[vtkusers] vtkThreshold - multiple Input Ports?

[Bhanu Hariharan]

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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