[vtkusers] SetActiveVectors when there are many pipelines that use different arrays
Dan Lipsa
dan.lipsa at kitware.com
Wed Nov 9 13:50:16 EST 2016
Fernando,
Great to hear that you found a solution.
Maybe mirroring the data would only be useful if you need to do additional
processing. Otherwise your solution is best.
Dan
On Wed, Nov 9, 2016 at 3:26 AM, Fernando Nellmeldin <
f.nellmeldin at open-engineering.com> wrote:
> Hello. Sorry for the delay.
> I couldn't find the source of the problem. It seemed like when I did the
> mirroring, one time the data was mirrored and the next time no. As I saw in
> the source code of vtkReflectionFilter, only the ActiveVectors are mirrored
> using reflection filter, and that is a limitation for what I would like to
> do (because I want to reflect all the vectorial data).
> Finally, the solution I found was to do the trick of mirroring
> graphically. This means that I mirror (duplicate and scale (1,-1,1)) the
> actors of my scene. This works like a charm, and it is faster than doing
> the reflection on the mesh..
>
> Anyway, problem solved!
> Thank you very much!
>
> On 27 October 2016 at 15:56, Dan Lipsa <dan.lipsa at kitware.com> wrote:
>
>> Hi Fernando,
>> I am not sure what is going on.
>> I would save VTK datasets at points in your pipeline to narrow down where
>> the problem is. For instance, save the datasets after the passarray filter.
>> Also save the datasets before and after your append filter that produces
>> the wrong result.
>> You can load those datasets in paraview and to see exactly what you get
>> after each filter.
>>
>> I use the following function in Python. You'll need to convert this to
>> C++.
>>
>> def debugWriteGrid(grid, name):
>> writer = vtk.vtkXMLDataSetWriter()
>> gridType = grid.GetDataObjectType()
>> if (gridType == vtk.VTK_STRUCTURED_GRID):
>> ext = ".vts"
>> elif (gridType == vtk.VTK_UNSTRUCTURED_GRID):
>> ext = ".vtu"
>> elif (gridType == vtk.VTK_POLY_DATA):
>> ext = ".vtp"
>> else:
>> print "Unknown grid type: %d" % gridType
>> ext = ".vtk"
>> writer.SetFileName(name + ext)
>> writer.SetInputData(grid)
>> writer.Write()
>>
>>
>>
>> On Thu, Oct 27, 2016 at 4:38 AM, Fernando Nellmeldin <
>> f.nellmeldin at open-engineering.com> wrote:
>>
>>> Hello, I am still having problems....
>>> I added the casting as you suggested:
>>>
>>> -----
>>> // given that model is first an UnstructuredGrid1 and then
>>> UnstructuredGridFull
>>> vtkSmartPointer<vtkPassArrays> passArrays =
>>> vtkSmartPointer<vtkPassArrays>::New();
>>> passArrays->SetInput(model);
>>> passArrays->UseFieldTypesOn(); // restrict to only pass what I say
>>> passArrays->AddFieldType(vtkDataObject::POINT);
>>> passArrays->AddArray(fieldType, "nameOfArray");
>>> passArrays->Update();
>>>
>>> // modelForFilter is a vtkUnstructuredGrid
>>> modelForFilter = vtkUnstructuredGrid::SafeDow
>>> nCast(passArrays->GetOutput()); // cast to UnstructuredGrid
>>> modelForFilter->GetPointData()->SetActiveVectors("nameOfArray"); // set
>>> the active vectors in the new data
>>> modelForFilter->Update();
>>>
>>> //warping vector is a vtkWarpVector
>>> warpingVector->SetInputConnection(modelForFilter->GetProducerPort());
>>> warpingVector->SetInputArrayToProcess(0, 0,
>>> 0, vtkDataObject::FIELD_ASSOCIATION_POINTS, "nameOfArray");
>>> // the rest of the pipeline is the same...
>>> -----
>>> The result is the same. I put some modelForFilter->Print(std::cout) and
>>> I can see that the selected array is indeed the active vectors...
>>>
>>> Other thing I tried:
>>> modelForFilter->DeepCopy(model); // full copy the model to the new
>>> modelForFilter->GetPointData()->SetActiveVectors("nameOfArray"); // set
>>> the active in the new
>>> modelForFilter->Update();
>>> Still, same result.
