[vtkusers] set image as background

[Giancarlo Amati]

I agree totally :)
that's what I was about to do :)

GC.

> From: david.gobbi at gmail.com
> Date: Thu, 11 Feb 2010 09:40:08 -0700
> Subject: Re: [vtkusers] set image as background
> To: ilferraresebono at hotmail.it
> CC: daviddoria+vtk at gmail.com; vtkusers at vtk.org
> 
> Hi Giancarlo,
> 
> Get out your pencil & paper and draw diagrams.  Do a google image
> search on "view frustum" to see the kind of diagrams that I mean
> (though I always just draw them in 2D and use a trapezoid to represent
> the frustum).
> 
> Also, even though VTK does a pretty good job of automatically setting
> the camera parameters, it's a good exercise to set up the camera and
> clipping range yourself every so often to remind yourself of how
> everything works.  I even do so myself fairly often, because sometimes
> I forget how all this stuff fits together.  By properly setting up the
> camera, you can get the image to the size that you want.
> 
>   David
> 
> On Thu, Feb 11, 2010 at 9:37 AM, Giancarlo Amati
> <ilferraresebono at hotmail.it> wrote:
> > Thanks guys that's roughly what I wanted to get to.
> > althought he image should fill in the window viewport. :) instead of staying
> > right there
> >
> > Many thanks!!!
> >
> >> From: david.gobbi at gmail.com
> >> Date: Thu, 11 Feb 2010 09:24:39 -0700
> >> Subject: Re: [vtkusers] set image as background
> >> To: ilferraresebono at hotmail.it
> >> CC: daviddoria+vtk at gmail.com; vtkusers at vtk.org
> >>
> >> 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
> >
> > ________________________________
> > Troppe caselle di posta? Gestiscile da Hotmail!
 		 	   		  
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