[Paraview] Compute line between coordinates

[Dorian Pustina]

Thank you Samuel,

The "Clip-> Box" filter is definitely better, but it still cuts out
portions of arrows. I am ataching a picture for illustration.

[image: Inline image 1]

These issues seem to arise because the arrows are not seen as unitary
objects, but as a tube and a pointer. Using cones instead of arrows is not
useful, the cones do not respect the start and end points same as arrows.

Dorian

On Tue, Nov 1, 2016 at 12:03 PM, Samuel Key <samuelkey at bresnan.net> wrote:

> Dorian,
>
> Try the CLIP filter with a box.
>
> Sam Key
>
> On 11/1/2016 9:34 AM, Dorian Pustina wrote:
>
> Thank you both for the suggestions. I managed to have the arrows via
> python calculator, but couldn't make the Temporal Particles to Pathlines
> filter produce arrows.
>
> Can I bug you with another question?
>
> I want to apply a Slice filter to see the arrows that depart from that
> slice. But the filter in Paraview just cuts through the objects in that
> slice, it doesn't show the whole arrows. It also does not have any
> tolerance (i.e., to pick points 2mm before and after the slice). Is there
> another way to get a slice with full arrows, and have some tolerance to
> pick up more points before and after the slice?
>
>
>
> On Tue, Nov 1, 2016 at 10:20 AM, Moreland, Kenneth <kmorel at sandia.gov>
> wrote:
>
>> 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.
>>
>>
>>
>> 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.
>>
>>
>>
>> -Ken
>>
>>
>>
>> *From:* ParaView [mailto:paraview-bounces at paraview.org] *On Behalf Of *Dorian
>> Pustina
>> *Sent:* Monday, October 31, 2016 8:09 PM
>> *To:* paraview at paraview.org
>> *Subject:* [EXTERNAL] [Paraview] Compute line between coordinates
>>
>>
>>
>> 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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