[Paraview] Compute line between coordinates

[Utkarsh Ayachit]

Assuming both the coordinates are stored in separate CSV files, there
what you can do:

1. Open both the files, one after another.
2. Select both in the Pipeline Browser, and then create "Python
Calculator" with the following expression: `inputs[1].Points -
inputs[0].Points`
3. Now apply the Glyph filter and set `Vectors` to result and change
Scale Factor to 1 and `Scale Mode` to `vector`.

Example state file attached.

On Mon, Oct 31, 2016 at 10:09 PM, Dorian Pustina <albnet at gmail.com> 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
>
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