[vtkusers] ... An strange rendering?

[Amy Squillacote]

Sorry, I forgot to include that part. vtkPolyDataNormals 
(http://www.vtk.org/doc/nightly/html/classvtkPolyDataNormals.html)will 
change the orientation of all the normals in your vtkPolyData data set.

- Amy

nugg wrote:
> Hi Amy,
>
> Amy Squillacote-3 wrote:> > We saw something similar last week when rendering an OBJ. Have you > verified that the normals in your OBJ model are pointing outward? In our > case, we saw this strange behavior because the normals were pointing > inward instead. (Using a vtkGlyph3D filter with a vtkArrowSource as the > glyph source will show this visually.)> > I didnt test it. In case that you are right, how could I change the> normals> to be pointing outward?> > A lot of thanks.> > - Amy> > jsl n wrote:>> Hi friends,>>>>   I've just the following problem when rendering a .OBJ mesh. The first>> attached>> screenshot is obtained with the following setup for the VTK's camera:>>>> camera->SetFocalPoint(0, 0, 0);>> camera->SetPosition(0, 0, 5.1);>> camera->ComputeViewPlaneNormal();>> camera->SetViewUp(0, 1, 0);>> camera->SetViewAngle(22.2);>>>> It looks right...>>>> The point is that changing the SetPosition() method as following:>>>> camera->SetFocalPoint(0, 0, 0);>> camera->SetPosition(0, 0, -5.1);  // Here is the only change.>> camera->ComputeViewPlaneNormal();>> camera->SetViewUp(0, 1, 0);>> camera->SetViewAngle(22.2);>>>> rendering becomes messed up (backfaces and bad z-fighting), as depicted>> in the>> second attached screenshot. Why placing the camera position in the>> Z-negative>> gets wrong results?>>>> I'd be so grateful with you for any advice.>> _________________________________________________________________>> ¿Eres un cotilla? Disfruta de todas las novedades en MSN Corazón>> http://entretenimiento.es.msn.com/corazon/>>>> ------------------------------------------------------------------------>>>>>> ------------------------------------------------------------------------>>>> ------------------------------------------------------------------------>>>> _______________________________________________>> This is the private VTK discussion list.>> Please keep messages on-topic. Check the FAQ at:>> http://www.vtk.org/Wiki/VTK_FAQ>> Follow this link to subscribe/unsubscribe:>> http://www.vtk.org/mailman/listinfo/vtkusers>>   > > -- > Amy Squillacote                    Phone: (256) 726-4839> Computer Scientist                 Fax: (256) 726-4806> CFD Research Corporation           Web: http://www.cfdrc.com> 215 Wynn Drive, Suite 501> Huntsville, AL  35805> > > _______________________________________________> This is the private VTK discussion list.> Please keep messages on-topic. Check the FAQ at:> http://www.vtk.org/Wiki/VTK_FAQ> Follow this link to subscribe/unsubscribe:> http://www.vtk.org/mailman/listinfo/vtkusers> > 
> -- View this message in context: http://www.nabble.com/...-An-strange-rendering--tp20166362p20193630.htmlSent from the VTK - Users mailing list archive at Nabble.com.
> _______________________________________________This is the private VTK discussion list.Please keep messages on-topic. Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQFollow this link to subscribe/unsubscribe:http://www.vtk.org/mailman/listinfo/vtkusers
>
>
>   

-- 
Amy Squillacote                    Phone: (256) 726-4839
Computer Scientist                 Fax: (256) 726-4806
CFD Research Corporation           Web: http://www.cfdrc.com
215 Wynn Drive, Suite 501
Huntsville, AL  35805