[vtkusers] Point array with 3 components, only has 0 tuples but there are 4 points

[Bill Lorensen]

Tracy,

You should be using:
        colorArray->InsertTuple3(0,0,0,0);
        colorArray->InsertTuple3(1,0,0,0);
        colorArray->InsertTuple3(2,0,0,0);
        colorArray->InsertTuple3(3,0,0,0);

InsertNextTuple3 will add to the already allocated colorArray.

This does not explain the error message you get however.

Bill
On Dec 28, 2007 8:28 PM, Tracy Hu <tracy.hu at yahoo.com> wrote:

> Hello,
>
> I'm trying to write a image filter, but I got this error:
>
> ERROR: In \vwdev\PC\Libraries\vtk44\src\Common\vtkDataSet.cxx, line 376
> vtkImageData (02476728): Point array color array with 3 components, only
> has 0
>  tuples but there are 4 points
>
> do you have any idea?
>
> Below are my code:
>
> //------------main.cpp-------------------
> #include "vtkRenderer.h"
> #include "vtkRenderWindow.h"
> #include "vtkRenderWindowInteractor.h"
> #include "vtkInteractorStyleTrackballCamera.h"
> #include "vtkPoints.h"
> #include "vtkDataSetMapper.h"
> #include "vtkImageData.h"
> #include "vtkPointData.h"
> #include "CImageMerger.h"
>
> int main( int argc, char *argv[] )
> {
>     CImageMerger *reader = CImageMerger::New();
>         reader->Update();
>     cout <<"main: # of tuples in color array: " <<
> reader->GetOutput()->GetPointData()->GetArray(0)->GetNumberOfTuples()
> <<endl;
>
>     vtkDataSetMapper *mapper = vtkDataSetMapper::New();
>         mapper->SetInput(reader->GetOutput());
>
>     vtkActor *actor = vtkActor::New();
>         actor->SetMapper(mapper);
>
>     vtkRenderer* ren = vtkRenderer::New();
>         ren->AddActor(actor);
>         ren->SetBackground(1, 1, 1);
>
>     vtkRenderWindow* renWin = vtkRenderWindow::New();
>         renWin->AddRenderer(ren);
>
>     vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
>         iren->SetRenderWindow(renWin);
>     vtkInteractorStyleTrackballCamera *style =
> vtkInteractorStyleTrackballCamera::New();
>         iren->SetInteractorStyle(style);
>     renWin->SetSize(600,600);
>     renWin->Render();
>     iren->Start();
>
>     style->Delete();
>     iren->Delete();
>     ren->Delete();
>     renWin->Delete();
>     actor->Delete();
>     mapper->Delete();
>     reader->Delete();
>     return 0;
>
> }
>
>
> //-------------CImageMerger.cpp--------------
> #include "vtkFloatArray.h"
> #include "vtkPointData.h"
> #include "vtkObjectFactory.h"
> #include <vector>
> #include "vtkUnsignedCharArray.h"
> #include "vtkImageData.h"
> #include "CImageMerger.h"
>
> vtkCxxRevisionMacro(CImageMerger, "$Revision: 1.30 $");
> vtkStandardNewMacro(CImageMerger);
>
> CImageMerger::CImageMerger():vtkImageSource()
> {}
> CImageMerger::~CImageMerger()
> {}
>
> void CImageMerger::ExecuteData(vtkDataObject*)
> {
>     this->GetOutput()->SetDimensions(2, 2, 1);
>     this->GetOutput()->SetSpacing(1.0,1.0,1.0);
>     this->GetOutput()->SetOrigin(0.0,0.0,0.0);
>     this->GetOutput()->SetScalarType(VTK_UNSIGNED_CHAR);
>     vtkUnsignedCharArray *colorArray = vtkUnsignedCharArray::New();
>         colorArray->SetNumberOfComponents(3);
>         colorArray->SetNumberOfTuples(4);
>         colorArray->InsertNextTuple3(0,0,0);
>         colorArray->InsertNextTuple3(0,0,0);
>         colorArray->InsertNextTuple3(0,0,0);
>         colorArray->InsertNextTuple3(0,0,0);
>     colorArray->SetName("color array");
>     this->GetOutput()->GetPointData()->SetScalars(colorArray);
> }
>
> void CImageMerger::ExecuteInformation()
> {
> }
>
> void CImageMerger::PrintSelf(ostream& os, vtkIndent indent)
> {
> }
>
> //--------CImageMerger.h-------------------
> #include "vtkImageSource.h"
>
> class CImageMerger : public vtkImageSource
> {
> public:
>     vtkTypeRevisionMacro(CImageMerger, vtkImageSource);
>     void PrintSelf(ostream& os, vtkIndent indent);
>     static CImageMerger *New();
>
>     CImageMerger();
>     ~CImageMerger();
>
> protected:
>     void ExecuteInformation();
>     void ExecuteData(vtkDataObject*);
>
> private:
>     CImageMerger(const CImageMerger&);  // Not implemented.
>     void operator=(const CImageMerger&);  // Not implemented.
>
>
> };
>
>
> thanks
>
> tracy
>
>
>
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