[Paraview] obtaining the color MAP transfer function

Fri Apr 13 05:56:02 EDT 2018

Andrei,

I'm able to generate valid results with the attached state file (use
File->Load State to test it)
Make sure to set the Sampling Dimensions correctly.

Best,

Mathieu Westphal

On Fri, Apr 13, 2018 at 11:44 AM, Andrei Cimpoeru <
andrei.cimpoeru at cfms.org.uk> wrote:

> Mathiew,
>
>
> Thanks a lot. That was very helpful.
> However when I use Resample to Image Filter it looks like my information
> is lost. I have attached the dataset so you can have a look.
>
> Best,
>
> Andrei
>
>
> On Fri, Apr 13, 2018 at 9:38 AM, Mathieu Westphal <
> mathieu.westphal at kitware.com> wrote:
>
>> Dear Andrei,
>>
>> Yes, the "Resample To Image" Filter is dedicated to this task. It will
>> allow convert you Unstructured Grid to a regular Image Data and allow you
>> to save your data as a .vti file.
>>
>> Best,
>>
>> Mathieu Westphal
>>
>> On Fri, Apr 13, 2018 at 10:35 AM, Andrei Cimpoeru <
>> andrei.cimpoeru at cfms.org.uk> wrote:
>>
>>> Dear Mathiew/David,
>>>
>>>
>>> Thanks a lot for you guidance. That was very helpful.
>>> I have seen that you also support VTI. I had a look at the structure of
>>> the format and it seems that this is a structured/rectilinear grid. The
>>> data that I am woking with right now is unstructured .pvd.
>>> Is there are way in Paraview to project/sample my unstructured dataset
>>> to a rectiliniar/structured grid so then I can export it to .VTI format?
>>>
>>> Many thanks and I am looking forward to hear from you.
>>>
>>> Best,
>>>
>>> Andrei
>>>
>>>
>>>
>>>
>>> On Thu, Apr 12, 2018 at 4:22 PM, David E DeMarle <
>>> dave.demarle at kitware.com> wrote:
>>>
>>>> You can export to cinema to get rendered images for which the data at
>>>> each pixel in the image is a floating point value not a color.
>>>>
>>>> David E DeMarle
>>>> Kitware, Inc.
>>>> Principal Engineer
>>>> 21 Corporate Drive
>>>> <https://maps.google.com/?q=21+Corporate+Drive+Clifton+Park,+NY+12065&entry=gmail&source=g>
>>>> Clifton Park, NY 12065
>>>> <https://maps.google.com/?q=21+Corporate+Drive+Clifton+Park,+NY+12065&entry=gmail&source=g>
>>>> -8662
>>>> Phone: 518-881-4909
>>>>
>>>> On Thu, Apr 12, 2018 at 11:13 AM, Mathieu Westphal <
>>>> mathieu.westphal at kitware.com> wrote:
>>>>
>>>>> Hello
>>>>>
>>>>> Please keep the ML in the cc so everyone can provide.
>>>>>
>>>>> You should be able to do that in the python shell.
>>>>>
>>>>> Views->Python Shell
>>>>>
>>>>> s = GetActiveSource()
>>>>> r=Show(s)
>>>>> l=r.LookupTable
>>>>> l.RGBPoints
>>>>>
>>>>>
>>>>> Best,
>>>>>
>>>>> Mathieu Westphal
>>>>>
>>>>> On Thu, Apr 12, 2018 at 3:14 PM, Andrei Cimpoeru <
>>>>> andrei.cimpoeru at cfms.org.uk> wrote:
>>>>>
>>>>>> Dear Mathieu,
>>>>>>
>>>>>> Please see the attached picture. I think that I can see a way to get
>>>>>> back to the original data. Is there a change to access the table with the *Color
>>>>>> Transfer Function Values?*
>>>>>>
>>>>>> Cheers,
>>>>>>
>>>>>> Andrei
>>>>>>
>>>>>> On Thu, Apr 12, 2018 at 2:10 PM, Mathieu Westphal <
>>>>>> mathieu.westphal at kitware.com> wrote:
>>>>>>
>>>>>>> Dear Andrei
>>>>>>>
>>>>>>> There is no way to guess the pressure values with only the RGB data.
