[vtkusers] Multiple Render Windows

[Lisa Avila]

Hello Markus,

Since you include the same mapper in two different render windows, you need 
to use immediate mode rendering (ImmediateModeRenderingOn on the mapper). 
Display lists are built for a particular OpenGL context and you are trying 
to use it in two different ones....

Lisa


At 01:15 PM 2/24/2004, Christopher.Moore at noaa.gov wrote:

>Hi Markus,
>
>It's nice that you included the simple (complete) sample code with your
>email.  I was able to quickly compile it on my machine (VTK 4.2, Redhat
>9.0, Nvidia driver/Quadro 550) and it doesn't show the problem you are
>having.  The Sphere remains visible as the Cone actors happily spin around
>in both windows.
>
>Are you using Mesa or hardware-accelerated OpenGL?  Seems the only
>difference between our systems is RH version, and opengl...
>
>Best of luck,
>Chris Moore - NOAA Seattle
>
>On Tue, 24 Feb 2004 duke123 at gmx.net wrote:
>
> > Dear VTKers,
> >
> > I am a new VTK user (VTK 4.2, Redhat 7.2) and am currently experiencing a
> > strange problem. I am using a Sensable Phantom device, along with VTK for
> > haptic and graphic rendering. I have some medical volume data with 
> segmented
> > bones, represented as vtkVolume and a vtkActor for each segment (as 
> polygonal
> > mesh).
> >
> > In my application I want to use 2 render windows, one displaying a volume
> > rendering of the volume, and the other one displaying the segmented bones,
> > which are touchable by the phantom. The current phantom position is 
> shown by a
> > cursor (vtkActor).
> >
> > Since volume rendering takes some time, the "volume window" needs only be
> > re-rendered when the camera position has changed, whereas the "main window"
> > shall be redrawn as fast as possible, since it contains the phantom 
> cursor.
> >
> > The problem I have, is that some actors which are present in the "main
> > window" disappear, as soon as the "volume window" is rendered. This 
> problem can be
> > solved by adding all actors to both windows. But I don't want to do that.
> >
> > I have put together a simple example highlighting my problem (sources 
> at the
> > end of this mail). In this example, there are two cones and one sphere and
> > two render windows. The first window contains only  one cone, whereas the
> > other window contains a cone and the sphere. When both windows are 
> rendered for
> > the first time, all actors are drawn. If the windows are rendered 
> again, the
> > sphere disappears. If the cone is removed from the second window, so 
> that this
> > window only contains the sphere, the sphere is rendered.
> >
> > I have checked how many actors are rendered ( GetNumberOfPropsRendered() )
> > and two actors are reported, although only one is visible.
> >
> > I hope that this problem is because I made a stupid mistake, since I am new
> > to VTK.
> > Anyways, thanks for your help.
> >
> >
> > Markus
> >
> >
> > Here is the example C++ code.
> >
> >
> > #include "vtkSphereSource.h"
> > #include "vtkConeSource.h"
> > #include "vtkPolyDataMapper.h"
> > #include "vtkActor.h"
> > #include "vtkRenderer.h"
> > #include "vtkRenderWindow.h"
> > #include "vtkCamera.h"
> > #include "vtkRenderWindowInteractor.h"
> > #include "vtkProperty.h"
> >
> >
> > void main( int argc, char *argv[] )
> > {
> >
> >   vtkConeSource *cone = vtkConeSource::New();
> >   cone->SetHeight( 3.0 );
> >   cone->SetRadius( 1.0 );
> >   cone->SetResolution( 10 );
> >
> >
> >
> >   vtkSphereSource *sphere = vtkSphereSource::New();
> >   sphere->SetRadius(5.0);
> >   sphere->SetThetaResolution(20);
> >   sphere->SetPhiResolution(20);
> >   sphere->SetCenter(-10,0,5);
> >
> >   vtkPolyDataMapper *coneMapper = vtkPolyDataMapper::New();
> >   coneMapper->SetInput( cone->GetOutput() );
> >
> >   vtkPolyDataMapper *sphereMapper = vtkPolyDataMapper::New();
> >   sphereMapper->SetInput( sphere->GetOutput() );
> >
> >
> >
> >   vtkActor *coneActor = vtkActor::New();
> >   coneActor->SetMapper(coneMapper);
> >   coneActor->GetProperty()->SetColor(0, 0, 1);
> >   coneActor->GetProperty()->SetInterpolationToPhong();
> >
> >   vtkActor *sphereActor = vtkActor::New();
> >   sphereActor->SetMapper( sphereMapper );
> >   sphereActor->SetOrigin(0,0,0);
> >
> >   vtkRenderWindow *renWin = vtkRenderWindow::New();
> >   vtkRenderWindow *renWin2 = vtkRenderWindow::New();
> >
> >   vtkRenderer *ren1= vtkRenderer::New();
> >   ren1->AddActor(coneActor );
> >   ren1->SetBackground( 1,1,1 );
> >
> >   vtkRenderer *ren2= vtkRenderer::New();
> >
> >    // if the following line is uncommented, it works
> >   ren2->AddActor(coneActor);
> >   ren2->AddActor(sphereActor);
> >   ren2->SetBackground( 1,1,1 );
> >
> >
> >   renWin->AddRenderer( ren1 );
> >   renWin2->AddRenderer( ren2 );
> >
> >   renWin->SetSize( 400, 300 );
> >   renWin2->SetSize( 400, 300 );
> >   renWin2->SetPosition(0,350);
> >
> >
> >   // Loop over 360 degrees and render both windows each time.
> >
> >   for (int i = 0; (i % 360) < 360; i++) {
> >
> >     renWin->Render();
> >     renWin2->Render();
> >     coneActor->SetOrientation(i,0,0);
> >   }
> >
> > }
> >
> >
> >
> > --
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