[Paraview-developers] How to implement an identity filter ?
houssen
houssen at ipgp.fr
Sun Jul 19 16:54:29 EDT 2015
Finally working ! Thanks !
I guess my mistake was to do the shallow copy in RequestDataObject, not
in RequestData.
Franck
Le 2015-07-19 21:25, Joachim Pouderoux a écrit :
> Franck,
>
> What do you do in RequestData()? You are supposed to shallow copy
> input to the output, right?
>
> Joachim
>
> JOACHIM POUDEROUX
>
>> _PhD, Technical Expert_
>
> 2015-07-19 19:53 GMT+02:00 houssen <houssen at ipgp.fr [35]>:
>
>> Still get the zero filter ?!... Don't understand !? If somebody has
>> an idea ?... Something to check ? Verify ? Track ? Something
> missing
>> ? Add tag in xml ? Missing rendering call ?
>>
>> Now, I derive from vtkDataObjectAlgorithm, I re-implement only
>> RequestDataObject. I tried without success to create a new instance
>> (from pInputObj) to pass to pOutputInfo (with and without using
>> DeepCopy) : finally I tried to pass directly pInputObj. In the GUI,
>> in the information tab, I get the expected type but zero point /
>> cell. When I delete the filter, the initial data are still here
> (tab
>> info indicates non zero number of points / cells) but the 3D
>> viewpoint is empty : can this be a clue of some problem ?
>>
>> Franck
>>
>> int myFilter::RequestDataObject ( vtkInformation * ipRequest,
>> vtkInformationVector ** ipInputVector, vtkInformationVector *
>> opOutputVector )
>> {
>> if ( !ipRequest ) return 0;
>>
>> vtkInformation * pInputInfo = ( ipInputVector ) ?
>> ipInputVector[0] -> GetInformationObject ( 0 ) :
>> NULL;
>> vtkDataObject * pInputObj = ( pInputInfo ) ?
>> pInputInfo -> Get ( vtkDataObject::DATA_OBJECT () ) :
>> NULL;
>> if ( pInputObj )
>> {
>> vtkInformation * pOutputInfo = ( opOutputVector ) ?
>> opOutputVector -> GetInformationObject ( 0 ) :
>> NULL;
>> vtkDataObject * pOutputObj = ( pOutputInfo ) ?
>> pOutputInfo -> Get ( vtkDataObject::DATA_OBJECT () ) : NULL;
>> if ( !pOutputObj )
>> {
>> _OutputDataType = pInputObj -> GetClassName (); // For
>> later call to FillOutputPortInformation
>> pOutputInfo -> Set ( vtkDataObject::DATA_OBJECT (),
>> pInputObj );
>> return 1;
>> }
>> }
>> return 0;
>> }
>>
>> int myFilter::FillOutputPortInformation ( int iPort,
>> vtkInformation * ipInfo )
>> {
>> if ( ipInfo ) ipInfo -> Set ( vtkDataObject::DATA_TYPE_NAME (),
>> _OutputDataType.c_str () ); // Output data type to create (called
>> after ProcessRequest)
>> return 1;
>> }
>>
>> Le 2015-07-15 23:49, houssen a écrit :
>>
>>> Shawn, Joachim, thanks.
>>> After a quick look at the code, if I got you right, on a
>>> REQUEST_DATA_OBJECT request, I still need to create a new
>>> instance of
>>> the input and to set it as the DATA_OBJECT of the vtkInfo of the
>>> output. I still have to test this, but, I got the idea !
>>>
>>> Franck
>>>
>>> Le 2015-07-15 15:47, Shawn Waldon a écrit :
>>>
>>>> You might want to take a look at inheriting from
>>>> vtkPassInputTypeAlgorithm[1] if you want the output type to be
>>>> the
>>>> same as the input type. It already implements
>>>> RequestDataObject the
>>>> way that I think Joachim is suggesting.
>>>>
>>>> HTH,
>>>> Shawn
>>>>
>>>> [1]:
>>>>
>>>>
>>>>
>>>
>>
>
> http://www.vtk.org/doc/nightly/html/classvtkPassInputTypeAlgorithm.html
>>>> [14]
>>>> [14]
>>>>
>>>> On Wed, Jul 15, 2015 at 7:27 AM, Joachim Pouderoux
>>>> <joachim.pouderoux at kitware.com [15] [15]> wrote:
>>>>
>>>>> Franck,
>>>>>
>>>>> You will have to override the RequestDataObject() method in
>>>>> order
>>>>> to make your filter generic. This method is the one called
>>>>> to
>>>>> generate the output data object.
>>>>> Take a look at vtkGenerateIndexArray.cxx for instance, I
>>>>> think you
>>>>> can just copy it in your class (which should be derivated
>>>>> from
>>>>> vtkDataObjectAlgorithm).
>>>>>
>>>>> Best,
>>>>>
>>>>> JOACHIM POUDEROUX
>>>>>
>>>>>> _PhD, Technical Expert_
>>>>>
>>>>> 2015-07-15 11:57 GMT+02:00 houssen <houssen at ipgp.fr [1]
>>>>> [9]>:
>>>>>
>>>>>> Seems that it is not possible to filter on vtkDataObject
>>>>>> type.
