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

[Cory Quammen]

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