[vtkusers] Deleting cells

[Miguel Angel Rodriguez Florido]

	http://www.bioengineering-research.com/vtk/vtkRemoveCellsFilter.htm

	Thanks to G.L.
	HtH.


Ricardo Seco VTK wrote:
> Hello!
> 
> I have a cloud of points and i need to delete some of the points. Anyone
> has any ideas how to do this? Thanks in advance.
> Here's the code...
> 
> Ricardo Seco
> 
> // Editor 3D para manipulação de nuvem de pontos e modelos triangulados
> 
> #include "stdio.h"
> 
> #include "vtkActor.h"
> #include "vtkRenderWindow.h"
> #include "vtkRenderer.h"
> #include "vtkRenderWindowInteractor.h"
> 
> #include "vtkProperty.h"
> #include "vtkPointPicker.h"
> #include "vtkCellPicker.h"
> #include "vtkOpenGLActor.h"
> #include "vtkCommand.h"
> #include "vtkSphereSource.h"
> #include "vtkPoints.h"
> #include "vtkPointData.h"
> #include "vtkPolyData.h"
> #include "vtkCellArray.h"
> #include "vtkPolyDataMapper.h"
> 
> /* IMPLEMENTAÇÂO DO OBSERVER PARA O CELL PICKER */
> 
> class vtkMyCallback : public vtkCommand
> {
> public:
>        vtkMyCallback::vtkMyCallback() { m_pvtkActorSelection = NULL; };
>        static vtkMyCallback *New() { return new vtkMyCallback; }
>        void SetSelectionActor(vtkActor* pvtkActorSelection) {
> m_pvtkActorSelection = pvtkActorSelection; };
>        virtual void Execute(vtkObject *caller, unsigned long, void*)
>        {
>                vtkRenderWindowInteractor *iren =
> reinterpret_cast<vtkRenderWindowInteractor*>(caller);
>                double coords[3];
>                vtkCellPicker *picker = (vtkCellPicker *)iren->GetPicker();
>                //picker->GetPCoords(coords);
>                //printf("Coords: x:%f y:%f z:%f \n
> ",coords[0],coords[1],coords[2] );
>                printf("Cell ID: %d \n",picker->GetCellId());
>                if (picker->GetCellId() != -1)
>                {
>                        if (m_pvtkActorSelection)
>                             
> m_pvtkActorSelection->SetPosition(picker->GetPickPosition());
>                        iren->Render();
>                }
>        }
> private:
>        vtkActor* m_pvtkActorSelection;
> };
>      
> int main()
> {
>    // Inicializações
>    int numPoints;
>    FILE *fp;
>    float fltData1,fltData2,fltData3;
>    char str[100];
>    vtkPoints *Points = vtkPoints::New();
>    vtkCellArray  *Vertices = vtkCellArray::New();
>    vtkPolyData *dataSet = vtkPolyData::New();
>    numPoints = 0;
>          // Leitura dos dados do ficheiro
>    if ((fp = fopen("ASCII_Pontos_Guimaraes.txt","r")) != NULL )
>    {
>        while (!feof(fp))
>        {
>            fscanf(fp,"%f %f %f",&fltData1,&fltData2,&fltData3);
>            Points->InsertNextPoint(fltData1,fltData2,fltData3);
>            Points->InsertPoint(numPoints,fltData1,fltData2,fltData3);
>            Vertices->InsertNextCell(1,&numPoints);
>            numPoints++;
>        }
>    }
> 
>    fclose(fp);
> 
>    // Definição da esfera utilizada no Picking para assinalar a célula
> escolhida
>    vtkSphereSource *sphere=vtkSphereSource::New();
>    sphere->SetThetaResolution(8);
>    sphere->SetPhiResolution(8);
>    sphere->SetRadius(5);
>    vtkPolyDataMapper *sphereMapper = vtkPolyDataMapper::New();
>    sphereMapper->SetInput(sphere->GetOutput());
> 
>    // Estabelecimento da esfera como sendo do tipo de actor
>    vtkOpenGLActor *myPicker=vtkOpenGLActor::New();
>    myPicker->GetProperty()->SetColor(1.0,0.0,0.0);
>    myPicker->SetMapper(sphereMapper);
> 
>    // Transfere a informação dos pontos para o array de dados PolyData
>    dataSet->SetPoints(Points);
>    dataSet->SetVerts(Vertices);
>    dataSet->BuildCells();
>    dataSet->BuildLinks();
> 
>    // Mapper and actor
>    vtkPolyDataMapper *polyMapper = vtkPolyDataMapper::New();
>    polyMapper->SetInput(dataSet);
> 
>    vtkActor *polyActor = vtkActor::New();
>    polyActor->SetMapper(polyMapper);
> 
>    // Criaçao do renderer, render window, e interactor.
>    vtkRenderer *ren1 = vtkRenderer::New();
>    vtkRenderWindow *renWin = vtkRenderWindow::New();
>    renWin->AddRenderer(ren1);
> 
>    vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
> 
>    ren1->SetBackground(0,0,0);
>    ren1->AddActor(polyActor);
>        // render
>    //renWin->SetFullScreen(1);
>      // Início da interacção
>    iren->SetRenderWindow(renWin);
>    renWin->SetSize(800,600);
>      /* Definicao de um Cell Picker */
>    vtkCellPicker *picker=vtkCellPicker::New();
>    picker->SetTolerance(0.05);
>    iren->SetPicker(picker);
>    iren->Initialize();
> 
>    // Código de atribuição do Observer
>    vtkMyCallback *callback = vtkMyCallback::New();
>    callback->SetSelectionActor(myPicker);
>    iren->AddObserver(vtkCommand::EndPickEvent, callback);
> 
>    iren->Start();
>      Points->Delete();
>    Vertices->Delete();
>    dataSet->Delete();
>    polyMapper->Delete();
>    polyActor->Delete();
> 
>    return 0;
> }
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-- 
Miguel Angel Rodriguez Florido
Center for Technology in Medicine-ULPGC-Gran Canaria-CanaryIslands,Spain
Emails:marf@{ctm.ulpgc.es,bwh.harvard.edu}-http://www.ctm.ulpgc.es/
Tfnos:+34 928 451253, +34 928 452956 - Fax:+34 928 451243



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