[vtkusers] vtkThreshold - multiple Input Ports?

[Bhanu Hariharan]

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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