>>>>>>> One can only guess the range and the color map used for generating the
>>>>>>> image.
>>>>>>> You will need to find the original data.
>>>>>>>
>>>>>>> Best,
>>>>>>>
>>>>>>> Mathieu Westphal
>>>>>>>
>>>>>>> On Thu, Apr 12, 2018 at 2:59 PM, Andrei Cimpoeru <
>>>>>>> andrei.cimpoeru at cfms.org.uk> wrote:
>>>>>>>
>>>>>>>>
>>>>>>>> Hi Mathieu,
>>>>>>>>
>>>>>>>> Thanks for getting back to me. Let's say that I have the image
>>>>>>>> below (attached). If you load it in Paraview  you have a vector field of
>>>>>>>> PNG consisting of RGB values. How do I turn these values back to pressure.
>>>>>>>> I am interested in this because I want to map the RGB colors back
>>>>>>>> to pressure field. Is there any way to this using vtk-python?
>>>>>>>>
>>>>>>>> Cheers,
>>>>>>>>
>>>>>>>> Andrei
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Thu, Apr 12, 2018 at 12:00 PM, Mathieu Westphal <
>>>>>>>> mathieu.westphal at kitware.com> wrote:
>>>>>>>>
>>>>>>>>> Dear Andrei,
>>>>>>>>>
>>>>>>>>> I'm not sure to follow what your are trying to achieve. Please
>>>>>>>>> explain again.
>>>>>>>>>
>>>>>>>>> In any case, the mapping between the pressure and the RGB values
>>>>>>>>> you see in paraview is controlled by
>>>>>>>>> the Color Map Editor and the range of the data. All these tools
>>>>>>>>> are accessible in the Toolbar visible in the attached image, I've
>>>>>>>>> highligthed the Color Editor button.
>>>>>>>>>
>>>>>>>>> Best regards,
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Mathieu Westphal
>>>>>>>>>
>>>>>>>>> On Thu, Apr 12, 2018 at 12:28 PM, Andrei Cimpoeru <
>>>>>>>>> andrei.cimpoeru at cfms.org.uk> wrote:
>>>>>>>>>
>>>>>>>>>> Hi ,
>>>>>>>>>>
>>>>>>>>>> I am currently working with Paraview  and deep learning models. I
>>>>>>>>>> have created a set of images (.png) using Paraview. The images are related
>>>>>>>>>> to the pressure field around a wing. When I load images back to Paraview
>>>>>>>>>> all I can visualise are the RGB  values.
>>>>>>>>>> *When the image are exported from Paraview the pressure field is
>>>>>>>>>> transferred into RGB values. Is there a way to obtain the function that
>>>>>>>>>> does that?*
>>>>>>>>>> Instead of exporting to .png a data format that I like is the
>>>>>>>>>> .vti. This format keep the current information about pressure, velocity,
>>>>>>>>>> mach number etc. Is there something that I could export a slice  to .vti?
>>>>>>>>>>
>>>>>>>>>>  Many thanks and I am looking forward to hear from you.
>>>>>>>>>>
>>>>>>>>>> Cheers,
>>>>>>>>>>
>>>>>>>>>> Andrei
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> *Andrei Cimpoeru* // CFD Engineer
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> <https://cfms.org.uk/news-events/events/2018/july/farnborough-international-airshow-2018/>
>>>>>>>>>>
>>>>>>>>>> *e: *andrei.cimpoeru at cfms.org.uk   *t*: 0117 906 1106   *w: *
>>>>>>>>>> www.cfms.org.uk
>>>>>>>>>> CFMS Services Ltd // Bristol & Bath Science Park // Dirac
>>>>>>>>>> Crescent // Emersons Green // Bristol // BS16 7FR
>>>>>>>>>>
>>>>>>>>>> CFMS Services Ltd is registered in England and Wales No 05742022
>>>>>>>>>> - a subsidiary of CFMS Ltd
