[vtkusers] No vectors in input data after ShallowCopy

[Werner Sembach]

Ok it makes even less sense to me now:

For testingpupose i have changed:
void MainWindow::updateImage(vtkSmartPointer<vtkImageData> newImage) {
     image->ShallowCopy(newImage);
     image->Modified();

     qvtkWidget->GetRenderWindow()->Render();
}
too
void MainWindow::updateImage(vtkSmartPointer<vtkImageData> newImage) {
     image->ShallowCopy(newImage);
     initializeImage2()

     qvtkWidget->GetRenderWindow()->Render();
}
where inizializeImage2 prints a different picture than the first 
inizialization.

And this works, but when i do this:

void MainWindow::updateImage(vtkSmartPointer<vtkImageData> newImage) {
     image = newImage;
     initializeImage2()

     qvtkWidget->GetRenderWindow()->Render();
}

nothing in the output changes at all.

this doesn't make sense to me anymore. What am i missing guys? pls help

void MainWindow::initializeImage2()
{
     unsigned int dim = 20;

     image->SetDimensions(dim, dim, 1);
     image->SetSpacing(1.0, 1.0, 1.0);
     image->SetOrigin(0.0, 0.0, 0.0);

     image->AllocateScalars(VTK_DOUBLE,3);

     for(unsigned int x = 0; x < dim; x++)
     {
         for(unsigned int y = 0; y < dim; y++)
         {
             double* pixel = 
static_cast<double*>(image->GetScalarPointer(x,y,0));
             pixel[0] = 1.0;
             pixel[1] = 1.0;
             pixel[2] = 0.0;
         }
     }
image->GetPointData()->SetVectors(image->GetPointData()->GetArray(0));
     //image->GetPointData()->SetActiveVectors("ImageScalars");
     image->Modified();
}

Am 28.10.2015 um 16:03 schrieb Werner Sembach:
> So i have a function that gehts a vtkImageData*
> and should replace another, already displayed, vtkImageData*
>
> void MainWindow::updateImage(vtkSmartPointer<vtkImageData> newImage) {
>     image->ShallowCopy(newImage);
>     image->Modified();
>
>     qvtkWidget->GetRenderWindow()->Render();
> }
>
> however when i try to run this i get the error "vtkHedgeHog 
> (0xa3fc80): No vectors in input data"
>
> if i use a standart assignment (image = newImage) the display doesn't 
> change at all
>
>
>
> initial image is created here (image is a instance variable):
>
> void MainWindow::initializeImage()
> {
>     unsigned int dim = 20;
>
>     image->SetDimensions(dim, dim, 1);
>     image->SetSpacing(1.0, 1.0, 1.0);
>     image->SetOrigin(0.0, 0.0, 0.0);
>
>     image->AllocateScalars(VTK_DOUBLE,3);
>
>     for(unsigned int x = 0; x < dim; x++)
>     {
>         for(unsigned int y = 0; y < dim; y++)
>         {
>             double* pixel = 
> static_cast<double*>(image->GetScalarPointer(x,y,0));
>             pixel[0] = -1;
>             pixel[1] = 1;
>             pixel[2] = 0.0;
>         }
>     }
>     image->GetPointData()->SetActiveVectors("ImageScalars");
>     image->Modified();
> }
>
> the new image is generated here:
>
> void MainWindow::on_actionTest_Update_triggered()
> {
>     vtkSmartPointer<vtkImageData> newImage = 
> vtkSmartPointer<vtkImageData>::New();
>     unsigned int dim = 30;
>
>     newImage->SetDimensions(dim, dim, 1);
>     newImage->SetSpacing(1.0, 1.0, 1.0);
>     newImage->SetOrigin(0.0, 0.0, 0.0);
>
>     newImage->AllocateScalars(VTK_DOUBLE,3);
>
>     for(unsigned int x = 0; x < dim; x++)
>     {
>         for(unsigned int y = 0; y < dim; y++)
>         {
>             double* pixel = 
> static_cast<double*>(newImage->GetScalarPointer(x,y,0));
>             pixel[0] = 1;
>             pixel[1] = 0.0;
>             pixel[2] = 0.0;
>         }
>     }
> newImage->GetPointData()->SetActiveVectors("imageScalars");
>     newImage->Modified();
>     updateImage(newImage);
> }
>
>
>
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