[vtkusers] Input Issue

[Bill Lorensen]

Please keep the vtk users list in the replies...

Is there an array called Distances in your polydata?

Try printing the polydata:
polydata->Print(std::cout);



On Thu, Jul 18, 2013 at 4:01 PM, rahul indoria <rahulindoria5 at gmail.com>wrote:

> *Hi,*
> *    I am trying to modify my example something like that in main
> function to access the point data. can you check it???? *
>
>
>
>  // Verify arguments
>   if (argc < 4)
>     {
>       std::cout << "Usage: " << argv[0]
>                 << " InputVolume PolyDataInput"
>                 << " Resolution"
>                 << std::endl;
>       return EXIT_FAILURE;
>     }
>
>   // Parse arguments
>   std::string volumeFileName = argv[1];
>   std::string polyDataFileName = argv[2];
>   std::stringstream ssResolution;
>   ssResolution << argv[3];
>   unsigned int resolution;
>   ssResolution >> resolution;
>
>   // Output arguments
>   std::cout << "InputVolume: " << volumeFileName << std::endl
>             << "PolyDataInput: " << polyDataFileName << std::endl
>             << "Resolution: " << resolution << std::endl;
>
>   // Read the volume data
>   vtkSmartPointer< vtkImageReader2Factory > imageFactory =
>     vtkSmartPointer< vtkImageReader2Factory >::New();
>   vtkImageReader2 *imageReader =
>   imageFactory->CreateImageReader2(volumeFileName.c_str());
>   imageReader->SetFileName(volumeFileName.c_str());
>   imageReader->Update();
>
>   // Read the Polyline
>   vtkSmartPointer<vtkPolyDataReader> polyLineReader =
>     vtkSmartPointer<vtkPolyDataReader>::New();
>   polyLineReader->SetFileName(polyDataFileName.c_str());
>   polyLineReader->Update();
>
>   vtkSmartPointer<vtkSplineFilter> spline =
>     vtkSmartPointer<vtkSplineFilter>::New();
>   spline->SetInputConnection(polyLineReader->GetOutputPort());
>   spline->SetSubdivideToSpecified();
>   spline->SetNumberOfSubdivisions(resolution);
>
>   // Sweep the line to form a surface
>   double direction[3];
>   direction[0] = 0.0;
>   direction[1] = 0.0;
>   direction[2] = 1.0;
>   double distance = 164;
>   spline->Update();
>   vtkSmartPointer<vtkPolyData> surface =
>     SweepLine(spline->GetOutput(),
>               direction,
>               distance,
>               atoi(argv[3]));
>
>   // Probe the volume with the extruded surface
>   vtkSmartPointer<vtkProbeFilter> sampleVolume =
>     vtkSmartPointer<vtkProbeFilter>::New();
>   sampleVolume->SetInputConnection(1, imageReader->GetOutputPort());
> #if VTK_MAJOR_VERSION <= 5
>   sampleVolume->SetInput(0, surface);
>  #else
>   sampleVolume->SetInputData(0, surface);
> #endif
>   // Compute a simple window/level based on scalar range
>   vtkSmartPointer<vtkWindowLevelLookupTable> wlLut =
>     vtkSmartPointer<vtkWindowLevelLookupTable>::New();
>   double range = imageReader->GetOutput()->GetScalarRange()[1] -
>                  imageReader->GetOutput()->GetScalarRange()[0];
>   double level = (imageReader->GetOutput()->GetScalarRange()[1] +
>                   imageReader->GetOutput()->GetScalarRange()[0]) / 2.0;
>   wlLut->SetWindow(range);
>   wlLut->SetLevel(level);
>   sampleVolume->Update();
>
>
>   // Extract the polydata
>    vtkSmartPointer<vtkPolyData> polydata =
> vtkSmartPointer<vtkPolyData> :: New();
>    polydata = vtkPolyData::SafeDownCast(sampleVolume->GetOutput());
>
>   // Get the number of points in the polydata
>   vtkIdType idNumPointsInFile = polydata->GetNumberOfPoints();
>
>   vtkSmartPointer<vtkDoubleArray> array = vtkSmartPointer<vtkDoubleArray>
> :: New();
>    array =
> vtkDoubleArray::SafeDownCast(polydata->GetPointData()->GetArray("Distances"));
>   if(array)
>     {
>     for(int i = 0; i < idNumPointsInFile; i++)
>       {
>       std::cout << "Got array." << std::endl;
>       double dist;
>       dist = array->GetValue(i);
>       /*
>       //if the array held arrays instead of scalars, you would use this:
>       double location[3];
>       array->GetTupleValue(i, location);
>       std::cout << "Location: " << Location[0] << ","  << Location[1] <<
> "," << Location[2] << std::endl;
>       */
>       std::cout << "Distance: " << dist << std::endl;
>       }
>     }//end if(array)
>   else
>     {
>     std::cout << "no array." << std::endl;
>     }
>
>   system("PAUSE");
>
>   return EXIT_SUCCESS;
>
>
>
> On Thu, Jul 18, 2013 at 9:53 PM, rahul indoria <rahulindoria5 at gmail.com>wrote:
>
>> I am trying to get the point data of each point of this example
>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/CurvedReformation
>>
>>
>> so that`s why i am trying to use the point data access example (
>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/GetMiscPointData)
>>
>>
>>
>> Looking forward your reply soon.
>>
>>
>>
>> On Thu, Jul 18, 2013 at 9:48 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:
>>
>>> The file seems fine. The example read it, but it does not contain any
>>> point data. This example is meant to show you how to access poiont data if
>>> it exists.
>>>
>>> What is your goal?
>>>
>>>
>>>
>>> On Thu, Jul 18, 2013 at 3:45 PM, rahul indoria <rahulindoria5 at gmail.com>wrote:
>>>
>>>> Hi Bill,
>>>>           I am also using .vtp file. i am attaching a file with this
>>>> mail, if this is wrong, could you please suggest me some other file, as i
>>>> am new on vtk, so i am not very much familiar with it.
>>>>
>>>> Looking forward your reply soon.
>>>>
>>>>
>>>> On Thu, Jul 18, 2013 at 9:40 PM, Bill Lorensen <bill.lorensen at gmail.com
>>>> > wrote:
>>>>
>>>>> It requires an input xml polydata file, a .vtp file.
>>>>>
>>>>> The file should contain point data.
>>>>>
>>>>>
>>>>>
>>>>> On Thu, Jul 18, 2013 at 3:25 PM, rahul indoria <
>>>>> rahulindoria5 at gmail.com> wrote:
>>>>>
>>>>>>  Hi,
>>>>>>     could you please check this example, what should be the arguments
>>>>>> for this examples.
>>>>>>
>>>>>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/GetMiscPointData
>>>>>>
>>>>>> Can you tell me the arguments of this example.
>>>>>>
>>>>>>
>>>>>> Looking forward your reply soon.
>>>>>>
>>>>>> Rahul
>>>>>>
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>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Unpaid intern in BillsBasement at noware dot com
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> *Best  Regards
>>>> Rahul Indoria
>>>> Mobile No: +49-157-35652212*
>>>>
>>>
>>>
>>>
>>> --
>>> Unpaid intern in BillsBasement at noware dot com
>>>
>>
>>
>>
>> --
>> *Best  Regards
>> Rahul Indoria
>> Mobile No: +49-157-35652212*
>>
>
>
>
> --
> *Best  Regards
> Rahul Indoria
> Mobile No: +49-157-35652212*
>



-- 
Unpaid intern in BillsBasement at noware dot com
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