[vtkusers] vtkThreshold - multiple Input Ports?

Mon Nov 25 12:55:12 EST 2013

David,

Will the following work?

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();

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