[Paraview] Contours of unstructured grid paraview 3 vs paraview 4

[Cory Quammen]

Michael,

A change has just went into ParaView that should prevent this problem in
the future.

https://gitlab.kitware.com/paraview/paraview/commit/a57c26237a41955465326a0cde8b586aecada416

If one really wants integer precision in the contour coordinates, it is
still possible with this change.

Thanks,
Cory

On Thu, Apr 16, 2015 at 9:05 AM, Greenwood, Michael <
Michael.Greenwood at nrcan-rncan.gc.ca> wrote:

>  Yup, that was the issue, it was a simple matter of changing the
> coordinates of my grid to floating point instead of integer.
>
>
>
> *From:* Cory Quammen [mailto:cory.quammen at kitware.com]
> *Sent:* April 15, 2015 21:30
> *To:* Greenwood, Michael
> *Cc:* Berk Geveci; paraview at paraview.org
>
> *Subject:* Re: [Paraview] Contours of unstructured grid paraview 3 vs
> paraview 4
>
>
>
> This email explains a bit more detail what I think the problem might be:
>
>
>
> http://www.paraview.org/pipermail/paraview/2014-October/032458.html
>
>
>
> - Cory
>
>
>
> On Wed, Apr 15, 2015 at 6:11 PM, Cory Quammen <cory.quammen at kitware.com>
> wrote:
>
>  Michael,
>
>
>
> I remember tracking down a similar bug like this. I recall it had to do
> with the type of the points being specified as an integral type. The change
> between 3 and 4 was that interpolation for the isocontours is now performed
> with the precision available in the point type, so if your point type is an
> integral value, you'll get this chunky result.
>
>
>
> Try changing your point type in your data file to float or double.
>
>
>
> Hope that helps,
>
> Cory
>
>
>
> On Wed, Apr 15, 2015 at 4:09 PM, Greenwood, Michael <
> Michael.Greenwood at nrcan-rncan.gc.ca> wrote:
>
>  The data file is being held in moderation since its larger size, let me
> see if I can find a place to store it and send a link.
>
>
>
> *From:* ParaView [mailto:paraview-bounces at paraview.org] *On Behalf Of *Greenwood,
> Michael
> *Sent:* April 15, 2015 16:08
> *To:* Berk Geveci
> *Cc:* paraview at paraview.org
> *Subject:* Re: [Paraview] Contours of unstructured grid paraview 3 vs
> paraview 4
>
>
>
> It seems that in paraview 3 it would interpolate inside the cell between
> the mesh points when building the polymesh for the contour and now it is
> snapping the interpolation to nearest grid point of my unstructured mesh.
>
>
>
>
>
> *From:* Berk Geveci [mailto:berk.geveci at kitware.com
> <berk.geveci at kitware.com>]
> *Sent:* April 15, 2015 15:57
> *To:* Greenwood, Michael
> *Cc:* paraview at paraview.org
> *Subject:* Re: [Paraview] Contours of unstructured grid paraview 3 vs
> paraview 4
>
>
>
> Very strange. I can't recall a change that can cause this. Do you have a
> dataset that we can reproduce this with?
>
>
>
> Best,
>
> -berk
>
>
>
> On Wed, Apr 15, 2015 at 3:49 PM, Greenwood, Michael <
> Michael.Greenwood at nrcan-rncan.gc.ca> wrote:
>
>  Hi I’ve upgraded to paraview 4 and now when building contours of my 3D
> unstructured grid, the contours are pixelated.  This was not the case in 3,
> and when you look at a slice of the contour overlayed with a slice of the
> volume data it is obvious that the contour in paraview 4 seems to be
> “hugging” the boundaries of my mesh instead of interpolating through it.
> How can I get my nice smooth contours I had in version 3?
>
>
>
> Thanks
>
> [image: cid:image001.png at 01D07796.42933DD0]
>
>
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> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
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>
> Please keep messages on-topic and check the ParaView Wiki at:
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>
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>
>
> --
>
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>
>
>
>
>
> --
>
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>



-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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