[vtkusers] vtkVolumeTextureMapper3D and offscreen rendering

[Mark Wyszomierski]

HI Lisa,
 I looked up what I had posted:
  http://public.kitware.com/pipermail/vtkusers/2005-August/081366.html
 you're right, it had nothing to do with the window to image filter, but
something with
capturing an offscreen rendering context for a print operation. It was so
long ago,
maybe this is more related to what you're trying to do though anyways Jesse,

 Mark

 On 10/19/05, Lisa Avila <lisa.avila at kitware.com> wrote:
>
> Mark,
>
> vtkWindowToImageFilter is not offscreen rendering so this is not the same
> problem unless the render window you were using was offscreen. I am not sure
> why you should have a problem with vtkWindowToImageFilter - you may need to
> change whether you read from the front or back buffer depending on your
> exact rendering parameters (and perhaps even your graphics driver) but it
> should work....
>
> Lisa
>
>
> At 02:15 PM 10/18/2005, Mark Wyszomierski wrote:
>
> I believe I ran into the a similar problem before, I wanted to
> save what was currently being rendered to screen to an
> image file using vtkWindowToimageFilter. This did not work
> with the 3d texture volume mapper, but it did for the rest of the
> volume renderers. I had to write some code to extract the pixel data
> left in the screen buffer, and this worked ok. Sorry I can't be
> more specific, this was about 2 months ago, but I posted a
> better explanation of what I did to the mailing list at that point,
> it should still be in the archives. Hopefully this can give you
> some ideas if the general problems are the same,
>
> Mark
>
>
> On 10/18/05, *Lisa Avila* <lisa.avila at kitware.com > wrote:
>
> Hi Jesse,
>
> The offscreen context probably does not support the extension necessary to
> do the 3D texture mapping (this is typical). I am not sure if there is a
> way around it - hopefully drivers will support it in the future.
>
> Lisa
>
>
>
> At 04:29 PM 10/11/2005, Jesse Corrington wrote:
> >I just switched to using 3d texture mapping for volumes, and now i am
> >unable to do offscreen rendering, but the onscreen works very well. Is it
> >possible to have offscreen rendering using 3d texture mapping.
> >
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