[vtkusers] PolyData rendering problem

[Aashish Chaudhary]

Can you try this experiment:

Keep the setting to performance but just turn on the Antialiasing if it is
possible to change that setting individually? There you will find options
as well. Try different options and let us know if you see the difference?

It could be either: z buffer precison issue or antialiasing issue if there
is nothing special about your dataset.

Also, can you send us this dataset?

- Aashish



On Tue, Nov 12, 2013 at 11:57 PM, Frank Gao <Frank.Gao at guidemia.com> wrote:

> Hi David,
>
>
>
> I did a comparison between the nVidia card settings, and found out the
> differences with “Performance” and “Quality” preference. Please see the
> document below.
>
>
>
>
> https://www.dropbox.com/s/vwdgj44zz6y3w6w/nVIdiaCard_Setting_difference.docx
>
>
>
> I am assuming there are some OpenGL calls to implement the difference, but
> don’t really know what to do. Hope this can provide some clues.
>
> Best regards,
>
> Frank
>
>
>
> *From:* vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] *On
> Behalf Of *David E DeMarle
> *Sent:* Tuesday, November 12, 2013 4:43 PM
> *To:* Frank.Gao at guidemia.com
> *Cc:* VTK Developers; VTK Users
> *Subject:* Re: [vtkusers] PolyData rendering problem
>
>
>
> What is the world space size of the triangles? Are they small enough to
> push the limits of GL float precision?
>
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
>
>
> On Tue, Nov 12, 2013 at 6:10 PM, Frank Gao <Frank.Gao at guidemia.com> wrote:
>
>
>
> Hi All,
>
>
>
> We are having some problems with the surface rendering in VTK. If the
> users don’t set their graphics card preference to “Quality”, the surface
> rendering will show a lot of “ghost” lines between the triangles, but they
> are not the polydata edges. Completely display artifact. When the triangles
> are small, this is much more obvious. I places a picture in the following
> link. The left one has problem. The right one is when preference is set to
> “quality”.
>
>
>
> https://www.dropbox.com/s/1kvpzia57uggist/vtk_polydata_rendering_case.PNG
>
>
>
> Because of this we have to tell the users to change their graphics card
> setting. Is this something we can do in the code? Thanks a lot in advance.
>
>
>
> Regards,
>
> Frank Gao
>
>
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-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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