[vtkusers] Artifacts in rendering PolyData with opacity < 1

[David Pont]

I think what you want is vtkDepthSortPolyData. I pipe my polydata through 
vtkPolyDataNormals, vtkDepthSortPolyData and then on to a vtkPolyDataMapper 
and it works very nicely.
Small problem is I forget where I got it from, it does not seem to be part 
of the distribution?.
I would recommend getting it from the source, so search the list archive, or 
maybe someone else can remember where it comes from?. Otherwise I can send 
what I have to you.

  regards
    Dave Pont

>From: "Alejandro F. Frangi" <afrangi at doc.ic.ac.uk>
>Reply-To: alex at isi.uu.nl
>To: vtkusers at public.kitware.com
>Subject: [vtkusers] Artifacts in rendering PolyData with opacity < 1
>Date: Mon, 20 Nov 2000 09:53:39 +0100
>
>Hi all,
>
>  I'm rendering a vtkPolyData set and after i map it with a
>PolyDataMapper I want to select give the surface (actor) a given
>opacity. Now, if the opacity is unitary there are noproblems. As soon as
>I use a smaller opcaity I get funny rendering artifacts when interacting
>with the object. Does anybody know the reason of this and how can be
>solved? I tried by recomputing the normals before rendering but this
>does not make any difference.
>
>   newNormals = vtkPolyDataNormals::New();
>   newNormals->SetInput(surface);
>   newNormals->SplittingOff();
>   newNormals->SetConsistency(1);
>   newNormals->SetComputePointNormals(1);
>   newNormals->FlipNormalsOff();
>   newNormals->Update();
>
>  Any hint of how to solve this?
>
>
>  Thanks,
>		Alex
>
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