[vtkusers] VTK newbie: please help_vtkOBJReader & vtkBandedPolyDataContourFilter problem

[PsyVis]

Hello

I'm using the BandedContour Filter in java, I've used exactly the same
procedure as you ( 
        bcf = new vtkBandedPolyDataContourFilter();
        bcf.SetInput(part.GetOutput()); // comes from the reader
        bcf.GenerateValues(50, part.GetOutput().GetScalarRange());
        bcf.SetScalarModeToValue();
        
        bcf.GenerateContourEdgesOn();

        vtkPolyDataMapper edgeMapper = new vtkPolyDataMapper();
        edgeMapper.SetInput(bcf.GetContourEdgesOutput());
) 

, but the only thing I didn't do was the:

 bcf3.Update();

Try getting rid of that update line and see if it works

Rich



shajay wrote:
> 
> Hello all,
> 
> I was trying to generate banded contours on an imported mesh(.OBJ).
> (albeit without much success)
> 
> 	vtkOBJReader *reader1=vtkOBJReader::New();
> 	reader1->SetFileName(VTK_DATA_ROOT "test.obj");
> 	reader1->UpdateWholeExtent();
> 
> 	vtkBandedPolyDataContourFilter  *bcf3 =
> vtkBandedPolyDataContourFilter::New();
> 	bcf3->SetInputConnection(reader1->GetOutputPort());
>         bcf3->Update();
> 	bcf3->GenerateValues(5, reader1->GetOutput()->GetScalarRange());
> 	bcf3->SetScalarModeToIndex();
> 	bcf3->GenerateContourEdgesOn();
> 
> .........etc.
> this produces the following no input data error:
> ERROR: In ..\..\vtk-5.2.0\Graphics\vtkBandedPolyDataContourFilter.cxx,
> line 233
> vtkBandedPolyDataContourFilter (04D6AF38): No input data!
> 
> The error is the same if a replace the OBJreader with an STLreader.
> I also tried  parse the files myself constructing a vtkPolyData object and
> use
> obj->setPoints ()
> obj->setPolys().
> 
> the error is still the same.
> 
> Does the vtkBandedContourFilter require a very specific kind of polygon
> information?
> 
> Thanks in advance,
> 
> Any help will be much appreciated.
> 
> shajay.
> 

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