>>>>>> But with less generic types (like vtkUnstrucutredGrid for
>>>>>> instance), the myFilter works : no error occur, but,
>>>>>> viewpoint
>>>>>> ends up to be empty. I get "zero" instead of "identity" :
>>>>>> why ?!
>>>>>>
>>>>>> Franck
>>>>>>
>>>>>> Le 2015-07-14 23:38, houssen a écrit :
>>>>>>
>>>>>>> How to write an identity filter ? (1 input port, 1 output
>>>>>>> port,
>>>>>>> output = input whatever input may be)
>>>>>>>
>>>>>>> I need to write a custom filter. I am used to VTK "from
>>>>>>> outside"
>>>>>>> (creating/handling vtk pipelines/scene/object from a
>>>>>>> main
>>>>>>> program)
>>>>>>> that is basically without the need to understand all
>>>>>>> internal
>>>>>>> VTK
>>>>>>> mechanics (except the SetInputConnection concept). I am
>>>>>>> not
>>>>>>> yet used
>>>>>>> to VTK internal mechanics that is necessary for writing
>>>>>>> a
>>>>>>> ParaView
>>>>>>> plugin.
>>>>>>>
>>>>>>> I need my filter to do "complex" stuffs. As I couldn't
>>>>>>> make it
>>>>>>> work,
>>>>>>> I simplified as much as possible to obtain finally an
>>>>>>> identity
>>>>>>> filter
>>>>>>> (!) : this is still not working. I feel I still miss
>>>>>>> something
>>>>>>> from
>>>>>>> VTK internal mechanics.
>>>>>>>
>>>>>>> As far as I understand, in the constructor, I need :
>>>>>>> myFilter::myFilter () { SetNumberOfInputPorts ( 1 );
>>>>>>> SetNumberOfOutputPorts ( 1 ); }
>>>>>>>
>>>>>>> So then I need to implement the FillXXXPortInformation :
>>>>>>> int myFilter::FillInputPortInformation ( int vtkNotUsed
>>>>>>> (
>>>>>>> iPort ),
>>>>>>> vtkInformation * ipInfo )
>>>>>>> {
>>>>>>> if ( ipInfo ) ipInfo -> Set (
>>>>>>> vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE (),
>>>>>>> "vtkDataObject" );
>>>>>>> //
>>>>>>> Filter allowed data types
>>>>>>> return 1;
>>>>>>> }
>>>>>>> int myFilter::FillOutputPortInformation ( int vtkNotUsed
>>>>>>> (
>>>>>>> iPort ),
>>>>>>> vtkInformation * ipInfo )
>>>>>>> {
>>>>>>> if ( ipInfo ) ipInfo -> Set (
>>>>>>> vtkDataObject::DATA_TYPE_NAME
>>>>>>> (),
>>>>>>> "vtkDataObject" ); // Output data type to be created
>>>>>>> return 1;
>>>>>>> }
>>>>>>>
>>>>>>> So, now I only need to implement the ProcessRequest
>>>>>>> gateway:
>>>>>>> int myFilter::ProcessRequest ( vtkInformation *
>>>>>>> ipRequest,
>>>>>>> vtkInformationVector ** ipInputVector,
>>>>>>> vtkInformationVector *
>>>>>>> opOutputVector )
>>>>>>> {
>>>>>>> if ( ipRequest && ipRequest -> Has (
>>>>>>> vtkDemandDrivenPipeline::REQUEST_DATA () ) )
>>>>>>> if ( ipInputVector && opOutputVector )
>>>>>>> opOutputVector =
>>>>>>> ipInputVector[0];
>>>>>>> return Superclass::ProcessRequest ( ipRequest,
>>>>>>> ipInputVector,
>>>>>>> opOutputVector );
>>>>>>> }
>>>>>>>
>>>>>>> I believed that I would be the only steps to proceed to
>>>>>>> get an
>>>>>>> identity filter. When I use my identity filter in
>>>>>>> Paraview, I
>>>>>>> get
>>>>>>> errors like :
>>>>>>> ERROR: In
>>>>
>>>>
>>>>
>>>
>>
>
> /.../ParaView-v4.3.1-source/VTK/Common/ExecutionModel/vtkDemandDrivenPipeline.cxx,
>>>>
>>>>>>> line 810
>>>>>>> vtkPVPostFilterExecutive : Input for connection index 0
>>>>>>> on
>>>>>>> input port
>>>>>>> index 0 for algorithm vtkPVPostFilter(0x16d0ec0) is of
>>>>>>> type
>>>>>>> vtkDataObject, but a vtkPolyData is required.
>>>>>>>
>>>>>>> Some logic is still missing here : could somebody
>>>>>>> explain me
>>>>>>> what and why ?
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Franck
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>
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>>
>
> http://www.vtk.org/doc/nightly/html/classvtkPassInputTypeAlgorithm.html
>>>> [29]
>>>> [15] mailto:joachim.pouderoux at kitware.com [30]
>>
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