[vtkusers] SSAA and FXAA

[chung]

Yes I do see a noticeable difference in the FXAAFilter test as well as in my
own test widget.

<http://vtk.1045678.n5.nabble.com/file/t342714/vtkFXAA.png> 


<http://vtk.1045678.n5.nabble.com/file/t342714/myFXAA.png> 
<http://vtk.1045678.n5.nabble.com/file/t342714/myFXAA2.png> 
I can see that the FXAA algorithm is affecting the grid lines at certain
angles but they aren't as smooth as I'd like them to be.


I stepped through the code and the grid was rendered in the opaque pass as
vtkRenderer::UpdateOpaquePolygonalGeometry returns 1.


Thanks again Allie for looking into this.

Sincerely,
Chuan



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