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 <[email protected]>
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 <
> [email protected]> 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:[email protected]] *On Behalf Of 
>> *Greenwood,
>> Michael
>> *Sent:* April 15, 2015 16:08
>> *To:* Berk Geveci
>> *Cc:* [email protected]
>> *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:[email protected]
>> <[email protected]>]
>> *Sent:* April 15, 2015 15:57
>> *To:* Greenwood, Michael
>> *Cc:* [email protected]
>> *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 <
>> [email protected]> 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:[email protected]]
>>
>>
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>
>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>



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