lanl.github.io/LaGriT/assets/images/arrow3.gif" />“30”
“30”](http://www.ees.lanl.gov/staff/rao/mstkla/MeshFace.md) <img height="300" width="300" src="https://lanl.github.io/LaGriT/assets/images/arrow4.gif" />“30”
“30”](http://www.ees.lanl.gov/staff/rao/mstkla/MeshVertex.md)</p>
<hr />
<hr />
<p>   <strong>MESH EDGES:</strong></p>
<hr />
<p>Since LaGriT does not really store mesh edges, the mesh edge data</p>
<p>structure (<em>MeshEdge</em>, <em>PMeshEdge</em>) is created on the fly whenever edge</p>
<p>information is requested. Therefore after utilizing the edge(s) get</p>
<p>information, it (they) should be destroyed by calling ME_Delete</p>
<p>operator.</p>
<hr />
<p><em>int</em> <strong>ME_Number</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> e);</p>
<p>*</p>
<ul>
<li>This will return 0 for now since I haven’t yet decided on a good</li>
</ul>
<p>*</p>
<ul>
<li>way to assign a unique number to the (virtual) edges of the mesh.</li>
</ul>
<hr />
<p><em>void</em> <strong>ME_Delete</strong>(<em>PMeshEdge</em> e);</p>
<p>Free the data structure associated with this edge created on the fly.</p>
<p>(There is an operator for creation but I cannot yet imagine needing to</p>
<p>make that a publicly available operator).</p>
<p><img height="300" width="300" src="https://lanl.github.io/LaGriT/assets/images/bullet12.gif" />“27” “31”
*</p>
<ul>
<li>IMPORTANT
*
*</li>
</ul>
<p>ME_Delete will not remove any connections in the mesh. It just destroys
the</p>
<p>temporary data structure used to store the edge info</p>
<hr />
<p><em>int</em> <strong>ME_IsParent</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> pe);</p>
<p>If both vertices of the edge are parents, the edge is a parent.</p>
<hr />
<p><em>PMeshEdge</em> <strong>ME_Parent</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> pe);</p>
<p>The parents of each vertex of the edge are obtained and a new ‘parent’</p>
<p>edge is constructed from them.</p>
<hr />
<p><em>void</em> <strong>ME_Children</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> pe, <em>int</em>
<em>nec,
*PMeshEdge</em>
*
*ec);</p>
<p><img height="300" width="300" src="https://lanl.github.io/LaGriT/assets/images/note1.gif" />“31” “32”
*
*</p>
<ul>
<li>NOT YET
IMPLEMENTED
*
*
*</li>
</ul>
<p>Child vertices of the face are found and appropriate combinations of
these vertices are used to construct the new ‘child’ faces. For a
combination to be appropriate, the vertices of the child face has to
point to the same material region.</p>
<hr />
<p><em>int</em> <strong>MEs_areSame</strong>(<em>PMeshEdge</em> e1, <em>PMeshEdge</em> e2);</p>
<p>Compare the data in two MeshEdge data structures and see if they</p>
<p>represent the same connection in the mesh. This operator is needed</p>
<p>since the on-the-fly <em>PMeshEdge</em> pointers may not be the same and they</p>
<p>do not directly point to any persistent “object” in the database.</p>
<hr />
<p><em>PGeomEntity</em> <strong>ME_GMentity</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> e);</p>
<p>Return the geometric model entity the edge is on. In the absence of
explicit</p>
<p>edge representation in the database, this may be problematic in a few
cases</p>
<p>cases where multiple classifications are possible.</p>
<hr />
<p><em>GType</em> <strong>ME_GMtype</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> e);</p>
<p>Return the type of geometric model entity the edge is on. This (I</p>
<p>think) is more deterministically found from the classifications of its</p>
<p>vertices but still there may be some incorrect cases. The way around</p>
<p>is complicated and will not be implemented for now.</p>
<hr />
<p><em>PMeshVert</em> <strong>ME_Vertex</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> e, <em>int</em> i);</p>
<p>Return the i’th vertex of the mesh edge. i can only be 0 or 1.</p>
<p>Parent edges return parent vertices and child edges return child
vertices.</p>
<p>If a vertex is not on an interface the vertex itself is returned.</p>
<hr />
<p><img height="300" width="300" src="https://lanl.github.io/LaGriT/assets/images/new1.gif" />“31” “12”<em>PMeshVert</em>
<strong>ME_OtherVertex</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> e, <em>PMeshVert</em> v);</p>
<p>Return the other vertex of the mesh edge (obviously the one that is not
v).</p>
<hr />
<p><em>void</em> <strong>ME_Faces</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> e, <em>int</em>
<em>nef,
*PMeshFace</em>
*
*efaces);</p>
<p>Get the “faces” of an “edge”. The faces data structures are also</p>
<p>constructed on the fly since they do not exist in the LaGriT</p>
<p>database. Also, as with other upward connectivity queries, this can</p>
<p>execute usefully only if the routine MESH_BldUpAdj is called</p>
<p>beforehand. Also, see note on freeing the <em>PMeshFace</em> structures listed</p>
<p>under MV_Edges and MV_Faces.</p>
<p>The behavior of this operator for parent and child edges is similar to</p>
<p>MV_Edges.</p>
<hr />
<p><em>void</em> <strong>ME_Regions</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> e, <em>int</em>
<em>ner,
*PMeshRegn</em>
*
*eregions);</p>
<p>Get the regions connected to an edge. MESH_BldUpAdj must be called
before this operator can be called usefully.</p>
<p>The behavior of this operator for child and parent edges is similar to</p>
<p>that of MV_Regions.</p>
<p><img height="300" width="300" src="https://lanl.github.io/LaGriT/assets/images/bullet12.gif" />“27” “31”
*</p>
<ul>
<li>IMPORTANT
*
*</li>
</ul>
<p>Since MESH_BldUpAdj builds explicit upward adjacency information, this</p>
<p>routine does not require a seed region to be provided. Also, this</p>
<p>routine will work regardless of whether there is a complete cycle of</p>
<p>regions around the edge and whether the edge is an arbitrary type of</p>
<p>non-manifold edge!!</p>
<hr />
<p><em>int</em> <strong>ME_EntOnBdry</strong>(<em>PMeshObj</em> mesh, <em>PMeshEdge</em> pe, <em>PMeshVert</em>e
pv);</p>
<p>Check if vertex is on the boundary of edge. In other words, is this</p>
<p>vertex one of the edges vertices.</p>
<p> </p>
<p> 
<img height="300" width="300" src="https://lanl.github.io/LaGriT/assets/images/arrow2.gif" />“30”
“30”](http://www.ees.lanl.gov/staff/rao/mstkla/mstkla.md#MESH%20EDGE:) <img height="300" width="300" src="https://lanl.github.io/LaGriT/assets/images/arrow3.gif" />“30”
“30”](http://www.ees.lanl.gov/staff/rao/mstkla/MeshFace.md) <img height="300" width="300" src="https://lanl.github.io/LaGriT/assets/images/arrow4.gif" />“30”
“30”](http://www.ees.lanl.gov/staff/rao/mstkla/MeshVertex.md)</p>
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