[vtkusers] Re: Re: Strange Artefacts with Surface Rendering

[Tobias Mönch]

Hi Goodwin,

I applied BackfaceCulling to the corresponding vtkActor but it did not help.
How should the vtkTriangleFilter be applied?
At the moment I'm using this simple pipeline (which I found in an example):

vtkContourFilter-->vtkDecimatePro-->vtkSmoothPolyDataFilter

-->vtkPolyDataNormals-->vtkPolyDataMapper-->vtkActor



Where should I put the vtkTriangleFilter?

Thanks for your help.
Tobias


----- Original Message -----
From: "Goodwin Lawlor" <goodwin.lawlor at ucd.ie>
To: <vtkusers at public.kitware.com>
Sent: Thursday, September 22, 2005 1:12 PM
Subject: [vtkusers] Re: Strange Artefacts with Surface Rendering


Tobias Mönch wrote:
> Hi vtk'ers!
>
> I've again some problems. I'm doing a simple SurfaceRendering of a brain
using a
> vtkPolyDataMapper (and some smoothing before). When I use no transparency
then
> everything is fine.
> But if I set the opacity of the surface-actor to some value below 1.0 the
> following happens:
> The surface seems to turn its inside out when I rotate it in some
direction
> (sometimes it looks like this). It also seems that some parts of the
surface
> disappear when rotating (as it was clipped). It's no problem to rotate the
> brain-surface back and then everything is completely closed as it should.
But in
> some special positions the described things happen.
>
> Does anyone had the same problems or an idea what the problem could be?
>
> I attached a screenshot where i marked where the surface already
disappeared.
>

Hi Tobias,

Do you get the same artefacts with BackfaceCullingOn and rendering
triangles only (using vtkTriangleFilter)?

Goodwin

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