[vtkusers] vtkThreshold - multiple Input Ports?
Bhanu Hariharan
bhanu at petrotel.com
Mon Nov 25 13:58:20 EST 2013
Thanks for the correction David.
One more question, if Array1 happens to have 3 components
(Array1.SetNumberofComponents(3) but Array2 only 1 component) would I still
be using AddArray like above?
That is on Viewport 1 I want to display a vector and Viewport 2 should be a
scalar.
Thanks,
Bhanu
On Mon, Nov 25, 2013 at 12:03 PM, David E DeMarle
<dave.demarle at kitware.com>wrote:
> You want TWO threshold filters, but otherwise yes that is the idea. See
> edits to the pseudocode below.
>
>
>> 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();
>>
>>
> ThresholdFilter2 = vtkThresholdFilter::New();
> Thresholdfilter2->SetInput(myUnstructuredGrid);
>
>
>
>> //Viewport 2
>> ===========
>> arrayname = "array2";
>>
>
> /*
>
>> Thresholdfilter->SetInputArrayToProcess(1, 0, 0,
>> vtkDataObject::FIELD_ASSOCIATION_CELLS, arrayname );
>>
> */
>
> Thresholdfilter2->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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