[vtkusers] set image as background

[David Gobbi]

I don't think that it is enough to just set up the layers, because by
default the Renderer will always erase everything and set the
background color.

Try renderer->EraseOff() on all but the rear-most renderer.

Note that EraseOff will also keep the depth buffer from being cleared
between renders, so you will have to manually set the camera position
and camera clipping planes in your background renderer so that the
image is just barely in front of the rear clipping plane.

  David


On Thu, Feb 11, 2010 at 9:20 AM, Giancarlo Amati
<ilferraresebono at hotmail.it> wrote:
> Yup, it's roughly the same structure my code has.
> But apparently whatever is the order or the AddRenderer..... the one
> containing the image seems prevailing over the other one
>
> Many thanks anyway!
>
>
> ________________________________
> Date: Thu, 11 Feb 2010 11:08:50 -0500
> From: daviddoria+vtk at gmail.com
> CC: vtkusers at vtk.org
> Subject: Re: [vtkusers] set image as background
>
> On Thu, Feb 11, 2010 at 10:54 AM, Giancarlo Amati
> <ilferraresebono at hotmail.it> wrote:
>
> mmm now it get confusing because that's the style of my code:
>
> this is the declaration:
>     vtkSmartPointer<vtkRenderer> L0= vtkSmartPointer<vtkRenderer>::New();
>     vtkSmartPointer<vtkCamera> camL0 = vtkCamera::New();
>
>
>     vtkSmartPointer<vtkRenderer> L1 = vtkSmartPointer<vtkRenderer>::New();
>     vtkSmartPointer<vtkCamera> camL1 = vtkCamera::New();
>
>
>     vtkSmartPointer<vtkRenderWindow> renderWindow =
> vtkSmartPointer<vtkRenderWindow>::New();
>     renderWindow->SetSize(720,576);
>
>
> Than I create a plane with texture the image I load up and then... I add the
> plane to L1;
> L0->AddActor(Scene);
> L1->AddActor(texturedPlane);
>
> renderWindow->AddRenderer(L0);
> renderWindow->AddRenderer(L1);
>
> and I call start() of the interactor.
>
> but I just got my Texture rendered..but not the 3D Model. so what u mean
> with Layers?
>
> Regards.
> Giancarlo
>
> I tried to make a demo of this:
> http://www.vtk.org/Wiki/VTK/Examples/BackgroundImage
> However, it seems like one renderer covers up the other. For now it is just
> trying to display an ImageActor in backgroundRenderer and then a sphere in
> sceneRenderer.
> Thanks,
>
> David