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102 <h1 class="whs1">Stream Lines presentation</h1>
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104 <p class="whs2"><span style="font-weight: bold;"><B><img src="../i_blue.jpg" x-maintain-ratio="TRUE" width="30px" height="30px" border="0" class="img_whs3">Stream Lines </B></span>is a type of presentation transforming
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105 the cells with vectors having most similar direction into lines . A streamline
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106 can be thought of as the path that a massless particle takes in a vector
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107 field. Streamlines are used to convey the structure of a vector field.
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108 Usually streamlines are created to explore the most interesting features
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111 <p class="whs4">Creating streamlines
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112 requires specifying multiple parameters including <span style="font-weight: bold;"><B>starting
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113 points</B></span> of streamlines, <span style="font-weight: bold;"><B>direction</B></span>
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114 and other parameters to control the <span style="font-weight: bold;"><B>propagation</B></span>
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115 of the streamlines.</p>
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117 <p class="whs4"> In
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118 <span style="font-weight: bold;"><B>Post-Pro</B></span> there is an option allowing
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119 to specify <span style="font-weight: bold;"><B>one particular area</B></span>
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120 of the field on which the <span style="font-weight: bold;"><B>Stream Lines</B></span>
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121 presentation will be created. This option has been created for optimization
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122 purposes: sometimes generation of a Stream Lines presentation based on
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123 all points of a very complicated field is very time-consuming and requires
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124 a lot of hardware resources. </p>
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126 <p class="whs5">To bound the area on which the Stream
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127 Lines presentation will be created. you can use another field presentation.
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128 The points of the field located on this source presentation will serve
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129 as starting points for generated streamlines. </p>
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131 <p class="whs6"> </p>
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134 style="text-align: justify; color: #000000;"><span class=expandtext
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135 style="color: #000000;"><font color=black >To
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136 create a Stream Lines presentation:</font></span></p>
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138 <p class="whs7"> </p>
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140 <p class="whs6">- Right-click on one
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141 of the time stamps of the field in the Object browser and from the pop-up
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142 menu choose <span style="font-weight: bold;"><B>Stream Lines, </B></span>or</p>
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144 <p class="whs6">- Click on one of the
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145 time stamps of the field in the Object browser and select from the main
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146 menu <span style="font-weight: bold;"><B>Visualization > Stream Lines</B></span>,
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147 or click <img src="../pics/streamlinesicon.jpg" x-maintain-ratio="TRUE" width="26px" height="25px" border="0" class="img_whs8"> icon<span style="font-weight: bold;"> <B></B></span>in
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148 the <span style="font-weight: bold;"><B>Visualization Toolbar.</B></span></p>
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150 <p class="whs6"> </p>
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152 <p class="whs9"><span class=expandtext
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153 style="color: #000000;"><font color=black ><img src="../pics/streamlines.png" x-maintain-ratio="TRUE" width="348px" height="533px" border="0" class="img_whs10"></font></span></p>
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155 <p class="whs9"> </p>
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157 <p class="whs11"><span style="font-weight: bold;"><B>Stream
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158 Lines </B></span><span>tab allows you to set additional parameters of your
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159 Stream Lines presentation:</span></p>
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161 <p class="whs6"> </p>
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163 <ul type="disc" class="whs12">
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165 <li class=kadov-p><p class="whs13"><span
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166 style="font-weight: bold;"><B>Source</B></span>: This set of fields allows to
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167 define a source presentation on the basis of which your <span style="font-weight: bold;"><B>Stream
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168 Lines </B></span>presentation will be generated. If in the <span
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169 style="font-weight: bold;"><B>Source type </B></span>choose box you have chosen
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170 <span style="font-weight: bold;"><B>None</B></span>, your Stream Lines presentation
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171 will be generated on all points of the field. You can also choose <span
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172 style="font-weight: bold;"><B>Entity, Family, Group </B></span>or <span style="font-weight: bold;"><B>Presentation.
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173 </B></span>You can also specify the source presentation (from the list of
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174 already created field presentations). The points of the field located
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175 on this source presentation will serve as starting points for generated
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176 streamlines. </p></li>
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178 <li class=kadov-p><p class="whs14">In
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179 the <span style="font-weight: bold;"><B>Used points</B></span> field you can
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180 set the number of these starting points (from 0 to 100%).</p></li>
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182 <li class=kadov-p><p class="whs14"><span
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183 style="font-weight: bold;"><B>Step Length</B></span>: this parameter defines
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184 the size of the output line segments that make up the streamline (which
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185 is represented as a polyline). </p></li>
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187 <li class=kadov-p><p class="whs14"><span
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188 style="font-weight: bold;"><B>Integration Step </B></span>field: parameter of
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189 smoothness of the stream lines. This parameter defines the accuracy of
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190 construction of the streamlines. A smaller value of this parameter allows
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191 to construct smoother streamlines (at the cost of more computation time).</p></li>
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193 <li class=kadov-p><p class="whs14"><span
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194 style="font-weight: bold;"><B>Propagation Time </B></span>field: this parameter
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195 controls the maximum length of the stream line (measured in units of time)</p></li>
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197 <li class=kadov-p><p class="whs15">Direction <span style="font-weight: normal;">choose
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198 box: this option allows to select direction of the stream lines.(Forward,
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199 Backward or Both)</span></p></li>
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201 <li class=kadov-p><p class="whs14"><span
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202 style="font-weight: bold;"><B>Magnitude coloring</B></span> check box: this option
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203 allows to color your presentation according the vector values applied
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204 to the cells of the mesh or to display it using only one color (this color
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205 can be selected if you click <span style="font-weight: bold;"><B>Use Color
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206 </B></span>button).</p></li>
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209 <p class="whs2"> </p>
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211 <p><span style="font-weight: bold;"><B>Scalar Bar </B></span>tab allows to define
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212 the parameters of the scalar bar displayed along with this presentation
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213 (<a href="scalar_map_presentation.htm#Scalar Bar">see also</a>).</p>
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217 <p class="whs2"><span style="font-family: 'Times New Roman', serif;">After
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218 you have finished with setting these parameters, click <span style="font-weight: bold;"><B>OK.
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219 </B></span>Your presentation with scalar bar will be immediately displayed
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220 in the viewer: </span></p>
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222 <p class="whs2"> </p>
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224 <p class="whs6"> <img src="../pics/streamlinesprsnt.jpg" x-maintain-ratio="TRUE" width="574px" height="411px" border="0" class="img_whs16"></p>
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