[vtkusers] Create "ovoid" with VTK

[mar x]

Ok I solved the problem by clipping the half of a sphere with vtkPlane and
the half of an ellipsoid. Thanks!


2013/7/9 Bill Lorensen <bill.lorensen at gmail.com>

> You could use
> http://vtk.org/Wiki/VTK/Examples/Cxx/PolyData/BooleanOperationPolyDataFilterto create a union of a sphere and ellipsoid. This image might help:
> http://commons.wikimedia.org/wiki/File:Ovoid_plot.gif
>
>
>
> On Tue, Jul 9, 2013 at 5:35 PM, mar x <myint101 at gmail.com> wrote:
>
>> Thanks for the fast answers. I tried both but both gives just an
>> ellipsoid and no ovoid. In other words I want to create a 3D object that is
>> a composition of a half sphere and and half ellipsoid.
>>
>> Best regards.
>>
>>
>> 2013/7/9 Bill Lorensen <bill.lorensen at gmail.com>
>>
>>> Or try:
>>> // .NAME vtkParametricEllipsoid - Generate an ellipsoid.
>>> // .SECTION Description
>>> // vtkParametricEllipsoid generates an ellipsoid.
>>> // If all the radii are the same, we have a sphere.
>>> // An oblate spheroid occurs if RadiusX = RadiusY > RadiusZ.
>>> // Here the Z-axis forms the symmetry axis. To a first
>>> // approximation, this is the shape of the earth.
>>> // A prolate spheroid occurs if RadiusX = RadiusY < RadiusZ.
>>>
>>>
>>>
>>> On Tue, Jul 9, 2013 at 5:11 PM, Shawn Waldon <swaldon at cs.unc.edu> wrote:
>>>
>>>> You probably want something more like:
>>>>
>>>> vtkSphereSource *sSource= vtkSphereSource::New();
>>>>    sSource->SetThetaResolution( 12);
>>>>    sSource->SetPhiResolution (  12);
>>>>    sSource->SetCenter( 0, 0, 0 );
>>>>    sSource->SetRadius( 10.0 );
>>>>
>>>>  vtkTransform* transform = vtkTransform::New();
>>>>      transform->Identity();
>>>>    transform->Scale(3,1,1);
>>>>    transform->Update();
>>>> vtkTransformPolyDataFilter* tFilter = vtkTransformPolyDataFilter::New();
>>>> tFilter->SetInputConnection(sSource.GetOutputPort());
>>>> tFilter->SetTransform(transform);
>>>> tFilter->Update()
>>>>
>>>> vtkPolyDataMapper *map = vtkPolyDataMapper::New();
>>>> map->SetInputConnection(tFilter->GetOutputPort());
>>>>
>>>> .................
>>>>
>>>> I didn't change your example much due to laziness and wanting to
>>>> copy/paste, but you really should use vtkSmartPointers.
>>>>
>>>>
>>>>
>>>> On Tue, Jul 9, 2013 at 5:06 PM, mar x <myint101 at gmail.com> wrote:
>>>>
>>>>> Dear VTK list,
>>>>>
>>>>> I want to create a 3D object that looks like an egg/ovoid. I tried to
>>>>> to this with vtkSphere and by setting the vtkTransform->Scale to something
>>>>> like 3,1,1 but it's not working. I would be very glad if you could help me
>>>>> on this. Please find below the code and thank you for any help!
>>>>>
>>>>>
>>>>> vtkSphereSource *sSource= vtkSphereSource::New();
>>>>>    sSource->SetThetaResolution( 12);
>>>>>    sSource->SetPhiResolution (  12);
>>>>>    sSource->SetCenter( 0, 0, 0 );
>>>>>    sSource->SetRadius( 10.0 );
>>>>>
>>>>> vtkTransform* transform = vtkTransform::New();
>>>>>      transform->Identity();
>>>>>    transform->Scale(3,1,1);
>>>>>    transform->Update();
>>>>>    vtkSphere* sphere = vtkSphere::New();
>>>>>    sphere->SetCenter(0,0,0);
>>>>>   sphere->SetTransform(transform);
>>>>>
>>>>>      vtkSmartPointer<vtkClipPolyData> clipper =
>>>>> vtkSmartPointer<vtkClipPolyData>::New();
>>>>>     clipper->SetInputConnection(sSource->GetOutputPort());
>>>>>     clipper->SetClipFunction(sphere);
>>>>>     clipper->SetValue(0);
>>>>>     clipper->Update();
>>>>>
>>>>>   vtkPolyDataMapper *map = vtkPolyDataMapper::New();
>>>>>   map->SetInput(clipper->GetOutput());
>>>>>
>>>>>   vtkActor *aSphere = vtkActor::New();
>>>>>   aSphere->SetMapper(map);
>>>>>    aSphere->GetProperty()->SetColor(0,0,1);
>>>>> ......
>>>>> .....
>>>>> .....
>>>>>
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>>>>>
>>>>
>>>>
>>>> --
>>>> Shawn Waldon
>>>> Graduate Student
>>>> Department of Computer Science
>>>> University of North Carolina at Chapel Hill
>>>> swaldon at cs.unc.edu
>>>>
>>>> _______________________________________________
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>>>>
>>>
>>>
>>> --
>>> Unpaid intern in BillsBasement at noware dot com
>>>
>>
>>
>
>
> --
> Unpaid intern in BillsBasement at noware dot com
>
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