[Paraview] Custom Python plugin with multiple input ports

[Utkarsh Ayachit]

The attached patch for vtkPythonProgrammableFilter along with a minor tweak
to your plugin XML does the trick. I can have this cleaned up and merged in
"master" for 5.2 if that's acceptable.

Utkarsh

On Fri, Jul 15, 2016 at 3:20 PM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> Doh! I forgot that the number of ports need to set in the constructor of
> the vtkAlgorithm subclass. Grr...let me see if there's a workaround. I'll
> get back to you on it.
>
> On Fri, Jul 15, 2016 at 2:37 PM, LB <bravo.loic at gmail.com> wrote:
>
>> Hi Utkarsh,
>>
>> Multiple input ports are exactly what I want.
>> But I can't get it to work. I've attached my last XML plugin attempt with
>> different port_index definition.
>>
>> When I try to use it, I have the following error:
>>
>> /ParaViewVTK/Common/ExecutionModel/vtkAlgorithm.cxx, line 893
>>
>> vtkPythonProgrammableFilter (0x6c7a510): Attempt to connect input port
>> index 1 for an algorithm with 1 input ports.
>>
>> Should I add something to tell ParaView that this filter has multiple
>> input ports?
>> Should I use a different class than the vtkPythonProgrammableFilter?
>>
>> Regards,
>> --
>> Loïc
>>
>> 2016-07-15 17:36 GMT+02:00 Utkarsh Ayachit <utkarsh.ayachit at kitware.com>:
>>
>>> Sorry for chiming in late, but here are some things to note:
>>>
>>> * Both Dennis and Cory are talking about multiple connections on the
>>> same input port. This is arguably not too well supported since the
>>> order cannot be determined easily.
>>> * Seems to me you want multiple input ports, each with a single
>>> connection. That's supported. Just not by the Python Filter Generator
>>> Script. Once you have the XML for the filter, you can indeed just add
>>> another <InputProperty /> tag to it as follows (note the "port_index"
>>> attribute):
>>>
>>> <InputProperty command="SetInputConnection"
>>>                          name="Input2"
>>>                          port_index="2">
>>>    <!-- fill with relevant domain information -->
>>> </InputProperty>
>>>
>>> Then, your python filter code can access data on each input port as:
>>>
>>> input1 = self.GetInputDataObject(0, 0)
>>> input2 = self.GetInputDataObject(1, 0)
>>>
>>> Here there's no confusion which data is on which input port.
>>>
>>> Hope that helps,
>>> Utkarsh
>>>
>>>
>>> On Fri, Jul 15, 2016 at 7:44 AM, Dennis Conklin
>>> <dennis_conklin at goodyear.com> wrote:
>>> > LB,
>>> >
>>> >
>>> >
>>> > Yes, it is troublesome to not be able to tell which input is which
>>> inside
>>> > the Programmable filter.     Something I have done in the past is
>>> > differentiate them inside the filter.   I have tested for element type
>>> to
>>> > tell them apart, for example.  Something else I have heard of but have
>>> not
>>> > had to use is assigning a unique variable to one input and then
>>> testing for
>>> > that inside the filter to determine which input is which.
>>> >
>>> >
>>> >
>>> > None of this may address  your general problem, but here’s hoping.
>>> >
>>> >
>>> >
>>> > Dennis
>>> >
>>> >
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>>
>>
>
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