>>>>>>>>>> CFMS Services Ltd registered office // 43 Queens Square //
>>>>>>>>>> Bristol // BS1 4QP
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> 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://public.kitware.com/mailman/listinfo/paraview
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> *Andrei Cimpoeru* // CFD Engineer
>>>>>>>>
>>>>>>>>
>>>>>>>> <https://cfms.org.uk/news-events/events/2018/july/farnborough-international-airshow-2018/>
>>>>>>>>
>>>>>>>> *e: *andrei.cimpoeru at cfms.org.uk   *t*: 0117 906 1106   *w: *
>>>>>>>> www.cfms.org.uk
>>>>>>>> CFMS Services Ltd // Bristol & Bath Science Park // Dirac Crescent
>>>>>>>> // Emersons Green // Bristol // BS16 7FR
>>>>>>>>
>>>>>>>> CFMS Services Ltd is registered in England and Wales No 05742022 -
>>>>>>>> a subsidiary of CFMS Ltd
>>>>>>>> CFMS Services Ltd registered office // 43 Queens Square // Bristol
>>>>>>>> // BS1 4QP
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> *Andrei Cimpoeru* // CFD Engineer
>>>>>>
>>>>>>
>>>>>> <https://cfms.org.uk/news-events/events/2018/july/farnborough-international-airshow-2018/>
>>>>>>
>>>>>> *e: *andrei.cimpoeru at cfms.org.uk   *t*: 0117 906 1106   *w: *
>>>>>> www.cfms.org.uk
>>>>>> CFMS Services Ltd // Bristol & Bath Science Park // Dirac Crescent //
>>>>>>  Emersons Green // Bristol // BS16 7FR
>>>>>>
>>>>>> CFMS Services Ltd is registered in England and Wales No 05742022 - a
>>>>>> subsidiary of CFMS Ltd
>>>>>> CFMS Services Ltd registered office // 43 Queens Square // Bristol
>>>>>> // BS1 4QP
>>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> 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://public.kitware.com/mailman/listinfo/paraview
>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>> *Andrei Cimpoeru* // CFD Engineer
>>>
>>>
>>> <https://cfms.org.uk/news-events/events/2018/july/farnborough-international-airshow-2018/>
>>>
>>> *e: *andrei.cimpoeru at cfms.org.uk   *t*: 0117 906 1106   *w: *
>>> www.cfms.org.uk
>>> CFMS Services Ltd // Bristol & Bath Science Park // Dirac Crescent // Emersons
>>> Green // Bristol // BS16 7FR
>>>
>>> CFMS Services Ltd is registered in England and Wales No 05742022 - a
>>> subsidiary of CFMS Ltd
>>> CFMS Services Ltd registered office // 43 Queens Square // Bristol //
>>> BS1 4QP
>>>
>>
>>
>
>
> --
> *Andrei Cimpoeru* // CFD Engineer
>
>
> <https://cfms.org.uk/news-events/events/2018/july/farnborough-international-airshow-2018/>
>
> *e: *andrei.cimpoeru at cfms.org.uk   *t*: 0117 906 1106   *w: *
> www.cfms.org.uk
> CFMS Services Ltd // Bristol & Bath Science Park // Dirac Crescent // Emersons
> Green // Bristol // BS16 7FR
>
> CFMS Services Ltd is registered in England and Wales No 05742022 - a
> subsidiary of CFMS Ltd
> CFMS Services Ltd registered office // 43 Queens Square // Bristol // BS1
> 4QP
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://public.kitware.com/pipermail/paraview/attachments/20180413/0d4a5170/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: sampling.pvsm
Type: application/octet-stream
Size: 258924 bytes
Desc: not available
URL: <https://public.kitware.com/pipermail/paraview/attachments/20180413/0d4a5170/attachment-0001.obj>