[vtkusers] vtkThreshold - multiple Input Ports?

[David E DeMarle]

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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>>
>
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