[vtkusers] Create cylinder whose cross section is ellipse

[Bill Lorensen]

Your creation of the polydata was flawed.
This works:
#include "vtkPoints.h"
#include "vtkPolyLine.h"
#include "vtkSmartPointer.h"
#include "vtkLinearExtrusionFilter.h"
#include "vtkDataSetMapper.h"
#include "vtkPolyDataMapper.h"
#include "vtkActor.h"
#include "vtkProperty.h"
#include "vtkCamera.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkInteractorStyleTrackballCamera.h"

int main(int argc, char *argv[])
{

  double angle = 0;
  double r1, r2;
  int id = 0;
  int CenterX, CenterY;
  r1 = 50;
  r2 = 30;

  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  points->SetNumberOfPoints(31);
  while (angle <= 2.0 * vtkMath::Pi() + (vtkMath::Pi() / 60.0))
  {
    points->InsertPoint(id, r1 * cos(angle) + CenterX, r2 * sin(angle) +
                        CenterY, 0);
    angle = angle + (vtkMath::Pi() / 60.0);
    id++;
  }

  vtkSmartPointer<vtkPolyLine> line =
    vtkSmartPointer<vtkPolyLine>::New();
  line->GetPointIds()->SetNumberOfIds(id);
  for(unsigned int i = 0; i < id; i++)
  {
    line->GetPointIds()->SetId(i,i);
  }

  vtkSmartPointer<vtkCellArray> lines =
    vtkSmartPointer<vtkCellArray>::New();
  lines->InsertNextCell(line);

  vtkSmartPointer<vtkPolyData> polyData =
    vtkSmartPointer<vtkPolyData>::New();
  polyData->GlobalReleaseDataFlagOff();
  polyData->Allocate(1, 1);
  polyData->SetPoints(points);
  polyData->SetLines(lines);

  vtkSmartPointer<vtkLinearExtrusionFilter> extrude =
    vtkSmartPointer<vtkLinearExtrusionFilter>::New();
  extrude->SetInputData(polyData);
  extrude->SetExtrusionTypeToNormalExtrusion();
  extrude->SetVector(0, 0, 30.0);
  extrude->SetScaleFactor(0.5);
  extrude->Update();

  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(extrude->GetOutputPort());

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(0.8900, 0.8100, 0.3400);

  vtkSmartPointer<vtkRenderer> ren =
    vtkSmartPointer<vtkRenderer>::New();
  ren->SetBackground(.4, .5, .7);
  ren->AddActor(actor);


  vtkSmartPointer<vtkRenderWindow> renWin =
    vtkSmartPointer<vtkRenderWindow>::New();
  renWin->AddRenderer(ren);
  renWin->SetSize(600, 600);

  vtkSmartPointer<vtkRenderWindowInteractor> iren =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  iren->SetRenderWindow(renWin);

  vtkSmartPointer<vtkInteractorStyleTrackballCamera> style =
    vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();
  iren->SetInteractorStyle(style);

  renWin->Render();
  iren->Initialize();
  iren->Start();

  return EXIT_SUCCESS;
}

On Wed, Jul 26, 2017 at 4:02 AM, arwtyxouymz <arw.tyx-ouy_mz at ezweb.ne.jp> wrote:
> Hi,
>
> I'm a newer of VTK, and use VTK-8.0.0 by C++.
>
> I want to create a cylinder whose cross section is ellipse.
>
> Firstly I create 2d ellipse, then I extrude the ellipse along z axis.
> I could create 2d ellipse, and render it.
> But I have applied vtkLinearExtrusionFilter, my code crash with exit code
> 11.
> What shoud i do?
>
> please help me.
>
> This is my code.
>
> ```
> #include "vtkPoints.h"
> #include "vtkSmartPointer.h"
> #include "vtkLinearExtrusionFilter.h"
> #include "vtkDataSetMapper.h"
> #include "vtkPolyDataMapper.h"
> #include "vtkActor.h"
> #include "vtkProperty.h"
> #include "vtkCamera.h"
> #include "vtkRenderer.h"
> #include "vtkRenderWindow.h"
> #include "vtkRenderWindowInteractor.h"
> #include "vtkInteractorStyleTrackballCamera.h"
>
> int main(int argc, char *argv[])
> {
>
>     double angle = 0;
>     double r1, r2;
>     int id = 0;
>     int CenterX, CenterY;
>     r1 = 50;
>     r2 = 30;
>
>     vtkSmartPointer<vtkPoints> points =
>             vtkSmartPointer<vtkPoints>::New();
>     points->SetNumberOfPoints(31);
>     while (angle <= 2.0 * vtkMath::Pi() + (vtkMath::Pi() / 60.0))
>     {
>         points->InsertPoint(id, r1 * cos(angle) + CenterX, r2 * sin(angle) +
> CenterY, 0);
>         angle = angle + (vtkMath::Pi() / 60.0);
>         id++;
>     }
>
>     vtkSmartPointer<vtkCellArray> lines =
>             vtkSmartPointer<vtkCellArray>::New();
>     lines->Allocate(1, 1);
>     lines->InsertNextCell(id);
>     lines->SetNumberOfCells(id);
>     for (int k = 0; k < id; ++k) {
>         lines->InsertCellPoint(k);
>     }
>
>     vtkSmartPointer<vtkPolyData> polyData =
>             vtkSmartPointer<vtkPolyData>::New();
>     polyData->GlobalReleaseDataFlagOff();
>     polyData->Allocate(1, 1);
>     polyData->SetPoints(points);
>     polyData->SetLines(lines);
>
>     vtkSmartPointer<vtkLinearExtrusionFilter> extrude =
>             vtkSmartPointer<vtkLinearExtrusionFilter>::New();
>     extrude->SetInputData(polyData);
>     extrude->SetExtrusionTypeToNormalExtrusion();
>     extrude->SetVector(0, 0, 30.0);
>     extrude->SetScaleFactor(0.5);
>     extrude->Update();
>
>     vtkSmartPointer<vtkPolyDataMapper> mapper =
>             vtkSmartPointer<vtkPolyDataMapper>::New();
>     mapper->SetInputConnection(extrude->GetOutputPort());
>
>     vtkSmartPointer<vtkActor> actor =
>             vtkSmartPointer<vtkActor>::New();
>     actor->SetMapper(mapper);
>     actor->GetProperty()->SetColor(0.8900, 0.8100, 0.3400);
>
>     vtkSmartPointer<vtkRenderer> ren =
>             vtkSmartPointer<vtkRenderer>::New();
>     ren->SetBackground(.4, .5, .7);
>     ren->AddActor(actor);
>
>
>     vtkSmartPointer<vtkRenderWindow> renWin =
>             vtkSmartPointer<vtkRenderWindow>::New();
>     renWin->AddRenderer(ren);
>     renWin->SetSize(600, 600);
>
>     vtkSmartPointer<vtkRenderWindowInteractor> iren =
>             vtkSmartPointer<vtkRenderWindowInteractor>::New();
>     iren->SetRenderWindow(renWin);
>
>     vtkSmartPointer<vtkInteractorStyleTrackballCamera> style =
>             vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();
>     iren->SetInteractorStyle(style);
>
>     renWin->Render();
>     iren->Initialize();
>     iren->Start();
>
>     return EXIT_SUCCESS;
> }
> ```
>
>
>
> --
> View this message in context: http://vtk.1045678.n5.nabble.com/Create-cylinder-whose-cross-section-is-ellipse-tp5744148.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
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