[vtkusers] Showing a Line

[Luca Pallozzi Lavorante]

Bob, you must link the line´s mapper to its Actor:

vtkActor *lineASourceActor = vtkActor::New();
    lineASourceActor->SetMapper(lineAMapper); // ADD THIS LINE
    lineASourceActor->GetProperty()->SetColor(0.0, 0.0, 1.0);

Greetings

    Luca

On 5/23/06, Bob Palank <bob at stlcc.org> wrote:
>
> Given the code below, I see the cylinder, but not the line.
> Any idea why ? Shouldn't a line be a visible object like a cylinder?
> If not, then does one display a line object using a cylinder with a small
> diameter ?
> Hopefully there is a simple coding error!
> TIA
>   Bob
>
> Code follows:
> #include "vtkCylinderSource.h"
> #include "vtkPolyDataMapper.h"
> #include "vtkActor.h"
> #include "vtkRenderer.h"
> #include "vtkRenderWindow.h"
> #include "vtkRenderWindowInteractor.h"
> #include "vtkProperty.h"
> #include "vtkCamera.h"
> #include "vtkLineSource.h"
>
> int main(int argc, char *argv[])
> {
>   vtkCylinderSource *cylinder = vtkCylinderSource::New();
>   cylinder->SetResolution(18);    // eight circumferential facets.
>
>
>   vtkPolyDataMapper *cylinderMapper = vtkPolyDataMapper::New();
>   cylinderMapper->SetInput(cylinder->GetOutput());
>
>
>   vtkActor *cylinderActor = vtkActor::New();
>   cylinderActor->SetMapper(cylinderMapper);
>   cylinderActor->GetProperty()->SetColor(1.0000, 0.3882, 0.2784);
>   cylinderActor->RotateX(30.0);
>   cylinderActor->RotateY(-45.0);
>
>   // =================================================================
>   vtkLineSource *lineASource = vtkLineSource::New();
>   lineASource->SetPoint1(-12.0,2.0,2.0);
>   lineASource->SetPoint2(12.0,4.0,5.0);
>
>   vtkPolyDataMapper *lineAMapper = vtkPolyDataMapper::New();
>   lineAMapper->SetInput(lineASource->GetOutput());
>
>   vtkActor *lineASourceActor = vtkActor::New();
>   lineASourceActor->GetProperty()->SetColor(0.0, 0.0, 1.0);
>
>
>
>
>   vtkRenderer *ren1 = vtkRenderer::New();
>   vtkRenderWindow *renWin = vtkRenderWindow::New();
>   renWin->AddRenderer(ren1);
>   vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
>   iren->SetRenderWindow(renWin);
>
>
>   ren1->AddActor(cylinderActor);
>   ren1->AddActor(lineASourceActor);
>   ren1->SetBackground(0.1, 0.2, 0.4);
>   renWin->SetSize(300, 300);
>
>   // We'll zoom in a little by accessing the camera and invoking a "Zoom"
>   // method on it.
>   // ren1->GetActiveCamera()->Zoom(1.5);
>   renWin->Render();
>
>   // This starts the event loop and as a side effect causes an initial
> render.
>   iren->Start();
>
>   // Exiting from here, we have to delete all the instances that
>   // have been created.
>   cylinder->Delete();
>   cylinderMapper->Delete();
>   cylinderActor->Delete();
>   lineASourceActor->Delete();
>   lineAMapper->Delete();
>   ren1->Delete();
>   renWin->Delete();
>   iren->Delete();
>
>   return 0;
> }
>
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