doc/salome/gui/SMESH/files/warp.htm

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  94 <h1>Warping</h1>
  95
  96 <p><img src="../i_blue.jpg" x-maintain-ratio="TRUE" width="30px" height="30px" border="0" class="img_whs1"> <span style="font-weight: bold;"><B>Warping</B></span> indicates
  97  that a face is not planar and is applied only to 2D elements with 4 nodes.
  98  This quality control criterion is based on a projection plane created
  99  by:</p>
 100
 101 <p class="whs2">1. bisecting the four element edges, </p>
 102
 103 <p class="whs2">2. creating a point on the plane at the vector
 104  average of the corners, where the x-axis extends from the point to the
 105  bisector on edge 2. </p>
 106
 107 <p class="whs3">The plane normal is in the direction of the
 108  cross product of the x-axis and the vector from the origin to the bisector
 109  of edge 3. Every corner of the quad will then be a distance \93h\94 from the
 110  plane. The length of each half edge is measured and the shortest length
 111  is assigned \93l\94. The warp angle is the arcsine of the ratio of the projection
 112  height \93h\94 to the half edge length \93l\94. </p>
 113
 114 <p>&nbsp;</p>
 115
 116 <p class="whs2"><img src="../image24.gif" width="496px" height="336px" border="0" class="img_whs4"></p>
 117
 118 <p class="whs2">&nbsp;</p>
 119
 120 <p class=TODO>&nbsp;</p>
 121
 122 <p class=TODO>To apply the Warping quality criterion to your mesh:</p>
 123
 124 <p class=TODO>&nbsp;</p>
 125
 126 <p class="whs2">1. Display your mesh in the viewer.</p>
 127
 128 <p class="whs2">&nbsp;</p>
 129
 130 <p class="whs2">2. Choose <span style="font-weight: bold;"><B>Controls
 131  &gt; Warp </B></span>or click <img src="../image39.gif" width="23px" height="23px" border="0" class="img_whs5"> button of the toolbar. Your mesh
 132  will be displayed in the viewer with its elements colored according to
 133  the applied mesh quality control criterion:</p>
 134
 135 <p class="whs2">&nbsp;</p>
 136
 137 <p class="whs2"><img src="../image97.jpg" width="405px" height="308px" border="0" class="img_whs6"></p>
 138
 139 <p class="whs2">&nbsp;</p>
 140
 141 <p class="whs3"><span style="font-weight: bold;"><B>See Also</B></span>
 142  a sample TUI Script of a <a href="../quality_controls.htm#bookmark10">Warping
 143  quality control</a> operation. &nbsp;</p>
 144
 145 <p>&nbsp;</p>
 146
 147 <p class="whs2">&nbsp;</p>
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