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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">If you want to draw a line from point positions at two subsequent time steps, you can use the Temporal Particles To Pathlines filter, which traces a line behind
particles as they move through space and time. When you use this filter for your purposes, set Mask Points to 1 and Max Track Length to 2. (You can increase Max Track Length to lengthen the line to connect more than 2 timesteps.) Note that you will not see
any lines until you step time.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The Temporal Particles to Pathlines filter actually has two outputs. The first, named Pathlines, contains the lines. The second, named Particles, is a point at
the end position of the line. You can add a glyph to this output to create arrow-like filters.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Ken<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> ParaView [mailto:paraview-bounces@paraview.org]
<b>On Behalf Of </b>Dorian Pustina<br>
<b>Sent:</b> Monday, October 31, 2016 8:09 PM<br>
<b>To:</b> paraview@paraview.org<br>
<b>Subject:</b> [EXTERNAL] [Paraview] Compute line between coordinates<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello everyone,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I am working on visualizing some brain imaging data. I have a bunch of points in 3D space, which have two sets of coordinates: x1/y1/z1 and x2/y2/z2. All I need is to show arrow glyphs starting from the first coordinate and ending to the
second coordinate. I currently import the data as csv. I tried using the time series option, and I can loop through the two time points, but can't find how to model a line or an arrow for each point between the two times. I also tried to compute what is called
"velocity fields", that is a set of 3 scalar factors that if multiplied with the original coordinates would yield the second coordinate (using Calculator):<o:p></o:p></p>
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<p class="MsoNormal">iHat*X snapped+jHat*Y snapped+kHat*Z snapped<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Still, I don't get reasonable results. The problem looks trivial but I couldn't find any solution online after hours of search. It is not even clear to me what does the above formula do exactly.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Can someone help if this is possible?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dorian<o:p></o:p></p>
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