[vtkusers] Save a vtkContourTriangulator output inside a PNG

[Romain LEGUAY]

Hello everyone,

In purpose to create a series of pictures (with the same size 512*512 for
example), I cut a mesh along an axis (X, Y or Z) with vtkCutter, then I
triangulate those contours with vtkContourTriangulator. I obtain some
"flat" vtkPolydata*s* (one per cut). Now, I want to save all those "flat"
meshes to 2D images with fixed size.
I saw on the wiki (
http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/PolyDataToImageData) how
to convert a vtkPolydata in vtkImageData, but in this case, my vtkPolydata
is in a plane (the output of vtkContourTriangulator) so the dimension of
the white image is 0 or negative because of this part of code:

vtkSmartPointer<vtkImageData> whiteImage =
vtkSmartPointer<vtkImageData>::New();
double bounds[6];
polydata->GetBounds(bounds);
double spacing[3]; // desired volume spacing
spacing[0] = 0.5;
spacing[1] = 0.5;
spacing[2] = 0.5;
whiteImage->SetSpacing(spacing);

// compute dimensions
int dim[3];
for (int i = 0; i < 3; i++)
{
  dim[i] = static_cast<int>(ceil((bounds[i * 2 + 1] - bounds[i * 2]) /
spacing[i])); // One of the dimension is 0
}
whiteImage->SetDimensions(dim);
whiteImage->SetExtent(0, dim[0] - 1, 0, dim[1] - 1, 0, dim[2] - 1); // Here


I don't know if there is other choice to convert a polydata to an image but
this code always give some black pictures.
I'm not sure if I use the good filter to convert my polydata to a 2D image
but I don't find anything.

Do you have any clues?

Thanks,

Romain
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