[vtk-developers] Failing test rendering problem

[Mathieu Westphal]

Yes, I supose it would remove overlapping problem as well. an option would
be nice.

Well my initial fix is working great. I will wait a bit to see if anyone is
disturbed by the vtkTesting::FrontFrame deprecation before merging.

Mathieu Westphal

On Fri, Jul 3, 2015 at 3:10 PM, David Thompson <david.thompson at kitware.com>
wrote:

> Hi Mathieu,
>
> > Also, another track could be investigated, the use of
> vtkRenderWindow::SetOffScreenRendering remove the need of any Front/Bak
> buffer fiddling, the image being always accessible. ...
> > But we may encounter some problem with the offscreen rendering,
> (antialiasing? multisampling? i don't know much about it ).
>
> I think you are correct in anticipating trouble. At least on some old
> platforms (and probably some newer ones, too) offscreen rendering is
> handled differently by the driver and often as software-only rendering.
> That would slow down many tests as well as make their results different
> from what users would see (making them not really test what we want).
>
> However, I know a lot of developers want to be able to run image tests in
> the background without windows popping up. So I am all for adding it as an
> option dependent on some environment variable or command-line argument
> being set. It should not be the default, though.
>
>         David
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