[vtkusers] Only flat shading with VRML data

[Mika Fischer]

If I leave out the normals filter, I get flat shading *and* broken textures.

So:
vtkPolyDataMapper: flat shading, good texture
vtkPolyDataNormals -> vtkPolyDataMapper: flat shading, good texture
vtkCleanPolyData -> vtkPolyDataMapper: flat shading, broken texture
vtkCleanPolyData -> vtkPolyDataNormals -> vtkPolyDataMapper: smooth
shading, broken texture

Best,
 Mika

On Fri, Jul 6, 2012 at 3:50 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> 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
>> >
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