[Paraview] [EXTERNAL] Plotting data to an existing model's surface

[David E DeMarle]

Filters->Programmable Filter

Copy and paste the text into the Script entry field then hit Apply.

vtkSurfaceReconstruction doesn't have the concave shape limitation that
Delaunay has - but it isn't a perfect mesh of the surface either. Perhaps
the vtk or paraview mailing lists contain a better alternative to either.



David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Mon, Jan 26, 2015 at 10:14 AM, Mark Belan <belanma at mcmaster.ca> wrote:

> Hi David,
>
> Thanks for your suggestion. I was able to successfully render my points in
> a .csv file into specific points on the model (thanks Alan!), but I'm not
> sure how to go about the next steps into turning the points into a mesh and
> thus interpolating.
>
> Where can I input these python commands in paraview? I'm afraid my skills
> in programming are minimal.
>
> Thanks for your help,
>
> - Mark
>
> On Fri, Jan 23, 2015 at 4:24 PM, David E DeMarle <dave.demarle at kitware.com
> > wrote:
>
>> After you
>>
>> 1) get the list of points and values in the csv file:
>> x,y,z,val1,val2,…
>> 2) read into paraview and converted from a table to a vtkpointset as Alan
>> suggested
>> 3) try the vtkSurfaceReconstruction filter to convert it into a mesh.
>> That isn't exposed in ParaView (maybe not parallel aware) so use this
>> python programmable filter to do use it:
>>
>> import vtk
>>
>> pdi = self.GetPolyDataInput()
>>
>>
>> subf1 = vtk.vtkSurfaceReconstructionFilter()
>>
>> subf1.SetInputData(pdi)
>>
>> subf2 = vtk.vtkContourFilter()
>>
>> subf2.SetInputConnection(subf1.GetOutputPort())
>>
>> subf2.SetValue(0, 0.0)
>>
>> subf2.Update()
>>
>>
>> pdo =  self.GetPolyDataOutput()
>>
>> pdo.ShallowCopy(subf2.GetOutput())
>>
>> ParaView will then happily interpolate values across the faces of the mesh
>>
>>
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4909
>>
>> On Fri, Jan 23, 2015 at 3:51 PM, Scott, W Alan <wascott at sandia.gov>
>> wrote:
>>
>>>  Mark,
>>>
>>> I don’t know the answer to your question, but a few years ago I wrote a
>>> wiki page on converting .csv file data into points and structured grids.
>>> The write-up is here:  http://www.paraview.org/Wiki/Data_formats.  Hope
>>> that helps.
>>>
>>>
>>>
>>> Alan
>>>
>>>
>>>
>>> *From:* ParaView [mailto:paraview-bounces at paraview.org] *On Behalf Of *Mark
>>> Belan
>>> *Sent:* Thursday, January 22, 2015 9:50 AM
>>> *To:* paraview at paraview.org
>>> *Subject:* [EXTERNAL] [Paraview] Plotting data to an existing model's
>>> surface
>>>
>>>
>>>
>>> Hello all,
>>>
>>> I'm a graduate student in geology trying to do some visual data work,
>>> but I'm afraid my inexperience with paraview is making things a bit
>>> difficult for me.
>>>
>>> Essentially what I'm trying to create is a 3D model of a rock that has
>>> its surface coloured to show spatial distribution of a physical property
>>> associated with certain areas on the rock.
>>>
>>> I was able to reproduce the rock I sample from using a 3D scanner but I
>>> have no idea how to go about selecting particular areas of the rock's
>>> surface, assigning a value to that "area", and having the program
>>> interpolate between multiple "areas". Essentially I'd like this to produce
>>> a color gradient showcasing the changing values.
>>>
>>> Can anyone offer some guidance/direction? I had someone at my campus
>>> suggest creating a .csv file with x,y,z coordinates of the particular areas
>>> of the model of interest, but after doing that all I've produced are
>>> "points"...not sure how to specify the association to the model and color
>>> and interpolation, etc.
>>>
>>> Thanks for any help,
>>>
>>> - Mark
>>> --
>>>
>>> *Mark Belan*, B. Art Sc.
>>> *M. Sc. Candidate - Astrobiology*
>>>
>>> *Lewis and Ruth Sherman Graduate Fellow*
>>>
>>> McMaster University
>>>
>>> School of Geography and Earth Sciences
>>>
>>> GSB 323
>>> 1280 Main Street West
>>> Hamilton, Ontario
>>> Canada
>>> L8S 4L8
>>>
>>> *Art*: www.markbelan.com
>>>
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>>
>
>
> --
> *Mark Belan*, B. Art Sc.
> *M. Sc. Candidate - Astrobiology*
> *Lewis and Ruth Sherman Graduate Fellow*
> McMaster University
> School of Geography and Earth Sciences
> GSB 323
> 1280 Main Street West
> Hamilton, Ontario
> Canada
> L8S 4L8
>
> *Art*: www.markbelan.com
>
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