[vtkusers] Picking and dragging a vertex - points not moving to appropriate position
Vashist Purbhoo
vashist14 at hotmail.com
Fri Jun 17 11:35:33 EDT 2011
Hi Dominik! Thank you for your reply. I tried what you suggested and included the update just before I get the release position of the mouse. It seems to be the most logical place to do so to me. However, there is still no change in the output.
I was thinking maybe the problem lies with the coordinates returned themselves. Does anyone have any previous experience with this? Vashist > Date: Fri, 17 Jun 2011 14:14:25 +0200
> From: dominik at itis.ethz.ch
> To: vashist14 at yahoo.com
> CC: vtkusers at vtk.org
> Subject: Re: [vtkusers] Picking and dragging a vertex - points not moving to appropriate position
>
> Sounds very much like you miss dataset->Modified() somewhere.
>
> Dominik
>
> On Fri, Jun 17, 2011 at 10:41 AM, Vashist Purbhoo <vashist14 at hotmail.com> wrote:
> > Hi vtkusers!
> >
> > I am trying to deform a 3D object by clicking and dragging its vertices. I
> > was able to adapt the "SelectAVertex.cxx" example
> > (http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/MoveAVertex) on the
> > vtk website to make it work with a polydata I create using vtkSphereSource.
> > To summarise, to deform the object I select a vertex by clicking on the
> > middle mouse button and drag the point to the new location I want. I render
> > the vertices of my object using
> > vtkVertexGlyphFilter as well as the surface of the object.
> >
> > The program works correctly if I select the points without changing the
> > initial view of the rendered object. However, once I change the view, for
> > example to access a point at the back of my object, the point no longer
> > moves to where I drag it. The coordinates returned do not correspond to the
> > position where i release the mouse button. I would highly appreciate if any
> > help/suggestions could be provided on how to solve this.
> >
> > Thank you.
> >
> > Vashist
> >
> >
> > #include <vtkSmartPointer.h>
> > #include <vtkPointPicker.h>
> > #include <vtkRendererCollection.h>
> > #include <vtkProperty.h>
> > #include <vtkObjectFactory.h>
> > #include <vtkPolyDataMapper.h>
> > #include <vtkActor.h>
> > #include <vtkRenderWindow.h>
> > #include <vtkRenderer.h>
> > #include <vtkRenderWindowInteractor.h>
> > #include <vtkPolyData.h>
> > #include <vtkPointSource.h>
> > #include <vtkInteractorStyleJoystickActor.h>
> > #include <vtkAreaPicker.h>
> > #include <vtkVertexGlyphFilter.h>
> > #include <vtkIdFilter.h>
> > #include <vtkAssembly.h>
> > #include <vtkSphereSource.h>
> > #include <vtkExtractGeometry.h>
> > #include <vtkDataSetMapper.h>
> > #include <vtkUnstructuredGrid.h>
> > #include <vtkGlyph3D.h>
> > #include <vtkPointData.h>
> > #include <vtkIdTypeArray.h>
> > #include <vtkDataSetSurfaceFilter.h>
> > #include <vtkPlanes.h>
> >
> > class InteractorStyle : public vtkInteractorStyleJoystickActor
> > {
> > public:
> > static InteractorStyle* New();
> > vtkTypeMacro(InteractorStyle,vtkInteractorStyleJoystickActor);
> >
> > InteractorStyle()
> > {
> > this->Move = false;
> > this->PointPicker = vtkSmartPointer<vtkPointPicker>::New();
> >
> > // Setup ghost glyph
> > vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
> > points->InsertNextPoint(0,0,0);
> > this->MovePolyData = vtkSmartPointer<vtkPolyData>::New();
> > this->MovePolyData->SetPoints(points);
> > this->MoveGlyphFilter = vtkSmartPointer<vtkVertexGlyphFilter>::New();
> >
> > this->MoveGlyphFilter->SetInputConnection(this->MovePolyData->GetProducerPort());
> > this->MoveGlyphFilter->Update();
> >
> > this->MoveMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
> >
> > this->MoveMapper->SetInputConnection(this->MoveGlyphFilter->GetOutputPort());
> >
> > this->MoveActor = vtkSmartPointer<vtkActor>::New();
> > this->MoveActor->SetMapper(this->MoveMapper);
> > this->MoveActor->VisibilityOff();
> > this->MoveActor->GetProperty()->SetPointSize(5);
> > this->MoveActor->GetProperty()->SetColor(1,0,0);
> > }
> > //_____________________________________________________________________________________
> > void OnMouseMove()
> > {
> > if(!this->Move)
> > {
> > return;
> > }
> > vtkInteractorStyleJoystickActor::OnMouseMove();
> > }
> > //_____________________________________________________________________________________
> > void OnMiddleButtonUp()
> > {
> > this->EndPan();
> >
> > this->Move = false;
> > this->MoveActor->VisibilityOff();
> > this->Data->GetPoints()->SetPoint(this->SelectedPoint,
> > this->MoveActor->GetPosition());
> > this->Data->Modified();
> > this->GetCurrentRenderer()->Render();
> > this->GetCurrentRenderer()->GetRenderWindow()->Render();
> >
> > }
> > //_____________________________________________________________________________________
> > void OnMiddleButtonDown()
> > {
> > // Get the selected point
> > int x = this->Interactor->GetEventPosition()[0];
> > int y = this->Interactor->GetEventPosition()[1];
> > this->FindPokedRenderer(x, y);
> >
> > this->PointPicker->Pick(this->Interactor->GetEventPosition()[0],
> > this->Interactor->GetEventPosition()[1],
> > 0, // always zero.
