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<h1>3D extrusion meshing algorithm</h1>
<p>3D extrusion algorithm can be used for meshing prisms, i.e.
<span style="font-weight: bold;"><B>3D Shapes</B></span> defined by
two opposing faces having the same number of vertices and edges and meshed using the
<a href="projection_algorithms.htm">2D Projection</a> algorithm. These
two faces should be connected by quadrangle "side" faces.</p>
<p><span style="margin-left: 24px;
margin-top: 0pt;
margin-bottom: 0pt;">The opposing faces can be meshed with
either quadrangles or triangles, while the side faces should be meshed
with quadrangles only. </span></p>
<p class="whs1"><img src="image157.gif" width="324px" height="337px" border="0" class="img_whs2"></p>
<p class="whs1"> </p>
<p class="whs3">As you can see, the <span style="font-weight: bold;"><B>3D extrusion</B></span>
algorithm permits to build and to have in the same 3D mesh such elements
as hexahedrons, prisms and polyhedrons.</p>
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