[vtkusers] Re: [Paraview-developers] [LONG] Antialiasing with multisampling method

[Berk Geveci]

I don't think this is a good enough solution. The tests may pass but
all users will get anti-aliasing when running paraview interactively.
Compositing does not work propery when anti-aliasing is on. Also, it
will slow down rendering. We should disable anti-aliasing when we
create the render window in paraview.

On 9/22/05, David C. Thompson <dcthomp at sandia.gov> wrote:
> > Here is my question. There are a couple of ways to make the regression tests
> > not to fail because of multisampling.
> >
> > 1. Remove multisampling query: we will never get a multisample context, but
> > users may like to have antialiasing anyway.
> > 2. Once we get a multisample context, call glDisable(GL_MULTISAMPLE) and never
> > use multisampling. We potentially get a context with a special buffer that
> > allocate some video memory for nothing, when this memory could be useful to
> > load a lot of textures.
> > 3. Set default value of GlobalMaximumNumberOfMultiSamples to 0 instead of 8.
> > 4. Set default value of MultiSamples to 0 instead of
> >    GlobalMaximumNumberOfMultiSamples.
> > 5. On each potentially failing test, call SetMultiSamples(0) at the beginning,
> > which requires access to the concrete type of RenderWindow.
> > ... Solution 5 looks easy for VTK tests, less easy for ParaView tests.
> >
> > Any opinion about thoses solution, or some alternate solution is welcome.
>
> Couldn't vtkTesting::RegressionTest() call SetMultiSamples(0) if
> necessary before rendering? For ParaView, couldn't the same thing be
> accomplished inside GUI/Testing/Tcl/Compare.tcl? I supposed that if a
> test required MultiSamples turned on, it would have to explicitly
> request it of vtkTesting or Compare, but I suspect this would be many
> fewer tests than the other way around.
>
>         David
>
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