[vtkusers] vtkThreshold - multiple Input Ports?

[David E DeMarle]

You want TWO threshold filters, but otherwise yes that is the idea. See
edits to the pseudocode below.


> Array1.Setname("array1");
> myUnstructuredGrid.AddArray(Array1);
>
> Array2.Setname("array2");
> myUnstructuredGrid.AddArray(Array2);
>
>
> Thresholdfilter.SetInput(myUnstructuredGrid);
>
> //Viewport 1
> ==============
>
> arrayname = "array1";
> Thresholdfilter->SetInputArrayToProcess(0, 0, 0,
> vtkDataObject::FIELD_ASSOCIATION_CELLS, arrayname );
> //Set Mapper1 and Actor1 etc.
> Viewport1 -> Render();
>
>
ThresholdFilter2 = vtkThresholdFilter::New();
Thresholdfilter2->SetInput(myUnstructuredGrid);


> //Viewport 2
> ===========
> arrayname = "array2";
>

/*

> Thresholdfilter->SetInputArrayToProcess(1, 0, 0,
> vtkDataObject::FIELD_ASSOCIATION_CELLS, arrayname );
>
*/

Thresholdfilter2->SetInputArrayToProcess(1, 0, 0,
vtkDataObject::FIELD_ASSOCIATION_CELLS, arrayname );

//Set Mapper2 and Actor2 etc.
> Viewport2 -> Render();
>
>
> Thanks,
> Bhanu
>
>
>
> On Mon, Nov 25, 2013 at 11:45 AM, David E DeMarle <
> dave.demarle at kitware.com> wrote:
>
>> Instead of calling data->SetScalars() to put the array choice on the data
>> call filter->SetInputArrayToProcess() to put the array choice onto each
>> filter.
>>
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4909
>>
>>
>> On Mon, Nov 25, 2013 at 9:31 AM, Bhanu Hariharan <bhanu at petrotel.com>wrote:
>>
>>> Thanks David for the suggestion of Branching pipeline. Are there any vtk
>>> examples for branching a pipeline.
>>>
>>> I had previously attempted to do something like this
>>>
>>> //Viewport 1
>>> myUnstructuredGrid.SetScalars(Array1);
>>>
>>> Thresholdfilter1.SetInput(myUnstructuredGrid);
>>> //Set Mapper1 and Actor1 etc.
>>> Viewport1 -> Render();
>>>
>>> //Viewport 2
>>> myUnstructuredGrid.SetScalars(Array2);
>>>
>>> Thresholdfilter2.SetInput(myUnstructuredGrid);
>>> //Set Mapper2 and Actor2 etc.
>>> Viewport2 -> Render();
>>>
>>> But I ended up getting same rendering in both - i.e. Array2 in both
>>> viewports. Should I have seen different in both viewports? But if I made a
>>> deep copy of myUnstructuredGrid and used that for Thresholdfilter2, then I
>>> got Array 1 in Viewport 1 and Array 2 in viewport 2. Obviously I do not
>>> want to make a copy of myUnstructuredGrid as it can be  huge.
>>>
>>> Did you mean to suggest something different?
>>>
>>> Thanks,
>>> Bhanu
>>>
>>>
>>>
>>> On Mon, Nov 25, 2013 at 7:56 AM, David E DeMarle <
>>> dave.demarle at kitware.com> wrote:
>>>
>>>> The number of inputs that the threshold filter accepts cannot be
>>>> changed, without rewriting it that is.
>>>>
>>>> Instead, think about making a branching pipeline, that is sending your
>>>> unstructured grid into multiple threshold filters, the output of each is to
>>>> be rendered independently.
>>>>
>>>>
>>>> David E DeMarle
>>>> Kitware, Inc.
>>>> R&D Engineer
>>>> 21 Corporate Drive
>>>> Clifton Park, NY 12065-8662
>>>> Phone: 518-881-4909
>>>>
>>>>
>>>> On Thu, Nov 21, 2013 at 3:22 PM, Bhanu Hariharan <bhanu at petrotel.com>wrote:
>>>>
>>>>> Dear vtk-users,
>>>>>
>>>>> I am trying to do set up multiple Input Ports for a vtkThreshold type
>>>>> of filter.
>>>>> Input to the threshold filter is a vtkUnstructuredGrid.
>>>>>
>>>>> My code looks like
>>>>>
>>>>> myThresholdfilter.SetInput(port0, myUnstructuredGrid);
>>>>> myThresholdfilter.SetInput(port1, myUnstructuredGrid);
>>>>>
>>>>>
>>>>> I would like to setup multiple viewports in my rendering window and in
>>>>> each viewport I would like a different grid property rendered. The grid
>>>>> property is a scalar array added to myUnstructuredGrid.
>>>>>
>>>>> (I thought I can render different image in different viewports this
>>>>> way - I may be wrong here to begin with so if anyone wants to correct me
>>>>> here please feel free).
>>>>>
>>>>> At run time as soon as the debugger hits the line
>>>>> myThresholdfilter.SetInput(port1, myUnstructuredGrid);
>>>>> it complaints that I attempted to use port index 1 when number of
>>>>> ports is 1.
>>>>>
>>>>> I can't even seem to do
>>>>> myThresholdfilter.SetNumberofInputPorts();
>>>>> as this is a protected method.
>>>>>
>>>>> How do I set up multiple input ports for a vtkThreshold filter. Please
>>>>> if anyone can shed some light on it, it would be a great help as I have
>>>>> spent a lot of time on it trying this and that without any luck.
>>>>>
>>>>> Thanks in advance,
>>>>> Bhanu
>>>>>
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