[vtkusers] vtkThreshold - multiple Input Ports?

[David E DeMarle]

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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