>>>
>>> The only thing that works is:
>>> modelForFilter = model;
>>> But of course, here I only copy the vtkSmartPointer and not the data, so
>>> this is the thing I want to avoid.
>>>
>>> Any ideas?
>>> Thank you!
>>>
>>> On 26 October 2016 at 16:54, Dan Lipsa <dan.lipsa at kitware.com> wrote:
>>>
>>>> Can you cast the data object to an unstructured grid and then set the
>>>> active vector on it? Make sure you call update before you do that.
>>>>
>>>> Dan
>>>>
>>>>
>>>> On Wed, Oct 26, 2016 at 10:44 AM, Fernando Nellmeldin <
>>>> f.nellmeldin at open-engineering.com> wrote:
>>>>
>>>>> Hello and thank you for your reply!
>>>>>
>>>>> After your suggestion, I tried using vtkPassArray, but I can't find
>>>>> how to set the Active Vectors. The output is a vtkDataObject*, which of
>>>>> course doesn't have the PointsData and therefore no setActiveVectors.
>>>>> The result is the same as before, when I change the input to Full, I
>>>>> see the wrong deformed mesh.
>>>>>
>>>>> This is my modified code:
>>>>>
>>>>> // given that model is first an UnstructuredGrid1 and then
>>>>> UnstructuredGridFull
>>>>> vtkSmartPointer<vtkPassArrays> passArrays =
>>>>> vtkSmartPointer<vtkPassArrays>::New();
>>>>> passArrays->SetInput(model);
>>>>> passArrays->UseFieldTypesOn(); // restrict to only pass what I say
>>>>> passArrays->AddFieldType(vtkDataObject::POINT);
>>>>> passArrays->AddArray(fieldType, "nameOfArray");
>>>>> passArrays->Update();
>>>>>
>>>>> //warping vector is a vtkWarpVector
>>>>> warpingVector->SetInputConnection(passArrays->GetProducerPort());
>>>>> warpingVector->SetInputArrayToProcess(0, 0,
>>>>> 0, vtkDataObject::FIELD_ASSOCIATION_POINTS, "nameOfArray"); // I
>>>>> don't know why this line is needed to see something
>>>>> // the rest of the pipeline is the same...
>>>>>
>>>>> Am I missing something?
>>>>>
>>>>> Thank you.
>>>>>
>>>>>
>>>>>
>>>>> On 26 October 2016 at 15:40, Dan Lipsa <dan.lipsa at kitware.com> wrote:
>>>>>
>>>>>> Fernando,
>>>>>> Can you try vtkPassArray to pass the proper vector array to each of
>>>>>> your pipelines? Then you can set the active vector on the output of this
>>>>>> algorithm.
>>>>>>
>>>>>> Dan
>>>>>>
>>>>>>
>>>>>> On Wed, Oct 26, 2016 at 6:23 AM, Fernando Nellmeldin <
>>>>>> f.nellmeldin at open-engineering.com> wrote:
>>>>>>
>>>>>>> Hello.
>>>>>>> I would like to show the deformed mesh of a model based on the
>>>>>>> values of a point data array of dimension 3 (vectorial data).
>>>>>>>
>>>>>>> I have the following pipeline:
>>>>>>> UnstructuredGrid1 -> WarpVector -> GeometryFilter -> ExtractEdges ->
>>>>>>> PolyDataMapper -> Actor
>>>>>>> In the WarpVector, I call to say which array to use
>>>>>>> WarpVector->SetInputArrayToProcess(0,0,0,
>>>>>>> FIELD_ASSOCIATION_POINTS,"nameOfArray");
>>>>>>>
>>>>>>> The first time I load the actor in screen, everything is OK.
>>>>>>>
>>>>>>> Later, I would like to mirror the input UnstructuredGrid1 because it
>>>>>>> represents half the model. So I do the following:
>>>>>>> UnstructuredGrid1 -> ReflectionFilter -> UnstructuredGrid2
>>>>>>> {UnstructuredGrid1, UnstructuredGrid2} -> AppendFilter ->
>>>>>>> UnstructuredGridFull
>>>>>>>
>>>>>>> Then, I replace the input of WarpVector by UnstructuredGridFull, and
>>>>>>> I reload the actor.
