[vtkusers] SetActiveVectors when there are many pipelines that use different arrays

Thu Oct 27 04:38:26 EDT 2016

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::SafeDownCast(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<vtkAssignAttri
>>>> bute>::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-companies-cym
>>>>
>>>>
>>>> *_________________________________________________________________________*
>>>>
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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-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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