[Paraview] Broken Streamlines

[Berk Geveci]

Hi Louis,

Very cool dataset. My guess is that there is a topology problem with this
dataset - some cells that are neighbors but don't exactly share vertices on
neighboring faces. Maybe hanging nodes because of some sort of refinement?
This is usually when the point locator fails. To locate a cell containing a
point, it first locates the closest point and then walks neighboring cells
until it finds a match. The walk will fail if two neighbor cells don't
actually share points because of some weird topology. The cell locators is
the fix to these issues. The reason it is not currently the default is
performance. We are working on improving the cell locator performance so
that it can be the default behavior in the future.

Also, as Andy mentioned, the ReasonForTermination array provides good info
for debugging such issues. Here are the possible values:

    OUT_OF_DOMAIN = 0,
    NOT_INITIALIZED = 1 ,
    UNEXPECTED_VALUE = 2,
    OUT_OF_LENGTH = 4,
    OUT_OF_STEPS = 5,
    STAGNATION = 6,

If you see OUT_OF_DOMAIN inside the mesh, it is usually an indication that
you should either fix your mesh or use the cell locator.

Best,
-berk


On Wed, Feb 7, 2018 at 3:28 PM, Steytler, Louis Louw <steytle1 at illinois.edu>
wrote:

> Hi Everyone,
>
> Thanks very much for all the suggestions.
>
> Setting the streamline interpolator type to:
>
>
>
> *streamTracer1.InterpolatorType = 'Interpolator with Cell Locator' *solved
> the problem!
>
> Thanks  again,
>
> Louis Steytler
> Department of Mechanical Science and Engineering
> University of Illinois at Urbana-Champaign
> 1206 West Green Street
> Urbana, Il 61801
> steytle1 at illinois.edu
> ------------------------------
> *From:* Burlen Loring [bloring at lbl.gov]
> *Sent:* 07 February 2018 12:50 PM
> *To:* Steytler, Louis Louw
> *Subject:* Re: [Paraview] Broken Streamlines
>
> Hi Louis,
>
> Is there any chance this is the rendering precision issue called depth
> buffer fighting? What happens when you turn off display of the plane? Are
> the streamlines still broken?
>
> Burlen
>
>
> On 02/07/2018 09:06 AM, Steytler, Louis Louw wrote:
>
> Hi Everyone,
>
> When generating streamlines from a 3D computation, in some parts, the
> streamlines appear broken. This is shown in the attached image (the arrows
> point to the broken parts).
>
> Increasing the "Maximum Streamline Length" parameter did not help.
>
> Using the "Point to Cell Data" filter, and then generating streamlines on
> the cell data did not help.
>
> Although in the image shown the broken parts are in an area of low
> velocity, this happens in regions of high velocity as well. It also does
> not seem to depend on grid resolution, as the broken parts show up all over.
>
> Has anyone experienced anything like this? Any ideas how to work around
> this?
>
> Thanks very much,
>
> Louis Steytler
> Department of Mechanical Science and Engineering
> University of Illinois at Urbana-Champaign
> 1206 West Green Street
> Urbana, Il 61801
> steytle1 at illinois.edu
>
>
> _______________________________________________
> Powered by www.kitware.com <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.kitware.com&d=DwMC-g&c=OCIEmEwdEq_aNlsP4fF3gFqSN-E3mlr2t9JcDdfOZag&r=qqTUEqt0cjqcdFN73T7fpbvcX2uThRX9v_QqbqZpQYs&m=UHk492okk8tg_SUSRW5hSk-l6_zeqZSqRRMXl11_ZOI&s=tNQN6iCNuPdjlE7hGLzqpDcD2pR2b_oyYPD3KJlKLqs&e=>
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.kitware.com_opensource_opensource.html&d=DwMC-g&c=OCIEmEwdEq_aNlsP4fF3gFqSN-E3mlr2t9JcDdfOZag&r=qqTUEqt0cjqcdFN73T7fpbvcX2uThRX9v_QqbqZpQYs&m=UHk492okk8tg_SUSRW5hSk-l6_zeqZSqRRMXl11_ZOI&s=RN5bAXNoUf7aWElKoAmuHJl-GIHaVP1xSVESeFHWNjw&e=>
>
> Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView <https://urldefense.proofpoint.com/v2/url?u=http-3A__paraview.org_Wiki_ParaView&d=DwMC-g&c=OCIEmEwdEq_aNlsP4fF3gFqSN-E3mlr2t9JcDdfOZag&r=qqTUEqt0cjqcdFN73T7fpbvcX2uThRX9v_QqbqZpQYs&m=UHk492okk8tg_SUSRW5hSk-l6_zeqZSqRRMXl11_ZOI&s=WJjLQw8EYaHhax_wGDnmIK-AEZg4_JwHNHJL-OGKZ60&e=>
>
> Search the list archives at: http://markmail.org/search/?q=ParaView <https://urldefense.proofpoint.com/v2/url?u=http-3A__markmail.org_search_-3Fq-3DParaView&d=DwMC-g&c=OCIEmEwdEq_aNlsP4fF3gFqSN-E3mlr2t9JcDdfOZag&r=qqTUEqt0cjqcdFN73T7fpbvcX2uThRX9v_QqbqZpQYs&m=UHk492okk8tg_SUSRW5hSk-l6_zeqZSqRRMXl11_ZOI&s=x9QYkJ-360aYcyuVtoNAZGN3N0Ccm8PIUR7iV-L1z38&e=>
>
> Follow this link to subscribe/unsubscribe:https://paraview.org/mailman/listinfo/paraview <https://urldefense.proofpoint.com/v2/url?u=https-3A__paraview.org_mailman_listinfo_paraview&d=DwMC-g&c=OCIEmEwdEq_aNlsP4fF3gFqSN-E3mlr2t9JcDdfOZag&r=qqTUEqt0cjqcdFN73T7fpbvcX2uThRX9v_QqbqZpQYs&m=UHk492okk8tg_SUSRW5hSk-l6_zeqZSqRRMXl11_ZOI&s=ZBc6VXmGfFYDamKnUzQbCkiqJFQsFi73Qc4lavq5GKY&e=>
>
>
>
> _______________________________________________
> 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:
> https://paraview.org/mailman/listinfo/paraview
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://paraview.org/pipermail/paraview/attachments/20180208/ce0a4311/attachment.html>