[Paraview-developers] apply a filter to only a selected block

[Utkarsh Ayachit]

I am not sure I'd recommend anyone to do this :), but since you're
experimenting .. here's something to try:

Don't do the SetInputDataObject() in RequestInformation, try passing
the output of ExtractBlock to the input in RequestData() instead.

Utkarsh

On Wed, Aug 27, 2014 at 10:03 AM, Felipe Bordeu
<felipe.bordeu at ec-nantes.fr> wrote:
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> Hi,
>
> I'm writing a filter to apply a filter(for example a cut, or clip ) to
> only a selected block of a vtkMultiBlockData.
>
> So I start reading the implementation of the vtkExtractBlock and
> vtkPVGlyphFilter (because I what to select interactively the filter to
> apply in the same way we can choose the type of glyph).
>
> Now the problematic point. This is the  part of the xml to select the
> filter to apply (in the same way as the glyph filter) :
>
>
> <InputProperty command="SetalgoToApply"
>                label="Filter To Apply"
>                 name="Source">
>
>     <ProxyGroupDomain name="groups">
>         <Group name="filters" />
>     </ProxyGroupDomain>
>
>     <DataTypeDomain name="input_type" composite_data_supported="1">
>         <DataType value="vtkDataObject" />
>     </DataTypeDomain>
>
>     <ProxyListDomain name="proxy_list">
>         <Proxy group="filters" name="Cut" />
>         <!-- More filter here -->
>     </ProxyListDomain>
> </InputProperty>
>
> The interface is generated correctly in paraview.
> In the code a receive the algorithm with this function
>
> vtkfiltertest::vtkSetMacro(algoToApply, vtkAlgorithmOutput*);
>
>
> But I don't know how to set the input to the algorithm.
>
> I tried this (vtkDataSet* tmpinput  is a pointer to some data, )
>
> void vtkfiltertest::SetalgoToApply (vtkAlgorithmOutput* _arg) {
>    if (this->algoToApply != _arg) {
>      this->algoToApply = _arg;
>      this->algoToApply->GetProducer()->SetInputDataObject(0,tmpinput);
>      this->Modified();
>    }
> }
>
> and also in
> vtkfiltertest::RequestInformation(){
> ...
> this->algoToApply->GetProducer()->SetInputDataObject(0,tmpinput);
> ..
> }
>
> but in paraview when I create the vtkfiltertest (click in the menu) I
> get this:
>
> ERROR: In
> /Big/fbordeu/sources/ParaView4/VTK/Common/ExecutionModel/vtkDemandDrivenPipeline.cxx,
> line 710
> vtkPVCompositeDataPipeline (0x7845e80): Input port 0 of algorithm
> vtkPVMetaSliceDataSet(0x783d880) has 0 connections but is not optional.
>
> Is this possible of I'm asking to much???
>
> Thanks.
> - --
> Felipe Bordeu Weldt
> Ingénieur de Recherche
> - -------------------------------------
> Tél. : 33 (0)2 40 37 16 57
> Fax. : 33 (0)2 40 74 74 06
> Felipe.Bordeu at ec-nantes.fr
> Institut GeM - UMR CNRS 6183
> École Centrale Nantes
> 1 Rue de La Noë, 44321 Nantes, FRANCE
> - -------------------------------------
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