> >
> > this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());
> > if(this->PointPicker->GetPointId() >= 0)
> > {
> > this->StartPan();
> > this->MoveActor->VisibilityOn();
> > this->Move = true;
> > this->SelectedPoint = this->PointPicker->GetPointId();
> >
> > std::cout << "Dragging point " << this->SelectedPoint << std::endl;
> >
> > double p[3];
> > this->Data->GetPoint(this->SelectedPoint, p);
> > std::cout << "p: " << p[0] << " " << p[1] << " " << p[2] <<
> > std::endl;
> > this->MoveActor->SetPosition(p);
> >
> > this->GetCurrentRenderer()->AddActor(this->MoveActor);
> > this->InteractionProp = this->MoveActor;
> > }
> > }
> > //_____________________________________________________________________________________
> > vtkPolyData* Data;
> > vtkPolyData* GlyphData;
> >
> > vtkSmartPointer<vtkPolyDataMapper> MoveMapper;
> > vtkSmartPointer<vtkActor> MoveActor;
> > vtkSmartPointer<vtkPolyData> MovePolyData;
> > vtkSmartPointer<vtkVertexGlyphFilter> MoveGlyphFilter;
> > vtkSmartPointer<vtkPointPicker> PointPicker;
> > bool Move;
> > vtkIdType SelectedPoint;
> > };
> > //_____________________________________________________________________________________
> > vtkStandardNewMacro(InteractorStyle);
> > //_____________________________________________________________________________________
> >
> > int main (int, char *[])
> > {
> > // Create a sphere (object to be deformed)
> > vtkSmartPointer<vtkSphereSource> sphereSource =
> > vtkSmartPointer<vtkSphereSource>::New();
> > sphereSource->SetCenter(20.0, 20.0, 20.0);
> > sphereSource->SetRadius(20.0);
> > sphereSource->SetThetaResolution(10);
> > sphereSource->SetPhiResolution(10);
> > sphereSource->Update();
> >
> > //Create polydata from sphereSource
> > vtkSmartPointer<vtkPolyData> points_poly =
> > vtkSmartPointer<vtkPolyData>::New();
> > points_poly->CopyStructure(sphereSource->GetOutput());
> >
> > vtkSmartPointer<vtkVertexGlyphFilter> glyphFilter
> > = vtkSmartPointer<vtkVertexGlyphFilter>::New();
> > glyphFilter->SetInputConnection(points_poly->GetProducerPort());
> > glyphFilter->Update();
> > // Create a mapper and actor
> > vtkSmartPointer<vtkPolyDataMapper> points_mapper =
> > vtkSmartPointer<vtkPolyDataMapper>::New();
> > points_mapper->SetInputConnection(glyphFilter->GetOutputPort());
> >
> > vtkSmartPointer<vtkActor> points_actor = vtkSmartPointer<vtkActor>::New();
> > points_actor->SetMapper(points_mapper);
> > points_actor->GetProperty()->SetPointSize(10);
> > vtkSmartPointer<vtkPolyDataMapper> Mapper2 =
> > vtkSmartPointer<vtkPolyDataMapper>::New();
> > Mapper2->SetInput(points_poly);
> >
> > vtkSmartPointer<vtkActor> Actor2 = vtkSmartPointer<vtkActor>::New();
> > Actor2->SetMapper(Mapper2);
> >
> > //assembly to synchronise interaction of points & polydata
> > vtkSmartPointer<vtkAssembly> assembly
> > = vtkSmartPointer<vtkAssembly>::New();
> > assembly->AddPart(points_actor);
> > assembly->AddPart(Actor2);
> > // Visualize
> > vtkSmartPointer<vtkRenderer> renderer =
> > vtkSmartPointer<vtkRenderer>::New();
> > vtkSmartPointer<vtkRenderWindow> renderWindow =
> > vtkSmartPointer<vtkRenderWindow>::New();
> > renderWindow->AddRenderer(renderer);
> >
> > vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
> > vtkSmartPointer<vtkRenderWindowInteractor>::New();
> > renderWindowInteractor->SetRenderWindow(renderWindow);
> >
> > renderer->AddActor(assembly);
> >
> > renderWindow->Render();
> >
> > vtkSmartPointer<InteractorStyle> style =
> > vtkSmartPointer<InteractorStyle>::New();
> > renderWindowInteractor->SetInteractorStyle( style );
> > style->Data = points_poly;
> >
> > renderWindowInteractor->Start();
> > return EXIT_SUCCESS;
> > }
> >
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>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>
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