Re: [Paraview] Compute line between coordinates

[Samuel Key]

Dorian, If by chance you have a list of coordinates for your junction-points, and you have a list junction-pairs you can construct a "wire-frame grid." Junction-point arrays: X(1:NUMJP), Y(1:NUMJP), Z(1:NUMJP) Junction-pair array: BAR(1:2,1:NUMBR) Where NUMJP = Number of junction points, NUMBR = Number of bars. The value for BAR(1,n) is the array location in X,Y,Z for the first point of junction-pair "n", and the value for BAR(2,n) is the array location in X,Y,Z for the second point of junction-pair "n" The simplest and best documented format for these arrays to be read into ParaView is the VTK-Legacy datum set description. ( http://www.vtk.org/wp-content/uploads/2015/04/file-formats.pdf and see page 9 with a VTK_LINE). Once you have the "static" grid displayed then you can then consider a "dynamic" display, that is, a time-series display. To get a time-series display, you will need a "time schedule" that represents when each junction-pair is communicating (firing?). Each time their is a communication between two points you will need another copy of the static grid display file, for example, syn000.vtk, syn001.vtk, syn002.vtk, ... where syn000.vtk has cell data for *all* bars with a value, say, "0.0" the static state syn001.vtk has cell data for each 'communicating' bar with a cell value "1.0" If you have 999, different time values for junction-pair communications, then you will have a file sequence out to syn999.vtk. The VTK-reader in ParaView will 'see' this  file sequence and treat it as a time-series. The animation feature in ParaView, will let you create an *.avi file that is a 'movie' of the junction-pairs communicating over time. At this point, if you have an idea of how long it takes for a signal to go from one point to another, you can add "way-points" to the bars to get a 'multiple-cell' bar and illuminate the signal passage in the bar cell-by-cell with 0, 0, 0.5, 1.0, 0.5, 0, 0, 0, ... For myself, I would write a small program that takes the arrays, X, Y, Z, and BAR and writes them out to a VTK-Legacy file. It will take some effort to create a sequence of VTK-Legacy files, but ParaView  will become more versatile with a proper datum set. Your VTK-Legacy writer is easily expanded to include more data. Sam Key On 10/31/2016 8:09 PM, Dorian Pustina wrote: Hello everyone, 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): iHat*X snapped+jHat*Y snapped+kHat*Z snapped 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. Can someone help if this is possible? Dorian _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Search the list archives at: http://markmail.org/search/?q=ParaView Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/paraview

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