Off screen rendering problem

Support
1

Hi Friends,

I’m using off screen rendering to make “shots” of a VTK scene.

I have a Main Renderer containing actors, and a List of actors “ActorsToShoot” to shoot.
The technic I’m using is quit simple (C# pseudo code) :

var OffScreenWindow = new RenderWindow();
var OffScreenRenderer = new Renderer();
OffScreenWindow.SetOffScreenRendering(true);
OffScreenWindow.SetMultiSamples(8);
OffScreenWindow.AddRenderer(OffScreenRenderer);
OffScreenWindow.SetSize(2000, 2000);

///Props
ActorsToShoot.ForEach(a => OffScreenRenderer.AddViewProp(a));
OffScreenRenderer.ResetCameraScreenSpace();
OffScreenRenderer.ResetCameraClippingRange();
try
{
	///Shoot
	return OffScreenWindow.ShootToPNG(); ///helper method that uses vtkWindowToImageFilter + vtkPNGWriter
}
finally
{
	OffScreenWindow.Dispose(); ///calls ren->SetRenderWindow(nullptr);
	OffScreenRenderer.Dispose(); ///calls this->RemoveAllViewProps();
}

Works great but :
After the shoot, the “ActorsToShoot” actors disappear from the main Renderer.
To make same reappear, I have to move the camera somehow (Pan, Rotate, …).
ResetCamera() / ResetCameraClippingRange() is not enough to make actors reappear.

Any idea ?
Tks !