[Paraview] Plot on a Contour surface

[Berk Geveci]

I had some figuring this one out. Here is the pipeline:

reader -> contour -> triangle strips -> (extract selection) -> clean
to grid -> extract surface

The purpose of each filter is:

contour: extract the boundary
triangle strips: combine the points of each line to create polylines.
Otherwise, each line segment is a separate cell.
extract selection: extract one of the polylines if there are more than
one (optional)
clean to grid: convert to unstructured grid and remove duplicate points
extract surface: convert to polydata. This filter has the useful side
effect of ordering points along the polyline so that the polyline has
points 0, 1, 2, 3... instead of 0, 5, 3, 9. This is necessary for
plotting

Once you apply this pipeline, you can create a XY Plot view and plot
any variable along the curve. I can't remember if this worked on 3.4.
It definitely works with the development (cvs) version of ParaView.

In the next version, there will probably be one filter that does
everything I described here.

-berk

On Fri, Dec 5, 2008 at 5:26 PM, Berk Geveci <berk.geveci at kitware.com> wrote:
> I am guessing this is a 2D contour, correct? If yes, this is a feature
> I am supposed to work on for the next release. Can you send me an
> example file?
>
> -berk
>
> On Thu, Nov 20, 2008 at 11:16 AM, Sergio Di Bari <dibaris at tcd.ie> wrote:
>> Hi everybody,
>>
>> I'm having some problem with Paraview.
>> I have a bubble growing and detaching from a surface...it is a very
>> simple problem, I can plot the surface of the bubble making a contour
>> filter where is constant the value of the phase...in this way I can
>> see the shape of the bubble...
>> What I'd like to do is to plot the value of some parameter (as the
>> pressure of the temperature) along this contour.
>> I'd like to do something like the filter command "Plot Over Line" but
>> the problem is that I don't have a line but a contour of a bubble whit
>> a shape that changes during the growth.
>>
>> Thanks a lot!
>>
>> Sergio
>>
>> --
>> Sergio Di Bari
>> Department of Mechanical & Manufacturing Engineering
>> Parsons Building
>> Trinity College Dublin
>> Dublin 2
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>