[Paraview] non-symmetric representation of symmetric field

[Mikhail Artemyev]

Dear Magician,

Finally I understood how it works after exact following the instructions:

set the input (VTS) and source (Plane) on the Change Input Dialog

Although I wouldn't call this dialog user-friendly, it works, so thank 
you very much for solving this issue.

Best regards,
Mikhail


On 05/27/2014 11:34 AM, Magician wrote:
> Hi Mikhail,
>
>
> Maybe the usage of Resample With Dataset is wrong.
> You should set the input (VTS) and source (Plane) on the Change Input 
> Dialog correctly.
>
> Try the attached state file.
>
>
> Magician
>
>
> On May 27, 2014, at 2:34, Mikhail Artemyev <artemiev.mikhail at gmail.com 
> <mailto:artemiev.mikhail at gmail.com>> wrote:
>
>> Dear Magician,
>>
>> Here is a precise algorithm I follow to:
>>
>> 1. Read the data (I usually do that in terminal: paraview test.vts) 
>> (test.vts is attached)
>> 2. Sources -> Plane (Origin: 0 0 0, Point1: 4 0 0, Point2: 0 2 0, X 
>> Resolution: 200, Y Resolution: 100)
>> 3. Filters -> Resample With Dataset -> (Available input ports: 
>> Source; Select Input: Plane1) (test.pvsm is attached)
>>    (After applying this filter I get nothing)
>> 4. Repeating step 3 with exactly the same parameters (if I remember 
>> correctly) gave me the desired result once. But now it doesn't. 
>> Nevertheless test2.pvsm, corresponding to the state after doing this, 
>> is attached.
>>
>> Thank you for your help!
>>
>> Best regards,
>> Mikhail
>>
>>
>>
>> On 05/23/2014 06:18 PM, Magician wrote:
>>> Hi Mikhail,
>>>
>>>
>>> I need to get more information about your problem.
>>> Can you share your dataset or screenshot?
>>> .pvsm state files are more suitable.
>>>
>>>
>>> Magician
>>>
>>>
>>> On May 24, 2014, at 5:33, Mikhail Artemyev 
>>> <artemiev.mikhail at gmail.com <mailto:artemiev.mikhail at gmail.com>> wrote:
>>>
>>>> Dear Magician,
>>>>
>>>> Thank you for the explanation and for the hint!
>>>> The only issue is that the last step of your algorithm
>>>>   3. apply Resample With Dataset filter,
>>>> not always gives the desired result.
>>>> I was able to get the same representation like you showed, but
>>>> it was an accidental choice of several Resample With Dataset filters,
>>>> and I couldn't repeat it again. My impression is that I have to apply
>>>> this filter several times to different sources. Am I right?
>>>>
>>>> Thank you.
>>>>
>>>> Best regards,
>>>> Mikhail
>>>>
>>>>
>>>> On 05/17/2014 12:00 AM, Magician wrote:
>>>>> Hi Mikhail,
>>>>>
>>>>>
>>>>> Yes, that's because of the triangulation (or tesselation) of 
>>>>> surface representations.
>>>>> Most of the 3D programs including ParaView draw objects as groups 
>>>>> of triangles.
>>>>> That's depends on today's 3D rendering pipelines such as OpenGL, 
>>>>> DirectX, etc.
>>>>> Please googling the keywords: 'vertex shading'
>>>>>
>>>>> Even though you read your data as structured grid with point values,
>>>>> ParaView should immediately triangulate all of the rectangles, and 
>>>>> interpolating
>>>>> the values between points of the triangles.
>>>>>
>>>>> # If you visualize cell values, there are no problem caused by 
>>>>> interpolating.
>>>>>
>>>>> The attached image is one of the solution.
>>>>> 1. read your data
>>>>> 2. make a 'fine resolution' Plane source with same size to the 
>>>>> original (for example, 200x100 structured grid)
>>>>> 3. apply Resample With Dataset filter
>>>>> The result looks nearly-symmetric for me.
>>>>>
>>>>>
>>>>> Magician
>>>>>
>>>>>
>>>>> On May 17, 2014, at 10:40, paraview-request at paraview.org 
>>>>> <mailto:paraview-request at paraview.org> wrote:
>>>>>
>>>>>> Date: Fri, 16 May 2014 20:40:18 -0500
>>>>>> From: Mikhail Artemyev <artemiev.mikhail at gmail.com 
>>>>>> <mailto:artemiev.mikhail at gmail.com>>
>>>>>> To: paraview at paraview.org <mailto:paraview at paraview.org>
>>>>>> Subject: [Paraview] non-symmetric representation of symmetric field
>>>>>> Message-ID: <5376BE02.7050800 at gmail.com 
>>>>>> <mailto:5376BE02.7050800 at gmail.com>>
>>>>>> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>>>>>>
>>>>>> Dear all,
>>>>>>
>>>>>> Here is a minimal example of values distributed over a mesh:
>>>>>>
>>>>>> 0------0------0------0------0
>>>>>> |        |        |         |        |
>>>>>> 0----0.5---0.75---0.5-----0
>>>>>> |        |        |         |        |
>>>>>> 0------0------1------0------0
>>>>>>
>>>>>> To visualize this field I wrote a .vts file:
>>>>>>
>>>>>> <?xml version="1.0"?>
>>>>>> <VTKFile type="StructuredGrid" version="0.1" 
>>>>>> byte_order="LittleEndian">
>>>>>>   <StructuredGrid WholeExtent="1 5 1 3 1 1">
>>>>>>     <Piece Extent="1 5 1 3 1 1">
>>>>>>       <PointData Scalars="scalars">
>>>>>>         <DataArray type="Float64" Name="sol_" format="ascii">
>>>>>> 0 0 1 0 0 0 0.5 0.75 0.5 0 0 0 0 0 0
>>>>>>         </DataArray>
>>>>>>       </PointData>
>>>>>>       <Points>
>>>>>>         <DataArray type="Float64" NumberOfComponents="3" 
>>>>>> format="ascii">
>>>>>> 0 0 0
>>>>>> 1 0 0
>>>>>> 2 0 0
>>>>>> 3 0 0
>>>>>> 4 0 0
>>>>>> 0 1 0
>>>>>> 1 1 0
>>>>>> 2 1 0
>>>>>> 3 1 0
>>>>>> 4 1 0
>>>>>> 0 2 0
>>>>>> 1 2 0
>>>>>> 2 2 0
>>>>>> 3 2 0
>>>>>> 4 2 0
>>>>>>         </DataArray>
>>>>>>       </Points>
>>>>>>     </Piece>
>>>>>>   </StructuredGrid>
>>>>>> </VTKFile>
>>>>>>
>>>>>> The visual representation of this field, however, doesn't look 
>>>>>> symmetric
>>>>>> (a figure is attached),
>>>>>> although the values are symmetric with respect to a Y-axis 
>>>>>> crossing the
>>>>>> center of the domain.
>>>>>>
>>>>>> Could you please shed some light on where I am wrong -
>>>>>> in my understanding of visualization technique, or in a way I 
>>>>>> pass the
>>>>>> data to ParaView?
>>>>>> I use ParaView 4.1.0 64-bit, Linux.
>>>>>>
>>>>>> Thank you.
>>>>>> Best regards,
>>>>>> Mikhail
> =
>
>

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