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124 <h1 class="whs1">Stream Lines presentation</h1>
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126 <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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127 into lines the cells with vectors having most similar direction. A streamline
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128 can be thought of as the path that a massless particle takes in a vector
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129 field. Streamlines are used to convey the structure of a vector field.
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130 Usually streamlines are created to explore the most interesting features
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133 <p class="whs4">Creating streamlines
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134 requires specifying multiple parameters including <span style="font-weight: bold;"><B>starting
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135 points</B></span> of streamlines, <span style="font-weight: bold;"><B>direction</B></span>
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136 and other parameters to control the <span style="font-weight: bold;"><B>propagation</B></span>
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137 of the streamlines.</p>
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139 <p class="whs4"> In
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140 <span style="font-weight: bold;"><B>VISU</B></span> there is an option allowing
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141 to specify <span style="font-weight: bold;"><B>one particular area</B></span>
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142 of the field on which the <span style="font-weight: bold;"><B>Stream Lines</B></span>
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143 presentation will be created. This option has been created for optimization
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144 purposes: sometimes generation of a Stream Lines presentation based on
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145 all points of a very complicated field is very time-consuming and requires
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146 a lot of hardware resources. </p>
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148 <p class="whs5">To bound the area on which the Stream
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149 Lines presentation will be created. you can use another field presentation.
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150 The points of the field located on this source presentation will serve
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151 as starting points for generated streamlines. </p>
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153 <p class="whs6"> </p>
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156 style="text-align: justify;"><span class=expandtext
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157 style="color: #000000;"><font color=black >To create
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158 a Stream Lines presentation:</font></span></p>
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160 <p class="whs7"> </p>
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162 <p class="whs6">- Right-click on one
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163 of the time stamps of the field in the Object browser and from the pop-up
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164 menu choose <span style="font-weight: bold;"><B>Stream Lines, </B></span>or</p>
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166 <p class="whs6"> </p>
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168 <p class="whs6">- Click on one of the
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169 time stamps of the field in the Object browser and select from the main
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170 menu <span style="font-weight: bold;"><B>Visualization > Stream Lines</B></span>,
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171 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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172 the <span style="font-weight: bold;"><B>Visualization Toolbar.</B></span></p>
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174 <p class="whs6"> </p>
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176 <p class="whs9">The following dialog
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177 box will appear: </p>
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179 <p class="whs9"> </p>
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181 <p class="whs10"><img src="../image13.jpg" width="400px" height="386px" border="0" class="img_whs11"></p>
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183 <p class="whs9"> </p>
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185 <p class="whs9"><span style="font-weight: bold;"><B>Stream
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186 Lines </B></span><span>tab allows you to set additional parameters of your
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187 Stream Lines presentation:</span></p>
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189 <p class="whs6"> </p>
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191 <p class="whs6">- <span style="font-weight: bold;"><B>Source</B></span>:
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192 This set of fields allow to define a definite source presentation on the
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193 basis of which your <span style="font-weight: bold;"><B>Stream Lines </B></span><span>presentation
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194 will be generated. </span> </p>
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196 <p class="whs6"> </p>
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198 <p class="whs6">If in the <span style="font-weight: bold;"><B>Source
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199 type </B></span>choose box you have chosen <span style="font-weight: bold;"><B>None</B></span>,
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200 your Stream Lines presentation will be generated on <span style="font-weight: bold;"><B>all</B></span>
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201 points of the field. </p>
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203 <p class="whs6">You can also specify
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204 the source presentation (from the list of already created field presentations).
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205 The points of the field located on this source presentation will serve
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206 as starting points for generated streamlines. </p>
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208 <p class="whs6">In the <span style="font-weight: bold;"><B>Used
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209 points</B></span> field you can set the number of these starting points (from
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212 <p class="whs6"> </p>
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214 <p class="whs6">- <span style="font-weight: bold;"><B>Propagation
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215 Time </B></span>field: this parameter controls the maximum length of the stream
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216 line (measured in units of time)</p>
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218 <p class="whs6"> </p>
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220 <p class="whs6">- <span style="font-weight: bold;"><B>Step
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221 Length </B></span>field: this parameter defines the size of the output line
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222 segments that make up the streamline (which is represented as a polyline).</p>
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224 <p class="whs6"> </p>
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226 <p class="whs6">- <span style="font-weight: bold;"><B>Integration
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227 Step </B></span>field: parameter of smoothness of the stream lines. This parameter
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228 defines the accuracy of construction of the streamlines. A smaller value
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229 of this parameter allows to construct smoother streamlines (at the cost
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230 of more computation time).</p>
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232 <p class="whs6"> </p>
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234 <p class="whs12">- Direction <span style="font-weight: normal;">choose
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235 box: this option allows to select direction of the stream lines.(Forward,
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236 Backward or Both)</span></p>
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238 <p class="whs12"> </p>
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240 <p class="whs6">- <span style="font-weight: bold;"><B>Magnitude
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241 coloring</B></span> check box: this option allows to color your presentation
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242 according the vector values applied to the cells of the mesh or to display
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243 it using only one color (this color can be selected if you click <span
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244 style="font-weight: bold;"><B>Use Color </B></span>button).</p>
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246 <p class="whs2"> </p>
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248 <p><span style="font-weight: bold;"><B>Scalar Bar </B></span>tab allows to define
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249 the parameters of the scalar bar displayed along with this presentation
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250 (<a href="scalar_map_presentation.htm#Scalar Bar">see also</a>).</p>
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254 <p class="whs2"><span style="font-family: 'Times New Roman', serif;">After
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255 you have finished with setting these parameters, click <span style="font-weight: bold;"><B>OK.
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256 </B></span>Your presentation with scalar bar will be immediately displayed
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257 in the viewer: </span></p>
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259 <p class="whs2"> </p>
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261 <p class="whs6"> <img src="../pics/streamlinesprsnt.jpg" x-maintain-ratio="TRUE" width="574px" height="411px" border="0" class="img_whs13"></p>
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