[vtkusers] SSAA and FXAA

[Allie Vacanti]

I'm not sure what's causing this, enabling FXAA should work out of the box
for all data rendered in the opaque/translucent passes. Have you tried with
the default options? They shouldn't need to be tweaked unless you're having
serious performance / quality issues.

For SSAA, I'm curious why you're setting the maximum number of peels to 0?
That effectively disables peeling and would result in the improper blending
that you're seeing.

HTH,
-Allie

On Tue, Mar 5, 2019 at 3:43 PM chung <chung at navatekltd.com> wrote:

> Hi experts,
>
> I'm using vtk 8.1 and am having a little bit of a trouble getting
> anti-aliasing working.
>
> When using the FXAA approach, the graphic remains the same regardless of
> the
> FXAA options I pass to the renderer.
>
> vtkSmartPointer<vtkRenderer> renderer =
> vtkSmartPointer<vtkOpenGLRenderer>::New();
> renderer->SetUseFXAA ( true );
> auto options = renderer->GetFXAAOptions();
> options->SetSubpixelBlendLimit ( 0.75 );
> options->SetHardContrastThreshold ( 0.045 );
> options->SetRelativeContrastThreshold ( 0.125 );
> options->SetEndpointSearchIterations ( 12 );
> options->SetSubpixelContrastThreshold ( 0.25 );
> options->SetUseHighQualityEndpoints ( true );
>
> <http://vtk.1045678.n5.nabble.com/file/t342714/fxaa.png>
>
>
> When using the SSAA render pass approach I have depth buffer issue where
> the
> surfaces of a primitive cube get rendered in an incorrect order. I came
> across this depth peeling fix but it didn't work for me unfortunately.
>
>
> http://vtk.1045678.n5.nabble.com/vtk-developers-QVTKOpenGLWidget-SSAA-pass-breaks-depth-peeling-td5746428.html
>
>
> vtkSmartPointer<vtkRenderer> renderer =
> vtkSmartPointer<vtkOpenGLRenderer>::New();
> renderer->SetBackground ( 0.615f, 0.639f, 0.666f );
>
> vtkNew<vtkRenderStepsPass> basicPasses;
> vtkNew<vtkSSAAPass> ssaa;
>
> vtkSmartPointer<vtkDepthPeelingPass> depthPeel = vtkSmartPointer <
>         vtkDepthPeelingPass > ::New();
> vtkSmartPointer<vtkTranslucentPass> translucent = vtkSmartPointer <
>         vtkTranslucentPass > ::New();
> depthPeel->SetMaximumNumberOfPeels ( 0 );
> depthPeel->SetTranslucentPass ( translucent );
> basicPasses->SetTranslucentPass ( depthPeel );
>
>
> ssaa->SetDelegatePass ( basicPasses );
> renderer->SetPass ( ssaa );
> renderer->SetUseDepthPeeling ( true );
> renderer->SetMaximumNumberOfPeels ( 0 );
>
> <http://vtk.1045678.n5.nabble.com/file/t342714/ssaa.png>
>
>
> I'm not sure what I'm missing and I would greatly appreciate if anyone can
> help me spot it.
>
> Thanks,
> Chuan
>
>
>
>
> --
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