>>>>>>> However, what I see on screen is the same deformed mesh than before,
>>>>>>> plus another deformed mesh that is not its mirror, it's something different
>>>>>>> and not correct, of course.
>>>>>>>
>>>>>>> If, however, I call:
>>>>>>> At the beginning: UnstructuredGrid1->GetPointDat
>>>>>>> a()->SetActiveVectors("nameOfArray");
>>>>>>> After I did the mirroring: UnstructuredGridFull->GetPoint
>>>>>>> Data()->SetActiveVectors("nameOfArray");
>>>>>>> I don't have the problem and everything works OK.
>>>>>>>
>>>>>>> Problem is, I don't want to call setActiveVectors because I can have
>>>>>>> more than one pipeline that makes uses of the same UnstructuredGrid with
>>>>>>> different vectorial data, and I noticed that each call to setActive* will
>>>>>>> modify all the pipelines that makes use of the Scalars/Vectors/Tensors. So
>>>>>>> this doesn't seem an option.
>>>>>>>
>>>>>>> What is the alternative to use here to solve the problem?
>>>>>>>
>>>>>>> I tried with vtkAssignAttributes but didn't work.
>>>>>>> vtkSmartPointer<vtkAssignAttribute> aa =
>>>>>>> vtkSmartPointer<vtkAssignAttribute>::New();
>>>>>>> aa->SetInput(UnstructuredGridFull);
>>>>>>> aa->Assign("nameOfArray", vtkDataSetAttributes::VECTORS,
>>>>>>> vtkAssignAttribute::POINT_DATA);
>>>>>>> aa->Update();
>>>>>>>
>>>>>>> And then:
>>>>>>> AssignAttribute -> WarpVector instead of UnstructuredGridFull ->
>>>>>>> WarpVector.
>>>>>>> but same result...
>>>>>>>
>>>>>>> Thank you.
>>>>>>>
>>>>>>> --
>>>>>>> *Fernando NELLMELDIN*
>>>>>>> Software Engineer
>>>>>>> *_______________________________________________________________*
>>>>>>>
>>>>>>> *Open Engineering s.a.*
>>>>>>>
>>>>>>> Rue Bois Saint-Jean 15/1
>>>>>>> B-4102 Seraing (Belgium)
>>>>>>> Tel: +32.4.353.30.34
>>>>>>>
>>>>>>> http://www.open-engineering.com
>>>>>>> https://www.linkedin.com/company/open-engineering?trk=biz-co
>>>>>>> mpanies-cym
>>>>>>>
>>>>>>>
>>>>>>> *_________________________________________________________________________*
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>>
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>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> *Fernando NELLMELDIN*
>>>>> Software Engineer
>>>>> *_______________________________________________________________*
>>>>>
>>>>> *Open Engineering s.a.*
>>>>>
>>>>> Rue Bois Saint-Jean 15/1
>>>>> B-4102 Seraing (Belgium)
>>>>> Tel: +32.4.353.30.34
>>>>>
>>>>> http://www.open-engineering.com
>>>>> https://www.linkedin.com/company/open-engineering?trk=biz-co
>>>>> mpanies-cym
>>>>>
>>>>>
>>>>> *_________________________________________________________________________*
>>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> *Fernando NELLMELDIN*
>>> Software Engineer
>>> *_______________________________________________________________*
>>>
>>> *Open Engineering s.a.*
>>>
>>> Rue Bois Saint-Jean 15/1
>>> B-4102 Seraing (Belgium)
>>> Tel: +32.4.353.30.34
>>>
>>> http://www.open-engineering.com
>>> https://www.linkedin.com/company/open-engineering?trk=biz-companies-cym
>>>
>>>
>>> *_________________________________________________________________________*
>>>
>>
>>
>
>
> --
> *Fernando NELLMELDIN*
> Software Engineer
> *_______________________________________________________________*
>
> *Open Engineering s.a.*
>
> Rue Bois Saint-Jean 15/1
> B-4102 Seraing (Belgium)
> Tel: +32.4.353.30.34
>
> http://www.open-engineering.com
> https://www.linkedin.com/company/open-engineering?trk=biz-companies-cym
>
> *_________________________________________________________________________*
>
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