[vtkusers] Information of vtkActor, points and coordinates

[David Doria]

On Wed, Feb 23, 2011 at 8:10 AM, ederhazael <ederhazael at hotmail.com> wrote:
>
> I have a problem, I am trying to get the "number of points" and the "number
> of cells" with this code:
>
> int points=Actor->GetMapper()->GetInput()->GetNumberOfPoints();
> int cells=Actor->GetMapper()->GetInput()->GetNumberOfCells();
>
> but in both cases, I get a 0. I think that I need "Build Cells" and "Build
> Links" as in the mesh, but the code is diferent because I use this code in
> the mesh;
>
> "Mesh"->GetOutput()->BuildCells();
>
> But in the vtkActor it not work, because it not have the opcion.
>
> What do you think?
>
> Thanks

The following outputs

4
4

for me.

#include <vtkPolyData.h>
#include <vtkPoints.h>
#include <vtkSmartPointer.h>
#include <vtkActor.h>
#include <vtkPolyDataMapper.h>

int main(int argc, char *argv[])
{
  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  points->InsertNextPoint(0,0,0);
  points->InsertNextPoint(0,1,0);
  points->InsertNextPoint(1,0,0);
  points->InsertNextPoint(1.5,1,0);

  vtkSmartPointer<vtkPolyData> polydata =
    vtkSmartPointer<vtkPolyData>::New();
  polydata->SetPoints(points);

  std::cout << polydata->GetNumberOfPoints() << std::endl;

  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInput(polydata);

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  std::cout << actor->GetMapper()->GetInput()->GetNumberOfPoints() << std::endl;

  return EXIT_SUCCESS;
}

David