[vtkusers] Polydata sometimes just shown after moving mousewheel

[David Doria]

On Tue, Apr 16, 2013 at 7:34 AM, Marc Huber <marchuber.hft at gmx.de> wrote:
> Hi,
>
> i have the problem, that if i load polydata to a renderer window depending
> on the dataset sometimes the object is shown directly and sometimes i have
> to move the mousewheel one time and then the object gets visible.
> For each object my camera is set depending on the center point of my
> polydata.
> I do a repaint but it doesn't help me.
>
> Has anyone an idea what the problem might be?
> Or can someone just tell me how i perform a simple event zooming in or out
> one time?
>
> My Code:
>     double cent[3], bounds[6], lenX, lenY, lenZ, max;
>     stlActor->GetMapper()->GetCenter(cent);
>     stlActor->GetMapper()->GetBounds(bounds);
>     lenX=bounds[1]-bounds[0];
>     lenY=bounds[3]-bounds[2];
>     lenZ=bounds[5]-bounds[4];
>     max=lenX;
>     if (lenY > max) {max=lenY;}
>     if (lenZ > max) {max=lenZ;}
>
>     cam->SetFocalPoint(cent[0],cent[1],cent[2]);
>     cam->SetViewUp(0,0,1);
>     cam->SetPosition(-2*max,0,0);
>     if (direction==0)  //azimuth
>     {
>         cam->Azimuth(degree);
>     }
>     else if (direction==1) //elevation
>     {
>         cam->Elevation(degree);
>     }
>     renderer->SetActiveCamera(cam);
>     ui.qvtkWidget->repaint();


Did you try renderer->ResetCamera()? Otherwise, please post compilable
code that demonstrates the problem. The code should be as simple as
possible (remove the Qt dependency, hard code data to view, etc.)

David