[vtkusers] Only flat shading with VRML data

[Bill Lorensen]

Leave out the normals filter. Let's see you is messing with the texture
coordinates.

On Fri, Jul 6, 2012 at 9:38 AM, Mika Fischer <mika.fischer at zoopnet.de>wrote:

> Unfortnuately, that yields exactly the same results...
>
> On Fri, Jul 6, 2012 at 3:33 PM, Bill Lorensen <bill.lorensen at gmail.com>
> wrote:
> > on the normals filter try
> > ->SplittingOff();
> >
> > On Fri, Jul 6, 2012 at 9:22 AM, Mika Fischer <mika.fischer at zoopnet.de>
> > wrote:
> >>
> >> Ok, unfortunately now I get a problem when mapping the texture on the
> >> surface. There are strage "seams" in some places:
> >> http://zoopnet.de/vrml2.png
> >>
> >> Without vtkCleanPolyData the texture mapping worked fine. I think the
> >> problem might be caused by the vertices of the polygons being changed
> >> by vtkCleanPolyData. Is there something I can do to transform the
> >> texture in the same way?
> >>
> >> The code used for texturing is below.
> >>
> >> Thanks a lot in advance!
> >>
> >> Best,
> >>  Mika
> >>
> >> ------------------------------------------------------------
> >> vtkSmartPointer<vtkBMPReader> bmpReader =
> >> vtkSmartPointer<vtkBMPReader>::New();
> >> bmpReader->SetFileName(fileBmp.c_str());
> >> bmpReader->Update();
> >>
> >> vtkImageData* image = bmpReader->GetOutput();
> >> vtkTexture *texture = vtkTexture::New();
> >> texture->SetInputConnection(bmpReader->GetOutputPort());
> >> texture->InterpolateOn();
> >>
> >> [...]
> >>
> >> solidActor->SetTexture(texture);
> >>
> >>
> >> On Fri, Jul 6, 2012 at 3:06 PM, Mika Fischer <mika.fischer at zoopnet.de>
> >> wrote:
> >> > Yes, that fixed it! Thanks a lot!
> >> >
> >> > Best,
> >> >  Mika
> >> >
> >> > On Fri, Jul 6, 2012 at 3:01 PM, Bill Lorensen <
> bill.lorensen at gmail.com>
> >> > wrote:
> >> >> Try running vtkCleanPolyData before the normals calculation. The data
> >> >> may
> >> >> duplicate the points for each triangle. clean polydata will remove
> >> >> duplicate
> >> >> points.
> >> >>
> >> >> On Fri, Jul 6, 2012 at 5:21 AM, Mika Fischer <
> mika.fischer at zoopnet.de>
> >> >> wrote:
> >> >>>
> >> >>> Hi,
> >> >>>
> >> >>> first of all I have to say that is the first time that I use vtk
> and I
> >> >>> don't have much experience with 3D graphics.
> >> >>>
> >> >>> I have a 3d triangle mesh of a face in wrl format. I also managed to
> >> >>> display it. However the shading of the triangles seems to be flat.
> >> >>> Calling SetInterpolationToGouraud() or SetInterpolationToFlat()
> seems
> >> >>> to make no difference.
> >> >>>
> >> >>> The code used to load the data and display it is below. Am I missing
> >> >>> an important step here?
> >> >>>
> >> >>> Also, if I load the file in ParaView, it has the same issue and
> >> >>> switching from Flat to Gouraud makes no visible difference. However
> if
> >> >>> I use a CylinderSource, the shading is smooth as I would expect it
> >> >>> (and switching to flat makes a huge difference).
> >> >>>
> >> >>> Here's a screenshot of the data in paraview:
> >> >>> http://zoopnet.de/vrml.png
> >> >>>
> >> >>> Any tips would be very much appreciated!
> >> >>>
> >> >>> Best,
> >> >>>  Mika
> >> >>>
> >> >>> -------------------------------------
> >> >>> vtkSmartPointer<vtkVRMLImporter> importer =
> >> >>> vtkSmartPointer<vtkVRMLImporter>::New();
> >> >>> importer->SetFileName(fileWrl.c_str());
> >> >>> importer->Read();
> >> >>> importer->Update();
> >> >>>
> >> >>> vtkActorCollection* actors = importer->GetRenderer()->GetActors();
> >> >>> actors->InitTraversal();
> >> >>> vtkDataSet* pDataset =
> >> >>> actors->GetNextActor()->GetMapper()->GetInput();
> >> >>>
> >> >>> vtkPolyData* polyData = vtkPolyData::SafeDownCast(pDataset);
> >> >>> polyData->Update();
> >> >>>
> >> >>> vtkSmartPointer<vtkPolyDataNormals> skinNormals =
> >> >>> vtkSmartPointer<vtkPolyDataNormals>::New();
> >> >>> skinNormals->SetFeatureAngle(90.0);
> >> >>> skinNormals->SetInput(polyData);
> >> >>> skinNormals->Update();
> >> >>>
> >> >>> vtkSmartPointer<vtkPolyDataMapper> solidMapper =
> >> >>> vtkSmartPointer<vtkPolyDataMapper>::New();
> >> >>> solidMapper->SetInputConnection(skinNormals->GetOutputPort());
> >> >>> solidMapper->ScalarVisibilityOff();
> >> >>>
> >> >>> vtkSmartPointer<vtkActor> solidActor =
> >> >>> vtkSmartPointer<vtkActor>::New();
> >> >>> solidActor->SetMapper(solidMapper);
> >> >>> solidActor->GetProperty()->SetInterpolationToGouraud();
> >> >>>
> >> >>> -------------------------------------
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> >> >>
> >> >>
> >> >>
> >> >> --
> >> >> Unpaid intern in BillsBasement at noware dot com
> >> >>
> >
> >
> >
> >
> > --
> > Unpaid intern in BillsBasement at noware dot com
> >
>



-- 
Unpaid intern in BillsBasement at noware dot com
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