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