[vtkusers] problem about user defined subclass of vtkCamera

[Yanbing Hu]

I wonder if anybody could give me any hint? I try to make a subclass of
vtkCamera (say tmpCamera), but by using tmpCamera, no actor shows up.
but if I just replace "tmpCamera *camera = new tmpCamera;" with
"vtkCamera *camera = vtkCamera::New();" , the actor shows up. Here is
the code:
 
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkPolyDataMapper.h"
#include "vtkActor.h"
#include "vtkProperty.h"
#include "vtkCamera.h"
#include "vtkInteractorStyleTrackballCamera.h"
#include "vtkCubeSource.h"
 

class tmpCamera :public vtkCamera{};
 
int main_rotate_about_picked_point( int argc, char *argv[] )
{
 vtkCubeSource *cube = vtkCubeSource::New();
 vtkPolyDataMapper* mapper = vtkPolyDataMapper::New();
  mapper->SetInput(cube->GetOutput());
  mapper->ScalarVisibilityOff();
 
 vtkActor* actor = vtkActor::New();
  actor->SetMapper(mapper);
  actor->SetPosition(0.0,0.0,-3.0);
  actor->GetProperty()->SetColor(0.0,1.0,0.0);
 
vtkInteractorStyleTrackballCamera *style =
vtkInteractorStyleTrackballCamera::New();
 
 vtkRenderer *ren = vtkRenderer::New();
 tmpCamera* camera = new tmpCamera();
    ren->SetActiveCamera(camera);
    ren->AddActor(actor);
 
vtkRenderWindow *renwin = vtkRenderWindow::New();
  renwin->AddRenderer(ren);
  
 vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renwin);
  iren->SetInteractorStyle(style);
 
 renwin->SetSize(600,600);
 renwin->Render();
 iren->Initialize();
 iren->Start();
 
 return 0;
}
 
What did I do wrong? thanks a lot
 
Yanbing

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